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MEMORANDUM
Team: Lancer Parking Solutions/ California Baptist University (CBU)
To: Dr. Frederick Pontius/ CBU College of Engineering
From: Manzi Roger Dusabimana
Date: March, 3rd
, 2014
I. Introduction
In the past few years California Baptist University (CBU) has been growing at a
remarkably high rate. This growth is due to the high enrollment rate which goes hands in hands
with the number of the university’s staff and visitors. Having been trained to identify a problem
in the society and use our engineering training to develop solutions, Lancer Parking Solutions
has proposed the construction of a multi-story parking garage, a structure that would enormously
help accommodate the growth of the campus.
From September to December 2013, Team Lancer Parking Solutions has held several
meetings with the client (CBU) during which the site location was chosen, the design capacity
was determined, and the team was set to develop preliminary design plans, a phase completed by
the end of December, 2014. With all necessary resources available, starting from January 2014,
Team Lancer Parking Solutions has been preparing engineering design plans for the project. The
project has been divided into smaller parts and each team member is responsible to carry out the
design for that specific part. Although each team member has their specific assignments, team
members still consult each other since all design portions are interdependent and significantly
connected. Towards the project closing phase, all design parts will be put together to develop a
single comprehensive design deliverable. This document in particular discusses the structural
design phase of the structure as well as the foundation.
Project Site:
After careful evaluation of the available space in the CBU campus and future expansion projects,
team lancer parking solutions with assistance from the CBU’s/ Facilities and Planning
Department the project site was selected. This parking structure will be located on a 3.05 Acre
site located within the CBU campus, between the CBU-recreation center, Diana Avenue, Lancer
Arms, and the future main campus drive located right in front of current facilities department
garage. The project site has a length of 535 ft and a width of 255 ft. The project site is depicted
in Google-Maps snip-shots below.
Proposed Structure
To a large extent, the shape of this structure will be of a parallelepiped composed of five levels.
Each level will have a long span of 530 ft and a short span of 230 ft, series of columns, beams,
shear walls, safety barriers, and ramps. The structure will have a design capacity of over 2200
vehicles, and will be equipped with all necessary installments to make it user-friendly . The
dimensions and components of the structure were chosen to optimize the land use and minimize
the number of levels of the structure, in order to meet the users and clients needs through a safe,
constructible and cost-effective design. The structure will be constructed out of cast-in place
concrete with embedded reinforcement bars, with section properties varying depending on the
member’s expected loading conditions. Cast-in place concrete was selected after deliberate
evaluation of possible structural materials, as depicted in the comparative tables below.
Table 1:
Material Advantage Disadvantage
Cast In Place â—Ź Monolithic
Construction
â—Ź Large Column
Spacing
â—Ź Low Maintenance
Cost
â—Ź High Construction Cost
â—Ź Long Construction Schedule
Pre-Cast â—Ź Quality Controlled
â—Ź Lower Construction
Cost
â—Ź Short Construction
Schedule
â—Ź Failure at Joints
â—Ź Frequent Repair Work
Steel â—Ź Flexible Column
Spacing
â—Ź No Shear Walls
â—Ź Shorter on-site
Construction
â—Ź Lower Construction
Cost
â—Ź Risk of Corrosion
â—Ź Fire Risks
Table 2:
As shown in table 2, Cast-in place came out with the highest grade hence being chosen as the
construction material for project.
Design Criteria:
At the end of the design phase, each structural member as well as the building as a whole will be
designed to bear the live loads( Floor live loads as well as roof live loads), earthquake loads,
wind loads, rain loads as well as the self-weight of the joint members. In developing the
structural model it was highly crucial to follow several design codes and specifications such as
AASHTO, ASCE, ACI, California Building Code, etc. Aside sticking to the available manuals,
in the design. I made sure to develop a facility that will be user-friendly, cost-effective and
constructible as mentioned earlier.
Structural Design Process:
The structural design part of this project was carried out as a systematic and iterative process that
involved (will involve) the following steps:
I. Identification and structural assessment of intended use and occupancy of the
structure
II. Development and structural assessment of architectural plans and layout
III. Estimation and characterization of structural loads
IV. Identification and development of structural framework
V. Analysis of the structure to determine members and connection design forces
VI. Design of structural members and connections
VII. Engineering reasoning the design outcomes
VIII. Inspection and approval by Professional engineers
In this document I will provide detailed discussions on how each step was (will be)carried on.
I. Identification and structural assessment intended use and occupancy of the structure
Throughout several meetings held with the client, CBU represented by Mr.Steve Smith, Mr. …..
I was able to develop a clear understanding on the use and occupancy of this structure from a
structural designer’s point of view. As mentioned earlier, the structure will be used to
accommodate 2200 vehicles of visitors, students, staff and faculty. The primarily objects in this
structure will be vehicles (Passenger cars, and buses on the first level), bikes, elevators, air
conditioning and electric equipments, as well as marketing panels. This information helped
predict various type of loadings, with a huge proportion categorized as both dynamic and static,
which lead to the use of both the AASHTO and ASCE design codes. These manuals and
information provide assistance in developing a model for a structure that will ensure the safety
and serviceability of the structure, i.e., designing the structure to carry the loads safely.
II. Development and structural assessment of architectural plans and layout
A collaborative effort with the lead-architect, Miss. Alejandra Gastellum, deep analysis of the
architectural plans were carried out, for a design that is structural feasible, cost-effective and
constructable. In charge of the structural design, I proposed several modification to the original
architectural plans in order to minimize structural components that would result into wasteful
expenses during the construction phase. Additionally, ASCE-7, and AASHTO codes were used
to select ramp slopes, maximum distance between columns (span length), minimum height
clearances,etc.
Below is a summary of the conclusion from the analysis of architectural plans:
â—Ź The structure was decided to be of a parallelepipedal shape.
â—Ź The structural will be largely symmetric,
â—Ź XXXXX Longitudinal bays,
â—Ź One ramp per level (level 1, level 2, level 3, level 3, level 4)
â—Ź Open top-on the 5 level
â—Ź A structural wall at least up to the third level on Diana Avenue
â—Ź Agreements on dimensions ranges of structural members (Details in forthcoming
sections)
(For additional architectural details consult Ms. Alejandra Gastelum).
III. Estimation and characterization of structural loads
Meetings with Mr. Suhail Farah and Miss. Danielle Lynch helped me obtain detailed and
relevant information about the possible loading conditions of the structure. Throughout the
discussions five categories of possible critical loads were developed.
- Live Loads:
Also called imposed loads, include all temporary and moving loads on the structure. In the
structural analysis/ design process, these loads will involve considerations such as impact,
momentum,, vibration, fatigue, etc. Below is a table that describes the live loads input used in the
structural analysis.
