长周期地震动参数与隔震结构响应参数的相关性研究  

Research on the Correlation between Ground Motion Intensity Indexes and Maximum Response of the Isolation System

作　　者：张亮泉[1] 客金保 ZHANG Liangquan;KE Jinbao(School of Civil Engineering,Northeast Forestry University,Harbin 150040,Heilongjiang,China)

机构地区：[1]东北林业大学土木工程学院,黑龙江哈尔滨150040

出　　处：《地震研究》2022年第1期17-25,共9页Journal of Seismological Research

基　　金：中央高校基本科研业务费专项资金项目(2572014CB23);国家自然科学基金项目(51678543)联合资助.

摘　　要：从Chi-Chi地震动数据中选取20条近场长周期地震记录和20条远场长周期地震记录,再从汶川地震渭河地震动数据中选取20条远场长周期地震记录作为输入,研究各个地震动记录相对应的地震动强度参数及其之间的相关性,筛选出了适合于长周期地震动的地震动强度指标,采用Pearson相关系数对筛选出的地震动强度指标与隔震体系的隔震层位移响应之间的相关性进行分析。结果表明:①在近、远场长周期地震动作用下,中长周期隔震结构的隔震层位移响应与频谱特征参数的相关性比较好,在进行中长周期隔震结构的抗震性能研究时,PGD、Sd_(avg)及DSI与隔震结构的相关性较好,地震动强度指标在集集近场建议选取PGD和Sd_(avg),集集远场建议选取DSI和D/V,渭河远场建议选取Sd_(avg)和DSI;②在强相关范围内考虑相关性的高低,近场和远场的长周期地震动强度指标建议分别选取PGD和DSI。Firstly,we select 60 records including 20 near-field,long-period seismic records and 20 far-field,long-period records of the processed Chi-Chi ground motion data,and 20 far-field,long-period records of the processed Wenchuan ground motion data as input ground motion.Then,we get the intensity-indexes suitable for the long-period ground motion by studying the intensity parameters corresponding to each seismic record.Then we use Pearson correlation-coefficient to analyze the correlation between the intensity-index and the maximum displacement response of the isolation system.The results show that when the isolated structures are subjected to the long-period ground motion in near-and far-field,the maximum displacement response of medium-and long-period isolated structures is well correlated with spectral characteristic parameters.When we study the aseismic performance of medium-and long-period isolated structures,we find that the indexes PGD,Sd_(avg) and DSI have a good correlation with the isolation structure.We recommend PGD and Sd_(avg) for the intensity indexes in near field,DSI and D/V for the intensity indexes in far field of Chi-Chi earthquake event.And we recommend Sd_(avg) and DSI for the intensity indexes in far field of Wenchuan earthquake event.Considering the degree of correlation of the intensity indexes with the isolated structures,we recommend PGD for the near-field,long-period intensity index,and DSI for the far-field,long-period seismic intensity index.

关 键 词：隔震结构 近场 远场 长周期地震动 地震动强度指标 

分 类 号：P315.923[天文地球—地震学]