考虑近断层方向性效应的速度脉冲放大作用预测模型

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Abstract Near-fault pulse-like ground motions cause severe damage in structures. Hence, for the probabilistic seismic hazard analysis and seismic design in the near-fault region, the pulse effects need to be taken into account. But, traditional ground-motion models may under-predict the velocity pulse-like strong ground motions in the near-fault region. Therefore, how to estimate the near-fault pulse-like strong ground motion is an active research topic in recent years. Here, based on the NGA-West2 database and the near-fault strong ground motions from the recent earthquakes, 316 pulse recordings are quantitatively identified by considering the uncertainty of pulse orientation and using the wavelet method. Then, based on the above data, quantitative empirical models of pulse amplification factor are proposed based on piecewise least-squares fitting of the results and compared with the previous pulse amplification model. Furthermore, the efficiency of the proposed model is tested. Compared with the previous pulse amplification model, the constant ordinate of plateau induced by pulse amplification of the proposed model is enhanced through considering the recent pulse ground motions. Finally, it is concluded that through multiplying the proposed model, the traditional ground-motion models can be corrected to reasonably approximate the pulse strong ground motions.

Key words： near-fault directivity pulse-like strong ground motions amplification factor;ground motion prediction equations

Received: 28 March 2022 Published: 28 April 2023

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	Articles by authors
	ZHAO Xiaofen1
	WEN Zengping1
	XIE Junju1
	XIE Quancai2
	XU Chao1
	WANG Yuanjie3

Cite this article:

ZHAO Xiaofen1,WEN Zengping1,XIE Junju1, et al. An empirical approach of accounting for the pulse amplification effects induced by near-fault directivity[J]. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(8): 305-318.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2023/V42/I8/305

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