Table 3.
LIve load per floor 6623400 lb/floor Units
Surface Pressure PsF SAP 2000
5th level 7198.26113207547 50 PsF
4th level 14396.5222641509 100 PsF
3rd Level 21594.7833962264 150 PsF
2nd Level 28793.0445283019 200 PsF
1 st Level 35991.3056603774 250 PsF
- Dead Loads:
This category includes all loads that are relatively consistent over time. These also include the
weight of the structure itself, and all immovable fixture such as architectural adds-on ( Walls,
plasterboard, etc.). Due to the type of possible dead loads,in the design most of the dead loads
will estimated by linking them to the density and quantity of the construction materials.These are
usually considered as gravity loads in structural design.
- Wind Loads:
These are due to the action of wind on the exterior of the building. In the structural design these
loads were considered responsible for possible lateral movements of the structure. Additionally,
in the design process I kept in mind that when wind passes over relatively flat surfaces, it applies
an upward load or suction, a phenomenon that is likely to occur on each level of this parking
structure. Wind loads are usually in form of pressure or suction on the exterior surfaces of the
building. Below is a table that describes the wind loads input used in the structural analysis.
Wind Loads Loads per Side(lb) SAP 2000-Inputs Unit
Lancer-Arms(WindWard) 347271.51 377.412056150943 PSF
Rec-Center(LeeWard) 216265.34 235.035539320755 PSF
Diana Ave(SideB) 141686.55 153.983873207547 PSF
Main Campus (Side A) -141686.55 -153.983873207547 PSF
- Rain Loads:
As recommended by ASCE 7-02, section 10, each section of the roof will be designed to sustain
the load of all rainwater that will accumulate on it if the primary drainage system of that portion
is blocked plus the uniform load caused by the water that rise above the inlet of the secondary
drainage system at its design flow. These recommendations were/will be taken into consideration
in the design of this parking structure. Rain loads will be applied as a distributed gravity load
which typically causes the structural members to go under bending moments, shear forces, and
axial forces.
-Earthquake/Seismic Loads:
These loads result from rupture of prestressed tectonic plates, which generally manifest in rapid
movements or vibration of structures. In the structural design the earthquake loads were
characterized dynamic, and variant with the height of the structure. The effect of these loads can
be controlled by appropriate foundation design, structural stiffness, and the type of connections
used in the structure. This parking structure will be designed to resist the horizontal component
of the earthquake loads since there are generally weaker vertically in our region.
Earthaquake Loads
Loads per floor(lb) SAP 2000 unit
5th level 3274699.061 24.7147098943396 PsF
4th level 2240077.644 16.9062463698113 PsF
3rd Level 1522775.683 11.4926466641509 PsF
2nd Level 835656.912 6.30684461886792 PsF
1 st Level 0 PsF
Earthquake forces in Y-Direction Earthquake forces in X-Direction
IV. Identification and development of structural framework
This is a critical stage for the entire project. It is a process that must be both creative and
technical process, and requires fundamental knowledge of material properties and mechanics,
knowledge of various types of structural forms and configurations, as well as familiarity with
modeling computer softwares...AutoCAD 3D was used in this project. In order to carry out this
process, architectural plans were carefully analyzed to best understand the potential placements
of structural members. My expertise developed through engineering training from the Structural
Design class offered by Dr. Jong-Wha Bai at CBU, data from local parking structures and
insights from various practising engineers assisted me in developing a structural frame that will
be both cost-efficient for the owner, structurally safe for the users and easy to construct for the
contractor.
As mentioned earlier, the architectural plans proposed a parallelepipedal shape for the parking
structure. Using the structural expertise this rectangular solid was translated into structural model
composed of series of columns and beams, shear walls, slabs, and ramps all joined together, and
the whole assembly sits on a foundation. At every stage of developing the frame, the structural
designer had several options to chose from, and engineering judgement was used to pick the
most practical option. The selected/developed structural frame included moment resisting
frames, braced frames, dual frames, shear wall frames, and so on.
In the design my intentions were to develop a structure that will be user-friendly and that will
best accommodate the clients needs while meeting the recommended building codes and
standards. Hence, all viable material & framing plan alternatives were considered and designed
to compare individual material and fabrication/erection costs and the most efficient economical
framing system was selected. The following dimensioning characteristics were selected as
tentative using engineering judgement, however, they are susceptible to chances and will later be
calibrated to best meet the project’s specifications for the design deliverables.
- Longitudinal Bays (Magnolia-Indiana):
* Number of bays:
* Distance between Columns
* Number of slabs/levels:
* Number of Entrances:
* Number of Shear Walls
- Latitudinal Bays: ( Adams-Monroe)
* Number of bays:
* Distance between Columns
* Number of slabs/levels:
* Number of Entrances:
* Number of Shear Walls
-Level 1:
* Foundation Dimensions
* Level Max Height
* Number of columns
* Number of beams
* Shear Walls
-Level 2, Level 3, Level 4
* Slab Thickness Dimensions
* Level Max Height
* Number of columns
* Number of beams
* Shear walls
-Level 5:
* Slab Thickness Dimensions
* Level Max Height
* Number of columns
* Number of beams
* Shear walls
-Ramps (Tentative ):
* Dimensions
* Location:
* Material Properties
-Beam/Flexural members (Tentative ):
* Dimensions:
* Material Properties:
* Reinforcement:
-Column/Compression members (Tentative ):
* Dimension
* Material Properties
* Reinforcement:
- Shear Walls (Tentative ):
* Dimension
* Material Properties
* Number and location
-Foundation (Tentative):
â—Ź Soil Bearing Capacity
â—Ź Earthquake resistivity of the soil
â—Ź Underground utilities
â—Ź Design dimension selection
â—Ź Calculations/design procedure:
â—Ź Pictures from the DESIGN CODES
â—Ź Design Sectional Dimensions ( input)
â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected)
-Connections/Joint restraints:
* Beam-Columns
* Column-foundation
V. Analysis of the structure to determine members and connection design forces
* The structural analysis and design will be done using SAP 2000, a three dimensional based
structural engineering tool.
Description of the SAP2000
SAP2000 is a general purpose finite element program which performs the static or dynamic,
linear or nonlinear analysis of structural systems. It is a powerful design tool to design structures
following AASHTO specifications, ACI and AISC building codes. These features, and many
more make SAP2000 the state-of-the-art in structural analysis program, thus our choice to use
this program in the structural design of this project. SAP2000 will be used to model, analyze,
design, and display the structure geometry, properties and analysis results. Although the outputs
of this software are highly reliable/accurate, additional hand computations will be performed to
evaluate the accuracy of SAP2000 analyses and designs
The structural analysis/design process will be carried on in three phases:
1. Preprocessing.
2. Solving.
3. Postprocessing
Part I. Preprocessing.
