EFFECT OF EARTHQUAKE INCIDENCE ANGLE ON SEISMIC PERFORMANCE OF RC BUILDINGS

M. Sri Kanya, B D V Chandra Mohan Rao

Abstract: Structural engineers greatest challenge in today’s scenario is constructing seismic resistant structures. In this paper, the influence of the earthquake direction on the seismic response of RC buildings is examined. In this study, three RC buildings, One regular and Two plan irregular buildings (Plus-shape, H-shape) are investigated for critical seismic incidence angle. All the buildings having the same floor plan area are modelled to have a better comparative study. In this paper, all the buildings are subjected to ground accelerations (Northridge earthquake record) in twelve directions whose values ranges between 0 to 180 degrees, with an increment of 15 degrees. The Linear Time History Analysis (LTHA) has been carried out for the above said buildings using ETABS v 15 Software. It is observed from the study that, the structural demand produced varies as the function of incidence angle of the seismic input. The various response parameters studied are axial forces in the columns, maximum storey displacement and storey shear. The results show that angle of seismic input motion considerably influences the response of RC structures.

Keywords: Incidence angle, Plan irregular buildings, Linear Time History Analysis, Column axial forces, Storey displacement, Storey shear

DOI: https://doi.org/10.15623/ijret.2015.0425062