Seismic Response of (G+10) R.C.C Building with Floating Column In Different Zones

Abstract

In the current situation, majority of the buildings are usually erected on the steep ground owing to the limitations of the terrain. The behaviour of building on sloping ground during earthquake is dependent on distribution of stiffness and mass in vertical and horizontal plane, which are different in the case of building resting in sloping ground. Short columns are very stiff, and thus they absorb a lot of structural energy. Some of the manuals and regulations like the Earthquake regulations to this phenomenon require an additional attention to be paid to it. The building that was considered in this study has a G + 10 storeys reinforced concrete (RC) building with variable ground slope as 0 0, 5, 10, 15 and 20 without shear walls and with shear walls regular on plan and at corner as well. The constructions are planned according to the IS 456:2000 and subjected to the earthquake loads. Liner Static and Linear Dynamic analysis (Response Spectrum and Linear Time History analysis) has been done using structure analysis tool SAP 2000, on the modelling and analysis of the building. The primary purpose is to determine the behaviour of the building on sloping ground due to different height of column used in bottom storey and different location of shear walls and to investigate the effectiveness of shear wall on the sloping ground. The building models have been found to check performance of the building by studying the dynamic properties such as maximum forces in columns, Base shear, Roof displacement, Bending Moments and Fundamental natural periods. It is noted that step back buildings with shear walls which are symmetrically arranged in plan are observed to be more appropriate as compared to step back buildings which have shear walls arranged in peripheral corners and buildings which do not have shear wall.