摘要
斜入射地震波引起的非一致性地震动对地下管廊、沉管隧道等细长结构影响明显。在细长结构抗震中,需要考虑地震动的非一致性。针对港珠澳大桥沉管隧道,采用黏弹性人工边界的方法建立三维有限元模型,对比分析P波、SV波和SH波在不同角度斜入射下的隧道动力响应。研究结果表明:不同的入射波、不同的角度在隧道中的响应差别显著。P波、SH波作用下结构加速度随入射角的变化先增大后减小,SV波作用下结构加速度随入射角增大而减小。相较于自下而上的垂直入射,地震波斜入射下结构应力响应被明显放大且不同入射波下结构应力响应的分布特点不同,P波在隧道顶、底板的中部的应力较大,SV波作用下结构纵向非一致性表现得更明显,SH波在隧道侧墙、中隔墙与顶底板相交的角点区以及两个斜向板块应力较大。随着入射角度增大,P波、SV波应力逐渐增大,SH波应力逐渐减小。
The non-uniform ground motion caused by oblique incident seismic waves has an obvious influence on slen-der structures such as underground pipe gallery and immersed tunnel.In the seismic resistance of slender structures,the inconsistency of ground motion needs to be considered.Aiming at the immersed tunnel of Hong Kong-Zhuhai-Macao Bridge,a three-dimensional finite element model is established by using viscoelastic artificial boundary method,and the dynamic response of tunnel under oblique incidence of P wave,SV wave and SH wave at different angles is compared and analyzed.The results show that the response of different incident waves and different angles in the tunnel is signifi-cantly different.Under the action of P wave and SH wave,the structural acceleration increases first and then decreases with the change of incident angle.Under the action of SV wave,the structural acceleration decreases with the increase of incident angle.Compared with the vertical incidence from bottom to top,the stress response of the structure under the oblique incidence of seismic wave is obviously amplified and the distribution characteristics of the structural stress re-sponse under different incident waves are different.The stress of P wave in the middle of the tunnel roof and floor is larg-er,and the longitudinal inconsistency of the structure under the action of SV wave is more obvious.The stress of SH wave is larger in the tunnel side walls,in the corner point area where the diaphragm walls intersect the tunnel roof and floor,and in the two diagonal slabs.With the increase of incident angle,the stress of P wave and SV wave increases gradually,and the stress of SH wave decreases gradually.
作者
杜闯
高启辉
宋帅
DU Chuang;GAO Qihui;SONG Shuai(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China)
出处
《河北工业大学学报》
CAS
2024年第3期76-86,共11页
Journal of Hebei University of Technology
基金
国家自然科学基金资助项目(52061160367)
河北省高等学校科学研究项目(ZD2022140)。
关键词
地震波斜入射
港珠澳大桥
沉管隧道
黏弹性边界
有限元
oblique incidence of seismic wave
Hong Kong-Zhuhai-Macao Bridge
immersed tunnel
viscoelastic bound-ary
finite element
