Typically it consists of an 85mm thick slab supported by a grid of ribs normally 100mm wide at 1200mm x 1200mm centres. Slabs can be onground, suspended, or a mix of both. Reinforced flat slab design spreadsheet flat slab system is an important division of concrete floor system. Slabs can be on ground, suspended, or a mix of both. Design guide 11 floors slabsonground for concrete structures. Behaviour and design of concrete industrial ground floors. The analysis was performed on the slab of the first floor. For more information on anchorage of braced walls to slabongrade construction, see chapter 3 of this guide. Building structure building foundationsground floors publisher history.
Twoway flat plate concrete floor system analysis and design the concrete floor slab system shown below is for an intermediate floor to be designed considering partition weight 1 knm2, and unfactored live load 1. It is important to note that this approach assumes an. Dead load d x 25 knm 2 where d is thickness of slab in m floor finish assumed as 1 to 2 knm 2. Reported by committee 302 american concrete institute. Calculate aspect ratio aspect ratio 2 longer spanshorter span 2. Steelreinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs may be used for exterior paving see below.
The structural design of a concrete floor slab on grade is primarily controlled by the stresses caused by moving live loads and in some cases the stationary loads. 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. Technical thestructuralengineer 35 technical guidance note. Reinforced concrete slab design guidelines a effective span of slab. E2 extension to appendix b, thickness design of a ground supported floor slab 103 e2.
When the ratio between the long to short side doesnt exceed 2, a twoway slab is present. Ground floor beam layout plan first floor beam layout plan. The alternative to using this guide is to go to title 210 national engineering manual, section. Mixing, transporting, and handling of concrete shall be properly coordinated with placing and finishing works. The cupolex floor slab can be fully suspended on reinforced concrete piles. Figure 42 slabongrade and perimeter footing transfer loads into soil.
Refer to aci 223 for procedures for the design and construction of shrinkagecompensating concrete slabsonground. A one way slab will only have significant bending moments in the short direction. Concrete industrial ground floors a guide to design and construction report of a concrete society working party. This guide presents information on the design of slabsonground on aci 318r, primarily industrial floors. Chapter 5 addresses the design of concrete floors as it relates to their constructibility. Concrete slab floors come in many forms and can be used to provide great thermal comfort and lifestyle advantages. Thickness design of a ground supported floor slab 92.
Ground bearing concrete floors, industrial concrete hardstandings and concrete highway pavements have not, in the past, been perceived as a single type of structural element and their construction has taken place independently of each other. Develops the design methods in technical report 550 design of floors on ground. A guide to design and construction report of a concrete society. Determining slab thickness starts with the purpose of the slab, its use and its loads, in addition to applicable standards. Design methods are given for unreinforced concrete, reinforced concrete, shrinkagecompensating concrete, posttensioned concrete, fiberreinforced concrete slabson ground, and slabson ground in refrigerated buildings, followed by information on shrinkage and curling. These slabs are generally classified as groundbearing or suspended. 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. Additional reinforced internal ribs are used in the slab by additional reinforced internal ribs are used in the slab by introducing pontex, the structural cupolex accessory to provide a structure capable of spanning between stem walls or piles. The design of suspended floors should conform to requirements of aci 318 and aci 421. Design of slabson ground aci 360r06 by american concrete institute slab thickness design for industrial concrete floors on grade is195. Concrete slabonground has a natural advantage in heat storage capacity, resulting from a combination of the nature of the material and the volume of concrete required. To discuss on concrete design mix and trial mix by concrete supplier must be carried out.
Reinforced concrete sk 33 section through slab showing stress due to moment. 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. Concrete slab supported di rectly on foundation soil. Specific design requirements for concrete floor construction are found in aci 360r for slabsonground, aci 223r for shrinkagecompensating concrete floors. The structural design of a concrete floor slab on grade is primarily controlled by the stresses caused by moving live loads and in some cases the. Figure 42 slab ongrade and perimeter footing transfer loads into soil. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete.
Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Edge beams and ribs under load bearing walls are 300mm. In recognition of this, there are products that remove the bulk of the concrete from the middle of the slab by replacing it with. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway slabs as per is following are the rcc slab design and detailing guidelines. Behaviour and design of concrete industrial ground floor slabs.
Steps to building a reinforced concrete ground floor slab of. Interior floor slabs are usually not subjected to the same severe temperature gradients experienced by outside pavements. Method of statement construction of flat concrete floor for. In this paper a design method developed for structural design of this slab system is presented.
Concrete floors on ground portland cement association. For slab on ground floors it provides an understanding of the footing slab selection, design, detailing and construction requirements contained in as 2870 and. A typical base floor slab where the design criteria include controlling moisture migration and water vapor transmission into the interior space can be referred to as a waterproof. The materials used in the present work were concrete from the c3037 class, a500nr steel for. The slab has to carry a distributed permanent action of 1. The first reinforced concrete design manual formerly titled aci design. They can be insulated, both underneath and on the edges. When used in passive solar design, the thermal mass makes a significant the ground floor of roughly ninety per cent of australian homes is of concrete slabonground construction. In many domestic and industrial buildings, a thick concrete slab supported on foundations or directly on the subsoil, is used to construct the ground floor. Reinforced concrete slab design and detailing guide is456. In turn, the concrete slab and foundation transfer those forces directly to the ground as shown in figure 42. The minimum thickness can be determined by many factors.