In preprocessing, engineering judgement was used to make choices regarding the following
information which is needed by SAP2000.
1. Choosing the units for this project: We chose to use the US Customary Units [
Pounds, Feet, Seconds]
2. Setting up the structure’s geometry: This step was carried on by importing the
3D structural frame developed using AutoCAD 3D as described in the previous
section.
3. Defining material and member section properties: As mentioned earlier, the
building will be developed using cast-in place reinforced concrete. The tentative
member section properties were chosen as results of the structural designer’s
expertise, data from local parking structures, and suggestions from various
professional engineers such as T & B Engineering, Inc.
4. Assigning member section properties and element releases.: This was directly
done through SAP2000 graphic user interface as described in the snapshots
below:
5. Defining load cases: As discussed earlier, we will have two types of loading
conditions acting on this structure: Static loads and dynamic loads. The estimated
types of loadings were combined in the following several different cases of load
combinations. This step was completed done directly through SAP2000 graphic
user interface as described in the snapshots below:
6. Assigning load magnitudes.: This step was completed directly through SAP2000
graphic user interface as described in the snapshots below. The loads used in this
process are those previously discussed in section III.
7. Assigning restraints: this step was completed done directly through SAP2000
graphic user interface as described in the snapshots below. The structural engineer
chose……… restraints,a commonly used type of joints in cast-in place concrete.
From experience, I found out that it is very important to assign restraints to the
structural model otherwise your structure will become unstable or it becomes
a free body and it cannot be solved by SAP2000.
PART II. Solving
During this phase SAP2000 will assemble and solve the global matrix. The following steps are
needed: Below is a step-by-step description of interactions with SAP2000 performed to carry on
this process.
1. From the Analysis menu, Set Option was selected… This displayed the Analysis Option
dialog box.
2. In this dialog box, the appropriate DOF was selected, and then clicked OK.
3. From the analysis menu, I select Run. The Save Model File As dialog box was then
displayed to allow saving the file.
4. After specifying where the file should be saved, the analysis began. A top window was
opened in which the various phases of analysis process are progressively reported. When
the analysis is complete, the screen will display the message "ANALYSIS COMPLETE".
Below is the description of this process through Snapshots.
PART III. Postprocessing.
In this phase of structural analysis and design, SAP2000 will help provide the following
details/options:
1. Displaying the deformed shape of the structural model under the assigned loading
conditions.
2. Displaying the forces in each structural member:
3. Printouts of the analysis and design results.
4. Designing the structural members and checking the safety of a design.
5. Modifying the structure.
Briefly, after the analysis is complete, SAP2000 automatically displays the deformed shape of
the model for the default load case, LOAD1, in the active display window. The double view
windows in SAP2000 enables us to display the deformed shape for two load cases, which allows
to make comparative analysis. The display of the deformed shape provides details such as the
member force diagram box by selecting the component being analyzed...i.e. by moving the
cursor to a specific location we can read the values of the forces at that point. As mentioned
earlier, SAP2000 can use the analysis results to design appropriate structural members. SAP2000
is equipped with information about the updated codes and specification, these can/will be used to
check the safety level of the structure. In fact, SAP2000 will suggest various design options for
the structural members properties, and engineering judgement will be used to select the most
appropriate design to meet the previously discussed design criteria.
VIII. Foundation:
â—Ź Soil investigation:
â—‹ Soil Bearing Capacity
â—‹ Earthquake resistivity of the soil
â—‹ Underground utilities
â—Ź Design dimension selection
â—Ź Calculations/design procedure:
â—Ź Pictures from the DESIGN CODES
â—Ź Design Sectional Dimensions ( input)
â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected)
IX. Deliverables:
â—Ź Detailed Construction drawings of typical beam
â—Ź Detailed Construction drawings of typical column
â—Ź Detailed Construction drawings of typical slab section
â—Ź Detailed construction drawings of typical ramp section
Conclusion:
● Reintroduce the project’s objective
â—Ź Discuss the challenges encountered
â—Ź What recommendations?
â—Ź What did I learn?
V. Defining load cases.
Now, it is time to give SAP2000 the applied load’s information. The steps are:
1. From Define menu, choose Static load cases… This will display the define load
case dialog box.
2. This dialog box will display the default load, LOAD1, with type set to Dead, and
self-weight multiplier set to unity. This will automatically include the self-weight
of structural members in the analysis based on preset specific weights given in
function of the material type. We don’t have to change anything for this first load
case. But if you wish to enter the weight by your self and put it as joint load, or if
you went to ignore the offset of the dead weight, then you should change the self-
weight multiplier to 0 to avoid count the self weight twice.
3. Define additional load cases, change the LOAD1 to LOAD2 (or the case you
defined), select load type from the Type drop-down list box, change the self-
weight multiplier to appropriate number. In most times, you change the self-
weight multiplier to 0 because dead load already count dead load in LOAD1).
Then click on the Add new Load button to notify SAP2000. Repeat this step until
you define all the load cases.
4. Finally, click OK to back to main window.
In the following section of assigning joint load cases, you must assign a numerical volume and
the location of each joint loads for every load cases.
VI. Assigning loads.
For simplicity, we just talk about assigning joint loads. If you wish to apply a distributed load on
a member, you can refer to SAP2000 manual for detail. To assign joint loads execute the
following steps:
1. Select the joints which have the same joint loads. You can use one of the three
selection methods used previously to select members.
2. From the Assign menu, choose Joint Static Loads, then Forces… from the
submenu. This will display the Joint forces dialog box.
3. In this dialog box, accept the default load case name as LOAD1, enter the
corresponding joint force components in the Load area. Click OK to accept the
above joint loads.
4. Repeat steps a, b and c until you assign all the joint loads of this load case defined
to this structure.
5. Repeat steps a, b, c and d until you finish every load case’s load assignment.
VII. Assigning restraints.
It is very important to assign restraints to your structure. Otherwise your structure will become
unstable or it becomes a free body and it cannot be solved by SAP2000. Applying joint restraints
requires the following steps:
1. Click the Pointer Tool button ( i.e. ) in the Floating Toolbar.
2. Click the joints which have the same restraints.
3. From the Assign menu, choose the Jointà Restraints… from the submenu. This
will display the joint restraint dialog box.
4. In this dialog box, choose appropriate restraint parameter. Then click OK to
accept this assignment.
5. Repeat steps a, b, c and d until you finish the restraint assignment.
PART II. SolvingIn this part SAP2000 will assemble and solve the global matrix. The following
steps are needed:
5. From the Analysis menu, select Set Option… This will display the Analysis Option
dialog box.
