Pdf flat slabs are highly versatile elements widely used in construction, providing minimum depth, fast construction and allowing flexible. Concrete is good in taking compression and steel is good in tension. Twoway flat plate concrete slab floor analysis and design aci 31814. A floor slab in a building where stability is provided by shear walls in one direction ns. Shear reinforcement to check if shear reinforcement and which system can be used, one can. The formwork for slab can be recycled with repetition in floor layout.
Aci 318 code gives minimum slab thickness for twoway construction without interior beams in table 8. Advantages and disadvantages of flat slabs civil engineering. Flat slab sized for punching shear and deflection additional reinforcement added to span steel to reduce deflections typically 25% extra on a 7. Scdot standard specifications for highway construction edition of 2000. This manual describes the algorithms used for the various codes. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Pub cs140 guide to flat slab formwork and falsework publication year 2003 document status latest version of document. It is fruitful in case of reduced building height, decreased cladding expense and prefabricated services. Introduction currently the flat slab system is widely used in construction because of architectural flexibility, more clear space. The use of flat slab building provides many advantages over conventional rc frame building in terms of architectural flexibility, use of space, easier formwork and shorter construction time.
Flat slab seminar report, ppt, pdf for civil engineering. Flat slab analysis and design free version download for pc. Yan and others published hybrid steel tubular columnflat slab construction development of a shearhead system. The benefits of choosing flat slabs include a minimum depth solution, speed of construction, flexibility in the plan layout both in terms of the shape and column layout, a flat soffit clean finishes and freedom of layout of services and scope and space for.
The construction and design of concrete slabs on grade. The analysis and design follow the equivalent frame analysis method of the aci code, which considers a onebay wide strip of the floor system as a continuous frame. Flat slab construction can greatly decrease floorto floor height particularly where there is no false ceiling because flat slab construction does behave as limiting factor on the disposition of horizontal services and partitions. Flat slabs are considered suitable for most of the construction and for asymmetrical column layouts like floors with curved shapes and ramps etc. Floors, have been at the forefront of the effort to provide the industry with the tools to produce slabs that are flat and level, with a densely finished surface, stable joints, and limited cracking while. Abstract explains the procedural and technical aspects of the formwork, falsework and striking operations for constructing fiat slab in situ concrete buildings. Seismic analysis of flat slab by using etabs international journal. Flat slab analysis, design and detailing pdf civil.
Simplified reliability analysis of punching in reinforced concrete flat. Flat slabs are preferred in multistory construction due to its economical and architectural benefits. For many years, ciria report 110 has been the standard document for the design of reinforced concrete flat slabs. For spans over 9 m posttensioning should be considered. Flat slabs are particularly appropriate for areas where tops of partitions need to be sealed to the slab soffit for acoustic or fire reasons.
For spans from 5 to 9 m, thin flat slabs are the preferred solution for the construction of insitu concrete frame buildings where a square or nearsquare grid is used. Five different models conventional slab, flat slab, flat slab with drops, flat slab with column head and flat slab with. It is the design strip having a width of l 2 4, where l 2 is the span transverse to l 1. This can prove gainful in case of lower building height, decreased cladding expense and prefabricated services. Effect of premature loading on punching resistance of reinforced. Two way flat slab systemmore economical than one way system in building with bays that are square or nearly square proportion. 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. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Sachpazis date 18012014 chkd by date appd by 4 internal column c3 consider the reinforcement concentrated in half width strip over the support depth of reinforcement.
It should be noted that astm standards are minimum. Liftslab construction is a precast method of construction of slab on the ground and then lifting it to the structure. Introduction concrete slabs on grade are a very common type of concrete construction. Stock photos by zimin 0 0 large granite slab stock photography by andreevaee 1 38 necklace from polished faceted amber flat pieces stock photos by vvoennyy 0 0 coiled. Reinforcement options will be covered in the following slides. This can prove gainful in case of lower building height, decreased cladding expense and pre. Strengthening of reinforced concrete flat slabs using cfrp can be done in two methods. Eliminating drops results in simpler falsework and formwork arrangements. In flat slab construction, the slab is sometimes thickened around the column as shown in figure 1. Look to appendix a to view adoss rebar suggestions and. Site cast flat slab construction one way solid slab systemsupport by bearing walls or beams. Although flat slabs have been in construction for more than a. Explore flat slab with free download of seminar report and ppt in pdf and doc format.
Pdf hybrid steel tubular columnflat slab construction. Nbs chorus intelligent construction specification, in the cloud. Cost comparison between conventional and flat slab structures. Flat slabs are appropriate for most floor situations and also for irregular column layouts, curved floor shapes, ramps etc. Hw 8 post tensioned flat slab university of alabama. Varying conditions and stipulations ask for the selection of appropriate and costeffective concrete slab, keeping in view, the type of building, architectural layout, aesthetic features, and the span length. For to create better shear transfer conditions between slab and column, the perimeter of flat slabs should be designed with. W gene corley aci convention, phoenix, az, sunday october 20, 20. Flat slab construction can deeply reduce floorto floor height especially in the absence of false ceiling as flat slab construction does act as limiting factor on the placement of horizontal services and partitions. This system is similar to the twoway flat plate system except there is a drop panel to provide extra thickness around the columns. The construction and design of concrete slabs on grade d. The main objective of the paper is to study method of analysis and design of flat slab by using aci 318 08 design codes, with matlab programming for the easy application language for the design of flat slab. This is continued construction in operation vid to share with contractors, architects, engineers, students and all interested in buildings and construction. Yan and others published hybrid steel tubular column flat slab construction development of a shearhead system.
