Flat slab is a reinforced concrete slab supported directly by concrete columns without. These materials are originally located at different websites. Department of mechanics, materials and structures english courses reinforced concrete structures code. A flatslab is a part of the elevated concrete floor systems that can be classified as two parts that they are further divided into several types. Flatslab construction definition is reinforcedconcrete floor construction not requiring beams and girders to transmit the floor load to supporting columns. The construction of flat roofs proved to be difficult from the start. There are many advantages of flat slab such as increased head room, easier flow of mechanical and electrical services, ease in construction of form work, faster construction etc. A floor slab in a building where stability is provided by shear walls in one direction ns. In this article, ill give a detailed explanation of each slab where to use particular slab. Flat plate concrete floor system does not use beams between columns or. Pdf hybrid steel tubular columnflat slab construction. Flat slab structures are the best solution for high rise. Flat slabs can be analysed using the frame equivalent method, or by using the simplified analysis method which involves the use of coefficients. The principal features of a flat slab floor are a flat soffit, simple formwork and easy construction.
Site cast flat slab construction one way solid slab systemsupport by bearing walls or beams. According to the fdots structures manual 2004b, the price of the superstructure on a flat slab bridge is the least per square foot, when compared to other designs used in florida. The paper presents results of research on reinforcedconcrete flat slabs and basic aspects of their construction technology. It is for that reason that the flat roof construction manual focuses on the subject of designing energysaving flat roofs free from damage. A comparison was made between bubbledeck and hollow core deck prior to the construction of weena tower. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. For span from 5 to 9m thin flat slabs are the preferred solution for the construction of in situ concrete frame building, where a square or near square grid is used. Explore flat slab with free download of seminar report and ppt in pdf and doc format. 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 one direction ns. Flat slab is defined as one sided or twosided support system with sheer load of the slab being concentrated on the supporting columns and a. This can prove gainful in case of lower building height, decreased cladding expense and prefabricated services. In towers with repetitive floors, minimizing the additional material and labor required for work at beams and columns provides a real impact on savings both in schedule and cost.
When the imposed load applied to a particular floor slab exceeds its carrying capacity, then. Flat slab analysis, design and detailing pdf civil engineering. Design considerations for reinforced concrete flat slab floor. Some of them are outdated and many of them are frequently used everywhere. Yan and others published hybrid steel tubular column flat slab construction development of a shearhead system. In practice of civil construction precast, precast and castinsitu, and total castinsitu slabs apply.
A civil engineer must know all the aspects regarding the flat floor system. How to estimate the cost of highrise cast in place. A plain ceiling is obtained thus giving attractive appearance from an architectural point of view. Prestressedprecast floridaslabbeams for robust local bridges and accelerated construction steven nolan, p. Guide to the design and construction of reinforced concrete. Concrete slab types construction, cost, and applications. Constructing a roof garden was a special challenge for the architects of modern movement.
Design considerations for reinforced concrete flat slab. Advantages and disadvantages of flat slabs civil engineering. 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. Moreover, the design and construction details of this parking garage are used to illustrate code requirements, flatslab analysis, design details, and the. 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. Flat slab construction definition is reinforcedconcrete floor construction not requiring beams and girders to transmit the floor load to supporting columns. Dec, 2016 flat slab flat slab are also known as beamless slab, is a type of slab in which the flooring slab is directly supported on columns without the agency of beam or girders. Flat slab analysis, design and detailing pdf civil. Flat slab seminar report, ppt, pdf for civil engineering. Economy of construction is obviously an important consideration, but this is a qualitative argument until specific cases are discussed, and is a geographical variable. Prestressedprecast floridaslab beams for robust local. Pdf flat slabs are highly versatile elements widely used in construction, providing minimum depth, fast construction and allowing flexible. Two way flat slab systemmore economical than one way system in building with bays that are square or nearly square proportion. Jul 18, 2014 the principal features of a flat slab floor are a flat soffit, simple formwork and easy construction.
For spans over 9 m posttensioning should be considered. The thickness of slab over columns is also increased to support heavy loads and the thickened part of the slab is called drop panel. Flat slabs are particularly appropriate for areas where tops of partitions need to be sealed to the slab soffit for acoustic or fire reasons. Flat slab types of flat slab design and its advantages. Eliminating drops results in simpler falsework and formwork arrangements. Flat slab flat slab are also known as beamless slab, is a type of slab in which the flooring slab is directly supported on columns without the agency of beam or girders. A waffle flat slab is equivalent to a two way joist system or may be visualized as a solid slab, and they are used to decrease the weight of slab. Flat slabs can be analysed using the frame equivalent method, or by using the simplified.
