摘要
随着经济社会的发展及交通需求的快速增长,越来越多的跨海桥梁相继兴建。与陆地桥梁相比,深水桥梁所处的荷载环境更为复杂,可能会受到地震、波浪和海流的联合作用,这对桥梁的建造与服役安全带来巨大挑战。本文以深水桥梁单桩为研究对象,采用考虑流固耦合效应的三维精细化数值模拟方法,在最不利地震方向及起振时刻下,通过改变结构参数(水中基频、弹性模量、截面尺寸)、波流参数(流速、波高、水深、周期)以及地震动参数(PGA、地震动类型),系统性地研究了波流作用对地震下深水桥梁桩基动力响应的影响程度及机理。研究结果表明,波流作用对地震下深水桥梁桩基动力响应的影响随着结构弹性模量、截面尺寸以及地震动PGA的增大而减小,而随着波高、水深的增大而增大,随流速、波浪周期的增大先减小后增大,并随着结构自振基频接近波浪频率或远离地震动主频而增大;对于本文所分析的工况,波流作用对地震下深水桥梁桩基动力响应的影响程度大多集中10%~90%之间,因此深水桥梁抗震设计不应忽略波流作用的影响。
With the development of economy and society as well as the rapidly increasing demand for transportation,more and more sea-crossing bridges have been constructed.Compared with land bridges,deep-water bridges are subjected to more complex loading environments,such as coupled earthquake and wave-current actions,which brings great challenges to the safety of bridges during both construction and service.Aiming to reveal the extent and mechanism of the effect of wave-current action on seismic responses of deep-water bridge pile foundation,a single pile of a deep-water bridge was systematically analyzed in this study,supported by a refined three-dimensional numerical model considering the fluid-solid interaction.The analysis was conducted under the most unfavorable moment of shaking occurrence and direction of earthquake,while considering different structural parameters(including the natural frequency in water,elastic modulus and cross-sectional dimension),wave-current parameters(including current velocity,wave height,water depth and wave period)and earthquake parameters(including PGA and the type of earthquake).The results showed that the effect of wave-current action on seismic responses of deep-water bridge pile foundation decreases with the increase of elastic modulus,cross-sectional dimension and PGA,while increases with the increase of wave height and water depth.With increasing current velocity and water period,the effect of wave-current action initially decreases and then increases.Moreover,the effect of wave-current action is more significant when the structural natural frequency is close to the wave frequency or far from the dominant frequency of earthquake.For the conditions analyzed in this study,the effect of wave-current action on the dynamic responses of deep-water bridge pile foundation under earthquake mostly ranges from 10%to 90%,indicating that the effect of wave-current action cannot be neglected in the seismic design of deep-water bridges.
作者
王中兴
刘梅
李梦屿
韩庆华
WANG Zhongxing;LIU Mei;LI Mengyu;HAN Qinghua(National Science Center for Earthquake Engineering,Tianjin University,Tianjin 300350,China;School of Civil Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration(Tianjin University),Tianjin 300350,China)
出处
《地震工程与工程振动》
北大核心
2026年第1期42-54,共13页
Earthquake Engineering and Engineering Dynamics
基金
国家地震工程科学中心自主课题(2025ZZB2004)
天津市应用基础研究项目(22JCZDJC00200)
天津市青年科技人才项目(QN20230306)。
关键词
深水桥梁桩基
数值模拟
地震-波流联合作用
地震响应
参数分析
deep-water bridge pile foundation
numerical simulation
coupled earthquake and wave-current action
seismic response
parameter analysis
