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