Assessing the Impact of Soil-Structure Interaction on Seismic Performance of Step Back and Set Back Buildings on Sloping Ground

Abstract

When constructing framed structures on sloping ground, either step back or step back and set back configurations are typically adopted. Due to the varying heights of columns towards the slope and the unsymmetrical nature of these buildings, they are subject to large forces such as shear forces, bending moments, torsional moments, and unequal distribution. In the past, it was common practice to assume that structures were fixed at the base, which can lead to errors in evaluation during dynamic loading, particularly depending on the type of soil at the base. To more accurately capture the real behavior of reinforced concrete (R.C.C.) framed buildings resting on a slope, this study uses response spectrum analysis to examine the effect of soil-structure interaction (SSI) on the seismic performance of R.C.C. framed buildings with varying underlying soil types (hard, medium, and soft soil) and angles of slope from 10 to 40 degrees using ETABS software. The buildings will also be analyzed with respect to various slopes of ground and soil types, incorporating shear walls. Results will be analyzed in the form of base shear, bending moment, torsional moment, time period, storey displacement, and storey drift.