考虑结构损伤的深水桥墩动水效应等效附加质量研究  

Study on Equivalent Additional Mass of Hydrodynamic Effect of Deepwater Pier Considering Structural Damage

作　　者：邓育林[1] 汤轲 谭金华[1] 郭庆康 DENG Yulin;TANG Ke;TAN Jinhua;GUO Qingkang(School of Transportation,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]武汉理工大学交通学院

出　　处：《武汉理工大学学报（交通科学与工程版）》2019年第4期605-610,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金项目资助(51378406)

摘　　要：以三种墩高的圆截面深水墩为对象,借助有限元软件建立墩-水相互作用的数值模型,考虑桥墩局部和整体损伤,同时考虑桥梁上部结构的影响,分析不同损伤程度及不同墩顶质量情况下的动水附加质量随水位的变化,并通过动水压力和动力特性分析进行验证.结果表明,对于不同墩高的桥墩,无论是局部损伤还是整体损伤,同一水位不同损伤程度下的动水附加质量几乎不变;考虑墩顶质量对动水附加质量的影响也不大;不同损伤程度及不同墩顶质量下动水压力沿墩身的分布规律没有改变;等效前后的数值模型自振周期拟合较好,损伤前的动水附加质量可适用于损伤后的结构动力分析中.Taking three kinds of deep-water piers with circular section of pier height as the object, the numerical model of pier-water interaction was established by means of finite element software. Considering the local and global damageof piers and the influence of bridge superstructure, the variation of hydrodynamic added mass with water level under different damages and different pier top masses was analyzed, and verified by hydrodynamic pressure and dynamic characteristic analysis. The results show that for piers with different pier heights, the hydrodynamic added mass under the same water level and different damage degrees is almost the same, regardless of the local damage or the global damage. Considering the influence of pier top quality on hydrodynamic additional quality is not significant. The distribution law of hydrodynamic pressure along pier shaft has not changed under different damage degree and different pier top mass. The natural vibration period of the numerical model before and after equivalent is well fitted, and the hydrodynamic added mass before damage can be applied to the structural dynamic analysis after damage.

关 键 词：深水桥墩 动水附加质量 桥墩损伤 墩顶附加质量 墩-水耦合 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]