Gholam Hossein Hosseini - Department of Civil Engineering, Faculty of Engineering, University of Jaberebnehayyan, Rasht, Iran
Vahid Najafi Moghaddam Gilani - Department of Civil Engineering, Faculty of Engineering, University of Jaberebnehayyan, Rasht, Iran
Mozaffar Abdollahi Gazafroudi - Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran
Reza Kamali - Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran
Yaser Sotoudeh - Department of Civil Engineering, Faculty of Engineering, University of Jaberebnehayyan, Rasht, Iran

Today, using non-linear static analysis of the seismic vulnerability of structures and improvements is quite common. Guidelines for the seismic rehabilitation of structures ranging from (FEMA273) in increasingly non-linear static analysis, different lateral load patterns suggest the use of any of the conditions and requirements that choice leads to a different results in this pattern to structures, Both lateral shift and the shift is relative. The aim of this study is to investigate the effect of selecting the patterns of lateral loading on the structural response analysis method (MPA) and compare them with analytical method (NLTH). In order to achieve the overall results and the effect of parameters on the seismic vulnerability of reinforced concrete buildings in the study, several structures based on nonlinear dynamical behavior have been used. To prevent the spread of the results, but different in the number of layers (floors) (8, 12 and 15 floors) with different mass irregularities in elevation, in concrete moment resisting frames were designed to handle. Because of the nonlinear behavior of buildings during an earthquake, IDARC Analysis computer program that can model the nonlinear behavior of reinforced concrete members is used. Lateral load patterns used are: (A: Reverse Triangular, (b) uniform c: Moody SRSS). For nonlinear analyses of 10 acceleration, as the history of 10 strong ground motion is used as theoretical.

Load distribution, Modal Push-Over, Number of storeys, Mass irregularity