عنوان مقاله [English]
In the past decades, the use of steel plate shear wall systems is on the rise in new and existing buildings to resist against lateral forces. Dual steel shear wall system, has many advantages in comparison with the conventional lateral load systems. A four story frame is selected in 4-storey building with a height of 3.5 meters per floor. This building loading is according to 2800 standard and seismic design by AISC360-10 cod and AISC Design Guide 20. To achieve the full range of structural response under earthquake in incremental dynamic analysis, Record intensity is applied to the structure to increase step by step. For this purpose, it is necessary to select the parameters as seismic intensity measure (IM) that can be linked by a scaling factor to the original records. Three four story frame models with different dynamic characteristics are subjected to an ensemble of 20 far-field earthquake ground motion records with a magnitude of 6 to 5.7 on the soil type II. This article is studied based on 25 candidate intensity measures for models in different dynamic characteristics. Accordingly two characteristics of efficiency and sufficiency were determined using regression analysis. Engineering demand parameters, which appropriately characterize the seismic response of the dual steel shear wall system and its related damage, are selected. Different proposed IMs are investigated and classified based on their efficiency and sufficiency in predicting engineering demand parameters. The optimal IMs for estimating dual steel shear wall system response due to seismic excitation are identified based on both efficiency and sufficiency. The results show that the appropriate intensity measure is dependent on the dynamic characteristics of structures. For selecting the models with short period, peak ground velocity is the optimal IMs based on both efficiency and sufficiency; for models with average and big period, the optimal IM is PGV/PGA.