The construction and design of concrete slabs on grade d. Care must be taken in designing a home with a slab foundation to avoid a squat appearance. Design methods are given for unreinforced concrete. Consequently, aci 360 was formed with this mission. Floor slab design floors are designed as slabs on grade. Class 8 floors are special cases for service conditions that fall under classes 4, 5 and 6. Aci 360, design of slabs ongrade, refers to this as a type b slab. Concrete floor systems design guide guidelines for high performance slabongrade construction. Advantages and disadvantages of each of these slab designs are provided, including the ability of some slab designs to. Every owner should be advised by the designer and contractor. 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. Flat slab system is an important division of concrete floor system.
Other than these flexural stresses, its only when you. Background information on design theories is followed by discussion of the types of slabs, soilsupport systems, loadings, and jointing. Design of slabs on grade aci committee was specifically charged to cover design. A novel finite element method for designing floor slabs on. The construction and design of concrete slabs on grade. Both slab on grade and structural slabs can be created using this formwork. The materials to be used are grade c25 concrete and grade 500 reinforcement. Over the past two decades the idea of pouring concrete over cupolex permanent void forms has become an increasingly popular slab foundation method.
Determining the purpose of the slab sound design of a slab on grade begins with determining the intended use and performance criteria. Background information on design theories is followed. The report addresses the planning, design, and detailing of the slabs. Base slab the main structural element of the concrete pavement. Advantages and disadvantages of each of these slab designs are provided, including the ability of some slab designs to minimize cracking and curling more than others. A slab is a structural element, made of concrete, that is used to create flat horizontal surfaces such as floors, roof decks and ceilings. 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. Asce, secb course content slab on grades construction. Pdf a new method for designing floor slabs on grade due.
Designing floor slabs on grade by boyd c ringo robert b anderson. Slab on grade flooring options greenbuildingadvisor. 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. In these regions, slabongrade foundations may prove an ideal choice for flat lots. This article presents a methodology for designing slabs on grade for industrial floors where there is an eccentricity between the slab centroid and the gravity centre loads of the loaded axle of forklift trucks travelling over the floor. 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. A slab is generally several inches thick and supported by beams,columns, walls, or the ground.
The slab is outside buildings which subjected to 1 hr fire resistance and design for 50 years design life. Designing floor slabs on grade by boyd c ringo and robert b anderson this comprehensive book will help you select the most costeffective. This paper presents a method of design and other issues related to industrial floors. 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. Reported by committee 302 american concrete institute. Ce 437537, fall 2002 slabongrade example design info 1 8. Theoretical concepts, practi cal applications, basis of. Stepbystep procedures, sample solutions, and commentary 9780924659751 by ringo, boyd c anderson, robert b.
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. Design guide 11 floors slabsonground for concrete structures. The slab thickness depends on the type of loads on the floor slab. Introduction concrete slabs on grade are a very common type of concrete construction. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Improve comfort and save energy in homes with slabon. Specifically, a concrete slab on grade may be subjected to concentrated post or wheel loading.
Stepbystep procedures, sample solutions, and commentary ringo, boyd c. This allows the designer to maintain a constant slab depth without thickening at joints or edges. Pdf a new method for designing floor slabs on grade due to. I could not find a better reference that covered the subject matter like this book does. Tm 580912 concrete floor slabs on grade subjected to. The alternative to using this guide is to go to title 210 national engineering manual, section. Nonsubgrade support can result in slab cracking due to stress concentrations induced by an. Background information on design theories is followed by discussion of the soil support system, loadings, and types of slabs.
Improve comfort and save energy in homes with slabongrade floors. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. The slab has to carry a distributed permanent action of 1. A new method for designing floor slabs on grade due to the. It is based on properties of both the subgrade support and the concrete material. Reinforced concrete design 1 design of slab examples and. Concrete slabs in buildings designing buildings wiki share your construction industry knowledge. It is on bedrock in eastern ontario and i plan to build slab on grade unless there is a better option.
Pdf a new method for designing floor slabs on grade due to the. For example, one might be designing a building slab that is subjected to vehicle traffic such as skid steer loaders, forklifts, trucks or. After this publication, it was subsequently adopted by the uniform building. Develop and report on criteria for design of slabs on grade, except highway and airport pavements 1. In general, characteristics of the concrete slab surface and joint performance have a powerful impact on the serviceability of floors and other slabs. Very good reference for designing concrete slabs on grade. Design of slabs on ground reported by aci committee 360 aci 360r06 this document presents information on the design of slabs on ground, primarily industrial floors. Reinforced concrete slab design and detailing guide is456.
