On grade slab design pdf

Nov 12, 2018 slabs which are directly laid on the earth to support walls and other structural elements are called as slab on grade or grade slabs. Information on other aspects, su ch as materials, construction methods, placement of concrete, and finishing techniques, is. There are two different types supported slab on grade and monolithic slab on grade. Slab on grade design guidance structural engineering. The design procedure includes determining slab thickness based. The author of this engineering bulletin is robert g. Grdslab concrete slab on grade analysis spreadsheet. Determine the loads based on the buildings parameters section d. Foundation systems for buildings on expansive soils shall be designed and constructed in a manner. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Very good reference for designing concrete slabs on grade. Design the minimum slab thickness to support a fork lift specified below and storage racks specified below throughout.

Concrete slab on grade analysis the engineering community. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported. Asce, secb course content slab on grades construction. Guide for concrete floor and slab construction aci 302. Calculators for structural engineers, construction professionals and steel building specifiers. 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.

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 face of concrete column or line midway between face of steel column and edge of steel base plate typical extent of footing typical d foundation design 8. Pdf a new method for designing floor slabs on grade due to the. Advantages of using posttensioning for your next slab onground project. I have a two storey building, and my second floor and roof loads are transmitted to column footings below my slab on grade. A new method for designing floor slabs on grade due to the. Hopefully there are tables that will eliminate the need for fea. This strip is designed basically as if it were a 12inchwide beam, t inches thick. The designer determines the required slab thickness after determining the controlling loads, the appropriate safety fact o r, and the subgrade modulus. Although many concrete slabs can satisfactorily be cast directly on a soil subgrade, some slabongrade sys tems can be significantly improved by the addition of.

Slabs which are directly laid on the earth to support walls and other structural elements are called as slab on grade or grade slabs. The design procedure set forth in that publication had at that time been in use by the author for about 15 years. Only the design of slab bridge will be used for illustration. Introduction concrete slabs on grade are a very common type of concrete construction.

Ce 437537, fall 2002 slabongrade example design info 1 8. Powered by a sophisticated fem solver increasing capacity and substantially speeding up solution for large and complex models, spmats v8. Stresses in floor slabs on grade resulting from vehicular loads are a function of. I could not find a better reference that covered the subject matter like this book does. The major structural components of a slab on grade 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. Some foundations used for light buildings on shrinkswell soils. 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. Reinforced concrete design 1 design of slab examples. Type d, slab posttensioned for choosing design methods for industrial floor slabs by boyd c. The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length. Development of a design manual for concrete floor slabs on grade 1 introduction background. However, this is not the only means of reinforcing slabs. This grade slab acts as the foundation for a home or building, and provides a stable base for w. Development of the design approach the primary design issues for stiffened slabs on grade are the sizing of the beams.

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. Determining the purpose of the slab sound design of a slab on grade begins with determining the intended use and performance criteria. Design a thickened slab to support the columns and. Also, minimum tubing is required to gain maximum heating results.

Pdf design guide of slab on grade free download pdf. Reinforced concrete design 1 design of slab examples and. Slab on grade or grade slab types construction procedure. 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. 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. Pdf aci 360r92 design of slabs on grade reported by aci. 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 3. This document presents an fpsf design procedure for slab on grade, stem wall foundations, and unventilated crawlspace foundations, and includes design examples, and specific construction methods and details. Develop and report on criteria for design of slabs on grade, except highway and airport pavements 1.

Consequently, aci 360 was formed with this mission. The pti design procedure is used to design a slab on grade foundation that will respond. Now, i just need to design my slab on grade for a relatively small uniformly distributed load live load 4. Design concrete slab on grade concrete engineering. Aci 360r10 guide to design of slabsonground american.

Stresses in floor slabs on grade resulting from vehicular loads a re a function. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabs on ground. 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. Both slab on grade and structural slabs can be created using this formwork.

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. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. 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. Stiffened slab on grade elevated structural slab on piers stiffened slab on grade and on piers thin post tensioned slab figure 1. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Concrete slab on grade analysis calculator for post or wheel. Purpose this information bulletin establishes a list of acceptable analysis method for using existing slabs on grade sog as foundations. To investigate or design a slab with a single layer or reinforcement.

Determining slab thickness starts with the purpose of the slab, its use and its loads, in addition to applicable standards. The construction and design of concrete slabs on grade d. 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. Concrete floor slabs on grade are subjected to a variety of loads and loading conditions. Tm 580912 concrete floor slabs on grade subjected to. Ce 437537, fall 2002 slabongrade example design info 1 8 design the thickness for a slabongrade concrete slab in a warehouse. Reinforced concrete slab design and detailing guide is456. The slab thickness depends on the type of loads on the floor slab. Report design guide of slab on grade please fill this form, we will try to respond as soon as possible. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Analysis and design of slabs on grade with single layer of reinforcement ground supported slabs are frequently designed with a single layer of reinforcing. Anderson key factors to consider include type of slab construction and loading conditions industrial floor designs usually are based on one or.