Reinforced concrete design 1 design of slab examples and. The concrete floor slab itself provides structural support for floor loads and suitable backup for floor coverings and finishes. Pdf on jun 1, 1998, s a austin and others published behaviour and design of concrete industrial ground floor slabs find, read and cite all the research you need on researchgate. Design of groundsupported concrete industrial floor slabs. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. This is in spite of their obvious commonality in the areas of design, materials, geotechnical appreciation and construction. Floor slab construction introduction when developing a scheme for a structure, the choice of. Specific design requirements for concrete floor construction are found in aci 360r for slabs on ground, aci 223r for shrinkagecompensating concrete floors, and aci 421. This guide presents information on the design of slabsonground, primarily industrial floors. Additional reinforced internal ribs are used in the slab by. Lafarge south africa 35 westfield road longmeadow business estate ext 11, edenvale, 1609. Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. Concrete slab on ground has a natural advantage in heat storage capacity, resulting from a combination of the nature of the material and the volume of concrete required. This slab will have significant bending acting in both directions.
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 slabonground terms. Building structure building foundations ground floors publisher history. The construction and design of concrete slabs on grade d. Design of slabsonground aci 360r06 by american concrete institute slab thickness design for industrial concrete floors on grade is195.
For slabonground floors it provides an understanding of the footingslab selection, design, detailing and construction requirements contained in as 2870 and. Asce, secb course content slab on grades construction. Calculation of approximate depth from deflection criteria cl 23. Tm 580912 concrete floor slabs on grade subjected to. However, even interior climate controlled spaces can experience temperature ranges of 40 o to 60 of. Design of slab for flexure 067 m unit width of slab. It addresses the planning, design, and detailing of slabs.
Slabs on ground typically are designed as unreinforced sections. In floor slab, begin concrete placing along the perimeter at one end of the work with each batch placed against previously dispatched concrete. Grdslab concrete slab on grade analysis spreadsheet. Pdf on jun 1, 1998, s a austin and others published behaviour and design of concrete industrial ground floor slabs find, read and cite all the research. The construction and design of concrete slabs on grade. The thickness of a floor slab must be determined early in design because the weight of the slab is an important part of the dead load of the structure. Shear strength of beamless slabs usually a controlling factor. Pdf behaviour and design of concrete industrial ground floor. This does not necessarily reflect adversely on the adequacy of the floor. Industrial floor concrete is lafarges specialised concrete specifically designed.
Subbase slab the subbase for the concrete floor must be construted according to the specification. Reinforced concrete design 1 design of slab examples. The maximum size aggregate should be a nominal 37,5mm concrete stone, which is often blended with a. The following definitions have been adopted for the manual. Ground bearing concrete slabs has been specifically written to break down the walls that have arisen between these three areas and focus on the issues that are common to them all. Most of the work is carried out by both the reinforcement within it and the outer surfaces of the slab.
Twoway flat plate concrete floor system analysis and design. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. When used in passive solar design, the thermal mass makes a significant the ground floor of roughly ninety per cent of australian homes is of concrete slab on ground construction. Refer to aci 223 for procedures for the design and construction of shrinkagecompensating concrete slabson ground. Aci 360r pdf guide to design of concrete slab foundation.
For example, a column might transfer loads from a ceiling, floor or roof slab or from a. Method of statement construction of flat concrete floor. For more information on anchorage of braced walls to slab ongrade construction, see chapter 3 of this guide. Flat plate concrete floor system does not use beams between. The thickness necessary to prothe desired loadcarrying capacity of a rigid slab is a function of five principal variables. 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. Because the concrete slab on ground is assumed to be continually supported, an adequate soilsupport system is critical to the slabs performance. Slabonground is a wellused building solution in north america and. Chandlers tr550 design of floors on ground3, gave additional guidance on calculating slab thickness and was later refined by bca interim technical note 114, which. The british cement association merged with the quarry products association and the concrete centre to form the mineral products association and is.
Concrete industrial ground floors a guide to design and construction report of a concrete society. Design of industrial floors lund university publications. Method of statement construction of flat concrete floor for pt. Design of heavy duty concrete floor slabs on grade. Thickness design of a groundsupported floor slab 92 bl introduction 92 b2 design data 92 b3 zone a. Findotek date rev no prepared by checked by approved by remarks. Therefore it is reasonable to design for the maximum temperature range that the slab will experience during its service life. Slab on ground design should result in sufficient strength to support without distressing the loads applied to the finished surface.
880 286 103 757 288 1384 1083 527 148 642 18 134 378 1501 327 451 613 1143 945 1141 1075 583 716 1496 184 1275 1189 1372 1336 1147 1322 1352 84 594 1234 692 959