序列地震动作用下复杂高层结构的反应特征分析

Response Characteristics Analysis of Complex High-Rise Buildings under Seismic Sequence

现有的结构地震反应分析通常只考虑主震作用,而在历次震害中余震导致建筑物破坏加剧甚至倒塌的事例时有发生.将实测主震加速度时程和余震加速度时程,采取首尾相连、中间间隔零幅值时程的方式模拟主、余震序列地震动,以某98m高的复杂高层结构为背景,分析了主、余震序列地震动作用下复杂高层结构的反应特征,对比了主震作用、余震作用、以及主余震序列地震动作用下结构反应的差异.结果表明:余震对结构损伤加重的影响在各楼层间分布不均匀,主震作用下损伤严重的楼层,在余震作用时的损伤加重程度更大;余震作用使结构的残余位移发生了变化,结构的损伤加重;序列地震动作用下结构的塑性损耗指标较对应主震单独作用时有较明显增大.

The most current analysis of structural seismic response is only taking the main-earthquake into account. However, historical earthquake damage had showed that the afiershocks sometimes aggravated the structural damage or even caused the collapse of buildings. In this paper, the seismic sequence was simulated by link the recorded main-earthquake acceleration time history and post-earthquakes＇ end to end; a 98m complex high-rise building was taken as the subject. The response characteristics of complex high-rise building under the seismic sequence were studied; compared the difference of structural response characteristic under mainshock, aRershock and the seismic sequence. The analysis revealed that the aggravation of structural damage under aRershock was unevenly distributed among floors; the more serious damaged floors under the mainshock would suffer the more serious aggravation under aftershock. The structural residual displacement changed under aftershock. The structural plastic damage index under the seismic sequence was apparently bigger than that under mainshock.