台风登陆期间跨海大桥风-浪-流作用结构振动分析  

Structural Vibration Analyses of the Sea-crossing Bridge under Wind-wave-current Loads during the Landfall of Typhoon

作　　者：魏凯[1] 钟茜[1] 沈忠辉 WEI Kai;ZHONG Xi;SHEN Zhonghui(State Key Laboratory of Bridge Intelligent and Green Construction,Southwest Jiaotong University,Chengdu 610031,China;Department of Hydraulic Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]西南交通大学桥梁智能与绿色建造全国重点实验室,成都610031 [2]清华大学水利水电工程系,北京100084

出　　处：《铁道标准设计》2024年第3期113-123,共11页Railway Standard Design

基　　金：国家自然科学基金项目(52222804)。

摘　　要：台风登陆时,常诱发狂风、巨浪、风暴潮等自然灾害,威胁跨海大桥的安全。开展台风登陆期间跨海大桥风-浪-流多灾害作用随机振动分析对桥梁结构设计及安全运营有重要作用。首先,介绍台风登陆期间的风-浪-流多灾害数值模拟技术,利用台风混合风场模型驱动SWAN+ADCIRC波流耦合模型实现桥址海域台风期间的风、浪、潮、流模拟。然后,总结了风、浪、潮、流荷载的计算方法,其中风荷载采用了台风风谱,波浪荷载考虑台风波浪谱及各墩非一致激励。以某跨海公铁两用大桥为例,基于台风“艾利”期间的环境参数模拟结果,并借助有限元软件ANSYS开展跨海大桥多灾害作用振动分析。研究结果表明,长期响应的统计特征可利用每次10 min的30次短期随机时程分析结果均值作为代表值,桥梁短期动力响应极值服从广义极值分布;考虑风向、波向变化对桥梁随机振动分析结果影响显著。The strong wind,huge wave and storm surges during the landfall of typhoons pose a significant threat to the safety of the sea-crossing bridge.Carrying out the dynamic response analysis of windwave-current multi-disaster action of the sea-crossing bridge under a strong typhoon is of great significance to the structural design and safe operation.In this study,the numerical simulation of typhoon-induced wind,wave and storm surge is firstly introduced.The SWAN+ADCIRC wave-current coupling model driven by the typhoon hybrid model is used to simulate the typhoon-induced wind,wave and storm surge in the nearshore island area for a sea-crossing bridge.Then,the calculation methods of wind,wave,tide and current loads are summarized.The typhoon-induced wind spectral is considered in the wind loads.Meanwhile,the wave loads take into account the typhoon-induced wave spectral and inhomogeneous excitation of each pier.A strait-crossing rail-cum-road bridge is taken as the example based on the simulation results of environmental parameters during Typhoon“Aere”.The finite element software ANSYS is used to establish the bridge finite element model for the vibration analysis of the sea-crossing bridge under typhoon-induced wind-wave-current multi disasters.The results show that the mean of 30 times short-term simulation(10 min)can be used to represent the statistical characteristics of response,the generalized extreme value distribution(GEV)is suitable to fit the extreme value of the short-term dynamic response simulation of the bridge,and the changes of wind and wave direction are significant for the random vibration of the bridge.

关 键 词：桥梁工程 跨海大桥 振动分析 台风 多灾害 波流作用 极值分布 

分 类 号：U441[建筑科学—桥梁与隧道工程] TU318[交通运输工程—道路与铁道工程]