Design of slabs 2 suranaree university of technology. Design the minimum slab thickness to support a fork lift specified below and storage racks specified below throughout. Propose allowable acceptance criteria for slabonground foundation movement. A2 slab thickness design by wri method a3 design examples using coe charts a4 slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. The design procedure separately incl udes determining thickness of slab under wall load. Ce 437537, fall 2002 slab ongrade example design info 1 8 design the thickness for a slab ongrade concrete slab in a warehouse. Concrete slab floors come in many forms and can be used to provide great thermal comfort and lifestyle advantages. Advantages of using posttensioning for your next slab on ground project. Pdf design of monolithic concrete ground floors814. They can be insulated, both underneath and on the edges. A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft.
Safety of wire mesh reinforced concrete slabs and steel fibre reinforced concrete slabs is discussed. Reported by committee 302 american concrete institute. Find the following parameters for design moments in step 2 per unit width step 4 note. Reinforced concrete slab design and detailing guide is456. Flat slab analysis, design and detailing pdf civil. Such slabs are referred to as membrane slabs, floating slabs, or filler slabs and range in thickness from as little as 4 to 8 depending on the supported loads. Design of slabs on grade aci committee was specifically charged to cover design. Over the past two decades the idea of pouring concrete over cupolex permanent void forms has become an increasingly popular slab foundation method.
One way slab design procedure with example design of one. Concrete floor slabs on grade are subjected to a varie ty of loads and loading conditions. Slab on ground design by using the pti ken bondy method. A comparison with conventional design methods is performed. Criteria for selection and design of residential slabson. Jul 02, 2010 lecture series on design of reinforced concrete structures by prof. Concrete slabs supported on soil are analysed with the model proposed. Determining slab thickness starts with the purpose of the slab, its use and its loads, in addition to applicable standards. Dhang, department of civil engineering, iit kharagpur.
This paper presents a method of design and other issues related to industrial floors. Refer to aci 223 for procedures for the design and construction of shrinkagecompensating concrete slabs on ground. Recommended practice for the design of residential foundations version 1. A 2 2area 2 a c 2 2 posttensioned concrete design table 11 list of symbols used in the aci 31808 code cp area enclosed by the outside perimeter of the section, in a g gross area of concrete, in a 2 l total area of longitudinal reinforcement to resist torsion, in a o area enclosed by the shear flow path, sqin a oh area enclosed by the centerline of the outermost closed. The construction of slab on ground requires certain basic design elements. Packard portland cement association, 1976 concrete floor slabs on grade subjected to heavy loads army technical manual tm 580912, air force manual afm 883, chapter 15 1987.
Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. The formwork shall be designed to withstand construction loads such as fresh concrete pressure and weight. Recommended practice for the design of residential. Since the books initial publication in 1980, it has been used by engineers and contractors to successfully design and construct hundreds of thousands of posttensioned slabs on ground. Institute pti design procedure for designing posttensioned slabs on ground. Design the slab following the provisions of the aci code. These design elements must be enlisted and added in the contract documents by the designer in charge before asking for a bidding. Rc slab design ec2 worked example bending reinforcement.
Construction of slabs on ground design considerations aci. Online concrete slab on grade analysis calculator for slab subjected to interior concentrated post or wheel loading assuming slab is reinforced for shrinkage and temperature only. Should it make any difference to a buyer what kind of slab on ground foundation a house has. Criteria for selection and design of residential slabs on ground author. Following are the rcc slab design and detailing guidelines. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. Calculators for structural engineers, construction professionals and steel building specifiers. Fatigue failure due to slab flexure erosion failure due to foundation compression edge loads produce the worst stresses fatigue based on tensile stress due to edge loads corner loads produce the worst deflections erosion based on deflections due to corner loads 2. The recommendations derived from these and other studies vary from extremely light to extremely heavy. A new method for designing floor slabs on grade due to the difficulty of applying simplified design methods, amongst them being the portland cement association pca and wire reinforcement. Posttensioning will reduce cracking and keep any cracks that might. Since the books initial publication in 1980, it has been used by engineers and. Information on other aspects, su ch as materials, construction methods, placement of concrete, and finishing techniques, is. The construction and design of concrete slabs on grade.
Aci 360, design of slabs on grade, refers to this as a type b slab. Slab on ground design should result in sufficient strength to support without distressing the loads applied to the finished surface. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabs on ground. Because the concrete slab on ground is assumed to be continually supported, an adequate soilsupport system is critical to the slabs performance. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. After this publication, it was subsequently adopted by the uniform building code ubc as. The design procedure includes determini ng slab thickness based on moving live loads and then checking adequacy of slab thickness for stationary live load.
Slabs can be on ground, suspended, or a mix of both. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. Both slab on grade and structural slabs can be created using this formwork. Ce 437537, fall 2002 slabongrade example design info 1 8. Oct 05, 2019 reinforced flat slab design spreadsheet flat slab system is an important division of concrete floor system. Construction maintenance of post tensioned slab on ground. Develop and report on criteria for design of slabs on grade, except highway and airport pavements 1. This document addresses the foundations of residential and other lowrise buildings that are 4stories or less. This guide presents information on the design of slabs on ground, primarily industrial floors. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Tm 580912 concrete floor slabs on grade subjected to. Design of the composite flooring slab with profiled sheets t153 ruukki for a residential building, 35 pages, 1 appendix saimaa university of applied sciences, lappeenranta technology, civil and construction engineering civil and construction engineering bachelouv theviv 201. The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length.
