Software Application for Analysis Design-Drawing with Case Studies- vadalkar
1. SOFTWARE APPLICATION FOR
ANALYSIS-DESIGN-DRAWINGS –
CASE STUDY USING STAADPRO
HEMANT S VADALKAR
VADALKAR & ASSOCIATES www.vadalkar.com
STADD ENGINEERS MUMBAI www.staadpro.com
ACCE SES SESSION 6 - 3 APR 2021
VADALKAR AND ASSOCIATES 1
2. •For any civil engineering structure, form,
geometry, loads, framing to be decided by
expert engineer along with basic hand
calculations
•Software can be used to validate and fine
tune the results and carry out repetitive
work and complex calculations.
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VADALKAR AND ASSOCIATES
3. Various tools used by engineers for
calculations:
•Log tables
•Slide rules
•Calculators
•Basic computer program coding/ spread
sheets / Matlab
•Commercial software for various
applications
VADALKAR AND ASSOCIATES 3
4. Various software modules for Structural Engineers
Various software modules for Structural Engineers
Various software modules for Structural Engineers
Various software modules for Structural Engineers
• Drafting tools : AutoCAD, Microstation, ZWCAD and many more
• FEM Tools- ANSYS, COSMOS(Solid works), Abaqus, Nastran
• Structural Analysis and Design : STAADpro, ETAB, SAP, RAM, MIDAS,
NISA, STRUDS, Buildmaster, ……
• Design and Detailing : RAM Structural Systems, RCDC,
TEKLA,ProStructures, Draftwin
• Visualisation : BIM, REVIT, Open Building
• Bridge Design : MIDAS, LEAP, RM bridge, CSI Bridge, AutoDesk Bridge
design, LARSA,
• Geotechnical : Plaxis, Soil Vision, GEO5, Geoslope, Rocscience 3D
VADALKAR AND ASSOCIATES 4
6. Structural software is a tool and should
be used by those who have a basic
knowledge of structural engineering
and a clear understanding of structural
behaviour.
Otherwise, one can imagine the
consequence if a car driver tries to fly a
plane ?
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VADALKAR AND ASSOCIATES
7. SOFTWARE......
SOFTWARE......
SOFTWARE......
SOFTWARE......
• THE SIZE OF THE STRUCTURES GREW BIGGER. AND
TIME AVAILABLE IS REDUCING TO PRODUCE
ECONOMICAL DESIGNS ..........
............HELP FROM THE SOFTWARE IS A MUST
STAAD and ETAB are most popular in India.
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VADALKAR AND ASSOCIATES
8. WHILE USING ANY SOFTWARE
. . .
• DETAILED UNDERSTANDING OF THE
SOFTWARE FUNCTIONS AND ITS
LIMITATIONS IS ESSENTIAL.
• AVAILABLE COMMANDS SHOULD BE USED
CORRECTLY.
• RESULTS SHOULD BE APPROPRIATELY
INTERPRETED AND VALIDATED
• RANDOM CROSS CHECK WITH HAND
CALCULATION IS RECOMMENDED
VADALKAR AND ASSOCIATES 8
9. STAADPro
• POPULAR STRUCTURALANALYSIS AND DESIGN
SOFTWARE USED WORLD OVER
• GENERAL PURPOSE SOFTWARE
• ALL TYPES OF STRUCTURES CAN BE ANALYSED
• DATA CAN BE TRANSFERRED TO OTHER
MODULES FOR CREATING DRAWINGS
VADALKAR AND ASSOCIATES 9
11. GOOD MODEL
• ACCURACY OF RESULTS
DEPENDS UPON ANSLYSIS
MODEL
• BETTER TO HAVE SIMPLE AND
APPROXIMATE MODEL THAN
MORE ACCURATE BUT
COMPLEX MODEL
VADALKAR AND ASSOCIATES 11
12. STEPS IN BUILDING A MODEL
• DECIDE ON THE STRUCTURAL
ARRANGEMENT OF BEAMS & COLUMNS
AND PREPARE STRUCTUAL FRAMING
PLAN IN CONSULTATION WITH
ARCHITECTS
• DECIDE PRELIMINARY MEMBER SIZES
BASED ON EXPERIENCE
VADALKAR AND ASSOCIATES 12
13. STAAD MODEL CAN BE
GENERATED -
• WITH THE HELP OF
-THE TEXT EDITOR
- GRAPHICAL GENERATION
- STRUCTURE WIZARD
- IMPORTED FROM CAD
VADALKAR AND ASSOCIATES 13
14. MODEL GENERATION
• USE A SIMPLE MODEL WITH MAIN FRAME
MEMBERS & REDUCE THE DATAFILE SIZE
• GENERALLY NO NEED TO MODEL SLABS BY
ELEMENTS
• CHECK THE DATA GRAPHICALLY
• CHECK THE GEOMETRY, PROPERTIES,
SUPPORTS & LOADS APPLIED.