Interior walls of the living area elevated are composed of 2x4 studs at 16 inches on center o. 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. It addresses the planning, design, and detailing of slabs. In most cases, the slab thickness is designed as an unreinforced concrete section. The process determines thickness, any necessary reinforcement, and jointing details as well as standards for construction of the slab. Designing floor slabs on grade stepbystep procedures, sample solutions, and commentary. Concrete floors on ground, 2nd edition, portland cement association, skokie, ill. Flat slab analysis, design and detailing pdf civil. Following are the rcc slab design and detailing guidelines. 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. Designing floor slabs on grade civil engineering community. Then for the given parameters, the slab flexural, bearing, and shear stresses are checked, the estimated crack width is determined, the.
Pdf many aspects must be considered in the design of lowvibration buildings. Designing floor slabs on grade concrete engineering. Advantages and disadvantages of these slab design methods are provided, including the ability of some slab designs to minimize cracking and curling more than others. Design concrete slab on grade concrete engineering general. Simply defined, a slab on grade is structurally reinforced structurally active when the moment capacity of the reinforced slab exceeds the cracking moment of the unreinforced slab. I am hoping to build with advanced framing style and sheath it with 4 inches of exterior foam. Improve comfort and save energy in homes with slabongrade. Design a thickened slab to support the columns and. Design of heavy duty concrete floor slabs on grade.
Concrete slabs in buildings designing buildings wiki. Rc slab design ec2 worked example bending reinforcement. Table 2 s h o ws which design method to use in selecting the appro p r iate slab. Ce 437537, fall 2002 slabongrade example design info 1 8 design the thickness for a slabongrade concrete slab in a warehouse. Designing floor slabs on grade by boyd c ringo robert b anderson free ebook download as pdf file. The closer the steel is to the top of the slab and the more steel used, the more curling will. Ribbed slab floors are most economical for buildings such as hospitals, schools, hotels, and. This is especially true for superflat industrial floors and areas. Reinforcement reinforcing bars or reinforcing mesh complying with asnzs 4671 steel reinforcing. This guide presents information on the design of slabsonground, primarily industrial floors. It also s h ows which methods aid in slab thickness selection, and which h a v e information on related det a i l s, such as joint spacings and rei n f o r cement re q u i re m e n t s.
Where nonuniform sub grade materials are encountered, steel reinforcement is recommended to control slab cracking. This is especially true for superflat industrial floors and areas susceptible to expansive soil. Designing floor slabs on grade stepbystep procedures. Discusses a variety of slab types and different loading. Flat slab analysis, design and detailing pdf civil engineering. The most common posttensioning material is halfinch diameter 270k prestressing strand. Designing floor slabs on grade free ebook download as pdf file. The presence of rebar or wwf in a slab on grade increases confidence in the ability of the slab to. Discusses a variety of slab types and different loading and support conditions. 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. Finally, since shear reinforcement is not used in oneway slabs, the concrete must be able to. Should i install a poly ethylene vapor barrier or vapor retarder underneath the whole slab.
Posttensioning is very popular for slabongrade construction in some areas of the country. For example, the minimum slab thickness for a twohour fire rating is 4. Reinforcing is added to control shrinkage cracking and maximize the distance between designed joints. A civil engineer must know all the aspects regarding the flat floor system. The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length. I am trying to find a copy of the ringoandersons book designing floor slabs on grade either in hardcopy or pdf format. Improve comfort and save energy in homes with slabongrade floors office of building technology, state and community programs energy efficiency and renewable energy u. In general, a slab on grade strength is largely dependent on the quality of the soil beneath it. Grdslab is a spreadsheet program written in msexcel for the purpose of analysis of concrete slabs on grade. Reinforced concrete design 1 design of slab examples. Heavy loads in building s such as warehouses include moving load s, stationary live loads, and wall loads. Your uniform load of 100 psf will generate only minimal flexural stresses in the concrete, largely due to irregularities of the slab thickness and non uniform compaction of the soil beneath it. Even with the best slab designs and proper construction, it is unrealistic to expect crackfree and curlfree floors. Grdslab concrete slab on grade analysis spreadsheet.
Oct 28, 2019 building matters minimizing concrete in a slab on grade home whether your goal is to cut construction costs, minimize environmental impact, or both, there are practical ways to build a home with less concrete. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. Much investigation should go into the service conditions intended. Design concrete slab on grade concrete engineering. Ce 403, fall 20 oneway slab design 3 4 aci 31811 referenced pp 2 4 rating. Design includes all of the decisions, specifications, and details made and documented before construction can begin. I have a cottage that is being replaced by a retirement home. Department of energy buildings for the 21st century buildings that are more energyefficient, comfortable, and affordablethats the goal of does office of building. Pdf this article presents a methodology for designing slabs on grade for industrial floors where there is an eccentricity between the slab centroid. The article explains the development a method to design. The design procedure set forth in that publication had at that time been in use by the author for about 15 years. Thickened edges add more restraint to drying shrinkage and cost more. This comprehensive book will help you select the most costeffective approach to achieve highperformance concrete floors. This strip is designed basically as if it were a 12inchwide beam, t inches thick.