基于强震记录的大阪盆地竖向地震动的放大效应研究  

Study on Amplification Effect of Vertical Seismic Motion of Osaka Basin Based on Strong Earthquake Records

作　　者：杨城[1] 张光鑫 YANG Cheng;ZHANG Guangxin(Jiangsu Key Laboratory of Structural Engineering,Suzhou University of Science and Technology,Suzhou Jiangsu 215011 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215011

出　　处：《江苏建筑》2024年第4期22-25,共4页Jiangsu Construction

摘　　要：文章基于日本KIK-net强震观测台网,分离大阪盆地水平向与竖向分量S波和盆地次生波,并为研究竖向地震动与水平向的关系,采用井上井下谱比法分析。研究表明,盆地中竖向分量S波和盆地次生波放大倍数虽整体小于水平分量,但在不同周期内不同盆地深度竖向S波、次生波放大均有超抗震设计时,竖向地震动峰值取水平峰值的最大值2/3;盆地S波与次生波对浅层土层竖向地震动的影响明显大于深层土层,并且在长周期中影响逐渐增大。Based on the Japanese KIK-net strong earthquake observation network,the horizontal and vertical components of S-wave and secondary wave in the Osaka Basin are separated in the paper.To study the relationship between vertical seismic motion and horizontal direction,the surface-to-borehole spectral ratio method is used.Research has shown that,although the amplification factor of the vertical component S-wave and the secondary wave in the basin is generally smaller than the horizontal component,the vertical seismic peak value of the vertical seismic motion at different depths of the basin is 2/3 of the maximum horizontal peak value in different periods,and the amplification factor of the vertical S-wave and secondary wave exceeds the seismic design,the influence of basin S-wave and secondary wave on vertical seismic motion in shallow soil layers is significantly greater than that in deep soil layers,and the influence gradually increases over long periods.

关 键 词：大阪盆地 井上井下谱比法 竖向地震动 放大倍数 

分 类 号：TU435[建筑科学—岩土工程]