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Flat- slab building structures possesses major advantages over traditional slab- beam-column structures because of the free design of space, shorter construction time, architectural –functional and economical aspects. Advancements of computer packages have given many tools to the designer towards achieving the best and accuracy in their work. Hence an Engineer to be knowledgeable about the planning and designing of such Multi-storied Buildings. Adapting the construction of Multi-storied Building not only matches with demand but also decreases the price of the single house.
Especially in towns due to rapid industrialization, the demand is very high.
With the increase in population and development of civilization, the demand for HOUSING is increasing at a peak rate. In the present work dynamic analysis of 25 models of multi-storied RCC Flat slab structure is carried out by response spectrum analysis. Response Spectrum analysis is one of the important techniques for structural seismic analysis. This fact has resulted in to ensure safety against earthquake forces of tall structures hence, there is need to determine seismic responses of such building for designing earthquake resistant structures. The behavior of flat slab building during earthquake depends critically on ‘ Building Configuration’. The critical moment in design of these systems is the slab- column connection, i.e., the shear force in the slab at the connection, which should retain its bearing capacity even at maximal displacements. Because of the absence of deep beams and shear walls, flat- slab structural system is significantly more flexible for lateral loads then traditional RC frame system and that make the system more vulnerable under seismic events. ***- Abstract - Flat- slab building structures possesses major advantages over traditional slab-beam-column structures because of the free design of space, shorter construction time, architectural –functional and economical aspects. There are also some associated labour and time savings Thinner floors provide lower building weight, which creates a corresponding reduction in other structural elements.
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In addition, post-tensioned structures can be designed to have minimal deflection and cracking, even under full load. Post tensioning is the key to cost-effective multifamily construction. Consequently, the first priority in designing for economy is selecting the structural system that offers lowest overall cost while meeting load requirements. Likewise, the majority of a structure’s formwork cost is usually associated with the horizontal elements. All structural costs, floor framing is usually the largest component. Post-tensioning is preferred as it is in vogue, in construction of large span slabs. Intensity of assumed loading is kept sufficient enough, so that the factored bending moment will be comparable to that developing in cases of commercial buildings. For smaller spans, associated with normal building works, prestressed concrete construction becomes too cumbersome, irrespective of the economics involved. ABSTRACT: This work includes the design and estimate for flat slabs of various spans, ranging from 6.0 m to 12.0 m, by reinforced concrete cement and prestressed concrete techniques.