文献类型：期刊文献

中文题名：波流与地震共同作用下跨海斜拉桥动力反应研究

英文题名：Analysis on Dynamic Response of Sea-crossing Cable-stayed Bridge under Action of Wave Current and Earthquake

作者：吴安杰 杨万理 赵雷

第一作者：吴安杰

机构：[1]贵州理工大学土木工程学院;[2]西南交通大学土木工程学院

第一机构：贵州理工学院土木工程学院

年份：2018

卷号：35

期号：11

起止页码：69-76

中文期刊名：公路交通科技

外文期刊名：Journal of Highway and Transportation Research and Development

收录：Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：国家自然科学基金项目(51678491;51108383)

语种：中文

中文关键词：桥梁工程;动力响应;有限元方法;跨海斜拉桥;波流;地震

外文关键词：bridge engineering;dynamic response;finite element method;sea-crossing cable-stayedbridge;wave-current;earthquake

摘要：为了揭示跨海深水桥梁多灾害荷载耦合作用规律,基于非线性Morison方程,建立了波浪、水流和地震联合作用下水-结构体系动力平衡方程(波浪运动描述采用非线性Stokes五阶波)。在大型通用有限元ANSYS软件上编制APDL程序,通过动力时程分析法,以某跨海深水斜拉桥为依托,研究了水对跨海深水斜拉桥结构动力特性以及动力响应的影响,并研究了地震、波浪和水流荷载对跨海深水斜拉桥结构的作用效应,阐明了三者共同作用特点。研究表明:跨海深水斜拉桥属于柔性结构,基本频率较低(基频为0. 092 835 Hz),同时周围水的存在对结构频率有降低作用,最大降幅为13. 4%,水对该跨海深水斜拉桥结构地震响应有增大作用,最大增幅为27. 6%;在波流与地震联合作用时,波流场与地震对结构振动而产生的振荡流场叠加,从而形成一个新的共存流场,联合流场将改变纯波流场的频率,使得波流荷载偏离结构既定的共振周期,从而削弱共振效应,整体流场振动频率介于单独波流场频率和地震主频之间,波流对地震响应影响可达124. 2%,波流与地震作用之间存在相互影响,因此,对处于复杂海洋环境中的跨海深水桥梁结构进行波流与地震联合作用分析是必要的。
In order to reveal the rule of coupling action of multi-hazard loads on deep sea-crossing bridges,based on the nonlinear Morison equation,the dynamic equilibrium equation of fluid-structure system under combined wave,current and earthquake loads is established（ the wave motion is described by nonlinear Stokes fifth order wave）. The APDL program is compiled on the large general finite element ANSYS software.The influence of water on the dynamic characteristics and response of the subject bridge is analyzed by dynamic time-history response analysis method,and the effect of earthquake,wave and current load on the deep sea-crossing cable-stayed bridge is investigated. Also,the coupling characteristics of earthquake,wave and current are clarified. The result indicates that（ 1） The deep sea-crossing cable-stayed bridge belongs to flexible structure,its the fundamental frequency is lower and it is 0. 092 835 Hz. The water around bridge has the effect of reducing the bridge structure frequency and augmenting seismic response,where the maximum frequency reduction rate is 13. 4% and the maximum seismic response growth rate is 27. 6%respectively.（ 2） Due to the combined action of wave and earthquake,the wave-current field and the oscillating flow field caused by the earthquake will form a new coexisting flow field. The combined flow fieldwill change the frequency of the pure wave-current field,and make the wave current load deviate from the established resonance period of the structure,thus weaken the resonance effect. The vibration frequency of the whole flow field is between the frequency of the single wave-current field and the main frequency of the earthquake. The influence of wave current on seismic response is up to124. 2%,and there exists a mutual effect between them. So the analysis on the combined action of wave,current and earthquake on deep seacrossing cable-stayed bridge in the complex ocean environment is tremendously necessary.