地震研究

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、Sdavg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Sdavg,集集远场建议选取DSI和D/V,渭河远场建议选取Sdavg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,Sdavg and DSI have a good correlation with the isolation structure.We recommend PGD and Sdavg 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 Sdavg 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.

引言
1 近、远场地震记录与地震动强度指标选取
2 地震动参数之间相关性分析
3 地震动参数与结构之间相关性分析
4 不同强度地震动水平作用下结构反应的不确定分析
5 结论

图1 本文研究选取的长周期地震记录加速度反应谱<br/>Fig.1 Acceleration response spectra of long-period seismic records selected in this study

图1 本文研究选取的长周期地震记录加速度反应谱
Fig.1 Acceleration response spectra of long-period seismic records selected in this study

表1 本文研究选用的长周期地震动基本信息<br/>Tab.1 Basic information of long-period ground motions selected in this study

表1 本文研究选用的长周期地震动基本信息
Tab.1 Basic information of long-period ground motions selected in this study

表2 地震动强度指标<br/>Tab.2 Earthquake motion intensity index

表2 地震动强度指标
Tab.2 Earthquake motion intensity index

图2 长周期地震动参数相关性分析<br/>Fig.2 Correlation coefficients of long-period seismic records

图2 长周期地震动参数相关性分析
Fig.2 Correlation coefficients of long-period seismic records

图3 隔震结构等效模型<br/>Fig.3 Equivalent model of the seismic isolation structure

图3 隔震结构等效模型
Fig.3 Equivalent model of the seismic isolation structure

图4 修正双线性模型<br/>Fig.4 Modified bilinear model

图4 修正双线性模型
Fig.4 Modified bilinear model

图5 不同地震动强度指标的敏感性分析<br/>Fig.5 Sensitivity analysis of different seismic intensity indexes

图5 不同地震动强度指标的敏感性分析
Fig.5 Sensitivity analysis of different seismic intensity indexes

表3 地震动参数对应的地震动强度值<br/>Tab.3 Ground motion intensity corresponding to ground motion parameters

表3 地震动参数对应的地震动强度值
Tab.3 Ground motion intensity corresponding to ground motion parameters

图6 3种强度下结构位移的离散性<br/>Fig.6 Dispersion of structural displacements subjected to three kinds of ground motions

图6 3种强度下结构位移的离散性
Fig.6 Dispersion of structural displacements subjected to three kinds of ground motions

陈波.2013.结构非线性动力分析中地震记录的选择与调整方法[D].北京:中国地震局地球物理研究所.
韩建平,周伟,李慧.2011.基于汶川地震数据的地震动强度指标与中长周期SDOF体系最大响应相关性[J].工程力学,28(10):185-196.
韩建平,周伟.2010.基于汶川地震记录的地震动强度指标与SDOF体系响应的相关性[J].土木工程学报,43(S1):10-15.
胡进军,赵泽锋,谢礼立.2020.考虑场地类别和断层距的地震动及结构响应参数相关性分析[J].地震工程与工程振动,40(2):13-22.
李雪红,李晔暄,吴迪,等.2014.地震动强度指标与结构地震响应的相关性研究[J].振动与冲击,33(23):184-189.
李宗超,陈学良,吴健,等.2018.台湾地区花莲地震(MS6.5)工程地震动参数特征分析[J].建筑结构,48(S2):308-313.
刘亭亭,于晓辉,吕大刚.2020.基于偏最小二乘回归的地震动复合强度参数构造与统计性分析[J].建筑结构学报,41(S1):406-416.
王焕定,付伟庆,刘文光,等.2006.规则隔震结构等效简化模型的研究[J].工程力学,23(8):13-22.
叶列平,马千里,缪志伟.2009.结构抗震分析用地震动强度指标的研究[J].地震工程与工程振动,29(4):9-22.
张亮泉,于建杰.2019.近、远场长周期地震动界定及分类研究[J].自然灾害学报,28(2):29-36.
钟菊芳,陈功.2020.沿深度方向地震动相干函数影响因素分析[J].地震研究,43(4):720-731.
Lee W H K,Shin T C,Kuo K W, et al.2001.CWB free-field strong-motion data from the 21 September Chi-Chi,Taiwan,Earthquake[J].Bulletin of the Seismological Society of America,91(5):1370-1376.
GB 50011—2010,建筑抗震设计规范(2016版)[S].

备注

引言

1 近、远场地震记录与地震动强度指标选取

2 地震动参数之间相关性分析

3 地震动参数与结构之间相关性分析

4 不同强度地震动水平作用下结构反应的不确定分析

5 结论

期刊信息