This document discusses long span floor systems and provides classifications and examples of different structural forms used for long spans. It discusses form active systems like cable structures, tent structures and arch structures. It also discusses section active systems like frame structures and surface active systems like shell structures and folded plate structures. Specific examples of projects using different structural forms are provided along with their advantages and limitations.
A presentation that explains the various systems and techniques of employing steel and concrete to support long span structures. The range varies from conventional beams, to trusses and portal frames.
A short and elaborate Case Study on High Rise Buildings for the course of Advanced Building Construction from students of 8th Semester Architecture at VNIT, Nagpur (January- April 2017)
A presentation that explains the various systems and techniques of employing steel and concrete to support long span structures. The range varies from conventional beams, to trusses and portal frames.
A short and elaborate Case Study on High Rise Buildings for the course of Advanced Building Construction from students of 8th Semester Architecture at VNIT, Nagpur (January- April 2017)
Club House Designs by IDEA CENTRE ARCHITECTSsupratikrath
CLUB HOUSE DESIGNS by
IDEA CENTRE ARCHITECTS PRIVATE LIMITED
Initiative for Design Excellence in Architecture
- Posted by Supratik Rath
Manager- Business Development
9902531505
A hollow core slab refers to a precast slab that is prepared using prestressed concrete. It is generally used in the construction of floors for high-rise apartments or multistorey buildings.
Optimum design of double layer dome of span to height ratio 2 and different supporting conditions(all bottom nodes supported, alternate bottom nodes supported and two alternate bottom nodes supported) for a given span is carried out. The formex programming software is used for configurations of double layer dome. The hollow circular pipe sections are used to construct the double layer dome and for connection, the MERO joint is used. Basically the dome have large exposed area so the wind force are predominant, hence the domes are analyze and design for wind forces. For optimum design of the structure, it is analyzed by using the software “SAP-2000-14”. In the analytical part, forces in the top layer are considered in groups and separate section will be designed for each group, the design will be based on IS800:2007. Similar procedure will be adopted for bracing system and bottom layer. The results are compared with different span to height ratios and support conditions for the deflection, weight of structure and concrete for pedestal, to determine optimum configuration by overall. The domes of span 75m with span to height ratio 2 as well as different support condition are designed for wind load. The members of dome are designed for axial tension and compression in such a way to get optimum weight of member.
Club House Designs by IDEA CENTRE ARCHITECTSsupratikrath
CLUB HOUSE DESIGNS by
IDEA CENTRE ARCHITECTS PRIVATE LIMITED
Initiative for Design Excellence in Architecture
- Posted by Supratik Rath
Manager- Business Development
9902531505
A hollow core slab refers to a precast slab that is prepared using prestressed concrete. It is generally used in the construction of floors for high-rise apartments or multistorey buildings.
Optimum design of double layer dome of span to height ratio 2 and different supporting conditions(all bottom nodes supported, alternate bottom nodes supported and two alternate bottom nodes supported) for a given span is carried out. The formex programming software is used for configurations of double layer dome. The hollow circular pipe sections are used to construct the double layer dome and for connection, the MERO joint is used. Basically the dome have large exposed area so the wind force are predominant, hence the domes are analyze and design for wind forces. For optimum design of the structure, it is analyzed by using the software “SAP-2000-14”. In the analytical part, forces in the top layer are considered in groups and separate section will be designed for each group, the design will be based on IS800:2007. Similar procedure will be adopted for bracing system and bottom layer. The results are compared with different span to height ratios and support conditions for the deflection, weight of structure and concrete for pedestal, to determine optimum configuration by overall. The domes of span 75m with span to height ratio 2 as well as different support condition are designed for wind load. The members of dome are designed for axial tension and compression in such a way to get optimum weight of member.
A Study On Pre-Engineered Building – A Construction TechniqueIJERA Editor
Steel industry is growing rapidly in almost all the parts of the world. The use of steel structures is not only economical but also eco friendly at the time when there is a threat of global warming. Time being the most important aspect, steel structures (Pre fabricated) is built in very short period and one such example is Pre Engineered Buildings (PEB).This review from the past experiences presents the results of experimental and analytical studies done on Pre Engineered Building. Results show that these structures are economic, reduces construction cost and time, energy efficient and flexibility of expansion.
