Numerical study on the seismic performance of ‎realigned steel moment frames

Due to the increase in construction costs of new structures, it is expected that attempts to develop new techniques to accelerate the ‎return of earthquake-damaged structures to service. One of the methods that can be used is re-‎aligning the structure. In this research, ‎three models of steel moment frame structures with different numbers of stories, were analyzed by nonlinear ‎dynamic analyses with the help of Abaqus software. The studied models have ‎been subjected to several different records.‎ Each record is applied to each model under three separate ‎fashions. In the first case, only one earthquake record is applied to the model alone. In the second ‎case, IDA analysis is performed, and the structure is subjected to successive earthquakes from ‎low to high intensity. In the third case, the ‎analyzes are similar to the second case under seismic sequences, with the difference that after ‎applying each earthquake intensity and before applying the next intensity, the residual ‎displacements of each floor were made zero, which is an example of aligning the structure. ‎It was concluded that in most cases, the second series of ‎analyzes, have the ‎maximum drift and residual drift ratios.