论文部分内容阅读
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。
In view of the problem of whether the internal water filling with water after opening the hollow pier of the circular cross-section pier, ANSYS-CFX is used to build the coupled model of pier-water coupling, and the dynamic characteristics of the hollow pier, Hydraulic and response effects. The results show that when the water depth is half the natural frequency of hollow piers, the natural frequency of hollow piers is reduced by 25.08% when compared with that of external water only. When the water is full, the natural frequency of hollow piers can be reduced by 39.32%. During the earthquake, the hollow pier vibrates violently and the internal water sloshing will increase the additional dynamic water pressure of the structure, thus increasing the dynamic response of the structure (the main stress increasing rate is 30.84%). At the same time, The local stress near the water hole is large (the rate of increase of equivalent stress is 9%). The influence of internal water has masked the improvement of the stress obtained by the external hydrostatic pressure of internal water balance. From the perspective of seismic effect, the design of deep- Not in the hole.