Figure 1 figure 1 visual representation of a composite slab reinforced concrete itself is a composite material. Design of various types of slabs and their reinforcement. 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. Foundation repair experts know how fix inferior concrete slabs and will want to examine your foundation for signs of deterioration. A civil engineer must know all the aspects regarding the flat floor system. It is only aapplicable to ductile underreinforced slabs since we.
Download design of reinforced concrete structures by n. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. However, this is not the only means of reinforcing slabs. After this publication, it was subsequently adopted by the uniform building. Slab cast integrally with a series of closely spaced joist which in turn are supported by a set of beams. Two simplified methods are presented here, hand calculations based on. Reinforced concrete, slab, beam, explosion, impulse load, dynamic. Slabs of uniform thickness bending and reinforced in two directions and supported directly by columns without beams. Flat slab analysis, design and detailing pdf civil engineering. Once grasped yield line design is an exceedingly powerful design tool. Twoway concrete floor slab with beams design and detailing design the slab system shown in figure 1 for an intermediate floor where the story height 12 ft, column crosssectional dimensions 18 in. The slab may be supported by walls or by reinforced concrete beams usually cast monolithically with the slab or by structural steel beams or by columns, or by the ground. The construction and design of concrete slabs on grade.
Typical forms of shear connection in composite slabs a c b d a mechanical interlock through the provision of indentations or embossments rolled into the profile. I am looking for a guide to design slabsonground for a building, which aci document should i use. Mar, 20 title slide of design of reinforced flat slabs to bs 8110 ciria 110 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. It explains the yield line method of analysis and hillerborgs strip method of design, and discusses the basic north american and british practices.
Punching of flat slabs design for shear at th e column heads 12. However, flat slabs have a lower stiffness in comparison to a beamcolumn floor plan which can lead to relatively large deflections. Rcc slab design depends on the on the dimensions of the slab after which the slab is termed as a oneway slab or a twoway slab in the design of rcc structures, column design and beam design are to be done before we start with rcc slab design basic rules followed in the design of simply supported slab. Is 456 provides guidance to calculate effective span. Practical yield line design 4 yield line design is a robust and proven design technique. Composite slabs consist of profiled steel decking with an insitu reinforced concrete topping. Structural steel composite slab 1 of 7 rev design project. It provides a working flat surface or a covering shelter in buildings. The design procedure set forth in that publication had at that time been in use by the author for about 15 years. It addresses the planning, design, and detailing of slabs. Ribbed slabs oneway joists introducing voids to the soffit of a slab reduces dead weight and increases the efficiency of the concrete section.
Standard for the structural design of composite slabs and standard practice for construction and inspection of composite slabs establishes standards for the structural design and testing of composite slabs and for good construction practice and inspection procedures. Just call hd foundations for a free inspection and ask us to examine your foundation design, or schedule a. In twoway slabs shorter direction strip carry greater %age of load. Standard ansiasce 391 covers loads, construction stage, strength design, service load design, test procedures, and. For slabs spanning in both directions published tables and charts should be used to find bending moment and shear per unit width of slab. Various types of rcc slabs civil engineering projects. If you continue browsing the site, you agree to the use of cookies on this website. Asce, secb course content slab on grades construction. Composite slab worked example 1 made by sssr date 140500 structural steel design project. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. In addition to this, the shear capacity can also be reduced in particular around the column head where large shear forces can develop. Aci 360, design of slabsongrade, refers to this as a type b slab. Reinforced concrete slab design and detailing guide is456. Slabs are usually used in floor and roof construction.
Reinforced concrete slab design using the empirical method. Pdf design of reinforced concrete slabs ninos dinkha. Background of simple design method 12 membrane forces along yield lines 2 simple design method of reinforced concrete slabs at 20 c k,b are parameters defining magnitude of membrane forces, n is a factor deduced from yield line theory, k is the ratio of the reinforcement in the shorter span to the reinforcement in the longer span. The design of sections, however, should be conducted according to sectio n 8. Department of mechanics, materials and structures english. Theoretical background for current analytical procedures and design aids geotechnical considerations for supporting base and subgrade. It became popular in the early 1900 in the usa for the first skyscrapers because it is lighter and cheaper than solid steel elements. This guide presents information on the design of slabs onground, primarily industrial floors. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Design of reinforced flat slabs to bs 8110 ciria 110. Flat plate strength is often governed by shear strength at the columns, and for service live loads greater than perhaps 100 lbft2 4. The construction and design of concrete slabs on grade d.
