Seismic Performance Evaluation Of Step-Back Rc Frame Building

Abstract

Nepal is situated in an area that experiences frequent earthquakes. Due to topographic limitations on intended construction, buildings in hilly places often adopt a step-back or a step-back & set-back arrangement as their structural shape. The adopted form inevitably results in an uneven structure as varied column heights generate twisting and higher shear during seismic ground motion. The aim of the thesis is to study the seismic performance of Setback RC building with and without the effect of Soil Structure Interaction using NBC and IS code. This is accomplished by performing the nonlinear static analysis. The building performance level is determined by intersection of demand and capacity curves and the hinge developed. Then, Fixed base of nonlinear analysis model is replaced with the springs. An overall seismic performance of building reveals that Capacity of model analyzed with NBC is higher than that of IS model and displacement and time period is higher in the case of SSI compared to fix base system. Stiffness of the model decreases after considering Soil Structure interaction (SSI). The result shows that after assigning spring, spring is responsible for governing the formation of hinges.