摘要
在考虑冰-水-桥墩流固耦合的基础上,利用有限元分析软件ADINA,研究了不同水深和不同类型地震等条件下,桥墩周围固结海冰的边界范围对桥墩地震反应及动水压力的影响。结果表明:墩身位移和加速度、墩底最大弯矩和剪力随着冰体边界范围的增大而增大,但水深超过桥墩高度的4/5时,冰体边界范围对墩身位移和加速度基本无影响。同时,桥墩侧面动水压力也随着冰体边界范围的增大而增大,且增大程度越来越显著。另外,与冰体边界范围为桥墩横截面尺寸30倍时相比,冰体边界范围为桥墩横截面尺寸40倍时墩底最大弯矩和剪力可增大332.34%和245.20%以上,因此,在进行冰水域桥墩抗震设计时应着重考虑冰体边界范围为桥墩横截面尺寸30倍以上的冰体对结构地震反应的影响。
Based on the fluid-structure interaction of ice-water-bridge pier, the paper considers different earthquake types and different water depths, and studies the effect of ice mass boundary on earthquake response and hydrodynamic pressure by using ADINA. The result shows that the lager the ice mass boundary, the greater the displacement and acceleration along the pier, and the greater the bending moment and shear in the bottom. While the depth of water is beyond 4/5 of the pier, the ice mass boundary has no effectire displacement and acceleration. At the same time, the hydrodynamic pressure in the lateral of the pier becomes larger as the ice mass boundary increases, and the degree of increase is more and more remarkable. The increase rates of the bending moment and the pier shear are 332.34% and 245.2% respectively when the ratio between ice mass boundary and the size of pier cross section is 40 as compared with the ratio being 30. At last, we get a conclusion that we should consider the influence of ice mass on seismic response when the ratio of ice mass boundary range is more than 30 times than the bridge section size range in ice water seismic design of bridge pier.
出处
《海洋工程》
CSCD
北大核心
2013年第2期53-60,共8页
The Ocean Engineering
基金
国家自然科学基金资助项目(51078033)
国家自然科学基金资助项目(51178045)
关键词
桥墩
冰体边界
流固耦合
动力响应
动水压力
bridge pier
ice mass boundary
fluid-structure interaction
dynamic response
hydrodynamic pressure
