| 引用本文: | 何政,刘耀龙.考虑NGA地震动衰减关系的主余震概率损伤分析[J].哈尔滨工业大学学报,2014,46(6):86.DOI:10.11918/j.issn.0367-6234.2014.06.016 |
| HE Zheng,LIU Yaolong.Probabilistic damage analysis of mainshock-aftershock with the consideration of next generation attenuation relationship[J].Journal of Harbin Institute of Technology,2014,46(6):86.DOI:10.11918/j.issn.0367-6234.2014.06.016 |
|
| 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． |
| 关键词: 主余震 附加损伤 截面损伤率 超越概率 失效模式 NGA衰减关系 |
| DOI：10.11918/j.issn.0367-6234.2014.06.016 |
| 分类号:TU352; TU355 |
| 基金项目:国家自然科学基金资助项目 (1,9);教育部新世纪优秀人才资助项目(NCET-08-0096)． |
|
| Probabilistic damage analysis of mainshock-aftershock with the consideration of next generation attenuation relationship |
|
HE Zheng, LIU Yaolong
|
|
(Dept. of Civil Engineering, Dalian University of Technology, 116024 Dalian, Liaoning,China)
|
| Abstract: |
| To investigate the influence of mainshock-aftershock sequences on displacement responses, failure mode, global damage evolution, etc of structures, the sequences are generated by combining the next generation attenuation (NGA) relationship for earthquakes with the relationship between main shock and strong aftershock. The modified section damage ratio model is applied to analyze additional damage of an example structure under strong aftershocks, as well as probabilistic accumulative damage. The investigation indicates that additional damage incurred by strong aftershocks tends to increase as their probabilities of exceedance (POE) decrease. Approximate negative correlation could be observed between the damage ratios of main shocks and those added by strong aftershocks. When structures experience substantial damage under main shocks, probabilistic accumulative damage of structures would change significantly even coupled with damage induced by low-level aftershocks. Additional damage would be aggravated by so-called analogous resonance phenomenon when the predominant periods of the response spectra of these aftershocks are close to the vibration periods of damaged structures under main shocks. |
| Key words: main-aftershock additional damage section damage ratio probability of exceedance failure mode next generation attenuation relationship |
