Performance Evaluation of Different Types of Steel Moment Resisting Frames Subjected to Strong Ground Motion through Incremental Dynamic Analysis

摘要

Comparative studies on seismic performance for various types of steel moment resisting frames subjected to near field and far field earthquakes are performed through Incremental dynamic analysis (IDA) method in this study. Near field earthquake has a pulse like effects on the structures. It imports immediate force in very short duration to buildings. Therefore, destructive effects of surge energy are not negligible. Four intensity indices are used, namely, peak acceleration (PGA), spectral acceleration at the structure's first-mode period (S_a(T_b 5%)), spectral acceleration at the structure's nth effective-mode period (S_a(T_n, 5%)) and the Spectral velocity at the structure's first-mode period (S_A(T_1, 5%)). Numerical results illustrate that the intensity measure parameters related to ground velocity and the higher mode-related parameters present better correlation with the seismic responses of near source ground motion for given systems. The higher mode-related parameters are more suitable for tall systems subjected to near field earthquakes. Moreover, the chosen parameters S_a(T_n, 5%) and S_v(T_1, 5%) of near-fault impulsive ground motions enhance the performance of intensity measure of corresponding conventional parameters, i.e. S_a(T_1 5%). A comparison for the special and intermediate steel moment resisting frames is made as regard to performance using IDA method. A more efficient performance is observed for the special moment resisting frames compare to intermediate ones.