6. In this dialog box, check the available DOF. If you are analyzing a plane truss, check UX
and UY, leave the UZ, RX, RY and RZ blank.
7. Click OK to accept what you choose.
8. From the analysis menu, select Run. This will display the Save Model File As dialog
box.
9. In this dialog box, save the model under a filename. No extension is necessary.
10. Click the OK button, the analysis will begin. A top window is opened in which the
various phases of analysis process are progressively reported. When the analysis is
complete, the screen will display the message "ANALYSIS COMPLETE".
11. Click OK button in the top window to close it.
PART III. Postprocessing.
The main options in post processing are:
6. Displaying the deformed shape.
7. Displaying the member forces.
8. Printing the results.
9. Designing the structural members and checking the safety of a design.
10. Modifying the structure.
For simplicity, we just discuss the three fundamental options: displaying the deformed shape,
displaying the member forces and printing results here.
1. Displaying the deformed shape.
After the analysis is complete, SAP2000 automatically displays the deformed shape of the model
for the default load case, LOAD1, in the active display window. We can now display the
deformed shape for another load case in one of the two view windows.
1. Activate one of the two view windows by clicking anywhere inside that window.
2. Click the display deformed shape button on the floating toolbar. This will display the
deformed shape dialog box.
3. In the drop down list in the load area of this dialog box, select the load case to be
displayed, then click OK button. The deformed shape will show.
1. Displaying the member forces.
1. From the Display menu, click the Show element forces/stressesĂ  frames, this will
display the member force diagram dialog box.
2. In this dialog box, select the component which need to display (for truss, choose Axial
force) in the Component area, and click OK button. The axial force diagram for the
entire truss is displayed. By moving cursor to a specific location, we can read the values
of the force at that point.
1. Printing the results.
1. From File menu, select Print Output Table… In the display dialog box, click OK to
accept the default setting. The detailed output results will be printed.
2. From File menu, select Print Input Table… In the display dialog box, click OK to
accept the default setting. The detailed input information will be printed.
You can also get the detailed results in another way. When we analyze a structure, by default,
SAP2000 will create three output files: filename.out, filename.log and filename.EKO. The output
file filename.out stores the output of your analysis. The output file filename.EKO stores the input
information for this structure. The output file filename.log take all of the running information.
These files are text files. You can print these files using computer operating system. For
example, we can print these files from Notepad. The steps are:
1. Open Notepad by double click the Notepad icon on the main window.
2. From File menu, choose Open. This will display a standard Microsoft file
selection dialog box.
3. In this dialog box, choose the drive and subdirectory where your file is located.
4. Click on the file name you want to display and print. (i. e. any one of
filename.out, filename.EKO, or filename.log.)
5. Click OK to terminate this dialog box. Your file will display by Notepad.
6. Review the file to make sure your results are correct.
7. From File menu, choose print… This will display the print dialog box.
8. Click OK to accept the default print setting. Your file will print on background.
9. Repeat steps b, c, d, e, f, g and h to print another file.
10. Close Notepad by choosing Exit from the File menu.
â—‹ INPUTS:
â–  structural frame model
â–  loads
â—‹ OUTPUTS:
â– 
â—Ź LOADS:
â—‹ Load Combinations:
â—‹ Load assignment:
â–  Live loads
â–  Dead Loads
â–  Earthquake Loads
â–  Rain Loads
â–  Wind Loads
â—Ź OUTPUTS:
â—‹ Moments
â—‹ Axial Forces
â—‹ Lateral Forces:
â—Ź SELECTION OF APPROPRIATE DESIGN OPTION
â—‹ Design for Strength
â—‹ Design for Constructability
â—‹ Design for a reasonable price
â—Ź DEVELOPMENT OF CONSTRUCTION DRAWINGS
Critical Design Parts:
I. Columns:
â—Ź The parking structure will have three series of columns. The exterior columns, the inner
columns, and the ram bearing columns. Based on ASCE-7, section XXXXX every
section of long span will be composed of __(# of columns)_Columns. This number was
determined by dividing the span length and the assumed column spacing of XXXXXX
with is equivalent to three parking spots. For design purposes, each column was assumed
to be of XX ft by XXXX ft. These dimensions were picked based on ACI
recommendations as well as observation data from several parking structures visited
around in Southern California. Each of these columns will be made out of cast-in place
concrete, reinforced with steel rebars as mentioned earlier. Further down, a discussion
will be given on how the appropriate design column size; reinforcement bars’ size,
number, placement; concrete’s properties, as well as other design options are developed
and selected. As mentioned earlier, the structure will be composed of 5 levels. The
columns sections in first level will have a height of XXX ft. This design height was
selected based on AASHTO minimum clearance for emergency vehicles, buses and
handicap vehicles that will be housed in the first level of the structure. Columns sections
in the second, third, and fourth floor will have a height of XXX ft... The columns sections
the fifth floor were designed to have a height of XXX ft ...
â—Ź Columns design procedure
â—Ź Calculations
â—Ź Pictures from the DESIGN CODES
â—Ź Design Sectional Dimensions ( input)
â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected)
II. Beams:
â—Ź Design dimension selection
â—Ź Beam design procedure
â—Ź Calculations:
â—Ź Pictures from the DESIGN CODES
â—Ź Design Sectional Dimensions sketch ( input)
â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected)
III. Connections:
â—Ź Type of connections ( why they were chosen)
â—Ź Design in SAP2000
â—Ź Connection design equations
IV. Slabs:
â—Ź Design dimension selection
â—Ź slab design procedure
â—Ź Calculations:
â—Ź Pictures from the DESIGN CODES
â—Ź Design Sectional Dimensions ( input)
â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected)
V. Ramps:
â—Ź Design dimension selection
â—Ź slab design procedure
â—Ź Calculations:
â—Ź Pictures from the DESIGN CODES
â—Ź Design Sectional Dimensions ( input)
â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected)
VI. Stairs:
â—Ź Design dimension selection/how manny?
â—Ź Beam design procedure Calculations:
â—Ź Pictures from the DESIGN CODES
â—Ź Design Sectional Dimensions ( input)
â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected)
VII. Shear Walls
â—Ź Design dimension selection
â—Ź Calculations/ Design procedure
â—Ź Pictures from the DESIGN CODES
â—Ź Design Sectional Dimensions ( input)
â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected)
VIII. Foundation:
â—Ź Soil investigation:
â—‹ Soil Bearing Capacity
â—‹ Earthquake resistivity of the soil
â—‹ Underground utilities
â—Ź Design dimension selection
â—Ź Calculations/design procedure:
â—Ź Pictures from the DESIGN CODES
â—Ź Design Sectional Dimensions ( input)
â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected)
IX. Deliverables:
â—Ź Detailed Construction drawings of typical beam
â—Ź Detailed Construction drawings of typical column
â—Ź Detailed Construction drawings of typical slab section
â—Ź Detailed construction drawings of typical ramp section
Conclusion:
● Reintroduce the project’s objective
â—Ź Discuss the challenges encountered
â—Ź What recommendations?