General a slab is a flat two dimensional planar structural element having thickness small compared to its other two dimensions. Analysis of flat sanalysis of flat sllabab moment division example 6000 6000 6000 6000 6000 5000 layout of building 7000 5000 a floor slab in a building where stability is provided by shear walls. In some cases deformed bars are used in order to assure that the reinforcement is placed at the correct depth within the slab and not damaged during placement. Subramanian designed to meet the needs of students aspiring to enroll into the undergraduate civil and structural engineering programs, design of reinforced concrete structures has been proven to be useful for postgraduate students as well as an indispensable reference for practicing engineers and researchers. Just call hd foundations for a free inspection and ask us to examine your foundation design, or schedule a free online estimate.
Following are the rcc slab design and detailing guidelines. Because of the brittle nature of shear failures, conservative design is necessary. Twoway concrete slab with beams spanning between supports. May 21, 2017 slabs are constructed to provide flat surfaces, usually horizontal in building floors, roofs, bridges, and other types of structures. The decking not only acts as permanent formwork to the concrete, but also provides sufficient shear bond with the concrete so that, when the concrete has gained strength, the two materials act together compositely.
L center to center distance between the support b depth of slab. Apr 22, 2014 foundation repair experts know how fix inferior concrete slabs and will want to examine your foundation for signs of deterioration. Design of flat slab with matlab article pdf available in international journal of engineering research 53. Flat slab system is an important division of concrete floor system. C 5 is the slope correction coefficient co is the consolidation correction coefficient as an example. A comparative design of reinforced concrete solid slab. Standard for the structural design of composite slabs and. It is closely related to the plastic collapse or limit analysis of steel frames, and is an upper bound or mechanism approach. Nowadays approximately 40% of all new multi storey buildings fig. Flat slab analysis, design and detailing pdf civil. Introduction concrete slabs on grade are a very common type of concrete construction. 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. Different types of shear reinforcement used at column heads. Design of reinforced concrete slab with regard to explosions.
Designed as a series of parallel tbeams and economical for medium spans with light to medium live loads. Analysis and design of slabs two way civil engineers pk. The elastoplastic analysis for the slabs needs to be modified to receive relatively acceptable results, this modification is described in the thesis. Title slide of design of reinforced flat slabs to bs 8110 ciria 110 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. The most common reinforcement associated with slabs ongrade is welded wire fabric. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. The saving of materials tends to be offset by some. Standard for the structural design of composite slabs and standard practice for construction and inspection of composite slabs asce ansiasce 391 and 991 isbn print. It is a versatile tool that challenges designers to use judgement. A finite element model may be created to analyse a complicated loading arrangement. A slightly deeper section is required but these stiffer floors facilitate longer spans and provision of holes. Effective span first step is know the effective span for analysis and design effective span needed for calculation of moments, shear forces, etc.
Effective span of slab shall be lesser of the two 1. For beamless slabs, the choice between a flat slab and a flat plate is usually a matter of loading and span. Background information on design theories is followed by discussion of the types of slabs, soilsupport systems, loadings, and jointing. Foundation design concrete slabs hd foundations, inc. A concrete slab running on a bridge when a slab s length is more than twice its width l 2w then the slab can be considered a oneway slab. These materials are originally located at different websites. Introduction to flat slabs modelling of reinforced. In high rises buildings and skyscrapers, thinner, precast concrete slabs are slung between the steel frames to form the floors and ceilings on each level. A comparative design of reinforced concrete solid slab bridge. Twoway slabs have two way bending unlike oneway slab. Download as pptx, pdf, txt or read online from scribd.
While making structural drawings of the reinforced concrete slab, the slabs are abbreviated to r. Economy of construction is obviously an important consideration, but this is a qualitative argument until specific cases are discussed, and is a geographical variable. Able to carry heavier loads and span longer than ribbed slabs. The composite slabs in question consist of profiled steel decking with reinforced concrete on top. Yield line design demands familiarity with failure patterns, i. Concrete slabs on grade are a component of almost every construction project, yet their design and detailing requirements are rarely included in the undergraduate engineering education. Reinforced concrete slab design using the empirical method bridgesight solutions for the aashto lrfd bridge design specifications bridgesight software tm creators of effective and reliable solutions for the worlds bridge engineers. Sep 03, 2011 design of reinforced concrete slabs 107 b 1. Analysis and design crc press book this book provides an uptodate description of the latest procedures for analysis and design of reinforced concrete slabs. Pro computer software compares very close to manual design. Guide to design of simply supported slabs design of rcc.
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