考虑子盆地影响的二维盆地非线性地震反应研究  

Study of Nonlinear Seismic Response in Two-dimensional Basins Considering the Influence of Sub-basins

作　　者：陈凌宇 CHEN Lingyu(Suzhou University of Science and Technology,Jiangsu Key Laboratory of Structural Engineering,Suzhou Jiangsu 215009 China)

机构地区：[1]苏州科技大学,江苏省结构工程重点实验室,江苏苏州215009

出　　处：《江苏建筑》2024年第5期23-25,50,共4页Jiangsu Construction

摘　　要：当前对盆地内子盆地对地震动放大效应的研究还较少,建立二维沉积盆地与子盆地黏弹性和非线性地震响应分析的有限元模型。结果表明:(1)聚焦效应让模型的主要放大区域集中在子盆地范围内。(2)相同阻抗比下黏弹性模型子盆地共振频率差值不到0.2 Hz,非线性模型差值在0.3 Hz以内;不同阻抗比下共振频率差值最大接近0.8 Hz,既有复杂地震波的影响,也有阻抗比的影响。(3)地震波对盆地地震响应有显著影响,地震波越强烈,土的非线性越强,子盆地的放大以及共振频率也越小。The current research on the seismic amplification effects of sub-basins within basins is relatively limited.In this study,a finite element model for the analysis of the viscoelastic and nonlinear seismic response of two-dimensional sedimentary basins and their sub-basins is established.The results indicate the following:(1)The focusing effect concentrates the main amplification areas of the model within the sub-basin range.(2)For the same impedance ratio,the difference in resonance frequencies in the viscoelastic model within the sub-basin is less than 0.2 Hz,and within the nonlinear model,it is within 0.3 Hz.For different impedance ratios,the maximum difference in resonance frequencies approaches 0.8 Hz,influenced by both complex seismic waves and impedance ratios.(3)Seismic waves significantly affect the seismic response of the basin.Stronger seismic waves lead to stronger soil nonlinearity,resulting in smaller amplification and resonance frequencies within the sub-basin.

关 键 词：子盆地 黏弹性人工边界 等效线性化 地震响应 

分 类 号：P315.9[天文地球—地震学]