Many studies on the strength reduction factor mainly focused on structures with the conventional hysteretic models. However, for the self-centering structure with the typical flag-shaped hysteretic behavior, the corresponding study is limited. The main purpose of this study is to investigate the strength reduction factor of the self-centering structure with flag-shaped hysteretic behavior subjected to near-fault pulse-like ground motions by the time history analysis. For this purpose, the smooth flag-shaped model based on Bouc-Wen model which can show flag-shaped hysteretic behavior is first described. The strength reduction factor spectra of the flag-shaped model are then calculated under 85 near-fault pulse-like ground motions. The influences of the ductility level, vibration period, site condition, hysteretic parameter, and hysteretic model are investigated statistically. For comparison, the strength reduction factors under ordinary ground motions are also analyzed. The results show that the strength reduction factor from near-fault pulse-like ground motions is smaller. Finally, a predictive model is proposed to estimate the strength reduction factor for the self-centering structure with the flag-shaped model under near-fault pulse-like ground motions.

中文翻译：

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近断层脉冲状地震动下自定心结构强度折减系数

许多关于强度折减系数的研究主要集中在具有传统滞后模型的结构上。然而，对于具有典型旗形迟滞行为的自定心结构，相应的研究是有限的。本研究的主要目的是通过时程分析研究近断层脉冲状地震动作用下具有旗形滞回特性的自定心结构的强度折减系数。为此，首先描述了基于 Bouc-Wen 模型的平滑旗形模型，该模型可以显示旗形滞后行为。然后在85次近断层脉冲状地震动下计算旗形模型的强度折减因子谱。延性水平、振动周期、现场条件、滞后参数的影响，和滞后模型进行统计研究。为了比较，还分析了普通地震动下的强度折减系数。结果表明，近断层脉冲状地面运动的强度折减系数较小。最后，提出了一种基于近断层脉冲状地震动的旗形模型估计自定心结构强度折减系数的预测模型。