考虑NGA地震动衰减关系的主余震概率损伤分析

发布时间：2018-05-01 04:43

本文选题：主余震 + 附加损伤　；参考：《哈尔滨工业大学学报》2014年06期

【摘要】：为研究主余震序列作用下结构的位移响应、失效模式以及整体损伤演化等方面的影响规律,结合主震与强余震统计关系和NGA地震动衰减关系构造了主余震地震动序列,采用改进的截面损伤率计算方法分析了算例结构在强余震引起的附加损伤率,并从概率角度刻画了强余震造成的概率累积损伤.研究表明:强余震引起结构的附加损伤随着其超越概率的减小而呈现增加的趋势;结构的主震损伤率与余震附加损伤率呈现近似负相关关系;当结构遭受主震后的损伤率较大时,即便较小的余震造成的损伤也会导致结构概率累积损伤发生较大的变化;如果余震的卓越周期与主震下受损结构的自振周期相近时,存在类共振现象,可加重结构的附加损伤.
[Abstract]:In order to study the influence law of displacement response, failure mode and global damage evolution of the structure under the action of main aftershock sequence, combined with the statistical relation between main shock and strong aftershock and the attenuation relation of NGA ground motion, the main aftershock ground motion sequence is constructed. An improved section damage rate calculation method is used to analyze the additional damage rate caused by strong aftershocks and the probabilistic cumulative damage caused by strong aftershocks is described from the point of view of probability. The results show that the additional damage of the structure caused by strong aftershocks increases with the decrease of its transcendence probability, and the damage rate of the main shock and the additional damage rate of the aftershock show an approximate negative correlation. When the damage rate of the structure subjected to the main shock is large, even the damage caused by the smaller aftershock will lead to a great change in the probability cumulative damage of the structure, if the excellent period of the aftershock is close to the natural vibration period of the damaged structure under the main shock, The existence of resonance like phenomenon can aggravate the additional damage of the structure.
【作者单位】：大连理工大学土木工程学院;
【基金】：国家自然科学基金资助项目(91315301,51161120359) 教育部新世纪优秀人才资助项目(NCET-08-0096)
【分类号】：TU352.11

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