The design shear force can be reduced to account for the loads applied inside the outer perimeter. Concrete slab on grade analysis calculator for post or. Model slab on ground using either the winkler model or soil structure interaction. Chapter 18 concrete slab structures january 2019 188 18. Aci 360r92 design of slabs on grade reported by aci committee 360. Reinforced concrete design 1 design of slab examples. The 6 slab is supported on soil with a subgrade modulus of 100 kcf. Using the pca design chart starting with the slab stress to the contact area, the wheel spacing for our example problem requires a slab thick. The construction and design of concrete slabs on grade. 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. Tm 580912 concrete floor slabs on grade subjected to heavy.
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. The slab is supported on beams of size 225 x 500 mm spaced at 4. Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. Ce 437537, fall 2002 slabongrade example design info 1 8 design the thickness for a slabongrade concrete slab in a warehouse. Determine the loads based on the buildings parameters section d. Sum fatigue and erosion damage factors over all of the. This appendix presents design examples of the retrofitting techniques for elevation, dry floodproofing, wet. Download free demo updated august 8, 2019 soilstructure slab on grade software simplifies the calculation of a. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Grdslab concrete slab on grade analysis spreadsheet. Equivalent tensile stress design appendix 5examples using shrinkagecompensating concrete, p. Divide the floor into slabs no more than 110 ft by 110 ft.
Pdf aci 360r92 design of slabs on grade reported by aci. The scope of this article is limited to the design of industrial concrete floor slabs on. That is, the concentrated post or wheel load is assumed to be well away from a free slab. Ce 437537, fall 2002 slabongrade example design info 1 8.
The result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. Concrete slab resting on grade containing steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars. Install a polyethylene slipsheet directly beneath the slabs. Continuous one way slab figure 1 shows a clear area of 12 m x 8. Stresses in floor slabs on grade resulting from vehicular loads are a function of. That is, the concentrated post or wheel load is assumed to be well away from a free slab edge or corner. 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. Aci manual of concrete practice, 2006, part 5, design of slabs on grade, aci 360r92, chapter 9 reducing the effects of slab shrinkage and curling, 9. Finally, since shear reinforcement is not used in oneway slabs, the concrete must be able to resist the maximum shear force. Design of two way slab example pdf flat slab design pdf bs 8110 concrete design for slab how to pour a concrete slab how to calculate formwork for slab post tension slab slab on grade foundation concrete beam and slab bridge how to pour a 26x36 concrwte concrete slab operation management 9th edition myomlb nigel slab usercentered design, activitycentered design, and goaldirected design. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3.
The pti design procedure is used to design a slab on grade foundation that will respond. Soil design parameters edge moisture variation distance. For slabs with light loads, as those for homes, include wire mesh midway up the thickness of the slab. Examples c1 through c5 are a set of examples that illustrate the elevation of a singlestory home with a crawlspace. The first reinforced concrete design manual formerly titled aci design handbook was developed in. Make the slabs square or rectangular, with an aspect ratio not to exceed 1. Examples to aci, aisc and asce interactive calculation templates to us codes u. The pri m a r y differe n c e s b e t w een each type are re i n f o rc e m e n t details and joint spacing. Bending will take place in the two directions in a dishlike form. This webinar, presented by senior associates todd nelson and koray tureyen of wjes janney technical center, provides an overview of slab on grade design considerations. An interior load condition is assumed for flexural analysis. One way slab design how to design one way slab daily civil. Determine slab thickness and concrete strength as if the slab were unreinforced. Parking lots have most loads imposed on interior slabs sur.
Now, i just need to design my slab on grade for a relatively small uniformly distributed load live load 4. After this publication, it was subsequently adopted by the uniform building. Find the following parameters for design moments in step 2 per unit width step 4 note. Introduction concrete slabs on grade are a very common type of concrete construction. Load transfer in a oneway slab, b twoway slab nilson fig. Manual for design and detailing of reinforced concrete to the. You also need to know the centertocenter wheel spacing, which we will call 80 inches in this example. The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length. Design concrete slab on grade concrete engineering general. It addresses the planning, design, and detailing of slabs. Equivalent tensile stress design appendix 5 examples using shrinkagecompensating concrete, p. A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft. Ce 437537, fall 2002 slab on grade example design info 1 8 design the thickness for a slab on grade concrete slab in a warehouse.