VADALKAR AND ASSOCIATES 14
18. JOINTS
• PROVIDE JOINTS AT ALL THE INTERSECTIONS.
• NUMBER THE JOINTS SERIALLY FROM LEFT TO
RIGHT;THE JOINTS CAN BE LOCATED EASILY
• REGULAR STRUCTURES ARE DEFINED IN THE
CARTESIAN SYSTEM WHILE CYLINDRICAL
SYSTEM CAN BE USED FOR THE SURFACE OF
REVOLUTION.
VADALKAR AND ASSOCIATES 18
19. Member
• A Member is defined between two joints.
• Specific numbering sequence can be
followed for numbering beams &
columns at different floors.
VADALKAR AND ASSOCIATES 19
22. Member Properties
• FROM THE STANDARD STEEL TABLE
• USER DEFINED (BUILT-UP) SECTIONS
• GENERAL SECTIONS
• PRISMATIC PROPERTY SPCIFICATIONS
• TAPERED MEMBERS
• A PROFILE CAN ALSO BE ASSIGNED
VADALKAR AND ASSOCIATES 22
23. ELEMENTS... WORD OF CAUTION
• SURFACES CAN BE MODELLED USING FINITE
ELEMENTS
• ENSURE NODE COMPATIBILITY WITH
ADJACENT ELEMENTS
• CREATE ELEMENTS WITH ASPECT RATIO <4
AND ANGLE NOT >180, BETWEEN TWO SIDES
• LET THE SHAPE BE CONVEX
• USE FINER MESH FOR MORE ACCURACY
• DO NOT OVER RELEASE
• AUTOMESHING OPTION CAN BE USED
VADALKAR AND ASSOCIATES 23
24. Finite Elements
• Plate/shell finite element based on hybrid formulation. 3-noded
(triangular) or 4-noded (quadrilateral)
• Surface structures such as walls, slabs, plates & shells may be
modeled using finite element.
• Solid elements – for the solution of structural problems
involving general 3-D stresses, eg, dams, soil & rock strata.
VADALKAR AND ASSOCIATES 24
28. Member Release
• One or both ends of a member can be released.
• By specifying release components, individual
degrees of freedom are removed from the analysis.
• Partial moment release.
VADALKAR AND ASSOCIATES 28
32. SPECIAL TYPES OF MEMBERS
• ACTIVE / INACTIVE MEMBERS FOR LOAD
DEPENDENT STRUCTURES
• COMPRESSION ONLY / TENSION ONLY
MEMBERS.
• TRUSS MEMBERS
• CABLE MEMBERS
VADALKAR AND ASSOCIATES 32
36. Material Constants
• Modulus of Elasticity
• Weight Density
• Poisson’s ratio
• Alpha – coefficient of thermal
expansion
• Beta
VADALKAR AND ASSOCIATES 36
37. Material Constants
• DIFFERENT MATERIALS LIKE
CONCRETE, STEEL, ALUMINIUM AND
COMPOSITE MATERIALS CAN BE
DEFINED.
VADALKAR AND ASSOCIATES 37
38. SUPPORTS
• Fixed supports
• Pinned supports
• Fixed but .. Supports
• Spring supports
• Inclined supports
• Automatic spring support
generator for mat foundation
• Unidirectional supports
(compression only springs)
VADALKAR AND ASSOCIATES 38
41. INSTABILITY PROBLEM
• TYPES OF INSTABILITIES :
- STRUCTURAL INTEGRITY;
- LOCAL INSTABILITY ;
- GLOBAL INSTABILITY ;
- MATH PRECISION.
VADALKAR AND ASSOCIATES 41
42. INSTABILITY IS CAUSED DUE TO -
• IMPROPER SUPPORT CONDITIONS
• EXCESSIVE RELEASES
• NAMING ALLAS TRUSS MEMBERS
• APPLYING MOMENTS AT THE NODES OF SOLIDS
• CONNECTING VERY STIFF MEMBER WITH VERY
FLEXIBLE MEMBERS . . .
