Damage spectra for the mainshock-aftershock sequence-type ground motions

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• 作者：Chang-Hai Zhai^a ; ^{TUzch-hit@hit.edu.cnUT} ; Wei-Ping Wen^a ; ZhiQiang Chen^b ; Shuang Li^a ; Li-Li Xie^a ; ^c
• 关键词：Damage spectra ; Mainshock&ndash ; aftershock sequence-type ground motions ; Seismic sequence ; Damage index
• 刊名：Soil Dynamics and Earthquake Engineering
• 出版年：2013
• 出版时间：February, 2013
• 年：2013
• 卷：45
• 期：Complete
• 页码：1-12
• 全文大小：1408 K

文摘

Strong aftershocks have the potential to increase the damage state of the structures due to the damage accumulation. This paper investigates the damage spectra for the mainshock-aftershock sequence-type ground motions with Park-Ang damage index. A method of simulating the mainshock-aftershock sequence-type ground motions is proposed based on the modified form of Bath's law and NGA ground motion prediction equation. The damage spectra are computed using the recorded and simulated sequence-type ground motions, and the effects of period of vibration, strength reduction factor, site condition, seismic sequence, damping ratio and post-yield stiffness on damage spectra are studied statistically. The results indicate that the effect of aftershock on structural damage is significant and recorded sequence-type ground motions may underestimate the damage of long-period structures due to the incompleteness of dataset. A simplified equation is proposed to facilitate the application of damage spectra in the seismic practice for mainshock-aftershock sequence-type ground motions.