Seismic evaluation of steel special momentresisting frames affected by pulse type ground motions

The main parameters of the dynamic behavior of steel Special Moment Resisting Frames (SMRF) which is used in steel structures as lateral load resistant system, under influencing pulse type ground motion have been evaluated in this research. The response parameters have been resulted by conducting a number of non-linear dynamic time history analyses. The structural models consist of 10, 20 and 30-story steel SMRF swhich have been designed according to the Iranian seismic code 2800 (3rd edition). The criterion for selecting the strong earthquake records has been the appearance of pulse type features in the velocity time histories concerning with high amplitude factors and long period do mains. The illustrated result sindicate that the structural response parameters are obviously affected by those group of earthquake records which contain pule type features and also the height of the analytical models. As a general conclusion, it is important to note that the lateral displacement and drift of all stories must be controlled during design process. The aforementioned subject can be considered in the design process of steel SMRFs in near zones of active faults.