Evaluation of R.C.C Flat Slab and Conventional Slab Subjected to Seismic and Temperature Load

In today's construction the use of flat slab has become quite common. 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. Flat slab construction is a developing technology in India. The conventional slab has more stiffness and higher load carrying capacity. Due to urbanization and aesthetic reasons flat slab have become quite common. 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. The performance of flat slab system under temperature loading is also very poor. It is necessary to analyse seismic behavior of buildings for various heights to see what are the changes that are going to occur for the conventional RC frame building, flat slab building with and without drops. In this comparative study, the seismic behavior of R.C.C flat slab and conventional slab is evaluated by nonlinear time-history analyses with different temperature loading with the help of SAP 2000 v18 software. The main parameters evaluated in this study are lateral displacement, inter story drift, axial force, and bending moment. A total of 12 models with three different structural systems i.e., conventional slab system, flat slab system without drops and flat slab system with drops are considered. For each structural system 150mm and 200mm thickness of the slab is taken, so we have six basic models. For each basic model G+4, G+8 stories are considered. The performance of flat slab and conventional slab has to be studied when subjected to Seismic loading due to occurrence of varying magnitudes of earthquakes having different frequencies. The temperature loading is being considered due to frequent occurrences of fire accidents and also due to the need for knowledge in people about fire hazards. Fire will not only cause casualties but also effect the structure predominantly leading to its destruction. From results it can be concluded that conventional slab of 150 mm thickness is more effective for G+4 & G+8. For normal and high temperature 150mm thickness is good for G+4, G+8.