For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. Construction of slab on ground design elements the construction of slab on ground requires certain basic design elements. Ce 437537, fall 2002 slabongrade example design info 1 8 design the thickness for a slabongrade concrete slab in a warehouse. Manual design of beam and raft foundation to eurocode 2 free. Pdf a new method for designing floor slabs on grade due. The performance and serviceability of residential and other lowrise building concrete slab foundations has been discussed and analyzed for over 30 years. The design procedure set forth in that publication had at that time been in use by the author for about 15 years. The service live load is 100 psf and 4000 psi concrete is specified for use with steel with a yield stress equal to 60000 psi. Background information on design theories is followed by discussion of the types of slabs, soilsupport systems, loadings, and jointing. The design of suspended floors should conform to requirements of aci 318 and aci 421. Reinforced concrete design 1 design of slab examples and. Reinforced concrete design 1 design of slab examples.
Analysis and design of slabs on grade with single layer of reinforcement ground supported slabs are frequently designed with a single layer of reinforcing. Design methods are given for unreinforced concrete. Tm 580912 concrete floor slabs on grade subjected to heavy. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter.
The intended audiences for the use of this document are members of ptis slab on ground committee as well as engineers and others involved in the design of foundations for residential and other lowrise structures. Design and construction of posttensioned slab on ground 1980. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway slabs as per is 456. It has been the most common material used in slabs but several new. What are conventionally reinforced slab on ground foundations. The axial forces in the ground floor columns have been presented in figure 3, and have been used to demonstrate how you can carry out design of beam and raft foundation manually. Calculate lateral loads continued in the additional information provided in the description of the house, the top of footing is 24 in. After a highly successful first run, the posttensioning institutes design and construction of posttensioned slabs on ground has been extensively revised. It is important to point out that the use of ground beams with relatively large depth is usually based on dpc considerations, since the raft slab functions as the. The soil nonlinear behaviour and the loss of contact between slab and soil are accounted for. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor.
Impact of climatic variation on design parameters for slab. The execution of the design will be explained with reference. First designs to follow the brab report required foun. Feb 07, 2014 a short tutorial showing how the main reinforcement in a simply supported slab is designed using ec2. In addition to an updated thickness design procedure, the text includes a discussion of concrete drying, shrinkage, joint stability, floor flatness and levelness, moisture testing and floor coverings, concrete durability, floor maintenance and repair, special floor types including white concrete floors, and a glossary of slab on ground terms. Asce, secb course content slab on grades construction.
Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. A second video shows how the shear resistance of the slab and its deflection are checked. It addresses the planning, design, and detailing of slabs. The construction and design of concrete slabs on grade d. It was actually the widespread use of the posttensioned slab on ground which induced this interest in design procedure and in many studies of reported slab failures. Design of slab for flexure 067 m unit width of slab. The new and improved slabonground design manual concrete.
Impact of climatic variation on design parameters for slab on. A detailed explanation will be given of the checksto be carried out, the aspects to be considered in the design and the construction procedures and sequences of a posttensioned slab. A monolithic or thickenededge slab is a ground supported slab on grade with an integral footing i. Model and design slab on ground, end bearing piles and friction piles using the inducta software. Structural details of slab culverts 3 for spans less than 3. Introduction concrete slabs on grade are a very common type of concrete construction. Concrete floor slab construction process includes erection of formwork, placement of reinforcement, pouring, compacting and finishing concrete and lastly removal of formwork and curing of concrete slab. Do not alter the drainage pattern of the site provide a minimum of 3%. Grdslab concrete slab on grade analysis spreadsheet.
Model slab on ground using either the winkler model or soil structure interaction. Design of slabs on ground aci 360r06 by american concrete institute slab thickness design for industrial concrete floors on grade is195. Flat slab analysis, design and detailing pdf civil engineering. Guide to design of slabs on ground reported by aci committee 360 aci 360r10 this guide presents information on the design of slabs on ground, primarily industrial floors. Design a thickened slab to support the columns and. Although the pti method significantly advanced the art of engineering for slabs on ground when introduced in. Background information on design theories is followed by discussion. What are the significant differences between conventionally reinforced and posttensioned slab on ground foundations.
Concrete slab on grade analysis calculator for post or. Reinforced concrete design s u r a n a r e e institute of engineering university of technology school of civil engineering design of twoway slab moment coefficient method load transfer from twoway slab bar detailing design example slab on ground design of slabs 2 g g b b b b b b l s. Propose allowable acceptance criteria for slab on ground foundation movement. First designs to follow the brab report required foundations heavier even than the san antonio. Slabs on ground typically are designed as unreinforced sections. Download aci 360r10 guide to design of slabsonground pdf. Design of slabs on ground aci 360r06 by american concrete institute.
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