The lecture is in support of:
(1) The Design of Building Structures (Vol.1, Vol. 2), rev. ed., PDF eBook by Wolfgang Schueller, 2016: chapter 9.
(2) Building Support Structures, Analysis and Design with SAP2000 Software, 2nd ed., eBook by Wolfgang Schueller: chapter 11.
Finite ElementAnalysis of Doubly Curved Thin Concrete ShellsHARISH B A
thin shell is a “Three-dimensional spatial structure made up of one or more curved surfaces whose
thickness is small compared to their other dimensions”. Shells belong to the class of stressed skin structures which,
because of their geometry and small flexural rigidity of the skin, tend to carry loads primarily by direct stresses acting in
their plane. The shells are subjected to pure membrane state of stress, under appropriate loading and boundary
condition the resulting bending and twisting moments are either zero or small which may be neglected. The coordinates
of funicular shells are determined by masonry mould method by developing a computer program. In this study doubly
curved thin shells are analysed using finite element software SAP 2000. Doubly curved shells which are in square plan
having 10mX10m and 15mX15m are considered and shells in rectangular plan having dimensions 10mX15m
and 15mX20m are considered. The behavior of shells under self-weight, live load varying from 0-20KN/m (UDL) is
obtained. In this case study deflection curves, membrane stress and stress contour diagram are obtained. It is observed
that with the increase in rise and thickness of funicular shell the deflection are reduced. The membrane stresses
decreases with the increase in rise and thickness of concrete funicular shell. The aim of this study is to develop shells of
different sizes and investigation is done on the shells by finite element analysis under given uniformly distributed load,
to find out the behavior of shells in various cases using standard software, Structural Analysis Package (SAP 2000).
Literature Review Basics and Understanding Reference Management.pptxDr Ramhari Poudyal
Three-day training on academic research focuses on analytical tools at United Technical College, supported by the University Grant Commission, Nepal. 24-26 May 2024
CHINA’S GEO-ECONOMIC OUTREACH IN CENTRAL ASIAN COUNTRIES AND FUTURE PROSPECTjpsjournal1
The rivalry between prominent international actors for dominance over Central Asia's hydrocarbon
reserves and the ancient silk trade route, along with China's diplomatic endeavours in the area, has been
referred to as the "New Great Game." This research centres on the power struggle, considering
geopolitical, geostrategic, and geoeconomic variables. Topics including trade, political hegemony, oil
politics, and conventional and nontraditional security are all explored and explained by the researcher.
Using Mackinder's Heartland, Spykman Rimland, and Hegemonic Stability theories, examines China's role
in Central Asia. This study adheres to the empirical epistemological method and has taken care of
objectivity. This study analyze primary and secondary research documents critically to elaborate role of
china’s geo economic outreach in central Asian countries and its future prospect. China is thriving in trade,
pipeline politics, and winning states, according to this study, thanks to important instruments like the
Shanghai Cooperation Organisation and the Belt and Road Economic Initiative. According to this study,
China is seeing significant success in commerce, pipeline politics, and gaining influence on other
governments. This success may be attributed to the effective utilisation of key tools such as the Shanghai
Cooperation Organisation and the Belt and Road Economic Initiative.
Online aptitude test management system project report.pdfKamal Acharya
The purpose of on-line aptitude test system is to take online test in an efficient manner and no time wasting for checking the paper. The main objective of on-line aptitude test system is to efficiently evaluate the candidate thoroughly through a fully automated system that not only saves lot of time but also gives fast results. For students they give papers according to their convenience and time and there is no need of using extra thing like paper, pen etc. This can be used in educational institutions as well as in corporate world. Can be used anywhere any time as it is a web based application (user Location doesn’t matter). No restriction that examiner has to be present when the candidate takes the test.
Every time when lecturers/professors need to conduct examinations they have to sit down think about the questions and then create a whole new set of questions for each and every exam. In some cases the professor may want to give an open book online exam that is the student can take the exam any time anywhere, but the student might have to answer the questions in a limited time period. The professor may want to change the sequence of questions for every student. The problem that a student has is whenever a date for the exam is declared the student has to take it and there is no way he can take it at some other time. This project will create an interface for the examiner to create and store questions in a repository. It will also create an interface for the student to take examinations at his convenience and the questions and/or exams may be timed. Thereby creating an application which can be used by examiners and examinee’s simultaneously.
