Design methods are given for unreinforced concrete, reinforced concrete, shrinkagecompensating concrete, posttensioned concrete, fiber reinforced concrete slabs onground, and slabs onground in refrigerated buildings, followed by information on shrinkage and curling. Concrete floor slabs on grade are subjected to a variety of loads and loading conditions. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. 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. Find the following parameters for design moments in step 2 per unit width step 4 note. Concrete slab rest ing on grade cont aining steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars. 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. Guide to the design and construction of reinforced. Reinforced concrete sk 33 section through slab showing stress due to moment. The reader is referred to tek 311, concrete masonry basement wall construction, tek 193b, preventing water penetration in below grade concrete masonry walls and ncmas basement manual for more detailed design and construction information refs.
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 industrial floors lund university publications. Dhang, department of civil engineering, iit kharagpur. Reinforced and prestressed concrete are used extensively in bridge projects. 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. An increased use of steel fibre reinforced concrete sfrc slabs on grade demands improved design tools. The most common reinforcement associated with slabsongrade is welded wire fabric. The overall tendency is to shrink and this can cause cracking at an early age. Both slab on grade and structural slabs can be created using this formwork.
Download design of reinforced concrete textbook by civilenggforall in pdf format useful for the students preparing for gate, ies, semester exams. Reinforcing steel in slabs on grade concrete construction. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Residual strength estimator for fiber reinforced concrete overlays. The swedish concrete association has proposed a design method for sfrc slabs. Slab thickness design for industrial concrete floors on grade. Practice oriented papers and articles on reinforcing slab on grade sp33906. Chapter 8 design of posttensioned slabs on grade, pg. The construction and design of concrete slabs on grade d.
Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Manual for design and detailing of reinforced concrete to. Manual for design and detailings of reinforced concrete to. The structural design of a concrete floor slab on grade is primarily controlled by the. Cip 6 joints in concrete slabs on grade what are joints. Pdf reinforced concrete design by s unnikrishna pillai. The usefulness of fiber reinforced concrete frc in various civil engineering applications is indisputable. Analysis of concrete slabs on grade spreadsheet grdslab is a spreadsheet program written in msexcel for the purpose of analysis of concrete slabs on grade. Design example of punching shear in slabs eurocode 2. Analysis of concrete slabs on grade spreadsheetdownload free. Guide to the design and construction of reinforced concrete flat slabs contents membersof the projectsteeringgroup list of tables vii iv list of figures v 1.
The design procedure includes determining slab thickness based. Slab thickness design for industrial concrete floors on grade is195. Concrete floor slabs on grade are subjected to a varie ty of loads and loading conditions. Between 19261927, westergaard developed the first rigorous theoretkal analysis of the structural behavior of concrete slab on grade.
Aci 360r10 guide to design of slabsonground american. Pdf a new method for designing floor slabs on grade due to the. Reinforced concrete buildings series design booklet rcb2. Design of slab for flexure 067 m unit width of slab. Reinforcement for slabs on ground concrete construction. The shear area of concrete is entered as input to some computer programs when the analysis is required to take into account the deformations due to shear. The slab has to carry a distributed permanent action of 1. Fiber reinforced concrete has so far been successfully used in slabs on grade.
There is a nominal strength that is reduced by a factor which must exceed the factored design stress. Introduction concrete slabs on grade are a very common type of concrete construction. The construction and design of concrete slabs on grade. Development of a design manual for concrete floor slabs on grade. Foundations come in many types, and each one has its strengths and weaknesses. Calculators for structural engineers, construction professionals and steel building specifiers. Lecture series on design of reinforced concrete structures by prof. Irregular cracks are unsightly and difficult to maintain but generally do not affect the integrity of concrete. Powered by a sophisticated fem solver increasing capacity and substantially speeding up solution for large and complex models, spmats v8. The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length. A new method for designing floor slabs on grade due to the. Reinforced concrete design 1 design of slab examples and. The primary design issues for stiffened slabs on grade are the sizing of the beams. Design methods are given for unreinforced concrete, reinforced concrete, shrinkagecompensating concrete, posttensioned concrete, fiber reinforced concrete slabs onground, and slabs onground in refrigerated buildings, followed by information on shrinkage and curling problems.
Concrete slab on grade analysis calculator for post or. For more critical slabs, evaluation may involve a sitespecific evaluation by a professional engineer. Tm 580912 concrete floor slabs on grade subjected to. The structurally reinforced slab on grade, engineeringdatareportno. Pdf aci 360r92 design of slabs on grade reported by aci. The recommendations derived from these and other studies vary from extremely light to extremely heavy. Special considerations are required for problem soil such as. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Manual for design and detailings of reinforced concrete to code of practice for structural use of concrete 2004 housing department. Review the significant findings of macrofiber addition to concrete slabs on grade, which include the increase in plain concrete slab capacity, reduction in crack widths, and increase in pavement performance. Concrete slab design procedure7 design of continuous slab basics of reinforced concrete slab design slabs are generally designed on the assumption that they consists of. Subgrade for concrete slabs is the natural ground, which is typically prepared by grading and compaction. Concrete slab on grade analysis the engineering community. Bui lding code requirements for reinforced concrete, and commentary on building code requirementsforre inforcedconcrete,ac.
Design methods are given for plain concrete, reinforced concrete, shrinkage compensating concrete, and post chapter 3soil support systems for slabs on. In addition to general design guidance and information on detailing practices, this section contains three design examples. Pdf design of steel fibre reinforced concrete slabs on. In ordinary jointed floors, steel fibers provide a safety net by limiting the width of any cracks that occur, by accident, between the joints. How to design a concrete slab on grade duane craig pin share tweet share email a foundation is an extremely critical part of the building. As 3600 design august 2000 reinforced concrete buildings. Fiber reinforced concrete overview for concrete pavement. Regardless of the intended purpose of the reinforcement, it must be structurally s t i f f to support workers placing concrete or widely spaced so workers can step between bars or wires.
Design methods are given for plain concrete, reinforced concrete, shrinkagecompensating concrete, and post chapter 3soil support systems for slabs on. The design procedure includes determini ng slab thickness based. 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. This study prepared a design manual for concrete slabs on grade subjected to moderate tu heavy loads. Asce, secb course content slab on grades construction.
Guide to reinforced concrete design crack control of slabs part 1. 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. Steel fiber reinforcement for ground supported slabs cfs 1002 fibers steel fibers can help control random cracks in groundsupported concrete floors. The designer might either choose a method based on uncracked concrete or one based on cracked concrete. Aci 360, design of slabs on grade, refers to this as a type b slab. Analysis and design of reinforced castinplace concrete diaphragms. Specifically, a concrete slab on grade may be subjected to concentrated post or wheel loading. Furthermore, the steel must be supported at the proper position in the slab. Reinforced concrete design 1 design of slab examples. Design and investigation of concrete foundations, mats, combined footings, pile caps, slabs on grade.
It was concluded that designing plain concrete slabs. Concrete slab resting on grade containing steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars. Manual for design and detailing of reinforced concrete to september 20 the code of practice for structural use of concrete 20 contents 1. Concrete expands and shrinks with changes in moisture and temperature.
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