OPTIMUM LOCATION OF SHEAR WALLS IN HIGH RISE R.C.C BUILDINGS SUBJECTED TO STATIC AND DYNAMIC LOADING IN SEISMIC ZONES

Abstract

R.C.C structures are subjected to vertical loads such as self weight of structural members, self weight of brick work, live load on floors etc. and horizontal loads such as seismic and wind forces. Due to these lateral loads, lateral deflection and support reaction increases. The behaviour of RCC structures is different under horizontal and vertical loads. The RCC moment -resisting frame are observed to be vulnerable in seismic active areas or locations. India is divided into four seismic zones based on past earthquake history and are been published in IS 1893(PART-1)-2002 Code of practise for seismic design. In the present study, shear wall is provided for lateral strengthening of high rise structure and it is observed that the structures with provision of shear walls have increased stiffness in the directions parallel to the length of the shear walls. But the optimum location and position of shear walls is to be identified based on the lateral forces. In order to find the optimum location of the shear walls in the present study four structures of G+6 storeys with and without shear walls are considered in various seismic zones II, III, IV, V. Analysis is carried out using staad.pro(v8i ss5) software. Height, length and width of the structures are kept constant and seismic loads are calculated as per IS 1893(PART-1) 2002 and wind pressures across the height of the structure is calculated as per IS 875-1987 (PART III).