â—Ź What did I learn?
Technical memorandum -Senior Capstone Project

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Technical memorandum -Senior Capstone Project

  • 1. MEMORANDUM Team: Lancer Parking Solutions/ California Baptist University (CBU) To: Dr. Frederick Pontius/ CBU College of Engineering From: Manzi Roger Dusabimana Date: March, 3rd , 2014 I. Introduction In the past few years California Baptist University (CBU) has been growing at a remarkably high rate. This growth is due to the high enrollment rate which goes hands in hands with the number of the university’s staff and visitors. Having been trained to identify a problem in the society and use our engineering training to develop solutions, Lancer Parking Solutions has proposed the construction of a multi-story parking garage, a structure that would enormously help accommodate the growth of the campus. From September to December 2013, Team Lancer Parking Solutions has held several meetings with the client (CBU) during which the site location was chosen, the design capacity was determined, and the team was set to develop preliminary design plans, a phase completed by the end of December, 2014. With all necessary resources available, starting from January 2014, Team Lancer Parking Solutions has been preparing engineering design plans for the project. The project has been divided into smaller parts and each team member is responsible to carry out the design for that specific part. Although each team member has their specific assignments, team members still consult each other since all design portions are interdependent and significantly connected. Towards the project closing phase, all design parts will be put together to develop a single comprehensive design deliverable. This document in particular discusses the structural design phase of the structure as well as the foundation.
  • 2. Project Site: After careful evaluation of the available space in the CBU campus and future expansion projects, team lancer parking solutions with assistance from the CBU’s/ Facilities and Planning Department the project site was selected. This parking structure will be located on a 3.05 Acre site located within the CBU campus, between the CBU-recreation center, Diana Avenue, Lancer Arms, and the future main campus drive located right in front of current facilities department garage. The project site has a length of 535 ft and a width of 255 ft. The project site is depicted in Google-Maps snip-shots below. Proposed Structure
  • 3. To a large extent, the shape of this structure will be of a parallelepiped composed of five levels. Each level will have a long span of 530 ft and a short span of 230 ft, series of columns, beams, shear walls, safety barriers, and ramps. The structure will have a design capacity of over 2200 vehicles, and will be equipped with all necessary installments to make it user-friendly . The dimensions and components of the structure were chosen to optimize the land use and minimize the number of levels of the structure, in order to meet the users and clients needs through a safe, constructible and cost-effective design. The structure will be constructed out of cast-in place concrete with embedded reinforcement bars, with section properties varying depending on the member’s expected loading conditions. Cast-in place concrete was selected after deliberate evaluation of possible structural materials, as depicted in the comparative tables below. Table 1: Material Advantage Disadvantage Cast In Place â—Ź Monolithic Construction â—Ź Large Column Spacing â—Ź Low Maintenance Cost â—Ź High Construction Cost â—Ź Long Construction Schedule Pre-Cast â—Ź Quality Controlled â—Ź Lower Construction Cost â—Ź Short Construction Schedule â—Ź Failure at Joints â—Ź Frequent Repair Work Steel â—Ź Flexible Column Spacing â—Ź No Shear Walls â—Ź Shorter on-site Construction â—Ź Lower Construction Cost â—Ź Risk of Corrosion â—Ź Fire Risks
  • 4. Table 2: As shown in table 2, Cast-in place came out with the highest grade hence being chosen as the construction material for project. Design Criteria: At the end of the design phase, each structural member as well as the building as a whole will be designed to bear the live loads( Floor live loads as well as roof live loads), earthquake loads, wind loads, rain loads as well as the self-weight of the joint members. In developing the structural model it was highly crucial to follow several design codes and specifications such as
  • 5. AASHTO, ASCE, ACI, California Building Code, etc. Aside sticking to the available manuals, in the design. I made sure to develop a facility that will be user-friendly, cost-effective and constructible as mentioned earlier. Structural Design Process: The structural design part of this project was carried out as a systematic and iterative process that involved (will involve) the following steps: I. Identification and structural assessment of intended use and occupancy of the structure II. Development and structural assessment of architectural plans and layout III. Estimation and characterization of structural loads IV. Identification and development of structural framework V. Analysis of the structure to determine members and connection design forces VI. Design of structural members and connections VII. Engineering reasoning the design outcomes VIII. Inspection and approval by Professional engineers In this document I will provide detailed discussions on how each step was (will be)carried on. I. Identification and structural assessment intended use and occupancy of the structure Throughout several meetings held with the client, CBU represented by Mr.Steve Smith, Mr. ….. I was able to develop a clear understanding on the use and occupancy of this structure from a structural designer’s point of view. As mentioned earlier, the structure will be used to accommodate 2200 vehicles of visitors, students, staff and faculty. The primarily objects in this
  • 6. structure will be vehicles (Passenger cars, and buses on the first level), bikes, elevators, air conditioning and electric equipments, as well as marketing panels. This information helped predict various type of loadings, with a huge proportion categorized as both dynamic and static, which lead to the use of both the AASHTO and ASCE design codes. These manuals and information provide assistance in developing a model for a structure that will ensure the safety and serviceability of the structure, i.e., designing the structure to carry the loads safely. II. Development and structural assessment of architectural plans and layout A collaborative effort with the lead-architect, Miss. Alejandra Gastellum, deep analysis of the architectural plans were carried out, for a design that is structural feasible, cost-effective and constructable. In charge of the structural design, I proposed several modification to the original architectural plans in order to minimize structural components that would result into wasteful expenses during the construction phase. Additionally, ASCE-7, and AASHTO codes were used to select ramp slopes, maximum distance between columns (span length), minimum height clearances,etc. Below is a summary of the conclusion from the analysis of architectural plans: â—Ź The structure was decided to be of a parallelepipedal shape. â—Ź The structural will be largely symmetric, â—Ź XXXXX Longitudinal bays, â—Ź One ramp per level (level 1, level 2, level 3, level 3, level 4) â—Ź Open top-on the 5 level â—Ź A structural wall at least up to the third level on Diana Avenue â—Ź Agreements on dimensions ranges of structural members (Details in forthcoming sections)
