Determination of risk-targeted ground motions based on different target fragility and seismic hazard functions

被引：0
作者：
Wang C. [1 ,2 ,3 ]
Lü D. [1 ,2 ,3 ]
机构：
[1] Key Lab of Structure Dynamic Behavior and Control of China Ministry of Education, Harbin Institute of Technology, Harbin
[2] Key Lab of Smart Prevention and Mitigation of Civil Engineering Disaster of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin
[3] Key Lab of Earthquake Disaster Mitigation of Ministry of Emergency Management, Harbin Institute of Technology, Harbin
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2023年 / 44卷
关键词：
conditional collapse probability; logarithmic standard deviation; peak ground acceleration; risk-targeted; seismic hazard; target fragility;
D O I：
10.14006/j.jzjgxb.2023.S2.0010
中图分类号：
学科分类号：
摘要：
The determination of risk-targeted ground motion involves a comprehensive consideration of both the seismic hazard of the site and the seismic fragility of the structure, thereby achieving uniform collapse risk. In this regard, fragility function and seismic hazard function have an important influence on the determination of risk-targeted ground motions. Therefore, the determination of risk-targeted ground motions based on different target fragility functions and seismic hazard functions was investigated. Three methods were used to determine the fragility curves, including the fixed values of logarithmic standard deviation and conditional collapse probability, the two parameters related to the design ground motions, and the two parameters obeyed the bivariate normal distribution. Moreover, the linear first-order approximation and the curvature-considered second-order approximation were used to determine the seismic hazard curves of the site of Class Ⅱ in the ground motion zonation map. Based on the aforementioned fragility curves and seismic hazard curves, the risk-targeted ground motions were determined. Subsequently, the risk-targeted ground motions determined based on the three fragility curves were compared, and the risk-targeted ground motions determined based on the first- and second-order approximated seismic hazard curves were also evaluated. The results indicate that the risk-targeted ground motion obtained from the fragility curve, which considers the values of logarithmic standard deviation and conditional collapse probability as fixed or assumes the two parameters obey the bivariate normal distribution, shows a very small difference (maximum difference of 0. 05%) compared to the results in the zonation map. This result is significantly higher than the results obtained from the fragility curve that assumes the two parameters are related to the design ground motions. Furthermore, the risk-targeted ground motion determined based on the first-order approximation of seismic hazard curve is about 3% higher than that based on the second-order approximation. © 2023 Science Press. All rights reserved.
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页码：96 / 106
页数：10
相关论文
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