Study on Non Linear Behavior of R.C Framed Structure with and without Considering Stiffness of Slab

Skeleton framing system composed of only reinforced concrete columns and beams have been adopted in analysis for many framed buildings. Generally, flexural stiffness of slabs is ignored and the floor load is transferred as uniformly distributed load on to the supporting beams in the conventional analysis of bare frame structures. However, in reality, the floor slabs may have some influence on the lateral response of the structures. Consequently, if the flexural stiffness of slabs in a frame system structure is totally ignored, the lateral stiffness of the framing may be underestimated. So, to study on the behavior of R.C structure with considering stiffness of slab is very essential. The research was already done on linear analysis of R.C structure with considering stiffness of slab. To predict the exact capacity of the R.C structure with considering stiffness of slab, need to depend on non-linear static analysis .To Model the Complex behavior of reinforced concrete analytically in its non-linear zone is difficult. This has led Engineers in the past to rely heavily on empirical formulas which were derived from numerous experiments for the design of reinforced concrete structures for structural design and assessment of reinforced concrete structures including force redistribution This analysis of the nonlinear response of R.C Structures to be carried out in routine fashion, it helps in the investigation behavior and the cracks pattern. Therefore the objective of the present investigation is to study the nonlinear behavior of the R.C structure with considering the effect of increased stiffness due to slab elements in R.C space frames, subjected to seismic loading, on the parameter like displacement etc. By comparing the two models of frame such has Skeleton framed structure (SFS), Skeleton framed Structure with considering stiffness of slab (SFWS), the effect of increased stiffness on the above parameters studied and also the increased capacity of framed system studied. This study is carried out on five storied R.C framed structure with two types of framing system (i.e with and without considering stiffness of slab). Performed nonlinear static analysis by using ETABS software. Frames are modelled with floor area of 225m2 (15m x15m) with three equal bays along X&Y direction. This prototype model is calibrated for R.C space framed buildings for four seismic zones of India. The framing systems compared based on the capacity curves obtained from the pushover analysis.