摘要
目前性态地震工程以控制地震风险为最终目标,而承灾体的地震风险在很大程度上取决于所在场址的概率地震危险水平。为了尽可能降低地震动输入中认知不确定性造成的结构响应差异,地震动输入需要能反映出场址可能遭受的地震危险性水平。因此,对风险导向地震工程中危险一致地震动输入研究进行梳理,首先介绍其基本概念,分析基于地震强度指标幅值与基于风险的两种概率地震需求分析思路的差异,指出工程地震动输入面临的核心矛盾是如何在体现场址危险性水平与完备刻画真实地震动记录特征之间实现平衡;进而梳理了场址危险一致强震记录选取的标志性成果,及危险一致记录选取目标谱的国内外标志性成果与最新进展,包括狭义条件谱、广义条件谱、构造式条件谱以及多变量重现期目标谱等,分析了不同目标谱选取方法的优劣与发展路径;考虑到地震动模拟技术的迅速发展,讨论了场址危险一致地震动模拟的实现路径与可能的局限性,分析了分别基于目标谱、物理机制和地震参数拟合的3种不同模拟地震动途径的前景与存在的问题。通过总结风险导向性态地震工程中危险一致地震动输入的研究进展,探讨了在概率地震需求分析中合理选用符合场址危险水平的地震动输入的有效方法及其理论依据,以实现提升结构抗震可靠性的目标。
Seismic risk control is the ultimate goal for performance-based earthquake engineering.Site specific seismic hazard level is a critical factor influencing the final risk level of the exposed structure.To reduce structural response variability from cognitive ground motion uncertainty,selected motions must reflect the seismic hazard for the engineering site.This paper introduced the concept of hazard-consistent ground motion input in risk-oriented performance-based earthquake engineering and explored the differences between intensity-based and risk-based probabilistic seismic demand analysis approaches.The core challenge faced by engineering ground motion input is how to achieve a balance between reflecting the site-specific hazard level and adequately characterizing the features of actual ground motion records.The paper then reviewed the milestone studies on the selection of hazard-consistent strong ground motion records and discussed the latest advancements in hazard consistent target spectrum,including the conditional spectrum,generalized conditional spectrum,conditional spectrum based on constructed IMs,and multi-return-period based spectrum.Advantages and development paths of various selection methods were analyzed.Considering the rapid advancements of ground motion simulation technology,potential methods and limitations for achieving hazard-consistent ground motion simulation at a site were discussed,including target spectrum-based simulations(artificial groundmotions),physics-based ground motion simulations,and stochastic empirical simulations fitted to seismic parameters of real recordings.This paper systematically reviewed advancements in hazard-consistent ground motion input in risk-oriented performance-based earthquake engineering,elucidating methods for effectively selecting and utilizing ground motions aligned with site-specific hazard levels in probabilistic seismic demand analysis.This approach enhances the reliability of seismic design,providing theoretical support and methodological guidance for hazard-consistent ground motion utilization tailored to site-specific hazard level.
作者
冀昆
于晓辉
曹徐阳
宁超列
温瑞智
沈德建
JI Kun;YU Xiaohui;CAO Xuyang;NING Chaolie;WEN Ruizhi;SHEN Dejian(State Key Laboratory of Precision Blasting,Hohai University,Nanjing 210024,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210024,China;Nanjing Engineering Research Center for Prefabricated Construction,Nanjing 210024,China;College of Civil Engineering,Guilin University of Technology,Guilin 541006,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China)
出处
《建筑结构学报》
北大核心
2025年第11期207-222,共16页
Journal of Building Structures
基金
中央高校基本科研业务费专项(B240201087)
国家自然科学基金面上项目(52378506,52478165)。
关键词
性态地震工程
地震动记录选取
危险一致目标谱
条件目标谱
概率地震危险性分析
performance-based earthquake engineering
ground motion record selection
hazard-consistent target spectrum
conditional target spectrum
probabilistic seismic hazard analysis
