1.信阳师范大学建筑与土木工程学院,河南 信阳 464000
2.武汉工程大学土木工程与建筑学院,湖北 武汉430074
3.大连理工大学海岸和近海工程国家重点实验室,辽宁 大连 116024
阮鑫鑫(1994—),男,讲师,博士。主要从事工程结构抗震研究。E-mail: ruanxinxin1994@163.com
姜云木(1997—),男,博士研究生。主要从事工程结构抗灾可靠性研究。E-mail: jiangyunmu@163.com
收稿:2022-11-02,
修回:2023-01-16,
纸质出版:2024-04-25
移动端阅览
阮鑫鑫,范颖霏,刘章军等.给定地震场景下的随机地震动降维模拟[J].防灾减灾工程学报,2024,44(02):353-361.
RUAN Xinxin,FAN Yingfei,LIU Zhangjun,et al.Dimension‑reduction Simulation of Stochastic Ground Motion under Predefined Earthquake Scenarios[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(02):353-361.
阮鑫鑫,范颖霏,刘章军等.给定地震场景下的随机地震动降维模拟[J].防灾减灾工程学报,2024,44(02):353-361. DOI: 10.13409/j.cnki.jdpme.20221102005.
RUAN Xinxin,FAN Yingfei,LIU Zhangjun,et al.Dimension‑reduction Simulation of Stochastic Ground Motion under Predefined Earthquake Scenarios[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(02):353-361. DOI: 10.13409/j.cnki.jdpme.20221102005.
建立了一种可根据地震场景预测和模拟随机地震动加速度过程的降维模型。首先,挑选了1 766条实测强震记录,根据断层类型和场地类别进行了分组,并识别了各组地震动的演变功率谱参数;然后,基于地震场景参数和演变功率谱参数,训练了两者的高斯过程回归模型(GPRM),并采用K‑fold交叉验证法,验证GPRM预测的有效性和精确性;最后,基于非平稳随机过程的谱表示法,通过引入随机函数的降维思想,实现了在给定地震场景下的随机地震动降维模拟。数值算例表明,预测的样本在频谱、峰值、强震持时等方面均与实测记录保持一致,体现了本文方法良好的工程适用性。这为地震动目标地区提供较为合理的人工地震动数据以及工程结构的随机地震反应分析与可靠性评价奠定了基础。
Based on the earthquake scenarios
a dimension-reduction model capable of predicting and simulating the stochastic ground motion acceleration process was developed. Firstly
1766 strong motion records were selected and grouped according to fault types and site classification. Parameters of evolutionary power spectrum (EPS) for each group were identified. Secondly
based on the parameters for earthquake scenarios and the EPS
a Gaussian process regression model (GPRM) was trained. Meanwhile
the K-fold cross-validation method was adopted to verify its prediction effectiveness and accuracy. Finally
using the spectral representation method of non-stationary random processes and incorporating the concept of dimension reduction for random functions
the dimension reduction simulation of stochastic ground motion was achieved under predefined earthquake scenarios. Numerical examples showed that the predicted samples were consistent with the measured records in terms of frequency spectrum
peak values
and duration of strong motion
which verified the suitability of the proposed methodology in engineering applications. The research provides reasonable artificial ground motion data for target areas
and lays a foundation for random seismic response analysis and reliability evaluations of engineering structures.
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