Joint spacings a r e not critical to the design, other than for construction purposes, since some cracking is considere d a c c e p t a b l e. Mar, 2019 slab thickness design for industrial concrete floors on grade is195. Pdf a new method for designing floor slabs on grade due to. The formwork shall be designed to withstand construction loads such as fresh concrete pressure and weight. The alternative to using this guide is to go to title 210 national engineering manual, section. Designing floor slabs on grade free ebook download as pdf file. Pdf a new method for designing floor slabs on grade due to the. Slab on grade or grade slab types construction procedure. Ce 403, fall 20 oneway slab design 2 4 aci 31811 referenced pp 2 4 typical concrete floor systems copied from ceco concrete construction pamphlet design procedure a oneway slab is designed by considering a onefootwide strip of slab. Most of the technical documents and drawings available on this site are also available in the above logix 2017 design manual. Calculators for structural engineers, construction professionals and steel building specifiers. 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 quality of a concrete floor or slab is highly dependent on achieving a hard and durable surface that is flat, relatively free of cracks, and at the proper grade and elevation. It is intended to simplify and improve the design of slabs on grade for commercial and residential as well as industrial uses.
Design of slabs on ground aci 360r06 by american concrete institute slab thickness design for industrial concrete floors on grade is195. The report addresses the planning, design, and detailing of slabs. Reported by committee 302 american concrete institute. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabs on ground. It is the only crosslinked 78 pex tubing on the market and its bending diameter is less than 20, making it easy to thread through floor joists. Pdf 57448989designingfloorslabsongradebyboydcringo. This strip is designed basically as if it were a 12inchwide beam, t inches thick. 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. The design procedure set forth in that publication had at that time been in use by the author for about 15 years. This flexibility factor makes 78 pex much less prone to kinking than other 78 pex tubings. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Design of slabs onground reported by aci committee 360 aci 360r06 this document presents information on the design of slabs onground, primarily industrial floors.
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. Introduction concrete slabs on grade are a very common type of concrete construction. Reinforced concrete slab design and detailing guide is456. Develop and report on criteria for design of slabs on grade, except highway and airport pavements 1.
Ce 437537, fall 2002 slabongrade example design info 1 8. This document presents information on the design of slabs on grade, primarily industrial floors and the slabs adjacent to them. Design a thickened slab to support the columns and. Concrete slab supported di rectly on foundation soil. Asce, secb course content slab on grades construction. The minimum thickness can be determined by many factors. Properties of the surface are determined by the mixture proportions and the quality of the concreting and jointing operations. Stresses in floor slabs on grade resulting from vehicular loads a re a function. Pdf a new method for designing floor slabs on grade due.
In turn, the concrete slab and foundation transfer those forces directly to the ground as shown in figure 42. Figure 42 slab on grade and perimeter footing transfer loads into soil. Information on other aspects, su ch as materials, construction methods, placement of concrete, and finishing techniques, is. Design the minimum slab thickness to support a fork lift specified below and storage racks specified below throughout. The comprehensive technical library for logix insulated. For more information on anchorage of braced walls to slab on grade construction, see chapter 3 of this guide. And then, soil investigation is done to design the thickness of the slab. Aci manual of concrete practice, 2006, part 5, guide for concrete floor and slab.
The report addresses the planning, design, and detailing of the slabs. Design guide 11 floors slabsonground for concrete structures. In most cases, the slab thickness is designed as an unreinforced concrete section. Slab on grade a type of foundation with a concrete floor which is placed directly on the soil. Floor slab design floors are designed as slabs on grade. Concrete slab on grade analysis the engineering community. These boards act as a concrete mould, which helps in identifying slab corners. Ce 437537, fall 2002 slabongrade example design info 1 8 design the thickness for a slabongrade concrete slab in a warehouse. Also, minimum tubing is required to gain maximum heating results. 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. What is a good resource for design a slab on grade subjected to a column load. Consequently, aci 360 was formed with this mission. Tm 580912 concrete floor slabs on grade subjected to.
