The nonlinear stiffness matrix method was incorporated to investigate the structural performance of steel portal frames with semirigid\nconnections. A portal frame with unstiffened extended end-plate connection was designed to demonstrate the adequacy of\nthe proposed method. Besides, the seismic performance of steel portal frames with semirigid connections was investigated through\ntime history analysis where kinematic hysteresis model was assigned to semirigid connections to account for energy dissipation\nand unloading stiffness. Based on the results of the study, it was found that generally semirigid connections influenced the force\ndistribution which resulted in the decrease in base shear and lighter frame compared to the rigid one. The results also indicated\nthat there was no direct relationship between maximum displacement at the top and connection stiffness in high-rise frames.
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