The ductility-based strength reduction factor for the mainshock–aftershock sequence-type ground motions
The ductility-based strength reduction factor for the mainshock–aftershock sequence-type ground motions
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DOI：
10.1007/s10518-015-9744-z
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发表时间：
2015-03
影响因子：
4.6
通讯作者：
C. Zhai;W. Wen;Shuang Li;Lili Xie
中科院分区：
文献类型：
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作者：
C. Zhai;W. Wen;Shuang Li;Lili Xie
本文研究了具有常延性性能的单自由度体系在主震-余震序列型地震动作用下的强度折减系数。记录和人工序列型地面运动。将序列中的余震地震动标度为具有不同的相对强度水平。四个滞回模型被用来模拟不同类型的结构。统计分析了周期、延性系数、场地条件、余震、滞回性能和阻尼等因素对结构抗震性能的影响。结果表明，强余震地震动对短周期区强度折减系数的影响比长周期区明显。劣化行为使短周期结构的强度折减系数减小，减小幅度小于20%，而使中长周期结构的强度折减系数增大，增大幅度最大可达20%。最后，提出了一个预测模型，将余震的影响，以确定强度折减系数的抗震设计。
This manuscript investigates the strength reduction factor of single degree of freedom system with constant ductility performance subjected to the mainshock–aftershock sequence-type ground motions. The recorded and artificial sequence-type ground motions are used. The aftershock ground motions in sequence are scaled to have different relative intensity levels. Four hysteretic models are used to simulate the different type of structures. The effects of period, ductility factor, site condition, aftershock, hysteretic behavior and damping are studied statistically. The results indicate that the strong aftershock ground motion has more obvious influences on strength reduction factors in short period region than on those in long period region. The degrading behavior would decrease the strength reduction factor of structure with short period at a magnitude of <20 %, while it would increase that of structure with medium-long period at a maximum level of 20 %. Finally, a predictive model, incorporating the effect of aftershock, is proposed to determine the strength reduction factor in the seismic design.