• DECLARING PLATES AS “PLATE STRESS ONLY” WHEN
BENDING CAPACITY IS NEEDED
VADALKAR AND ASSOCIATES 42
43. CONSEQUENCES OF INSTABILITY -
• LOADS ARE LOST DURING
ANALYSIS
• EXCESSIVE DISPLACEMENTS ARE
CAUSED
VADALKAR AND ASSOCIATES 43
44. Special Topics
• Shear wall modeling
• Diaphragm action of slab
• Combined footing / raft model using Grids or
Finite Elements and compression only soil
springs.
• Finite element applications for tanks, domes,
Flat slabs VADALKAR AND ASSOCIATES 44
46. LOADS
• DEFINE AS MANY PRIMARY LOAD CASES AS POSSIBLE
• LEARN THE LOAD GENERATION FACILITIES AND
LIMITAIONS
• CHECK LOADS GRAPHICALLY
• JOINT LOADS ARE IN GLOBAL DIRECTIONS WHILE
MEMBER LOADS ARE IN LOCAL, GLOBAL OR
PROJECTED DIRECTIONS.
VADALKAR AND ASSOCIATES 46
47. Load generators
• Wind load
• Moving load
• Seismic load
• Time history
VADALKAR AND ASSOCIATES 47
48. LOADS
FLOOR LOAD – Two way distribution
ONEWAY LOAD – one way distribution
Prestress/Poststress load
Temperature load / strain load
Support settlement load
Element pressure loading
VADALKAR AND ASSOCIATES 48
49. WIND LOAD
• WIND LOAD CAN BE GENERATED
ON THE SURFACE BY IDENTIFYING
PANEL
• FOR CERTAIN ODD SHAPES
CORRECTNESS SHOULD BE
CHECKED.
VADALKAR AND ASSOCIATES 49
52. DYNAMIC ANALYSIS
• RESPONSE SPECTRUM ANALYSIS
• TIME HISTORY ANALYSIS
• HARMONIC LOADS
• COMPOSITE DAMPING FOR EACH MEMBER
• BASE SHEAR CALCULATIONS
• EXTRACTION OF FREQUENCY AND MODE SHAPES
• MODAL DAMPING RATIO FOR INDIVIDUAL MODES.
• MISSING MASS FOR RESPONSE SPECTRUM LOAD
CASES.
• ATTACHING SIGNS OF DOMINANT MODE
VADALKAR AND ASSOCIATES 52
55. RESULTS VERIFICATION
• TEXT OUTPUT & GRAPHICAL RESULTS
VERIFICATION.
• DEFLECTED & MODE SHAPES.
• BENDING MOMENT & SHEAR FORCE DIAGRAMS
OF INDIVIDUAL BEAMS AS WELLAS THE ENTIRE
STRUCTURE.
VADALKAR AND ASSOCIATES 55
56. RESULTS VERIFICATION
• USER CONTROLLED SCALE FACTORS
• FORCE/MOMENT ENVELOPE PLOTS AS
MAX/MIN FOR ALL CODES
• STRESS CONTOUR PLOTS
• CODE PERFORMANCE PLOTS FOR STEEL
DESIGN
VADALKAR AND ASSOCIATES 56
64. • CHECK THE DEFLECTED SHAPES, SUPPORT
REACTIONS, STATICS CHECK, BENDING MOMENT &
SHEAR FORCE DIAGRAMS
• CHECK THE RESULTS BY QUICK HAND CALCULATIONS,
IF REQUIRED.
• VERIFY THE RESULTS GRAPHICALLY & LOGICALLY
• USE P-DELTA, NON-LINEAR & DYNAMIC ANALYSIS
UNDER EXPERT GUIDANCE
VADALKAR AND ASSOCIATES 64
65. ASSUMPTIONS IN ANALYSIS
& DESIGN
• ENSURE THE CONSISTENCY IN
ASSUMPTIONS MADE DURING THE
MODELING, ANALYSIS, DESIGN &
ACTUAL DETAILING.
VADALKAR AND ASSOCIATES 65
66. CONSISTANCY OF ASSUMPTIONS IN
ANALYSIS & DESIGN
• TORSION NEGLECTED IN RCC
BEAM DESIGN
• RELEASES USED IN MODEL
• CONNECTION DETAILS IN STEEL
STRUCTURES : SIMPLE (SHEAR
CONNECTIONS) OR RIGID
(MOMENT CONNECTION)
VADALKAR AND ASSOCIATES 66
67. STEEL DESIGN
• Defining correct design
parameters;
• Code check / member selection as
per IS800-84, IS800-2007
• Quantity calculation
VADALKAR AND ASSOCIATES 67
73. STAAD Foundation advance
• Can read support reactions from STAAD
analysis
• Design Isolated footings, combined footings,
Pile caps, MAT foundation
• Produce design calculations and drawings
• Analyse and design machine foundations and
vessel foundations.
