墩-水耦合计算模式及深水桥墩动力响应研究  

Study on pier-water interaction calculation method and dynamic response of submerged piers

作　　者：杨万理[1,2] 李乔[1,2] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]抗震工程技术四川省重点实验室,四川成都610031

出　　处：《地震工程与工程振动》2012年第3期130-137,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金面上项目(51078317);国家自然科学基金青年基金项目(51108383);中央高校基本科研业务费专项资金项目(SWJTU09BR039)

摘　　要：为了研究地震作用下动水压力对深水桥墩的影响,以声波动理论为基础,通过对流体域边界条件的简化和流体域范围的探讨,建立了一种改进的墩-水耦合有限元模型,并提出了常用深水桥墩的理想流体域范围图。分别讨论了深水桥墩在简谐荷载、地震荷载作用下的动力响应,结果表明:动水压力增大了桥墩的动力响应,增幅在20%到50%之间,不可忽视;当桥墩基频越接近简谐荷载激励频率或地震波主频有效带宽区间时,动水压力的影响越大。In order to calculate the effect of hydrodynamic pressure on submerged piers under earthquake,a modified finite element model of pier-water interaction has been proposed.This model,which is based on acoustic theory,is built after simplification of fluid boundary condition and study of fluid scope.An appropriate water scope figure is suggested for commonly used deep-water piers.Then the dynamic responses of the deep-water piers under harmonic loads and earthquake loads are discussed respectively.Results show that the hydrodynamic pressure increases the dynamic responses,the resulting increments are from 20% to 50%,which could not be ignored.When the first order frequency of pier is close to the excitation frequency of harmonic loads or earthquake＇s main frequency effective bandwidth district,the increments of hydrodynamic pressure are greater.

关 键 词：动水压力 流固耦合 深水桥墩 地震 动力响应 

分 类 号：TU311.3[建筑科学—结构工程] U441.3[建筑科学—桥梁与隧道工程]