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CVEN90016 Design of Reinforced Concrete Flat Slabs

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University Of Melbourne

   

Design of Reinforced Concrete Flat Slabs (CVEN90016)

   

Added on  2020-05-08

CVEN90016 Design of Reinforced Concrete Flat Slabs

   

University Of Melbourne

   

Design of Reinforced Concrete Flat Slabs (CVEN90016)

   Added on 2020-05-08

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DESIGN OF REINFORCED CONCRETE FLAT SLABSFLAT SLABA Flat slab is nothing but a reinforced concrete slab without protruding beam structuressupported only by Concrete columns. Flat slab may be a one way or a two-way slab with shearreinforcement equally distributed across the slab. The columns are often attached to the bottomof the flat slab by using drop panels. These drop panels equally distribute the load of the flat slabto the columns. The height of the drop panels is twice that of the height the slab. Flat Slab – Types of Flat Slab DesignFlat slab slabs have gained utmost significance at the construction of floors with designedshapes especially for specific architectural reasons. The most important advantage of using flatslabs is that it can reduce the protruding beam depth and also flexibility in the floor layout. Thebenefit of using flat slabs in construction process is that it is generally easy for installation andreduces the construction time. The important factors to be considered while designing flat slabs is as follows:The procedure must be very much correlated to the design.The presence and absence of any holes or protruding for Rainwater harvesting or for installation of elevators must be considered.The deflection of the flat slab according to its shear load must be analysed.Types of Flat Slab ConstructionThere are four main types of flat slabs depending upon the design:Simple flat slab – Flat slab without any kind of central supportsFlat slab with drop panels – Flat slab with drop panels to distribute the loadFlat slab with column heads – Flat slab with column heads to distribute the loadFlat slab with both drop panels and column heads1
CVEN90016 Design of Reinforced Concrete Flat Slabs_1
Uses of Column HeadsShear strength of the slab generally increases.Moment in the slab is reduces by reduction in the clear cover or effective span of the slab.Uses of Drop PanelsIn general, it increases the shear strength of the RC slabIt also increases the Negative moment of the RC slab. The deflection is generally reduced due to the stiffness in the slab. Advantages of Flat SlabsFlat slabs have very little framework and can be built in a very short span. The flat slabcan reduce the floor height and can be found very useful in the absence of false ceiling. Thisimproves the concept of Lower building heights and increased usage. Thickness of flat slabThe thickness provided for the flat slab is very important, as it is directly proportional tothe increase in floor height and inversely proportional to the cladding cost. By providingadditional reinforcements the thickness of slab can be reduced, and design issues can beresolved. DESIGN:DATA GIVENConsidering design conditions and effective values for calculation from AS3600-2009Fc= 40MPaFsy=500MPaMin clear cover = 25mm2
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Live load = 4KPaDead load = 1KPaWidth of Panel = 7.5m (a)Length of Panel = 6.5m (b)Length to Depth ratioLn/Ds 65 ln/ln'wK,Where Ln= Length of longer spanLn=Length of shorter spanW=Service loadK1=1.6 for exterior panels and 1.0 for Interior panels7.5/Ds657.5/6.561.0Ds = 250mmCALCULATION OF SERVICE LOADSelf-Weight 8.125KPaDead Load 1KPaLive Load 4KPa3
CVEN90016 Design of Reinforced Concrete Flat Slabs_3

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