开孔圆形截面空心桥墩水动力研究

发布时间：2018-04-12 09:46

本文选题：空心墩 + 内部水　；参考：《防灾减灾工程学报》2017年05期

【摘要】：针对圆形截面空心桥墩壁上开孔后内部充水是否带来水动力的问题,采用ANSYS-CFX构建了墩-水耦合数值分析模型,并研究了内部水对空心墩的动力特性、地震动水力及响应的影响。结果表明:当水深一半时,空心墩自振频率相比仅有外部水时降低了25.08%,当满水时,空心墩自振频率降低可达39.32%。地震时,空心墩发生剧烈振动,内部水的晃动会增加结构的附加动水力,从而加大结构的动力响应(主应力增大率为30.84%);同时存在内外域动水的交换作用,使得通水孔附近局部应力较大(等效应力增加率为9%),内部水的影响已经掩盖过内部水平衡外部静压取得的应力改善效益,从地震作用效应的角度看,深水空心桥墩设计中不宜开孔。
[Abstract]:In order to solve the problem of whether the internal water filling of hollow pier with circular section brings about hydrodynamic force after opening on the wall, the pier-water coupling numerical analysis model is constructed by using ANSYS-CFX, and the influence of internal water on the dynamic characteristics of hollow pier, the hydraulic power of ground motion and the response of the hollow pier is studied.The results show that the natural vibration frequency of hollow piers is reduced by 25.08 when the water depth is half, and by 39.3232 when the hollow piers are filled with water.During the earthquake, the hollow pier vibrates violently, and the sloshing of the inner water will increase the additional dynamic hydraulic power of the structure, thus increasing the dynamic response of the structure (the principal stress increase rate is 30.84%), and there exists the exchange of dynamic water between the inner and outer regions.The local stress near the water opening is larger (the increase rate of equivalent stress is 9%), and the influence of internal water has masked the effect of stress improvement obtained by internal water balance and external static pressure. From the point of view of seismic effect,It is not suitable to open holes in the design of deep water hollow bridge pier.
【作者单位】：西南交通大学土木工程学院;
【基金】：国家自然科学基金项目(51678491)资助
【分类号】：U443.22

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