摘要
地震的区域构造背景和传播路径有较大差异特征,因而实际观测的地震动具有显著的区域性差异。在结构动力时程分析时,虽然人工合成方法能够提供匹配设计谱的输入地震动,但是其并不能体现出地震动的区域特征。为了模拟考虑目标区域特征且完美匹配目标谱的地震动,该文提出了一种基于智能算法的地震动合成新方法。该方法应用主成分分析算法获取目标区域地震动的区域特征,由最大方差理论提取目标区域的种子地震动,再用基于粒子群算法优化的时域反应谱匹配方法调整种子地震动的反应谱,最终构造出包含区域特征和谱匹配的地震动时程。以四川地区为例验证了该方法的合理性和有效性,合成的地震动在时域和频域上均与该区域实际地震动特征一致。该文提出的方法的优点在于合成的地震动具有显著的区域特征,且与目标谱有更好的匹配效果和更高的匹配效率,可为结构动力反应分析提供考虑区域性差异、具有低不确定性的地震动输入。
Due to the influence of regional seismic source structures,the actual observed ground motion has significant regional differences.In the current structural dynamic time-history analysis,although the synthetic method can provide the spectra-compatible ground motion input,it cannot reflect the actual ground motion characteristics in the target area.In order to synthesize the ground motion,which contains the characteristics of the target region and is perfectly compatible with the target spectrum,a new method for ground motion synthesis based on intelligent algorithm is proposed.In this method,the principal component analysis algorithm was used to obtain the actual regional ground motion characteristics,the maximum variance theory was used to extract the seeds ground motion in the target area,the response spectrum of seed ground motion was adjusted by time domain response spectrum matching method optimized by particle swarm optimization algorithm,and the spectracompatible ground motion time history containing regional characteristics was finally constructed.The rationality and effectiveness of this method are verified by taking Sichuan area as an example,and the characteristics of the synthesized ground motion in time domain and frequency domain are consistent with the actual ground motion in this area.The advantage of the proposed method is that the synthesized ground motion has significant regional characteristics,and has better matching effect and higher matching efficiency with the target spectrum,which can provide low uncertainty ground motion input considering regional differences for structural dynamic response analyses.
作者
胡进军
王中伟
张辉
靳超越
胡磊
HU Jin-jun;WANG Zhong-wei;ZHANG Hui;JIN Chao-yue;HU Lei(Key Laboratory of Earthquake Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin,Heilongjiang 150080,China)
出处
《工程力学》
EI
CSCD
北大核心
2022年第12期202-211,共10页
Engineering Mechanics
基金
国家自然科学基金项目(U1939210,52078470)
国家重点研发计划项目(2018YFC1504401)。
关键词
强震动记录
设计地震动时程
特征提取
谱匹配优化
高效匹配
strong ground motions
design ground motion
feature extraction
spectral matching optimization
efficient matching
