EFFECT OF INFILL WALL ON SEISMIC PERFORMANCE OF RC BUILDING WITH OPEN GROUND STOREY
Keywords:
Infill walled building, Soft-storey collapse, Base shear Multiplication factor, ETABS.Abstract
Earthquake is an unavoidable natural disaster which causes large damage to the property and the lives.
Most earthquake-related deaths are caused by the collapse of structures. Day by day demands of high rise structures
increases with the increase in population. However, to fulfill the need of parking spaces ground story of building is
utilized which makes building more vulnerable under lateral loads. Past earthquakes shows that the most of the damages
in open ground storey are occurred in the ground storey columns and is called ‘soft-storey collapses’, ‘storeymechanism’ or column mechanism’. These are due to the sudden lowering stiffness or strength in the open ground storey
as compare to other infill stories. To prevent the soft storey failure IS 1893:2002 recommends a multiplication factor of
2.5. But, the multiplication factor proposed by IS 1893:2002 and selected international codes are not consistent.
Therefore, it calls an assessment of multiplication factors by static nonlinear analysis considering infill stiffness and
strength. In present paper static nonlinear analysis of infilled walled building with open ground storey is discussed for
more realistic seismic analysis. For the study purpose G+5, G+7 and G+9 storey infilled wall buildings with different
infill percentage has been considered. The modeling and static nonlinear analysis of building is carried out using ETABS
software. The base shear multiplication factor obtained for various buildings are compared with the standard base shear
multiplication factor available in IS1893-2002.
