俯冲带浅壳和上地幔地震竖向位移谱阻尼修正系数模型  

A damping modification factor model for vertical displacement spectrum from shallow crustal and upper mantle earthquakes in subduction zone

作　　者：刘名吉 张洪博 康莉莉 LIU Mingji;ZHANG Hongbo;KANG Lili(School of Civil Engineering,Shandong Jianzhu University,Jinan 250000,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250000

出　　处：《地震工程与工程振动》2020年第4期204-215,共12页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51878396)。

摘　　要：基于日本K-NET和KiK-net强震台网获取的7635条浅壳和上地幔地震记录的统计分析,考虑阻尼比,谱周期点及场地类别的影响,采用最小二乘法建立竖向位移谱阻尼修正系数模型,并通过随机效应模型分离出模型残差及其标准差,探究各参数对模型随机误差的影响。研究表明:采用一个简单的阻尼比对数的二次式能很好的模拟阻尼比的影响;模型事件间残差与震级显著相关,事件内残差与震源距离的相关性较大;在周期0.6 s前,震源效应引起的随机误差小于其他效应引起的随机误差,但0.6 s后,场地效应引起的随机误差较其他效应引起的随机误差小;在整个周期上,路径效应与其他效应引起的随机误差占比大。文中的研究结果可直接用于调整不考虑震源及震源距的设计反应谱。A damping modification factor can be used to adjust the response spectrum with a damping ratio of 5%from seismic design codes and/or a probabilistic seismic hazard analysis in order to derive a design spectrum with the desired damping ratio.DMF is important for the design of these structures.A DMF model is presented for the displacement spectrum of the vertical strong-motion records from the shallow crustal and upper mantle earthquakes in Japan.The coefficient model is used to separate the model residuals and their standard deviations by random effects model,and to explore the influence of each parameter on the random error of the model.The research shows that a simple quadratic function of the damping ratios in a logarithm scale was used to model the effect of damping ratios and the quadratic function of the damping ratio equal 1.0 when the damping ratio equals 5%;the between-event residuals is significantly correlated with the magnitude,and the correlation between-event residuals and the source distance is large;Before 0.6 s,the random error caused by the focal effect is smaller than the random error caused by other effects,but after 0.6 s,the random error caused by the site effect is the smallest;the path effect and the random error caused by other effects account for a large proportion in the whole cycle.The results of this paper can be directly used to adjust the design response spectrum without considering the source and source distance.

关 键 词：阻尼修正系数 位移反应谱 竖向地震动 浅壳和上地幔地震 残差标准差 

分 类 号：P315.9[天文地球—地震学]