水深对桥梁地震反应的影响分析  

The influence of water depth on the seismic response of bridge

作　　者：冼巧玲[1] 冯俊迎 周福霖[1] 

机构地区：[1]广州大学工程抗震研究中心,减震控制与结构安全国家重点实验室培育基地,广东广州510405

出　　处：《地震工程与工程振动》2014年第1期81-86,共6页Earthquake Engineering and Engineering Dynamics

基　　金：国家重点基础研究发展计划(2011CB013606)

摘　　要：地震激励下桥墩和周围水体的相互作用将对桥梁结构的动力响应产生较大影响。本文基于Morison方程,讨论了考虑动水压力的桥梁动力平衡方程;通过有限元分析,探讨了水深变化对桥梁动力特性的影响以及地震动分别沿顺桥向和横桥向输入时桥梁地震反应的影响程度。研究表明:动水压力改变了桥梁的动力特性,增大了桥梁的地震反应;当地震动输入方向不同时,桥墩迎水面尺寸不同,动水压力对桥梁地震反应的影响就有差异,且随相对水深的增加,桥梁地震反应明显增大。Under earthquake excitation, the interaction of the bridge piers and the water body around will have a great impact on the dynamic response of the bridge in deep water. Based on Morison equation, this paper discusses the dynamic equilibrium equation of bridge under hydrodynamic pressure. By the finite element analysis, the effect of water depth and the earthquake input direction on the dynamic characteristics and seismic response of the bridge have been investigated. The analysis results show that the hydrodynamic pressure will change the dynamic charac- teristics and increase the seismic response of the bridge. The effect of the hydrodynamic pressure on the seismic re- sponse of the bridge will vary with the size of the bridge pier on water side and the earthquake input direction. With the increasing of the relative water depth, the seismic response of the bridge will increase obviously.

关 键 词：桥梁 动水压力 水深 地震反应 

分 类 号：TU311.3[建筑科学—结构工程] U442[建筑科学—桥梁与隧道工程]