锚索突断下悬浮隧道的动力特性数值研究  

Numerical study on dynamic characteristics of submerged floating tunnel under abrupt cable⁃breaking

作　　者：房玉林 李静[1] 陈健云[1] 刘迁苹 FANG Yulin;LI Jing;CHEN Jianyun;LIU Qianping(School of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学建设工程学院,辽宁大连116024

出　　处：《大连海事大学学报》2024年第3期132-142,共11页Journal of Dalian Maritime University

基　　金：国家重点研发计划项目(2022YFB2602800)。

摘　　要：针对一种海湾跨越的创新型工程结构——水下悬浮隧道(SFT),以日本喷火湾的SFT设计方案为对象,结合ABAQUS有限元分析软件,建立SFT的三维实体模型,分析跨中及端跨位置的单根锚索断裂、多根锚索连续断裂情况下,水下悬浮隧道的侧向变形和扭转运动响应特性,通过参数敏感性分析了重浮比对断索响应的影响。结果表明,跨中连续两根锚索断裂较单根锚索断裂下的最大扭转角度响应增加了近三倍,竖向位移响应增加了近一倍;增大锚索安全系数对避免连续断索十分重要。另外,提出了适用于动力响应分析的SFT等效模型,可以准确反映隧道整体的动力特性及各种荷载下的变形特性。Aiming at an innovative engineering structure spanning the bay,the submerged floating tunnel(SFT),the three⁃dimensional solid model of SFT was established by using ABAQUS finite element analysis software,and taking the SFT design scheme of Funkawan Bay in Japan as the object.The lateral deformation and torsional motion response characteris tics of the SFT were analyzed under the conditions of single cable break and multiple cables continuous break,and the influence of Weight⁃Buoyancy Ratio(WBR)on cable break response was discussed through parameter sensitivity analysis.The results show that the maximum torsional angle response and vertical displacement response of two consecutive anchor cable failures at the mid span increase by nearly three times and double respectively compared to a single anchor cable failure.Increasing the safety factor of the cable is significantly important to avoid continuous cable⁃breaking.In addition,the SFT equivalent model for dynamic responses analysis is proposed,which can accurately reflect the dynamic characteristics of the whole tunnel and the deformation characteristics under various loads.

关 键 词：水下悬浮隧道(SFT) 锚索断裂 响应特性 鱼骨梁等效模型 

分 类 号：TV36[水利工程—水工结构工程]