摘要
为研究动水效应对地震作用下深水桥墩的影响,以一深水矩形桥墩为例,分别基于势流体理论和粘性流体的N-S方程,建立了深水桥墩-水耦合系统有限元模型,分析探讨了深水桥墩动力特性以及在简谐地震作用下的动力响应规律。结果表明:墩-水耦合作用使得深水桥墩的自振周期增大,且对桥墩纵桥向自振周期的影响要大于横桥向;桥墩的动力响应与简谐地震荷载周期、墩-水耦合系统振动周期有关,当简谐地震荷载周期与桥墩-水耦合系统的自振周期接近时,墩-水耦合作用将会显著增大桥墩的动力响应。
A rectangular cross-section deep-water bridge pier was taken as an example to investigate the effect of fluidstructure interaction.Finite element models of pier-water system were built based on potential fluid theory and N-S equation of viscous fluid,respectively.Model dynamic properties based potential fluid theory and model dynamic responses based on N-S equation under harmonic earthquake loading were then calculated and analyzed.The experimental results indicate that percentage increases of vibration periods with respect to dry vibration periods are determined as a function of water level,and the effect of pier-water interaction on pier vibration periods of longitudinal direction is greater than those of transverse direction.Dynamic responses are related to the period of applied harmonic earthquake loading and the vibration periods of pier-water system,when the periods of the harmonic earthquake loading and the pier-water system are close to each other,the dynamic responses are remarkably increased due to the fluid-structure interaction.
作者
邓育林
乔玉博
郭庆康
DENG Yu-lin;QIAO Yu-bo;GUO Qing-kang(School of Transportation,Wuhan University of Technology,Wuhan430063,China)
出处
《武汉理工大学学报》
CAS
北大核心
2017年第9期51-55,共5页
Journal of Wuhan University of Technology
基金
国家自然科学基金(51378406,51678459).
关键词
深水桥墩
流固耦合
粘性流体
动力特性
动力响应
deep-water bridge pier
fluid-structure interaction
viscous fluid
dynamic properties
dynamic responses
