Study of Effect of Seismic Excitation Angle for the Analysis of Regular and Irregular RC Frame

Abstract

As the location of the epicentre is not known, it is necessary to determine the response of a structure for all possible orientations of the principal axes and design for the largest or critical response. In this paper, study has been made to examine the influence of the earthquake excitation angle on different types of building. Regular and irregular shape of building with G+9 stories are considered.A set of values from 0 to 90 degrees, with an increment of 10 degrees, have been used for angle of excitation. Building columns have been divided into three categories, including corner, side, and middle. The output response parameter studied is axial forces in the column. The angle at which maximum axial force in column occurs, that angle is considered as critical angle. Theresults show that angle of seismic excitation considerably influences the response of structure.