Design of industrial floors lund university publications. For slab on grade construction in sdcs d1 and d2, when the conditions described above require an interior braced wall line to have a foundation, the foundation depth along that interior wall must be at least 18 inches below the top of the slab as shown in figure 35. Batters are marked and placed in position as per plan before concrete pour. I have a column with an 18kip vertical load and soil with 150 pci subgrade modulus and im wondering if i can use a 12 slab. 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. Aci 360, design of slabsongrade, refers to this as a type b slab. Stresses in floor slabs on grade resulting from vehicular loads are a function of floor slab thickness, vehicle weight and weight distribution, vehicle wheel or track configuration. A new method for designing floor slabs on grade due to the. A novel finite element method for designing floor slabs on grade and. The thickness necessary to prothe desired loadcarrying capacity of a rigid slab is a function of five principal variables. Stresses in floor slabs on grade resulting from vehicular loads a re a function of floor slab thickness, vehicle weight and weight distribution, vehicle wheel or track configuration. The base floor may also be comprised of a mud or structural foundation slab complete with waterproofing and wearing slab with the overall system designed to carry. Following are the rcc slab design and detailing guidelines.
This manual prescribes the criteria for the design of concrete floor slabs on grade in buildings for heavy loads and is applicable to all elements. Stepbystep procedures, sample solutions, and commentary ringo, boyd c. Flat plate concrete floor system does not use beams between columns or. 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. Nov 12, 2018 before casting slab on grade, the earth is excavated up to the required depth and compacted to expel air voids. Concrete slab on grade analysis calculator for post or wheel. It was concluded that designing plain concrete slabs without reinforcement on grade according to pca and the wri methods leads to slab fatigue, even though.
The following definitions have been adopted for the manual. 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. Soil classification system and that typical slab on grade construction may involve a base course and a subbase course beneath the slab depending on the supporting value of the subgrade materials. Jan 30, 20 designing floor slabs on grade by boyd c ringo and robert b anderson this comprehensive book will help you select the most costeffective.
Shear strength of beamless slabs usually a controlling factor. Slab on grade design guidance structural engineering. Reinforcing is added to control shrinkage cracking and maximize the distance between designed joints. The wire reinforcing institute recommends the use of the subgrade drag. Monolithic poured cupolex slab on grade typically a 250mm 10 or a 300mm 12 thick monolithic poured cupolex floor slab is used for a standard floor such as residential or light commercial using cupolex h. 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. 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. The base floor within a building may simply be a castinplace concrete slab on grade with limited design considerations for structural support or environmental control functions.
This appendix presents design examples of the retrofitting techniques for elevation, dry floodproofing, wet. Background information on design theories is followed by discussion of the soil support system, loadings, and types of slabs. Grdslab concrete slab on grade analysis spreadsheet. Aci 360, design of slabs on grade, refers to this as a type b slab. Examples c1 through c5 are a set of examples that illustrate the elevation of a singlestory home with a crawlspace. Methods of slab design in d u s t r ial floor designs usually a r e based on one or more of the five design methods listed below. The result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. A good tool for thickness design with various nonuniform loads is concrete floors on ground, published by portland cement association farny. Updated technical documents on this site will be posted regularly, while updated versions of the logix design manual will be posted annually.
This manual supersedes tm 580912afm 883, chapter 15, dated 1 april 1977. The term slabongrade covers all types of slabs resting on ground including industrial floors, residential slabs, airport and highway pavements. The construction and design of concrete slabs on grade. Designing floor slabs on grade civil engineering community. The slab thickness depends on the type of loads on the floor slab. After this publication, it was subsequently adopted by the uniform building. This paper presents a method of design and other issues related to industrial floors. Stresses in floor slabs on grade resulting from vehicular loads are a function of. The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length.
Tm 580912 concrete floor slabs on grade subjected to heavy. 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 20 psf, and unfactored live load 40 psf. Hopefully there are tables that will eliminate the need for fea. Guide for concrete floor and slab construction aci 302. Design of slabs on grade aci committee was specifically charged to cover design. Background information on design theories is followed. The construction and design of concrete slabs on grade d.