  • 7. (For additional architectural details consult Ms. Alejandra Gastelum). III. Estimation and characterization of structural loads Meetings with Mr. Suhail Farah and Miss. Danielle Lynch helped me obtain detailed and relevant information about the possible loading conditions of the structure. Throughout the discussions five categories of possible critical loads were developed. - Live Loads: Also called imposed loads, include all temporary and moving loads on the structure. In the structural analysis/ design process, these loads will involve considerations such as impact, momentum,, vibration, fatigue, etc. Below is a table that describes the live loads input used in the structural analysis. Table 3. LIve load per floor 6623400 lb/floor Units Surface Pressure PsF SAP 2000 5th level 7198.26113207547 50 PsF 4th level 14396.5222641509 100 PsF 3rd Level 21594.7833962264 150 PsF 2nd Level 28793.0445283019 200 PsF 1 st Level 35991.3056603774 250 PsF - Dead Loads: This category includes all loads that are relatively consistent over time. These also include the weight of the structure itself, and all immovable fixture such as architectural adds-on ( Walls, plasterboard, etc.). Due to the type of possible dead loads,in the design most of the dead loads will estimated by linking them to the density and quantity of the construction materials.These are usually considered as gravity loads in structural design. - Wind Loads: These are due to the action of wind on the exterior of the building. In the structural design these
  • 8. loads were considered responsible for possible lateral movements of the structure. Additionally, in the design process I kept in mind that when wind passes over relatively flat surfaces, it applies an upward load or suction, a phenomenon that is likely to occur on each level of this parking structure. Wind loads are usually in form of pressure or suction on the exterior surfaces of the building. Below is a table that describes the wind loads input used in the structural analysis. Wind Loads Loads per Side(lb) SAP 2000-Inputs Unit Lancer-Arms(WindWard) 347271.51 377.412056150943 PSF Rec-Center(LeeWard) 216265.34 235.035539320755 PSF Diana Ave(SideB) 141686.55 153.983873207547 PSF Main Campus (Side A) -141686.55 -153.983873207547 PSF - Rain Loads: As recommended by ASCE 7-02, section 10, each section of the roof will be designed to sustain the load of all rainwater that will accumulate on it if the primary drainage system of that portion is blocked plus the uniform load caused by the water that rise above the inlet of the secondary drainage system at its design flow. These recommendations were/will be taken into consideration in the design of this parking structure. Rain loads will be applied as a distributed gravity load which typically causes the structural members to go under bending moments, shear forces, and axial forces. -Earthquake/Seismic Loads: These loads result from rupture of prestressed tectonic plates, which generally manifest in rapid movements or vibration of structures. In the structural design the earthquake loads were characterized dynamic, and variant with the height of the structure. The effect of these loads can be controlled by appropriate foundation design, structural stiffness, and the type of connections used in the structure. This parking structure will be designed to resist the horizontal component of the earthquake loads since there are generally weaker vertically in our region.
  • 9. Earthaquake Loads Loads per floor(lb) SAP 2000 unit 5th level 3274699.061 24.7147098943396 PsF 4th level 2240077.644 16.9062463698113 PsF 3rd Level 1522775.683 11.4926466641509 PsF 2nd Level 835656.912 6.30684461886792 PsF 1 st Level 0 PsF Earthquake forces in Y-Direction Earthquake forces in X-Direction IV. Identification and development of structural framework This is a critical stage for the entire project. It is a process that must be both creative and technical process, and requires fundamental knowledge of material properties and mechanics, knowledge of various types of structural forms and configurations, as well as familiarity with modeling computer softwares...AutoCAD 3D was used in this project. In order to carry out this process, architectural plans were carefully analyzed to best understand the potential placements of structural members. My expertise developed through engineering training from the Structural Design class offered by Dr. Jong-Wha Bai at CBU, data from local parking structures and
  • 10. insights from various practising engineers assisted me in developing a structural frame that will be both cost-efficient for the owner, structurally safe for the users and easy to construct for the contractor. As mentioned earlier, the architectural plans proposed a parallelepipedal shape for the parking structure. Using the structural expertise this rectangular solid was translated into structural model composed of series of columns and beams, shear walls, slabs, and ramps all joined together, and the whole assembly sits on a foundation. At every stage of developing the frame, the structural designer had several options to chose from, and engineering judgement was used to pick the most practical option. The selected/developed structural frame included moment resisting frames, braced frames, dual frames, shear wall frames, and so on. In the design my intentions were to develop a structure that will be user-friendly and that will best accommodate the clients needs while meeting the recommended building codes and standards. Hence, all viable material & framing plan alternatives were considered and designed to compare individual material and fabrication/erection costs and the most efficient economical framing system was selected. The following dimensioning characteristics were selected as tentative using engineering judgement, however, they are susceptible to chances and will later be calibrated to best meet the project’s specifications for the design deliverables. - Longitudinal Bays (Magnolia-Indiana): * Number of bays: * Distance between Columns * Number of slabs/levels: * Number of Entrances: * Number of Shear Walls
  • 11. - Latitudinal Bays: ( Adams-Monroe) * Number of bays: * Distance between Columns * Number of slabs/levels: * Number of Entrances: * Number of Shear Walls -Level 1: * Foundation Dimensions * Level Max Height * Number of columns * Number of beams * Shear Walls -Level 2, Level 3, Level 4 * Slab Thickness Dimensions * Level Max Height * Number of columns * Number of beams * Shear walls -Level 5: * Slab Thickness Dimensions * Level Max Height * Number of columns * Number of beams
  • 12. * Shear walls -Ramps (Tentative ): * Dimensions * Location: * Material Properties -Beam/Flexural members (Tentative ): * Dimensions: * Material Properties: * Reinforcement: -Column/Compression members (Tentative ): * Dimension * Material Properties * Reinforcement: - Shear Walls (Tentative ): * Dimension * Material Properties * Number and location -Foundation (Tentative): â—Ź Soil Bearing Capacity â—Ź Earthquake resistivity of the soil â—Ź Underground utilities â—Ź Design dimension selection â—Ź Calculations/design procedure:
  • 13. â—Ź Pictures from the DESIGN CODES â—Ź Design Sectional Dimensions ( input) â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected) -Connections/Joint restraints: * Beam-Columns * Column-foundation V. Analysis of the structure to determine members and connection design forces * The structural analysis and design will be done using SAP 2000, a three dimensional based structural engineering tool. Description of the SAP2000 SAP2000 is a general purpose finite element program which performs the static or dynamic, linear or nonlinear analysis of structural systems. It is a powerful design tool to design structures following AASHTO specifications, ACI and AISC building codes. These features, and many more make SAP2000 the state-of-the-art in structural analysis program, thus our choice to use this program in the structural design of this project. SAP2000 will be used to model, analyze, design, and display the structure geometry, properties and analysis results. Although the outputs of this software are highly reliable/accurate, additional hand computations will be performed to evaluate the accuracy of SAP2000 analyses and designs The structural analysis/design process will be carried on in three phases: 1. Preprocessing. 2. Solving. 3. Postprocessing Part I. Preprocessing.
