ANALYSIS OF SEISMIC SUSCEPTIBILITY OF AN IRREGULARLY PLANNED SETBACK STRUCTURE WITH A SOFT STOREY ON SLOPING TERRAIN AND PLAIN TERRAIN

Abstract

The construction of multi-story setback buildings with soft storey, or open ground floor, is in high demand and becoming more and more popular. This effort decreases the setback configuration's vertical stability and the lateral load resisting system's rigidity. When a building is supported on sloping land, there are several possibilities for short and long columns inside the same structure. During earthquake shaking, all columns and floor slabs at every level move horizontally by the same amount, which may result in structural damage. In this study, an attempt is made to examine the seismic performance of setback buildings standing on flat ground as well as on a slope, with soft storey layout. ETABS, a widely used software programme, was used to analyse simple 3-D frames of SETBACK structures. Using the study findings several graphs were drawn for like base shear, storey drift, storey stiffness, displacement, rotation about z axis are developed for both terrains i.e. plain and sloping. To create a technical expertise two identical structure were examined on both terrains. All the modelled structures with open ground storey have been analysed using two distinct methods: equivalent static force technique, response spectrum method. To counteract this soft storey impact and the severe reactions, mitigation approaches have been implemented, and the most effective of these mitigation techniques is provided.