VADALKAR AND ASSOCIATES 73
76. RCDC- STAAD advance concrete Design
• Can read analysis results from STAAD / ETAB
analysis
• Design slabs, beams, columns, shear walls,
Isolated footings, Pile caps, Flat Slabs and MAT
foundation
• Produce design calculations and drawings
• Produce bar bending schedule and quantity
calculations and cost estimates
VADALKAR AND ASSOCIATES 76
81. ALWAYS COMPARE THE
RESULTS OF THE
COMPUTER MODEL
WITH THE
APPROXIMATE
ANALYSIS AND DESIGN
BY
HAND CALCULATIONS !
VADALKAR AND ASSOCIATES 81
82. Case studies and
Case studies and
Case studies and
Case studies and
projects using
projects using
projects using
projects using
STAADPro
STAADPro
STAADPro
STAADPro
VADALKAR AND ASSOCIATES 82
83. FOOT OVER BRIDGE : PUNE RAILWAY
FOOT OVER BRIDGE : PUNE RAILWAY
FOOT OVER BRIDGE : PUNE RAILWAY
FOOT OVER BRIDGE : PUNE RAILWAY
STATION 2004
STATION 2004
STATION 2004
STATION 2004
VADALKAR AND ASSOCIATES 83
84. TYPICAL CROSS SECTION OF BRIDGE
TYPICAL CROSS SECTION OF BRIDGE
TYPICAL CROSS SECTION OF BRIDGE
TYPICAL CROSS SECTION OF BRIDGE
VADALKAR AND ASSOCIATES 84
91. BOOKING OFFICE THANE RAILWAY
BOOKING OFFICE THANE RAILWAY
BOOKING OFFICE THANE RAILWAY
BOOKING OFFICE THANE RAILWAY
STATION EAST 2002
STATION EAST 2002
STATION EAST 2002
STATION EAST 2002
VADALKAR AND ASSOCIATES 91
100. INDOOR STADIUM AT
INDOOR STADIUM AT
INDOOR STADIUM AT
INDOOR STADIUM AT
NASHIK 2001
NASHIK 2001
NASHIK 2001
NASHIK 2001
FOR
FOR
FOR
FOR
NASHIK MUNICIPAL
NASHIK MUNICIPAL
NASHIK MUNICIPAL
NASHIK MUNICIPAL
CORPORATION
CORPORATION
CORPORATION
CORPORATION
VADALKAR AND ASSOCIATES 100
111. VADALKAR AND ASSOCIATES 111
100 MLD SEWAGE TREATMENT PLANT AT
100 MLD SEWAGE TREATMENT PLANT AT
100 MLD SEWAGE TREATMENT PLANT AT
100 MLD SEWAGE TREATMENT PLANT AT
NERUL , NEW MUMBAI : 2006 C TECH CABIN
NERUL , NEW MUMBAI : 2006 C TECH CABIN
NERUL , NEW MUMBAI : 2006 C TECH CABIN
NERUL , NEW MUMBAI : 2006 C TECH CABIN
113. WALL SECTION : FEM ANALYSIS
WALL SECTION : FEM ANALYSIS
WALL SECTION : FEM ANALYSIS
WALL SECTION : FEM ANALYSIS
VADALKAR AND ASSOCIATES 113
114. WALL WITH BUTTRESS FOR ECONOMICAL DESIGN
WALL WITH BUTTRESS FOR ECONOMICAL DESIGN
WALL WITH BUTTRESS FOR ECONOMICAL DESIGN
WALL WITH BUTTRESS FOR ECONOMICAL DESIGN
VADALKAR AND ASSOCIATES 114
117. C TECH
C TECH
C TECH
C TECH
BASIN
BASIN
BASIN
BASIN
VADALKAR AND ASSOCIATES 117
118. DEPARTMENT OF ENERGY SCIENCE AND
DEPARTMENT OF ENERGY SCIENCE AND
DEPARTMENT OF ENERGY SCIENCE AND
DEPARTMENT OF ENERGY SCIENCE AND
ENGINEERING : IIT BOMBAY 2013
ENGINEERING : IIT BOMBAY 2013
ENGINEERING : IIT BOMBAY 2013
ENGINEERING : IIT BOMBAY 2013
VADALKAR AND ASSOCIATES 118
134. PILING GANTRY
PILING GANTRY
PILING GANTRY
PILING GANTRY
FOR
FOR
FOR
FOR
MARINE WORKS
MARINE WORKS
MARINE WORKS
MARINE WORKS
VADALKAR AND ASSOCIATES 134
