Strength reduction factor of self-centering structures under near-fault pulse-like ground motions
Strength reduction factor of self-centering structures under near-fault pulse-like ground motions
复制标题
近断层脉冲地震动作用下自复位结构的强度折减系数
DOI：
10.1177/1369433220945055
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发表时间：
2020-07
影响因子：
2.6
通讯作者：
Canxing Qiu
中科院分区：
文献类型：
--
作者：
Huihui Dong;Qiang Han;Xiuli Du;Canxing Qiu
目前对强度折减系数的研究主要集中在常规滞回模型下的结构。然而，对于具有典型旗形滞回特性的自定心结构，相应的研究还很有限。本文主要目的是通过时程分析研究具有旗形滞回特性的自定心结构在近断层脉冲型地震动作用下的强度折减系数。为此，首先描述了基于Bouc-Wen模型的光滑旗形模型，该模型能够反映旗形滞回特性。然后计算了旗形模型在85个近断层脉冲型地震动作用下的强度折减因子谱。统计分析了延性水平、自振周期、场地条件、滞回参数、滞回模型等因素对结构抗震性能的影响。为便于比较，还分析了普通地震动作用下的强度折减系数。结果表明，近断层脉冲型地震动强度折减系数较小。最后，提出了一个预测模型来估计近断层脉冲型地震动作用下旗形模型自定心结构的强度折减系数。
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.
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