Comparative study of flat slab with old traditional two. Equivalent frame method, load balancing, flat slab, post tension, safe design, rcc. Not as nice looking as brickwork flat roof pitched roof in conclusion i believe the masonry wall to be the most appropriate for the builder. Constructing a roof garden was a special challenge for the architects of modern movement. Shear concept explained and flat plate example csa a23. Generally pt flat slab requires approximately 20 to 35kgm3 of steel compared to that of rcc slabs 80 to 120 kgm3. Design of flat slab with edge beams by direct design method 16 14 14 3 b c 1 c 2 c 3 c 4 3 1 c 5 c 6 c 7 c 8 c 9 14 c 10 11 c c 12 c c 14 c 15 c 16 8 c 17 c 18 c 19 c 20 8. Peripheral mill cuter is used for performing the slab milling operation. Advantages and disadvantages of flat slabs civil engineering. Explore flat slab with free download of seminar report and ppt in pdf and doc format. A study of flat plate slab column connections with shear plate.
A study of flat plate slab column connections with shear. In conventional slabbeam system, the load is transferred from slab to beam and ultimately beam to the column. 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. 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. Both the systems are analyzed using rapt and etabs respectively which is based on the design methodology. The speed of construction for such slab is faster compared to conventional slab. The behaviour and response of flat slab and post tensioned flat slab during earthquake is an important aspect which needs to be explored. Pdf flat slab system is becoming widely popular for multistorey buildings due to its several advantages. These materials are originally located at different websites.
Plain or the slab milling is a process in which the plain, horizontal or flat surfaces are produced, which are parallel to the axis of the rotation of the cutter. This caused tensions within the construction with the changes of temperature and led to cracks as a result. The advantages of standardization in manufacturing are cost effectiveness and integration. Such type of decks has the following advantages over other type of superstructures. Flat slabs are capable to carry concentrated loads. What are the advantages and disadvantages between post. Beside this, due to shear problems at column heads, the thickness of flat slab is greater.
The load is transferred directly from slab to column in the flat slab. The benefits of using insitu concrete flat slab construction should be. The drop panels play a significant role here as they augment the overall capacity and sturdiness of the flooring system beneath the vertical loads thereby boosting. Earlier stripping of shuttering posttensioned slab would be ready for stressing operation when concrete strength achieves 28 nmm2. 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. Flat slab system is an important division of concrete floor system. The remaining 18% is the material and placing cost of the mild reinforcement. In this study fe analysis of flat slabs is proposed. Twoway joist concrete slab floor waffle slab system analysis and design design the concrete floor slab system shown below for an intermediate floor with partition weight of 50 psf, and unfactored live load of 100 psf. A flat slab with prestressing tendons pt results in longer spans and thinner slabs.
A flat slab belongs to a oneway or twoway method that is condensed in the slab at the columns and load bearing walls known as drop panels. Guidelines for a twoway concrete flooring system brewer. Eebrik 3a discussed about flatslab rc buildings exhibit several advantages over conventional moment resisting frames. Flat slab types of flat slab design and its advantages flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams. Flat slab types, uses, advantages and disadvantages. Post tension slab although concrete is a strong material for construction, it is not resistant to breakdown especially where longer concrete slabs are required like in a bridge or a length of a beam. For this, the concrete slab is tensioned with a process called prestressing and the slab of concrete which comes out after this process is known. Fast and easy construction disadvantages of flat slab system concrete slabs are one of the most. The benefits associated with flat slab construction may well outweigh those of other structural solutions, which could be more complicated, timeconsuming and ultimately more costly. If the flat plate system is prestressed, the span l can change to d x 30, dx 37 and d x 40 respectively. The flat roof with a minimum slope of about 3% had to fulfill three functions. Comparison of oneway and two way slab behavior economic choices flat plate suitable span 20 to 25 ft with ll 60 100 psf advantages low cost formwork exposed flat ceilings fast disadvantages low shear capacity low stiffness notable deflection. They increase the shear capacity and the stiffness of the floor system under vertical loads, thus increasing the economical span range. Post tension slab advantages and disadvantages of post.
Flat slab definition disadvantages flat slab benefits of. Flat slab with drop panels conventional rc or pt drop panels, formed by thickening the bottom of the slab around columns, increase shear capacity and the stiffness of the slab, allowing thinner slabs to be used. Standardization of lathe cutting tool stock sizes and tool post mounts for instance allow tool post. Comparative study of reinforced concrete flat slabs with. 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. Twoway joist concrete slab floor waffle slab system. It uses 30% less concrete and 20% less steel than a raft slab. However the structural effectiveness of flatslab construction is hindered by its alleged inferior. Analysis of flat sanalysis of flat sllabab column head l. A civil engineer must know all the aspects regarding the flat floor system.
Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. A flat plate is a one or twoway system usually supported directly on columns or load bearing walls. The use of zero beams helps to have underfloor spaces and more service areas. Because of the brittle nature of shear failures, conservative design is necessary. 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. A flat plate floor system does not demand any beam. Jun 21, 2018 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 square slab called drop panels. Comparative study of reinforced concrete flat slabs with and. On average, the formwork costs for flat plates represent approximately 46% of the total floor cost. Its not like a flat slab which is here and there i. The benefits of using insitu concrete flat slab construction should be investigated at the conceptual design stage.
Study on flat slab and conventional slab mitan kathrotiya1 dr. Advantages of flatslab reinforced concrete structures are widely known but there are also known the disadvantages concerning their earthquake resistance. Nov 20, 2014 openingsanalysis analysis of flat slab for all other cases of openings, it should be framed on all sides with beams to carry the loads to the columns. Flat slab analysis, design and detailing pdf civil engineering. The flat plate is a twoway reinforced concrete framing system utilizing a slab of uniform thickness, the simplest of structural shapes. 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. They improve the shear capacity and the rigidity of the floor system below vertical loads, which consequently enhance the economical span range. Advantages disadvantages they come pre made so saves time building the timber will rot over time they are light so less concrete required in foundations. Department of mechanics, materials and structures english. Openingsanalysis analysis of flat slab for all other cases of openings, it should be framed on all sides with beams to carry the loads to the columns. Posttensioning provides high strength and stability, but looks just. Advantages and disadvantages of flat slabs and standard column beam slabs free download as word doc.
The basic advantages of a flat plate floor system are. Utracon structural systems advantages of post tensioning. Flat slabs are mostly used in large industrial structures, parking garages, ramps, warehouse, high rise buildings and hotels. Flat slab types, uses, advantages and disadvantages daily civil. Flat slab analysis, design and detailing pdf civil. For a concrete grade of 35 nmm2, this normally happens on the 5th day after concreting. Posttension concrete is a method of reinforcing concrete. Abstract recently, flat slab buildings are commonly used for the construction because use of flat slab building provides many advantages over conventional rc frame building in terms of economical, use of space, easier formwork, architectural flexibility and importantly shorter construction time. Jan 15, 2018 contents advantages of flat slab system 1. C slab built monolithically with the supporting columns and reinforced in two or more directions. Salunke mgms college of engineering and technology, kamothe, india mgms college of engineering and technology, kamothe, india abstract the use of posttensioned flat slab is increasing day by day, due to its advantages over traditional concrete. Jul 28, 2014 the flat plate is a twoway reinforced concrete framing system utilizing a slab of uniform thickness, the simplest of structural shapes. 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 square. A flat slab is a oneway or twoway system with thickenings in the slab at the columns and load bearing walls called drop panels figure 9.
The lateral loads are independently resisted by shear walls. A study of flat plate slab column connections with shear plate in tall concrete building using experimental and numerical analysis young s. Flat slab types of flat slab design and its advantages. They are also used where uses of beams are not required.
Flat slab definition disadvantages flat slab benefits. Jan 24, 2015 post tension slab although concrete is a strong material for construction, it is not resistant to breakdown especially where longer concrete slabs are required like in a bridge or a length of a beam. No beamssimplifying underfloor services outside the drops. It is one of the most common forms of construction of floors in buildings. Waffle slab purpose, uses, advantages and disadvantages. Flat slab seminar report, ppt, pdf for civil engineering.
Among these are a shallower depth for the same deflection, quicker stripping of. Flat slab is a reinforced concrete slab supported directly by concrete columns. Here is a table below showing the advantages of slab foundations and the disadvantages of slab foundations to provide a clear idea about the topic. This concrete has cable conduits cast into it and that cable is stretched, or tensioned, hydraulically after the concrete has hardened. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. Nancy debora assistant professor civil karunya university 2. The tension is transferred to the concrete, helping hold it together even better. Comparative study of post tensioned and rcc flat slab in. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. 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 square slab called drop panels. Concrete material, placing, and finishing account for about 36% of the cost. Flat slab system the flat slab is similar to the flat plate, but has thickened portions. Waffle slabs provide stiffer and lighter slabs than an equivalent flat slab.
There are many pros and cons of using slab foundations. Design of flat slab with edge beams by direct design method 16 14 14 3 b c 1 c 2 c 3 c 4 3 1 c 5 c 6 c 7 c 8 c 9 14 c. In frankfurt settlements flat roof was also covered with metal sheets on shuttering above wooden beams as well as on insitu concrete slabs. Advantages and disadvantages of flat slabs and standard column. For further study download reinforced concrete designers handbook pdf.
A plain ceiling is obtained thus giving attractive appearance from an architectural point of view. Flat slab type advantages disadvantages slab tutorials. The construction of flat roofs proved to be difficult from the start. Analysis of posttensioned flat slab by using safe shriraj s.591 1026 431 1330 1125 1214 1346 846 821 89 1016 1313 542 1336 294 852 499 973 1093 542 1442 756 979 785 1465 1455 347 142 269 1051 1527 1581 656 291 1548 376 996 1294 396 588 278 940 1284 831 506