Examination System is very useful for Teachers/Professors. As in the teaching profession, you are responsible for writing question papers. In the conventional method, you write the question paper on paper, keep question papers separate from answers and all this information you have to keep in a locker to avoid unauthorized access. Using the Examination System you can create a question paper and everything will be written to a single exam file in encrypted format. You can set the General and Administrator password to avoid unauthorized access to your question paper. Every time you start the examination, the program shuffles all the questions and selects them randomly from the database, which reduces the chances of memorizing the questions.
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
ACEP Magazine edition 4th launched on 05.06.2024Rahul
This document provides information about the third edition of the magazine "Sthapatya" published by the Association of Civil Engineers (Practicing) Aurangabad. It includes messages from current and past presidents of ACEP, memories and photos from past ACEP events, information on life time achievement awards given by ACEP, and a technical article on concrete maintenance, repairs and strengthening. The document highlights activities of ACEP and provides a technical educational article for members.
Understanding Inductive Bias in Machine LearningSUTEJAS
This presentation explores the concept of inductive bias in machine learning. It explains how algorithms come with built-in assumptions and preferences that guide the learning process. You'll learn about the different types of inductive bias and how they can impact the performance and generalizability of machine learning models.
The presentation also covers the positive and negative aspects of inductive bias, along with strategies for mitigating potential drawbacks. We'll explore examples of how bias manifests in algorithms like neural networks and decision trees.
By understanding inductive bias, you can gain valuable insights into how machine learning models work and make informed decisions when building and deploying them.
6th International Conference on Machine Learning & Applications (CMLA 2024)ClaraZara1
6th International Conference on Machine Learning & Applications (CMLA 2024) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications of on Machine Learning & Applications.
A review on techniques and modelling methodologies used for checking electrom...nooriasukmaningtyas
The proper function of the integrated circuit (IC) in an inhibiting electromagnetic environment has always been a serious concern throughout the decades of revolution in the world of electronics, from disjunct devices to today’s integrated circuit technology, where billions of transistors are combined on a single chip. The automotive industry and smart vehicles in particular, are confronting design issues such as being prone to electromagnetic interference (EMI). Electronic control devices calculate incorrect outputs because of EMI and sensors give misleading values which can prove fatal in case of automotives. In this paper, the authors have non exhaustively tried to review research work concerned with the investigation of EMI in ICs and prediction of this EMI using various modelling methodologies and measurement setups.
Low power architecture of logic gates using adiabatic techniquesnooriasukmaningtyas
The growing significance of portable systems to limit power consumption in ultra-large-scale-integration chips of very high density, has recently led to rapid and inventive progresses in low-power design. The most effective technique is adiabatic logic circuit design in energy-efficient hardware. This paper presents two adiabatic approaches for the design of low power circuits, modified positive feedback adiabatic logic (modified PFAL) and the other is direct current diode based positive feedback adiabatic logic (DC-DB PFAL). Logic gates are the preliminary components in any digital circuit design. By improving the performance of basic gates, one can improvise the whole system performance. In this paper proposed circuit design of the low power architecture of OR/NOR, AND/NAND, and XOR/XNOR gates are presented using the said approaches and their results are analyzed for powerdissipation, delay, power-delay-product and rise time and compared with the other adiabatic techniques along with the conventional complementary metal oxide semiconductor (CMOS) designs reported in the literature. It has been found that the designs with DC-DB PFAL technique outperform with the percentage improvement of 65% for NOR gate and 7% for NAND gate and 34% for XNOR gate over the modified PFAL techniques at 10 MHz respectively.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
Recycled Concrete Aggregate in Construction Part III
Design of long span floor system
1.
