震级、震中距和场地类别对加速度谱与伪加速度谱关系的影响  

Effects of magnitude,epicentral distance and site class on the relationship between spectral and pseudospectral acceleration

作　　者：杭保健 张海仲 赵衍刚 HANG Baojian;ZHANG Haizhong;ZHAO Yangang(Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China;Department of Architecture,Kanagawa University,Yokohama,221-8686,Japan)

机构地区：[1]北京工业大学城市建设学部,北京100124 [2]神奈川大学工学部建筑学科,日本横滨221-8686

出　　处：《地震工程与工程振动》2022年第4期219-228,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51738001)。

摘　　要：加速度反应谱(Sa)和伪加速度反应谱(PSa)在结构抗震设计中均起着至关重要的作用,然而目前大多数抗震规范都只规定了其中一种反应谱。明确两者的关系有助于从规定谱得到所需的另一种谱。现有关于Sa与PSa关系的研究大多只局限于分析结构阻尼比和周期的影响,最近研究表明,震级、震中距和场地类别对两者的关系也有影响。文中首先通过对大量地震动记录(16660条地震加速度时程)的统计分析,系统地探讨了震级、震中距和场地类别对Sa与PSa关系的影响。结果表明:(1)震级对Sa与PSa关系的影响非常显著,Sa与PSa的差异随着震级的增大而缩小;(2)场地类别的影响弱于震级且与震级大小有关,不同震级条件下场地类别对Sa与PSa关系的影响规律不统一;(3)震中距的作用很小,可以忽略其对Sa与PSa关系的影响。最后基于这些结论,通过非线性回归分析,建立了考虑震级和场地类别的Sa与PSa的转换表达式。Both spectral and pseudo-spectral acceleration play an important role in the seismic design of structures.However,only one of them is specified in most seismic codes.To clarify the relationship between the two helps to obtain another spectrum from the given spectrum.Previous research on the relationship between Sa and PSa are mostly confined to the analysis of the effects of structural damping ratio and period.Recent studies have shown that magnitude,epicentral distance and site class also have an effect on the relationship between the two.In this paper,the effects of magnitude,epicentral distance and site class on the relationship between Sa and PSa are systematically discussed by statistical analysis of a large number of ground motion records(16660 seismic acceleration time histories).The results show that(1)the influence of magnitude on the relationship between Sa and PSa is very significant,and the difference between Sa and PSa decreases with the increase of magnitude;(2)The effect of site class is second to magnitude and is related to magnitude.The influence of site class on the relationship between Sa and PSa is not uniform under different magnitudes.(3)The influence of epicentral distance on the relationship between Sa and PSa is very small and can be ignored.Finally,based on these conclusions and through nonlinear regression analysis,the transformation expression of Sa and PSa considering magnitude and site class is established.

关 键 词：加速度反应谱 伪加速度反应谱 震级 震中距 场地类别 

分 类 号：TU318.1[建筑科学—结构工程]