Concrete slab formwork design calculation concrete. His analysis suggested that the current slab design 1914 underestimated the moments by 30 to 50%. A2slab thickness design by wri method a3design examples using coe charts a4slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. Concrete floor slabs on grade are subjected to a varie ty of loads and loading conditions. Design and construction of concrete formwork 75 several considerations are involved in determining an economical form construction, such as. The design procedure includes determining slab thickness based. Plan view of floor system assume partitions will not be damaged by deflections. Design of cantilever slab spreadsheet engineering books. The example presented here is for twoway posttensioned design. The following example illustrates the design methods presented in aci 31805 and ibc 2003. The high accuracy in design calculations of structures is undesirable because there is no capability of estimating many factors affecting on design. This tutorial shows how to configure a spreadsheet with the purpose of design the spacing of joists, stringers and shores for a concrete slab form. Example composite design design composite concrete slab on steel deck floor for 125 psf live load.
M ed is that part of the unbalanced slab bending moments that is transferred into the column at the support. The collectors have been detailed as slab collectors following an example presented by. Example 1 reinforced concrete building modeling using concept of autogeneration method by staadpro v8i software, sketch and construct the idealization numbering of joints and members. Solved example a cantilever slab 200 mm thick is 1. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. Design manual to bs8110 outline of the bs8110 design process outline of the bs8110 design process calculate vc concrete shear capacity without reinforcement the design process for the now withdrawn bs8110 design standard works slightly differently to that used in.
The slab is for an offi ce where the specifi ed load is 1. A one way single span reinforced concrete slab has a clear span of. They are projections from wall face of lintel beams or floor slabs. In addition to general design guidance and information on detailing practices, this section contains three design examples. Reinforced concrete sk 33 section through slab showing stress due to moment. Design manual to bs8110 outline of the bs8110 design process outline of the bs8110 design process calculate vc concrete shear capacity without reinforcement the design process for the now. Pdf reinforced concrete building modeling by staadpro. This example problem of a concrete slab formwork design using an excel spreadsheet is very handy for all construction professionals out there. Even while designing they are considered as oneslabs with cantilever fixed or continuous at. Find the following parameters for design moments in step 2 per unit width step 4 note. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. For uniformly distributed loads of w per square foot of the slab, each strip acts approximately like a simple beam uniformly loaded by its share of w. Comparison of oneway and twoway slab behavior economic choices oneway slab on beams suitable span 3 to 6m with ll 35knm2.
Oneway and twoway slabs oneway slabs transfer the imposed. Reinforced concrete design 1 design of slab examples. Can be used for larger spans with relatively higher cost and higher. The following example illustrates the example building.
This is an excellent example of paneuropean collaboration and cembureau, bibm and ermco are delighted to make these authoritative documents available to design engineers, software developers and all others with an interest in promoting excellence in concrete design throughout europe. Asce, secb course content slab on grades construction. Direct design method ddm for slab systems with or without beams loaded only by gravity loads. The reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. Twoway concrete slab on beams floor analysis and design. The design procedure includes determini ng slab thickness based. With some limitations, reinforcement for slabs can be sized using the subgrade drag theory in order to increase the spacing of control or construction joints. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Accordingly, main reinforcement is required in the two directions.
Concrete slab resting on grade containing steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars. Basic design criteria concentrically loaded d2 all sides c critical section for twoway shear b critical section for oneway shear a critical section for flexure outside face of concrete column or line midway between face of steel column and edge of steel base plate typical extent of footing typical. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. The recommendations derived from these and other studies vary from extremely light to extremely heavy. Flat slab analysis, design and detailing pdf civil engineering. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. The slab has to carry a distributed permanent action of 1.
A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft. Purpose of building residential f ck 25 mpa f yk 460 mpa concrete cover 25 mm height of block wall 2. The construction and design of concrete slabs on grade d. Manual for design and detailing of reinforced concrete to. Design of reinforced concrete structures ii twoway slabs. Equivalent tensile stress design appendix 5examples using.
Structural design of cantilever slabs solved example. Introduction concrete slabs on grade are a very common type of concrete construction. He was subjected to attacks by scientists proportional to the amount of under design in their favorite slab design systems which were many at that time. In this example, the latter option will be used to achieve better understanding for the design of twoway joist. For uniformly distributed loads of w per square foot of the. Design of slab for flexure 067 m unit width of slab. The first reinforced concrete design manual formerly titled aci design handbook was developed in accordance with the design provisions of 1963 aci 318 building code by aci committee 340, design. The result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. The construction and design of concrete slabs on grade.