  • 14. In preprocessing, engineering judgement was used to make choices regarding the following information which is needed by SAP2000. 1. Choosing the units for this project: We chose to use the US Customary Units [ Pounds, Feet, Seconds] 2. Setting up the structure’s geometry: This step was carried on by importing the 3D structural frame developed using AutoCAD 3D as described in the previous section. 3. Defining material and member section properties: As mentioned earlier, the building will be developed using cast-in place reinforced concrete. The tentative member section properties were chosen as results of the structural designer’s expertise, data from local parking structures, and suggestions from various professional engineers such as T & B Engineering, Inc. 4. Assigning member section properties and element releases.: This was directly done through SAP2000 graphic user interface as described in the snapshots below: 5. Defining load cases: As discussed earlier, we will have two types of loading conditions acting on this structure: Static loads and dynamic loads. The estimated types of loadings were combined in the following several different cases of load combinations. This step was completed done directly through SAP2000 graphic user interface as described in the snapshots below: 6. Assigning load magnitudes.: This step was completed directly through SAP2000 graphic user interface as described in the snapshots below. The loads used in this process are those previously discussed in section III.
  • 15. 7. Assigning restraints: this step was completed done directly through SAP2000 graphic user interface as described in the snapshots below. The structural engineer chose……… restraints,a commonly used type of joints in cast-in place concrete. From experience, I found out that it is very important to assign restraints to the structural model otherwise your structure will become unstable or it becomes a free body and it cannot be solved by SAP2000. PART II. Solving During this phase SAP2000 will assemble and solve the global matrix. The following steps are needed: Below is a step-by-step description of interactions with SAP2000 performed to carry on this process. 1. From the Analysis menu, Set Option was selected… This displayed the Analysis Option dialog box. 2. In this dialog box, the appropriate DOF was selected, and then clicked OK. 3. From the analysis menu, I select Run. The Save Model File As dialog box was then displayed to allow saving the file. 4. After specifying where the file should be saved, the analysis began. A top window was opened in which the various phases of analysis process are progressively reported. When the analysis is complete, the screen will display the message "ANALYSIS COMPLETE". Below is the description of this process through Snapshots. PART III. Postprocessing. In this phase of structural analysis and design, SAP2000 will help provide the following details/options: 1. Displaying the deformed shape of the structural model under the assigned loading
  • 16. conditions. 2. Displaying the forces in each structural member: 3. Printouts of the analysis and design results. 4. Designing the structural members and checking the safety of a design. 5. Modifying the structure. Briefly, after the analysis is complete, SAP2000 automatically displays the deformed shape of the model for the default load case, LOAD1, in the active display window. The double view windows in SAP2000 enables us to display the deformed shape for two load cases, which allows to make comparative analysis. The display of the deformed shape provides details such as the member force diagram box by selecting the component being analyzed...i.e. by moving the cursor to a specific location we can read the values of the forces at that point. As mentioned earlier, SAP2000 can use the analysis results to design appropriate structural members. SAP2000 is equipped with information about the updated codes and specification, these can/will be used to check the safety level of the structure. In fact, SAP2000 will suggest various design options for the structural members properties, and engineering judgement will be used to select the most appropriate design to meet the previously discussed design criteria. VIII. Foundation: â—Ź Soil investigation: â—‹ Soil Bearing Capacity â—‹ Earthquake resistivity of the soil â—‹ Underground utilities â—Ź Design dimension selection
  • 17. â—Ź Calculations/design procedure: â—Ź Pictures from the DESIGN CODES â—Ź Design Sectional Dimensions ( input) â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected) IX. Deliverables: â—Ź Detailed Construction drawings of typical beam â—Ź Detailed Construction drawings of typical column â—Ź Detailed Construction drawings of typical slab section â—Ź Detailed construction drawings of typical ramp section Conclusion: â—Ź Reintroduce the project’s objective â—Ź Discuss the challenges encountered â—Ź What recommendations? â—Ź What did I learn?
  • 18. V. Defining load cases. Now, it is time to give SAP2000 the applied load’s information. The steps are: 1. From Define menu, choose Static load cases… This will display the define load case dialog box. 2. This dialog box will display the default load, LOAD1, with type set to Dead, and self-weight multiplier set to unity. This will automatically include the self-weight of structural members in the analysis based on preset specific weights given in function of the material type. We don’t have to change anything for this first load case. But if you wish to enter the weight by your self and put it as joint load, or if you went to ignore the offset of the dead weight, then you should change the self- weight multiplier to 0 to avoid count the self weight twice. 3. Define additional load cases, change the LOAD1 to LOAD2 (or the case you defined), select load type from the Type drop-down list box, change the self- weight multiplier to appropriate number. In most times, you change the self- weight multiplier to 0 because dead load already count dead load in LOAD1). Then click on the Add new Load button to notify SAP2000. Repeat this step until you define all the load cases. 4. Finally, click OK to back to main window.
  • 19. In the following section of assigning joint load cases, you must assign a numerical volume and the location of each joint loads for every load cases. VI. Assigning loads. For simplicity, we just talk about assigning joint loads. If you wish to apply a distributed load on a member, you can refer to SAP2000 manual for detail. To assign joint loads execute the following steps: 1. Select the joints which have the same joint loads. You can use one of the three selection methods used previously to select members. 2. From the Assign menu, choose Joint Static Loads, then Forces… from the submenu. This will display the Joint forces dialog box. 3. In this dialog box, accept the default load case name as LOAD1, enter the corresponding joint force components in the Load area. Click OK to accept the above joint loads. 4. Repeat steps a, b and c until you assign all the joint loads of this load case defined to this structure. 5. Repeat steps a, b, c and d until you finish every load case’s load assignment. VII. Assigning restraints. It is very important to assign restraints to your structure. Otherwise your structure will become unstable or it becomes a free body and it cannot be solved by SAP2000. Applying joint restraints requires the following steps: 1. Click the Pointer Tool button ( i.e. ) in the Floating Toolbar. 2. Click the joints which have the same restraints.
  • 20. 3. From the Assign menu, choose the JointĂ  Restraints… from the submenu. This will display the joint restraint dialog box. 4. In this dialog box, choose appropriate restraint parameter. Then click OK to accept this assignment. 5. Repeat steps a, b, c and d until you finish the restraint assignment. PART II. SolvingIn this part SAP2000 will assemble and solve the global matrix. The following steps are needed: 5. From the Analysis menu, select Set Option… This will display the Analysis Option dialog box. 6. In this dialog box, check the available DOF. If you are analyzing a plane truss, check UX and UY, leave the UZ, RX, RY and RZ blank. 7. Click OK to accept what you choose. 8. From the analysis menu, select Run. This will display the Save Model File As dialog box. 9. In this dialog box, save the model under a filename. No extension is necessary. 10. Click the OK button, the analysis will begin. A top window is opened in which the various phases of analysis process are progressively reported. When the analysis is complete, the screen will display the message "ANALYSIS COMPLETE". 11. Click OK button in the top window to close it.
