INVESTIGATION OF THE CRITICAL DIRECTION OF SEISMIC FORCE FOR THE ANALYSIS OF R.C.C FRAMES

A simple method which can be applied in seismic cod es to determine the critical angle of seismic incidence is proposed in this paper. Two 4- story reinforced concrete buildings with moment resisting frames, one with square and the other wit h rectangular plan, have been analysed by Equivalent Static Method of analysis. A set of valu es from 0 to 90 degrees, with an increment of 10 degrees, have been used for angle of excitation. Buildings’ columns have been divided into three main categories, including corner, side, and intern al columns, and axial force and bending moment values in different columns, have been investigated in all cases