2. Department of Civil Engineering
University of Engineering and Technology
Taxila, Pakistan
Presented To:
Professor Dr. Muhammad Yaqub
Presented By:
Khadim Hussain 2K17-MS-STR-FT-07
Rana Dilawar khan 2K17-MS-STR-PT-02
M. Farrukh Javaid 2K17-MS-STR-PT-11
STRUCTURAL DESIGN PRACTICE
Design of Long Span Floor System
3. 1. Introduction to Long Span Floor System
2. History and Evolution of Long span Floor System
3. Classification of Long Span System
4. Material for long span structures
5. Common Structural Forms for Long Span
6. Conclusion
Contents
3Department of civil Engineering, University of Engineering and Technology, Taxila
4. Introduction
4Department of civil Engineering, University of Engineering and Technology, Taxila
Visibility Flexibility Large Scale Storage
Auditoriums
Stadiums
Exhibition halls
Manufacturing facilities
Aircraft hangars
Long span structures create unobstructed, column-free spaces
greater than 30m (100 feet) for a variety of functions.
5. Dated back to the Roman civilization However, most long-span
buildings then were single level constructed using vaults and
domes.
By the late 20th century, durable upper limits of span were
established for these types:
The largest covered stadium had a span of 204 meters (670 feet).
The largest exhibition hall had a span of 216 meters (710 feet).
And the largest commercial fixed-wing aircraft had a 75–80 meter
(250–266 foot) span hangar.
In these buildings the structural system needed to
achieve these spans is a major concern.
History and Evolution
5Department of civil Engineering, University of Engineering and Technology, Taxila
6. History and Evolution
6Department of civil Engineering, University of Engineering and Technology, Taxila
The major evolution in long span section- active structures has
occurred in the aspect of shift from in-situ to precast construction
Old-to-New long span structures
with their height and spans
7. Classification
Department of civil Engineering, University of Engineering and Technology, Taxila
7
One way to classify long-span and complicated structures
Form active systems
Vector active systems
Section active systems
Surface active systems
8. Form active structural systems are systems of flexible, non-rigid
matter, in which the forces is carried by the form and type of
material.
Example of structures:
1. Cable structures
2. Tent structures
3. Pneumatic structures
4. Arch structures
Form active structural systems
8Department of civil Engineering, University of Engineering and Technology, Taxila
9. Place/Country: Berlin/Germany; Completion: 2000; Business area:
Steel-Glass- Structure; Type: Cable Structures
Place/Country: Berlin/Germany; Completion: 2000; Business area:
Steel-Glass- Structure; Type: Cable Structures
Place/Country: Berlin/Germany; Completion: 2000; Business area: Steel-
Glass- Structure; Type: Cable Structures
Place/Country: Berlin/Germany; Completion: 2000; Business area: Steel-
Glass- Structure; Type: Cable Structures
9Department of civil Engineering, University of Engineering and Technology, Taxila
10. 10Department of civil Engineering, University of Engineering and Technology, Taxila
Pneumatic structures
Air-inflated system air pressure
30–700 kN/m2 (common used)
11. Tent structures
Khalifa International Stadium to feature tensile roofing system
11Department of civil Engineering, University of Engineering and Technology, Taxila
12. 12Department of civil Engineering, University of Engineering and Technology, Taxila
Arch structure
13. Vector active structural systems
13Department of civil Engineering, University of Engineering and Technology, Taxila
Vector active structural systems are systems of solid, straight
linear members, in which the redirection of forces is effected by
vector partition, i.e. by multidirectional splitting of single force
simply to tension or compressive elements
Example of structures:
1. Flat trusses
2. Curved trusses
14. 14Department of civil Engineering, University of Engineering and Technology, Taxila
Flat trusses
15. 15Department of civil Engineering, University of Engineering and Technology, Taxila
Curved Truss
16. 16Department of civil Engineering, University of Engineering and Technology, Taxila
Curved Truss
17. Section active structural system are systems of rigid, solid, linear
elements, in which redirection of forces is done by structural
member’s section and their load transferring efficiency.
Example of structures:
1. Frame structures
Section active structural systems
17Department of civil Engineering, University of Engineering and Technology, Taxila
19. Surface active structural systems are systems of flexible or rigid
planes able to resist tension, compression or shear, in which the
redirection of forces is done by curved geometry in 3 dimension.
