Manual for design and detailing of reinforced concrete to the. Example composite design design composite concrete slab on steel deck floor for 125 psf live load. Twoway flat plate concrete floor system design structurepoint. Concrete floor slabs on grade are subjected to a variety of loads and loading conditions. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Design the slab, find the size and spacing of reinforcement. The design procedure includes determining slab thickness based. Design of reinforced concrete structures ii twoway slabs 1 1. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. Cost and feasibility of adapting materials on hand vs. Reinforced concrete design 1 design of slab examples. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. Bending will take place in the two directions in a dishlike form.
Aci 360, design of slabs ongrade, refers to this as a type b slab. Direct design method ddm for slab systems with or without beams loaded only by gravity loads. Equivalent tensile stress design appendix 5examples using shrinkagecompensating concrete, p. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported. 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of the bs8110 design process calculate vc concrete shear capacity without reinforcement the design process for the now withdrawn bs8110 design standard works slightly differently to that used in. Purpose of building residential f ck 25 mpa f yk 460 mpa concrete cover 25 mm height of block wall 2. The high accuracy in design calculations of structures is undesirable because there is no capability of estimating many factors affecting on design. 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. 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. Introduction concrete slabs on grade are a very common type of concrete construction.
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. Manual for design and detailing of reinforced concrete to. Concrete slabs are often carried directly by columns without the use of beams or girders. Reinforced and prestressed concrete are used extensively in bridge projects. 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. 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. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. For a sample output refer to twoway flat plate concrete floor slab design example. A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft. The construction and design of concrete slabs on grade.
Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc. Can be used for larger spans with relatively higher cost and higher. Oneway and twoway slabs oneway slabs transfer the imposed. In this example deflection will be calculated and checked to satisfy project deflection limits. Design of cantilever slab spreadsheet engineering books.
The slab has to carry a distributed permanent action of 1. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Concrete slab formwork design calculation concrete. The following sections demonstrate collector design for the example structures in accordance with the three methods outlined above. This example problem of a concrete slab formwork design using an excel spreadsheet is very handy for all construction professionals out there. Reinforced concrete design 1 design of slab examples and. The result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. Design of slab examples and tutorials by sharifah maszura syed mohsin. For uniformly distributed loads of w per square foot of the.
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. They are projections from wall face of lintel beams or floor slabs. Design and construction of concrete formwork 75 several considerations are involved in determining an economical form construction, such as. 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. Equivalent tensile stress design appendix 5examples using. Accordingly, main reinforcement is required in the two directions.
Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. His analysis suggested that the current slab design 1914 underestimated the moments by 30 to 50%. Reinforced concrete sk 33 section through slab showing stress due to moment. Twoway joist concrete slab floor waffle slab system.
Pdf design of reinforced concrete slabs ninos dinkha. The recommendations derived from these and other studies vary from extremely light to extremely heavy. Twoway concrete slab on beams floor analysis and design. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. This tutorial shows how to configure a spreadsheet with the. Plan view of floor system assume partitions will not be damaged by deflections. 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. Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. 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. Pdf reinforced concrete building modeling by staadpro. Even while designing they are considered as oneslabs with cantilever fixed or continuous at. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. In addition to general design guidance and information on detailing practices, this section contains three design examples. Tm 580912 concrete floor slabs on grade subjected to heavy.
Evaluation of collector design for concrete diaphragms. The example presented here is for twoway posttensioned design. Design of reinforced concrete structures ii twoway slabs. The design procedure includes determini ng slab thickness based. The service live load is 100 psf and 4000 psi concrete is specified. Asce, secb course content slab on grades construction. The slab is for an offi ce where the specifi ed load is 1. For slabs spanning in both directions published tables and charts should be used to find bending moment and shear per unit width of slab. Check the applicable joist dimensional limitations as follows. Reinforced concrete slab design and detailing guide is456.
Flat slab analysis, design and detailing pdf civil. 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. Precast concrete design 83 additional requirements for intermediate precast structural walls relating to wall piers. Design of slab for flexure 067 m unit width of slab. M ed is that part of the unbalanced slab bending moments that is transferred into the column at the support. A2 slab thickness design by wri method a3 design examples using coe charts a4 slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. Concrete slab resting on grade containing steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars. Load transfer in a oneway slab, b twoway slab nilson fig.
Design the roof slab, beam and column of house given in figure 1. The reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. Even while designing they are considered as oneslabs with cantilever fixed or continuous at supports. A finite element model may be created to analyse a complicated loading arrangement. Flat slab analysis, design and detailing pdf civil engineering. 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. The following example illustrates the design methods presented in the article timesaving design aids for reinforced concrete, part 2. Only the design of slab bridge will be used for illustration. Find the following parameters for design moments in step 2 per unit width step 4 note. Concrete slab rest ing on grade cont aining steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars. The construction and design of concrete slabs on grade d. The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length. Concrete floor slabs on grade are subjected to a varie ty of loads and loading conditions. 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.
Flat slab system is an important division of concrete floor system. In this example, the latter option will be used to achieve better understanding for the design of twoway joist. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250. Tm 580912 concrete floor slabs on grade subjected to. Structural design of cantilever slabs solved example. We do not need to define any beam shapes since we are using a reinforced concrete slab.
Manual for design and detailing of reinforced concrete to the september 20 code of practice for structural use of concrete 20 2. A2slab thickness design by wri method a3design examples using coe charts a4slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. The following example illustrates the design methods presented in aci 31805 and ibc 2003. Oneway slabs normally design as a beam with cables running in the direction of the span at uniform centres. The slab will be entered later using two different methods, as a cross section and as a schedule based member alternative. The slab is 300 mm thick and columns are 400 mm square. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway.
Although nichols analysis is correct, it was accepted as being. Comparison of oneway and twoway slab behavior economic choices oneway slab on beams suitable span 3 to 6m with ll 35knm2. The first reinforced concrete design manual formerly titled aci design handbook was developed in. Equivalent tensile stress design appendix 5 examples using shrinkagecompensating concrete, p. Oneway and twoway slabs university of asia pacific. 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. 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. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. A civil engineer must know all the aspects regarding the flat floor system. A one way single span reinforced concrete slab has a clear span of. The collectors have been detailed as slab collectors following an example presented by.
A slab strip of unit width is analysed using simple beam theory. The following example illustrates the example building. 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. Reinforced concrete building modeling by staadpro example1 technical report pdf available february 2017 with 7,297 reads how we measure reads. Ce 433, fall 2006 slab design example 1 6 design a oneway slab for an exterior bay of a multistory office building using the information specified below. The steel deck will be used on 86 3continuous spans. Ce 479 fall 05compositefloor decks purdue university. 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.
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