动水力作用时矩形空心墩刚构桥地震响应分析  

Seismic response analysis of a rectangular hollow rigid frame bridge under hydrodynamic pressure

作　　者：冀伟[1] 刘世忠[1] 

机构地区：[1]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070

出　　处：《世界地震工程》2010年第2期1-6,共6页World Earthquake Engineering

基　　金：国家自然科学基金项目(50968008)

摘　　要：建立红河大桥的三维有限元模型,采用Morison方程法将水对桥墩的影响转化为附加质量的形式考虑。对比了2种工况下桥梁的自振特性,并结合《公路桥梁抗震设计细则》中的有关规定,进行该桥的反应谱分析以及时程反应分析。分析与讨论了不同地震动输入条件下,动水力对该桥墩地震动响应的影响程度。结果表明水的存在会改变结构动力特性和地震动响应。因此在进行抗震设计时考虑动水压力的作用是非常必要的。The three-dimension finite element analysis model of the Honghe Bridge is proposed by considering water effect on base of piers in Morison Equation.The natural frequencies of the bridge are discussed and compared under two different conditions.Combined with Chinese bridge seismic design code,the bridge response spectrum analysis and time-history analysis are implemented.The interaction between the structure and water is studied under various earthquake records.The effect of hydrodynamic force on the bridge are analysed and discussed.The results of test indicate that the water would change the dynamic characteristics and the responses of structures.The effect of hydrodynamic pressure on bridge piers is vital importance in seismic design.

关 键 词：矩形空心墩 动水压力 有限元法 附加质量 地震响应 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] P315.96[交通运输工程—道路与铁道工程]