地震波斜入射下层状场地中地下综合管廊地震响应分析  

Seismic response analysis of the utility tunnel in layered site under obliquely incident seismic wave

作　　者：周晓洁 梁清华 刘中宪 何颖 ZHOU Xiaojie;LIANG Qinghua;LIU Zhongxian;HE Ying(Tianjin Key Laboratory of Civil Buildings Protection and Reinforcement,Tianjin 300384,China;School of Civil Engineering,Tianjin Chengjian University,Tianjin 300384,China)

机构地区：[1]天津市土木建筑结构防护与加固重点实验室,天津300384 [2]天津城建大学土木工程学院,天津300384

出　　处：《世界地震工程》2018年第3期32-45,共14页World Earthquake Engineering

基　　金：国家自然科学基金资助(项目批准号:51678389; 51678390)

摘　　要：利用黏弹性人工边界和等效地震荷载时域波动输入方法,结合土层和半空间的精确动力刚度矩阵,实现了地震波斜入射下层状场地地下综合管廊地震反应分析,建立了不同场地条件下地下综合管廊分析模型。计算结果表明:地震波倾斜入射情况下,综合管廊结构地震响应与垂直入射时具有显著差异,一般SV波以30°临界角附近入射时结构地震反应最为剧烈;地下综合管廊动应力集中主要分布在管廊角部、中柱上下端;成层土波速结构变化对地下综合管廊地震反应亦具有显著影响。总体上看:当穿越软夹层时管廊结构地震反应更为剧烈,且覆盖层越厚,管廊结构内力幅值越大。因此地下综合管廊结构抗震设计宜考虑地震波倾斜入射及场地土层性质的影响。Using viscoelastic artificial boundary and the time-domain seismic wave of equivalent seismic load, and exact dynamic stiffness matrices in soil layer and half-space, seismic response of the utility tunnel in layered site under the obliquely incident seismic wave was analyzed. The analysis models of the utility tunnels under different site conditions were established. The results are as follows. （1） The dynamic responses of the utility tunnel under the obliquely incident seismic waves differ significantly from those under vertically incident seismic waves, and the structural seismic response is the maximum while incident angle of SV wave is close to the critical angle of near 30~. （2） The dynamic stress concentration of the utility tunnels is mainly distributed in the corner of the tunnels and the upper and lower ends of the middle columns. （3） The variation of the wave-velocity structure in the lay- ered soil has a significant influence on the seismic response of the utility tunnels. Generally, the seismic response of the utility tunnels is more intense when they pass through the soft interlayer, and the thicker the covering layer, the greater the internal force amplitude of the tunnels. Therefore, the seismic design of the utility tunnel structure should consider the influence of both obliquely incident seismic waves and soil layer properties.

关 键 词：地震波倾斜入射 地下综合管廊 黏弹性人工边界 等效地震荷载 层状场地 

分 类 号：TU435[建筑科学—岩土工程] TU375[建筑科学—土工工程]