Appendix 5 design example using shrinkagecompensating concrete. Design concrete slab on grade concrete engineering. The design process for the now withdrawn bs8110 design standard works slightly differently to that used in the new ec2 bs en 199211. 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. Guide to design of slabs onground reported by aci committee 360 aci 360r10 this guide presents information on the design of slabs onground, primarily industrial floors. Empirical method a method of design and analysis based on a nationally approved or equivalent standard may be used to design slabs on grade as foundations. Stresses in floor slabs on grade resulting from vehicular loads a re a function. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Ce 403, fall 20 oneway slab design 3 4 aci 31811 referenced pp 2 4 rating. Aci 360, design of slabs on grade, refers to this as a type b slab. Aci 360r10 guide to design of slabsonground american. Manual for design and detailing of reinforced concrete to the september 20 code of practice for structural use of concrete 20 2.
Both slab on grade and structural slabs can be created using this formwork. Only the design of slab bridge will be used for illustration. The slab on grade worksheet assumes a structurally unreinforced slab, aci360type b, reinforced only for shrinkage and temperature. In this example, the calculating value of the effective depth d v is equal to the effective depth d minus the concrete cover c on the bottom surface of the slab. Accordingly, main reinforcement is required in the two directions.
Acknowledgment this article is adapted with permission from reinforcing steel in slabs on grade engineering data report no. The slab on ground is in direct contact with the typical draining layer such as a gravel, sand or a. This guide is not a standard nor a specification, and it is not intended to be included by reference in construction contract documents. Fpasc140 comments on the posttensioning institutes design of posttensioned slabs onground 3rd edition 28 jun 06 on. Asce, secb course content slab on grades construction. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. 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. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. The construction of slab on ground requires certain basic design elements. The design procedure includes determining slab thickness based. Finally, since shear reinforcement is not used in oneway slabs, the concrete. Slabs on grade identifying the problem slabonground is a wellused building solution in north america and other parts of the world, and they are very well known to not provide healthy interior environments. The most common reinforcement associated with slabsongrade is welded wire.
Construction of slabs on ground design considerations aci. Institute pti design procedure for designing posttensioned slabs on ground. Page 5 design manual to bs8110 designing to bs8110 information required if you would like the punching shear specialists at linkstudpsr to produce an accurate calculation using. Design the minimum slab thickness to support a fork lift specified below and storage racks specified below throughout. Design a thickened slab to support the columns and. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Interior walls of the living area elevated are composed of 2x4 studs at 16 inches on center o. Tm 580912 concrete floor slabs on grade subjected to. The construction and design of concrete slabs on grade d. Slab thickness design for industrial concrete floors on grade is195. Manual for design and detailing of reinforced concrete to. The design procedure set forth in that publication had at that time been in use by the author for about 15 years. Determining the purpose of the slab sound design of a slab on grade begins with determining the intended use and performance criteria.
American concrete institute, design of slabs on grade. I have a two storey building, and my second floor and roof loads are transmitted to column footings below my slab on grade. Vapor barriers in direct contact with the slab are discouraged because they increase slab. The attachment of non structural elements is the responsibility of the architect or designer, unless specifically. Concrete floor slabs on grade are subjected to a variety of loads and loading conditions. Guide for design and construction of concrete parking lots. Design of slabs onground aci 360r06 by american concrete institute 2006 4. C 5 is the slope correction coefficient co is the consolidation correction coefficient as an example. Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. Reinforced concrete design 1 design of slab examples and.
Appendix 5design example using shrinkagecompensating concrete. Manual for design and detailing of reinforced concrete to september 20 the code of practice for structural use of concrete 20 contents 1. The major structural components of a slabongrade foundation are the floor slab itself and either grade beams or foundation walls with footings at the perimeter of the slab see figures 42 and 43. The slab has to carry a distributed permanent action of 1. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported. Model and design slab on ground, end bearing piles and friction piles using the inducta software. Except for type f slabs, all slabs are expected to remain essentially uncracked under applied 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. For example, the minimum slab thickness for a twohour fire rating is 4. For example, one might be designing a building slab that is subjected to vehicle traffic such. Oneway and twoway slabs university of asia pacific. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Example design problems can be found in appendix c.
Design steel beam verification of bending resistance r9 to r10 7 shear resistance r11 to 12 8 serviceability limit state verification r12 9 check bearing stress within concrete padstone under the steel beam r 10 check bearing stress under the concrete padstone r14 11 replacement roof slab construction sequence r15. Design and construction of concrete slabs on grade, aci scm1186, american concrete institute, detroit, 1986. Concrete slabsongrade subject to concentrated loads. In this example, a concrete warehouse floor with joints spacing 20 o.