Example of structures:
1. Folded plates structures
2. Shell structures
19Department of civil Engineering, University of Engineering and Technology, Taxila
Surface active structural systems
20. THE LEIPZIG MARKET HALL
Leipzig, Germany
1929
Span: 68.5 m
Reinforced concrete shells
20Department of civil Engineering, University of Engineering and Technology, Taxila
22. 22Department of civil Engineering, University of Engineering and Technology, Taxila
Folded plate structures
23. 23Department of civil Engineering, University of Engineering and Technology, Taxila
Kamalapur Rail Station
Bangladesh
24. Materials suitable for various forms of
long span
1.All reinforced concrete including precast
2. All metal (e.g. mild-steel stainless steel or alloyed aluminum
3. Timber
4. Metal/RC combined
5. Plastic-coated Textile material
6. Fiber reinforced plastic
Department of civil Engineering, University of Engineering and Technology, Taxila
24
24
25. 25Department of civil Engineering, University of Engineering and Technology, Taxila
Common Structural Forms for Long Span
Building Structures
Common Structural Forms for long span structures are
1. Insitu RC
2. Precast concrete
3. Structural steel – erected on spot
4. Structural steel – prefabricated and installed on spot
26. 26Department of civil Engineering, University of Engineering and Technology, Taxila
Common Structural Forms for Long Span
Building Structures
5. Cable suspended structures
6. Inflated structures
7. Shell structures
8. Folded plate structures
9. Dome structures
29. Shell Structures
29Department of civil Engineering, University of Engineering and Technology, Taxila
Shell is a type of building enclosures.
Shells belong to the family of arches .
They can be defined as curved or angled structures capable of
transmitting loads in more than two directions to supports.
A shell with one curved surface is known as a vault (single
curvature).
A shell with doubly curved surface is known as a dome (double
curvature).
30. Classification of shells
30Department of civil Engineering, University of Engineering and Technology, Taxila
There are many different ways to classify shell structuresbut two waysare
common:
1. Based on the material which the shell is made of like reinforced
concrete, plywood or steel, because each one has different properties
that can determine the shape of the building and therefore, these
characteristics haveto be considered in the design.
2. Basedon thickness: shells canbe thick or thin.
31. Thin Concrete Shells
31Department of civil Engineering, University of Engineering and Technology, Taxila
There are two important factors inthedevelopment of thethin
concrete shellstructures:
The first factor is the shape which was developed along the history of
these constructions. Some shapes were resistant and can be erected easily.
However, the designer’s incessant desire for more ambitious structures
did not stop and new shapes were designed.
The second factor to be considered in the thin concrete shell structures
is the thickness, which is usually lessthan 10 centimeters. For example, the
thickness of the Haydenplanetarium was7.6centimeters.
32. 32Department of civil Engineering, University of Engineering and Technology, Taxila
Thin Concrete Shells
Barrels shells
The cylindrical thin shells, also called
barrels, should not be confused with
the vaults even with the huge
similarity in the shape of both
structures, because each of these
structures has a different structural
behavior as well as different
requirements in the minimum
thickness and the shape.
33. Thin Concrete Shells
33Department of civil Engineering, University of Engineering and Technology, Taxila
On one hand, the structural
behavior of the vault is based on
connected parallel arches, which
transmit the same effort to the
supports .
Therefore, the materials used in
these structures have to be able to
resists compressions (e.g. stone)
and the thickness is usually higher.
Furthermore, the shape of the
vaults must be as similar as
possible to the arch in order to
achieve the optimum structural
behavior.
34. Thin Concrete Shells
34Department of civil Engineering, University of Engineering and Technology, Taxila
On the other hand, the structural behavior of
the barrels shell is that it carries load
longitudinally as a beam and transversally as
an arch. and therefore, the materials have to
resist both compression andtension stresses.
This factor takes advantage of the bars of the
reinforced concrete, because these elements
can be placed where tension forces are needed
and therefore, the span to thickness Ratios can
be increased. Furthermore, the shapehasfewer
requirements than the vaults and therefore,
new curves like the ellipse or the parabola can
be used improving the aesthetic quality of the
structure
37. Advantages and Disadvantages of Shells
ADVANTAGES
Verylight form of construction.