Basic design criteria concentrically loaded d2 all sides. 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. Design of slabs on ground aci 360r06 by american concrete institute slab thickness design for industrial concrete floors on grade is195. What is grade slab and what is the difference between grade. The slab is outside buildings which subjected to 1 hr fire resistance and design for 50 years design life. 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. Current practice is to use manuals developed for buildings and pavements. Given that you are committing a certain area of the main floor to mechanical systems, this is as good a time as any to plan some storage, and maximize the efficiency of that room.

Foundation analysis and desing foundation design 1. Concrete slab resting on grade containing steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars. Less concrete and steel are needed for the same structural capacity and the slab stiffness is increased so that the slab is better able to resist bending caused by differential soil movements. On grade concrete floor slabs shall be placed on a 4inch fill of coarse aggregate or on a 2inch sand bed over a moisture barrier membrane. Additionally, a simplified design method adopted by the irc is presented. Design and investigation of concrete foundations, mats, combined footings, pile caps, slabs on grade. The result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. 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 recommendations derived from these and other studies vary from extremely light to extremely heavy. Chapter 9reducing the effects of slab shrinkage and this report covers the design of slabs on grade for curling, pg. Over the past two decades the idea of pouring concrete over cupolex permanent void forms has become an increasingly popular slab foundation method.

Learn more about construction procedure with video explanation. Reinforcing is added to control shrinkage cracking and maximize the distance between designed joints. Portland cement association skokie, il abstract various types of concrete slab track are in service in japan, europe and north america. In most cases, the slab thickness is designed as an unreinforced concrete section. Soil design parameters edge moisture variation distance. Tab 1 slab design input required data constants change only if necessary calculated data b notations. Use of 500 grade steel in the design of reinforced concrete slab prof.

Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. Floor slab design floors are designed as slabs on grade. Should i install a poly ethylene vapor barrier or vapor retarder underneath the whole slab. The construction and design of concrete slabs on grade. Aci 360, design of slabs on grade, refers to this as a type b slab. 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 6 slab is supported on soil with a subgrade modulus of 100 kcf. Besides these advantages, there are significant cost savings to the builder and owner by using the cupolex flooring formwork in the design of aerated concrete slabs for residential, industrial, commercial. This webinar, presented by senior associates todd nelson and koray tureyen of wjes janney technical center, provides an overview of slab on grade design. The ability to analyze the capacity of a slab on grade subjected to continuous wall linetype load as well as stationary, uniformly distributed live loads is also provided. They may be supported on two opposite sides only fig.

Download free demo updated august 8, 2019 soilstructure slab on grade software simplifies the calculation of a. Oneway and twoway slabs university of asia pacific. A3 design examples using coe charts a4 slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. Description download design guide of slab on grade comments.

It was actually the widespread use of the posttensioned slab onground which induced this interest in design procedure and in many studies of reported slab failures. The design procedure includes determining slab thickness based on moving live loads and then checking adequacy of slab thickness for. Also, design charts from the portland cement association pca are included to provide an additional method for determiningchecking required slab thickness for flexure. Flat concrete structure built on top of the soil at ground level and does not require support from underground footers or foundation walls. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabs onground. Design example of punching shear in slabs eurocode 2. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. Design of slabs on grade aci committee was specifically charged to cover design. What is a good resource for design a slab on grade subjected to a column load. The most common reinforcement associated with slabsongrade is welded wire fabric. For example, in a 4inch 100 mm thick slab the joint spacing should be about saw cut tooled wall or column expansion joint material slab on grade column contraction joints intersect at diagonals of the square form openings which will be filled after floor has hardened concrete cracks below joints slab isolated from. General design process though many details must be included in the design of a slab on grade, three important components are slab thickness, reinforcement requirements, and joint spacing. This flexibility factor makes 78 pex much less prone to kinking than other 78 pex tubings. Tm 580912 concrete floor slabs on grade subjected to heavy.

Following are the rcc slab design and detailing guidelines. This publication is intended solely for use by professional. 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. Revised builders guide to frost protected shallow foundations. Along with some space for storage, you could consider including laundry facilities, or even a pantry in that space. The following are acceptable methods to design and analyze slabs on grade as. For the flat slab with the general arrangement as shown below, let us design the punching shear for column b1 given the following design information.