地震P波斜入射下入射角度对海底沉管隧道结构动力响应的影响  

Effect of oblique incident angle of P-wave on submarine immersed tunnels

作　　者：周鹏[1] 崔杰[1] 李亚东[1] 欧阳志勇[1] 

机构地区：[1]广州大学工程抗震研究中心,广东广州510405

出　　处：《世界地震工程》2016年第3期78-85,共8页World Earthquake Engineering

基　　金：国家自然科学资金重点项目(51438004);国家重点基础研究发展计划973计划(2011CB013606);教育部创新团队发展计划项目(IRT13057)

摘　　要：基于粘弹性人工边界条件理论,将地震动输入转化为作用于人工边界的等效荷载来实现波动的输入,利用有限元软件ADINA建立了海水-沉管隧道-海床的整体分析模型,在模型的海水与海床的交界面处设置流固耦合边界来考虑海水与海床的流固耦合动力反应,分析了地震P波斜入射作用下,不同入射角度对沉管隧道结构的动力响应的影响。结果表明:地震动的入射角度对海底沉管隧道结构的动力反应影响很大,而且入射角在某个范围内,水平向和竖向地震响应有着不同的影响程度;随着入射角度不断增大,结构在竖向的动力响应明显减小,而在水平向的动力响应是先增大后减小。因此,对海底沉管隧道进行抗震设计分析时,应该考虑地震动斜入射对结构动力响应的影响。Based on the theory of viscous - spring artificial boundary, the input of ground motion is transformed into equivalent load on artificial boundary. The integrate analysis model of sea water - immersed tunnels - seabed is es- tablished by using finite element software ADINA. The effect of oblique incident angle of P - wave on structural dy- namic response of submarine immersed tunnels is analyzed. It is found that the incident angle of ground motion has great effect on submarine immersed tunnels＇ structural dynamic response, and it has different degree effect on hori- zontal and vertical earthquake response when the incident angle in some ranges; with the oblique incident angle in- creases, the vertical structural response decreases obviously, while the horizontal response increases firstly and then decreases. Hence the oblique incident angle of ground motion should be considered when the seismic design and a- nalysis of submarine immersed tunnels is conducted.

关 键 词：粘弹性人工边界 海水-沉管隧道-海床 斜入射 入射角度 地震响应 

分 类 号：TU378[建筑科学—结构工程]