The noise reduction with bubbledeck was 1 db higher than hollow core. Pdf cost optimisation of reinforced concrete flat slab. Jan 22, 2019 house construction roof construction with concrete plant excellent roof construction techniques duration. A civil engineer should study these lectures and materials for structural engineering acumen. In flat plate system, construction of large span is not possible.
Flat slab sized for punching shear and deflection additional reinforcement added to span steel to reduce deflections typically 25% extra on a 7. General this handout discusses the effect of load transfer between floors in multi storey construction, where the maximum thickness of reinforced concrete floor slab does not exceed 350mm. Aug 27, 2015 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. This can prove gainful in case of lower building height, decreased cladding expense and pre. Flat slab system is an important division of concrete floor system. 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. A flat slab can also be refers to as beamless slab, it is a reinforced concrete slab supported directly by concrete columns without the use of beams. The wall and columns are poured before erecting the formwork for one way slab. 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. The rest of the floor can be slightly thinner with less dead weight. Pvc215 corner seal waterstop, ideal for flat slab work.
House construction roof construction with concrete plant excellent roof construction techniques duration. The objective function is the total cost of the building including the. Flat slab types, uses, advantages and disadvantages. The best flat slab analysis, design and detailing related pdf and slides are provided here altogether. Use of big table framework helps to reduce construction. Nancy debora assistant professor civil karunya university 2. Flat slab, shear wall, linear dynamic analysis, base shear, time period, story drift, storey displacement 1 introduction from last two decades there is a high increase in the high rise buildings and modern trend is towards high rise. Moreover, the design and construction details of this parking garage are used to illustrate code requirements, flat slab analysis, design details, and the construction of gfrprc flat slabs. Design and construction of reinforced concrete flat slabs. Flat slab bridges consist of prestressed, precast concrete deck panels that span from bent to bent. 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. Similar to ordinary twoway waffle slabs, lightweight concrete. For to create better shear transfer conditions between slab and column, the perimeter of flat slabs should be designed with. Fuchs united states patent f 3,435,572 flat slab construction samuel j.
Slabs and flat slabs lecture 5 19 th october 2017 contents lecture 5 designing for shear in slabs including punching shear detailing solid slabs flat slab design includes flexure worked example exercise punching shear. Waffle flat slabs have a square grid of closely spaced joists with filler panels over the columns. However, in terms of labor in building the floor, the flat plate is much cheaper because of the very simple formwork and less complex arrangement of steel. The behaviour and response of flat slab and post tensioned flat slab during earthquake is an important aspect which needs to be explored.
Department of mechanics, materials and structures english. There are 16 different types of slabs in construction. Backpropping flat slabs by peter pallett bsc eng fice fcs 1. 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. Beside this, due to shear problems at column heads, the thickness of flat slab is greater. Flat slab construction offers considerable flexibility to the occupier who can easily alter internal layouts to accommodate changes in the use of the structure. Flat slab analysis and design pdf flat slab design pdf 1. How to estimate the cost of highrise cast in place flat. The slab is without drops and is supported internally and on the external long sides by square columns.
Guide to the design and construction of reinforced. The flat roof with a minimum slope of about 3% had to fulfill three functions. Flat slab types, uses, advantages and disadvantages what is flat slab. Structural design of flat slabs to eurocode 2 structville. A flat slab is a part of the elevated concrete floor systems that can be classified as two parts that they are further divided into several types. 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. Flat slab concrete is a structural system used to minimize beams and column capitals.
Twoway flat plate concrete floor system analysis and design the concrete floor slab system shown below is for an intermediate floor to be designed considering partition weight 20 psf, and unfactored live load 40 psf. Flat slab is an rcc slab built monolithically with supporting columns and reinforced in two or more directions. The flat slab is somewhat more expensive in labor than is the flat plate, but the forms for the column. Design considerations for reinforced concrete flat slab floor system harshal deshpande1, radhika joshi2. The system still used todaywhich divides the bays between columns into column strips and middle strips and uses only an orthogonal arrangement of barswas devised in. Flat slab structure leads to economic saving, aesthetic view and yet allow the architect from great freedom of form works as compared to conventional slab structure. 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. Cost optimisation of reinforced concrete flat slab buildings according to the british code of practice bs8110 is presented. This system is similar to the twoway flat plate system except there is a drop panel to provide extra thickness around the columns.