场地条件校正的地震动快速评估方法研究

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Abstract Peak ground acceleration (PGA) is an important index for earthquake early warning, intensity quick report and structural aseismic design.Here, earthquake records of KiK-net in Japan were collected and arranged.The site cover thickness D and equivalent shear wave velocity Vse adopted in our country’s aseismic code were taken as site characteristic parameters, and peak bedrock acceleration (PBA) was taken as input earthquake dynamic strength index, based on the classification and regression tree (CART) method, a ground motion early warning method considering site condition correction under PGA’s thresholds of 40 gal, 80 gal and 120 gal, respectively was proposed, and ranges of parameter indexes were given.Through check-back tests for the data collected from KiK-net in Japan, it was shown that the total earthquake early warning success rates are 84.7%, 90.1% and 93.6% corresponding to PGA values of 40 gal, 80 gal or 120 gal, respectively.The strong earthquake data collected in our country’s Sichuan and Yunnan areas were used to verify the reliability of the proposed method, the results showed that the total earthquake early warning success rates are 88.4%, 92.3% and 93.4%, respectively under 3 seismic intensities mentioned above.

Key words： earthquake early warning site characteristic parameters CART ground motion fast assessment

Received: 29 June 2018 Published: 28 January 2020

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	WU Xiaoyang
	CHEN Longwei
	YUAN Xiaoming

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WU Xiaoyang,CHEN Longwei,YUAN Xiaoming. Fast assessment method for ground motion considering site condition correction[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(3): 193-198.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I3/193

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