The following example illustrates the design methods presented in the article timesaving design aids for reinforced concrete, part 2. We do not need to define any beam shapes since we are using a reinforced concrete slab. A2 slab thickness design by wri method a3 design examples using coe charts a4 slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. The slab is 300 mm thick and columns are 400 mm square. The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length. This report is intended to serve as a manual of good practice for the design of prestressed concrete flat slabs in addition to the recommended procedures, other methods are described for the sake of completeness and to compare different methods of design. Design the roof slab, beam and column of house given in figure 1. This tutorial shows how to configure a spreadsheet with the.
Equivalent tensile stress design appendix 5 examples using shrinkagecompensating concrete, p. Manual for design and detailing of reinforced concrete to the. Design the slab, find the size and spacing of reinforcement. Bending will take place in the two directions in a dishlike form. These design codes, considered to be the most advanced in the world, will lead to a common understanding of the design principles for concrete structures for owners, operators. Twoway flat plate concrete floor system design structurepoint.
Precast concrete design 83 additional requirements for intermediate precast structural walls relating to wall piers. This design example illustrates the seismic and wind design of a hotel that includes five stories of woodframe construction over a onestory concrete podium slab and is assigned to seismic design category. Cost and feasibility of adapting materials on hand vs. Reinforced concrete design 1 design of slab examples and. The slab will be entered later using two different methods, as a cross section and as a schedule based member alternative. Twoway joist concrete slab floor waffle slab system. Flat slab analysis, design and detailing pdf civil.
Even while designing they are considered as oneslabs with cantilever fixed or continuous at supports. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Pdf design of reinforced concrete slabs ninos dinkha. Concrete slab rest ing on grade cont aining steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars. Oneway and twoway slabs university of asia pacific. A finite element model may be created to analyse a complicated loading arrangement. Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. The service live load is 100 psf and 4000 psi concrete is specified. Evaluation of collector design for concrete diaphragms. A civil engineer must know all the aspects regarding the flat floor system. Equivalent tensile stress design appendix 5examples using shrinkagecompensating concrete, p. This report is intended to serve as a manual of good practice for the design of prestressed concrete flat slabs in addition to the recommended procedures, other methods are described for the sake of.
Check the applicable joist dimensional limitations as follows. It was actually the widespread use of the posttensioned slabonground which induced this interest in design procedure and in many studies of reported slab failures. Aci 360, design of slabs ongrade, refers to this as a type b slab. Reinforced concrete slab design and detailing guide is456. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. For slabs spanning in both directions published tables and charts should be used to find bending moment and shear per unit width of slab. Tm 580912 concrete floor slabs on grade subjected to.
Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway. Design of slab examples and tutorials by sharifah maszura syed mohsin. Design of reinforced concrete structures ii twoway slabs 1 1. Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc.
Point load this problem is designed to demonstrate how to check. Flat slab system is an important division of concrete floor system. The steel deck will be used on 86 3continuous spans. For a sample output refer to twoway flat plate concrete floor slab design example. In this example, the latter option will be used to achieve better understanding for the design of twoway joist slab often called twoway ribbed slab or waffle slab. Concrete slabs are often carried directly by columns without the use of beams or girders. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Basic design criteria concentrically loaded d2 all sides c critical section for twoway shear b critical section for oneway shear a critical section for flexure outside. Only the design of slab bridge will be used for illustration. Ce 479 fall 05compositefloor decks purdue university. A slab strip of unit width is analysed using simple beam theory. Eurocode 2 worked examples the concrete initiative. Manual for design and detailing of reinforced concrete to the september 20 code of practice for structural use of concrete 20 2.
The first reinforced concrete design manual formerly titled aci design handbook was developed in. Although nichols analysis is correct, it was accepted as being. Load transfer in a oneway slab, b twoway slab nilson fig. Concrete floor slabs on grade are subjected to a variety of loads and loading conditions. Reinforced concrete building modeling by staadpro example1 technical report pdf available february 2017 with 7,297 reads how we measure reads. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. Foreword the reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. Oneway slabs normally design as a beam with cables running in the direction of the span at uniform centres. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported. Tm 580912 concrete floor slabs on grade subjected to heavy.
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