Seismic response analysis of immersed tunnel of Hong Kong-Zhuhai-Macao Bridge under oblique seismic waves
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.
oblique incidence of seismic waveHong Kong-Zhuhai-Macao Bridgeimmersed tunnelviscoelastic bound-aryfinite element
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