  • 21. PART III. Postprocessing. The main options in post processing are: 6. Displaying the deformed shape. 7. Displaying the member forces. 8. Printing the results. 9. Designing the structural members and checking the safety of a design. 10. Modifying the structure. For simplicity, we just discuss the three fundamental options: displaying the deformed shape, displaying the member forces and printing results here. 1. Displaying the deformed shape. After the analysis is complete, SAP2000 automatically displays the deformed shape of the model for the default load case, LOAD1, in the active display window. We can now display the deformed shape for another load case in one of the two view windows. 1. Activate one of the two view windows by clicking anywhere inside that window. 2. Click the display deformed shape button on the floating toolbar. This will display the deformed shape dialog box. 3. In the drop down list in the load area of this dialog box, select the load case to be displayed, then click OK button. The deformed shape will show. 1. Displaying the member forces. 1. From the Display menu, click the Show element forces/stressesĂ  frames, this will display the member force diagram dialog box. 2. In this dialog box, select the component which need to display (for truss, choose Axial force) in the Component area, and click OK button. The axial force diagram for the
  • 22. entire truss is displayed. By moving cursor to a specific location, we can read the values of the force at that point. 1. Printing the results. 1. From File menu, select Print Output Table… In the display dialog box, click OK to accept the default setting. The detailed output results will be printed. 2. From File menu, select Print Input Table… In the display dialog box, click OK to accept the default setting. The detailed input information will be printed. You can also get the detailed results in another way. When we analyze a structure, by default, SAP2000 will create three output files: filename.out, filename.log and filename.EKO. The output file filename.out stores the output of your analysis. The output file filename.EKO stores the input information for this structure. The output file filename.log take all of the running information. These files are text files. You can print these files using computer operating system. For example, we can print these files from Notepad. The steps are: 1. Open Notepad by double click the Notepad icon on the main window. 2. From File menu, choose Open. This will display a standard Microsoft file selection dialog box. 3. In this dialog box, choose the drive and subdirectory where your file is located. 4. Click on the file name you want to display and print. (i. e. any one of filename.out, filename.EKO, or filename.log.) 5. Click OK to terminate this dialog box. Your file will display by Notepad. 6. Review the file to make sure your results are correct. 7. From File menu, choose print… This will display the print dialog box. 8. Click OK to accept the default print setting. Your file will print on background.
  • 23. 9. Repeat steps b, c, d, e, f, g and h to print another file. 10. Close Notepad by choosing Exit from the File menu. â—‹ INPUTS: â–  structural frame model â–  loads â—‹ OUTPUTS: â–  â—Ź LOADS: â—‹ Load Combinations: â—‹ Load assignment: â–  Live loads â–  Dead Loads â–  Earthquake Loads â–  Rain Loads â–  Wind Loads â—Ź OUTPUTS: â—‹ Moments â—‹ Axial Forces â—‹ Lateral Forces: â—Ź SELECTION OF APPROPRIATE DESIGN OPTION
  • 24. â—‹ Design for Strength â—‹ Design for Constructability â—‹ Design for a reasonable price â—Ź DEVELOPMENT OF CONSTRUCTION DRAWINGS Critical Design Parts: I. Columns: â—Ź The parking structure will have three series of columns. The exterior columns, the inner columns, and the ram bearing columns. Based on ASCE-7, section XXXXX every section of long span will be composed of __(# of columns)_Columns. This number was determined by dividing the span length and the assumed column spacing of XXXXXX with is equivalent to three parking spots. For design purposes, each column was assumed to be of XX ft by XXXX ft. These dimensions were picked based on ACI recommendations as well as observation data from several parking structures visited around in Southern California. Each of these columns will be made out of cast-in place concrete, reinforced with steel rebars as mentioned earlier. Further down, a discussion will be given on how the appropriate design column size; reinforcement bars’ size, number, placement; concrete’s properties, as well as other design options are developed and selected. As mentioned earlier, the structure will be composed of 5 levels. The columns sections in first level will have a height of XXX ft. This design height was selected based on AASHTO minimum clearance for emergency vehicles, buses and handicap vehicles that will be housed in the first level of the structure. Columns sections in the second, third, and fourth floor will have a height of XXX ft... The columns sections
  • 25. the fifth floor were designed to have a height of XXX ft ... â—Ź Columns design procedure â—Ź Calculations â—Ź Pictures from the DESIGN CODES â—Ź Design Sectional Dimensions ( input) â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected) II. Beams: â—Ź Design dimension selection â—Ź Beam design procedure â—Ź Calculations: â—Ź Pictures from the DESIGN CODES â—Ź Design Sectional Dimensions sketch ( input) â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected) III. Connections: â—Ź Type of connections ( why they were chosen) â—Ź Design in SAP2000 â—Ź Connection design equations IV. Slabs: â—Ź Design dimension selection â—Ź slab design procedure â—Ź Calculations: â—Ź Pictures from the DESIGN CODES
  • 26. â—Ź Design Sectional Dimensions ( input) â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected) V. Ramps: â—Ź Design dimension selection â—Ź slab design procedure â—Ź Calculations: â—Ź Pictures from the DESIGN CODES â—Ź Design Sectional Dimensions ( input) â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected) VI. Stairs: â—Ź Design dimension selection/how manny? â—Ź Beam design procedure Calculations: â—Ź Pictures from the DESIGN CODES â—Ź Design Sectional Dimensions ( input) â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected) VII. Shear Walls â—Ź Design dimension selection â—Ź Calculations/ Design procedure â—Ź Pictures from the DESIGN CODES â—Ź Design Sectional Dimensions ( input) â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected)
  • 27. VIII. Foundation: â—Ź Soil investigation: â—‹ Soil Bearing Capacity â—‹ Earthquake resistivity of the soil â—‹ Underground utilities â—Ź Design dimension selection â—Ź Calculations/design procedure: â—Ź Pictures from the DESIGN CODES â—Ź Design Sectional Dimensions ( input) â—Ź Selected Sectional Dimensions ( Output) [describe, explain why selected) IX. Deliverables: â—Ź Detailed Construction drawings of typical beam â—Ź Detailed Construction drawings of typical column â—Ź Detailed Construction drawings of typical slab section â—Ź Detailed construction drawings of typical ramp section Conclusion: â—Ź Reintroduce the project’s objective â—Ź Discuss the challenges encountered â—Ź What recommendations? â—Ź What did I learn?