To span 30.0 m shellthicknessrequired is60mm
Dead load can be reduced economizing foundation and supporting
system
They further take advantage of the fact that arch shapes can span
longer
Flat shapes by choosing certain arched shapes
Esthetically it looks goodoverother forms of construction
37
38. Advantages and Disadvantages of Shells
DIS-ADVANTAGES:
Shuttering problem
Greateraccuracy in formwork isrequired
Good/Skilled Labour and supervisionnecessary
Rise of roof may be a disadvantage
38
39. Folded Plates
39Department of civil Engineering, University of Engineering and Technology, Taxila
Athin-walled building structure of
the shell type.
Folded plates are assemblies of flat
plates rigidly connected together
along their edges in such a way
that the structural system capable
of carrying loads without the need
for additional supporting beams
along mutual edges.
Engineer Eudene Freyssinet performed
the first roof with thefolded structure
in 1923 asan aircraft hangar at Orly
Airport inParis.
40. Folded Plates
FOLDING SYSTEMSIN NATURE
The principle of folding as a tool
to develop a general structural
shape has been known for a long
time.
Folded structure systems which are
analogous to several biological
systems such as found at broad
leaf-tree leaves, petals and foldable
insect wings, are adopted to be
employed in anew, technical way
40
Leafof PalmTree
Beetle InsectWith
FoldableWings
Seashell
41. Folded Plates
The structural characteristics of
folding structures depend on:
Thepattern of thefolding.
Their geometrical basicshape.
Its material.
Theconnection of the differentfolding planes
Thedesign of the bearings.
Movable form work canbeemployed.
Form work required is relatively simpler.
Design involves simpler calculations.
41
42. Folded Plates
Structuralbehavioroffolding
42
Load Distribution process:
At first, the external
forces are transferredto
the shorter edgeofone
folding element.
There, the reaction asan
axial force is divided
between the adjacent
elements.
Thenthe forces transferred
to thebearings. StructuralConditionOf Foldingstructures
43. Folded Plates
Classificationof folded structuresbasedonthe material they are
made of:
Folded structures made of reinforced concrete
Metal folded structures
Folded structures of wood
Folded structures of glass
Folded structures of plastic materials
Folded constructions made in combination of different
materials
43
46. Folded Plates Types
46Department of civil Engineering, University of Engineering and Technology, Taxila
GEODESICDOME
FOLDEDPLATERIGIDFRAME
TAPERED FOLDED PLATES
49. Advantages and Disadvantages of Folded
Plates
49
Advantages
Dead load can be reduced economizing foundation and supporting
system
Theyfurthertakeadvantageofthe fact that archshapes can span longer
Flat shapesby choosingcertain archedshapes
50. Advantages and Disadvantages of Folded
Plates
Disadvantages:
Shuttering is difficult.
Greater accuracy in formwork is required.
Good labor and supervision necessary.
Rise of roof may be a disadvantage.
50
57. Domes
Some of the terminology that isoften associated with domes
include
Apex: the uppermost point of a dome (also known as the ‘crown’).
Cupola: a small dome located on a roof or turret.
Extrados: the outer curve of a dome.
Haunch: part of an arch that that lies roughly halfway between the
base and the top.
Intrados: the inner curve of a dome.
Springing: the point from which the dome rises
57
59. 59
Taj Mahal (1647, Quing Dynasty), Agra, India, 125 ft (38 m) span
corbelled dome
60. Advantages of Domes
Reduces slab curling and shrinkage cracks, providing a higher
quality surface.
Provides an under-slab void for running cables and pipes,
simplifying post-construction installation of new wiring and
utilities.
Allows forming of complete structural suspended slabs on beam
pile foundations.
Can be designed to create under-slab water reservoirs for storm
water management and fire suppression water storage.
60
61. Disadvantages of Domes
The major and simplest disadvantage one can think of is
that domed roof doesn't allow to go beyond ground floor
A non accessible roof is very less preferred
Maintenance of domed roof is difficult
Difficult to carry out roof top installations , for eg. setting
of water storage tanks at top or maintenance room for lifts
61
62. Conclusion
These structures are preferred as having following
features
These structural systems reduce the loads on buildings.
Light weight.
Conventional system.
Economy.
Geometry.
62