Nonlinear Seismic Performance of RC Structures with Different Floor by Capacity Spectrum Method

Civil engineering structures as well as office or apartment building are affected by earthquakes. In some buildings, few or no walls are provided at the first story (pilot). In the structures with difference in story level, major problems is due to discontinuity of floor diaphragm that causes significant changes in period, stiffness and distribution of earthquake force. In this paper, using linear and nonlinear static analysis, time history and location of plastic hinge in short columns and beams, period, displacement, shear force, performance point and capacity spectrum and…, in 2, 4, 6, 8, and 10 story structures with story level difference are studied. The results show that the effect of level difference in short structures is obvious and by increasing the height difference, the effect of short column phenomenon is decreased and the performance point is increased.