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首页> 外文期刊>Bulletin of earthquake engineering >The ductility-based strength reduction factor for the mainshock-aftershock sequence-type ground motions
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The ductility-based strength reduction factor for the mainshock-aftershock sequence-type ground motions

机译：主震-余震序列型地面运动基于延性的强度折减系数

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摘要

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.
机译：该手稿研究了承受主震-余震序列型地震动的具有恒定延性性能的单自由度系统的强度折减系数。使用记录的和人工序列类型的地面运动。余震地面运动按顺序缩放以具有不同的相对强度水平。四个滞后模型用于模拟不同类型的结构。统计研究周期，延性因子，现场条件，余震，滞回行为和阻尼的影响。结果表明，强烈的余震地震动对短时间段内强度折减系数的影响比对长时段内强度折减系数的影响更大。降解行为会以小于20％的幅度降低短时结构的强度降低因子，而以最大20％的水平降低中长期结构的强度降低因子。最后，提出了结合余震影响的预测模型，以确定抗震设计中的强度折减系数。

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