Drop can reduce the deflection and assist in the resistance against. The economical span l of a reinforced concrete flat slab is approximately d x 28 for simply supported, d x 32 for an end span and d x 36 for an interior span. The reason why, concrete and steel are used together to construct rcc slab, is in their individual properties as separate building materials and their individual limitation. Slabs and flat slabs lecture 5 19 th october 2016 contents lecture 5 designing for shear in slabs including punching shear detailing solid slabs flat slab design includes flexure worked example exercise punching shear. Concrete slabs, therefore, are further classified into oneway joist slab, flat slab, flat plate, waffle slab, hollow core slab, precast.
Tr 64 guide to the design and construction of reinforced. Pub cs140 guide to flat slab formwork and falsework. Department of mechanics, materials and structures english courses reinforced concrete structures code. Abstract the flat slab system of construction is one in which the beam is used in the conventional methods of construction done. Review paper on behavior of flat slab under dynamic loading ijste volume 2 issue. Flat slabs for efficient concrete construction construct concrete. Chapter 6 construction method for flat plate system. Concrete slab types construction, cost, and applications. Flatslab construction definition is reinforcedconcrete floor construction not requiring beams and girders to transmit the floor load to supporting columns. Beside this, due to shear problems at column heads, the thickness of flat slab is greater. The use of flat slab building provides many advantages over conventional rc frame building in terms. Some case studies showed failure of flat slabs, which were prematurely loaded during the construction process before it reaches its full characteristic strength at. Shorter construction time flat plate design will facilitate the use of big table formwork to increase productivity.
A summary of the rebar is shown in the tables below. Analysis and design of flat slab by aci code with matlab. Roadway widths and geometric layout of prestressed concrete cored slab bridges. Guide to the design and construction of reinforced. How to build a new style foundation build a foundation using readymixed concrete for the house duration. Asce, secb course content slab on grades construction.
A type of precasting used in building construction involves casting floor and roof slabs at or near ground level and lifting them to their final position, hence the name liftslab construction. The rest of the floor can be slightly thinner with less dead weight. Stock photo by alexfiodorov 1 232 pouring concrete mix for road construction workers. The cost of construction for these buildings has also been compared. Hawkins, professor emeritus, university of illinois a tribute to the lasting contributions and legacy of our friend and colleague dr. Review paper on behavior of flat slab under dynamic loading. The principal features of a flat slab floor are a flat soffit, simple formwork and easy construction. The flexibility of flat slab construction can lead to high economy and yet allow the architect great freedom of form. It uses simple formwork arrangement and reinforcing arrangement, and requires the least story height.
For this flat plate slab systems the minimum slab thicknesses per aci 31814 are. Abstract intended to provide information and current best practice on the design and construction of reinforced concrete flat slabs in accordance with eurocode 2 bs en 1992 and the national structural concrete specification. The benefits associated with flat slab construction may well outweigh those of. Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318. Flat slab concrete floor system is similar to the flat plate system. Flat slabs are considered to be faster and more economic than other forms of construction, as partition heads do not need to be cut around downstand beams or ribs. Also explore the seminar topics paper on flat slab with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year 2015 2016. National conference on recent trends in engineering.
The wall and columns are poured before erecting the formwork for one way slab. Instead, the floor is heavily reinforced in both directions. Chapter 6 construction method for flat plate system 6. Manual of concrete inspection was in preparation and. A flat slab is a twoway reinforced concrete slab that usually does not have beams and girders, and the loads are transferred directly to the supporting concrete columns. Analysis and design of flat slab and grid slab and their. These values are based on 2 of construction tolerance, precast structures with 8 walls, and concrete pipe dimensions. The beams reduce the available net clear ceiling height. Twoway flat slab concrete floor with drop panels system. Concrete flat slab structures is a common form of structural reinforced concrete rc construction in buildings, especially in mediumrise offices.
Department of mechanics, materials and structures english. Alternatives to enhance flat slab ductility springerlink. The dissertation commences with a general history background and the advantages of using flat slab as the type of floor construction. Filler slab technology is a simple and a very innovative technology for a slab construction. The standard practice is to thicken it to at least 1. Performance of slabcolumn connections of flat slabs strengthened. Flat slab types of flat slab design and its advantages. Flat roof construction manual materials design applications. The thickness of the slab has to be increased or the slab has to be shear reinforced. Flat slabs are used by engineers in many building due to its advantages over other reinforced concrete floor system in different cases. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete.
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