基于流固耦合的重力式复合结构模态分析

Vibration Analysis of Gravity Type Complex Structure Based on Fluid-Solid Coupling

重力式复合结构作为一种新型码头结构,是重力式结构与桩基结构的结合,具有受力合理、造价较低和施工方便的特点。利用软件ANSYS-Workbench,以斜桩-重力式复合结构为研究对象,建立三维数值模型,分别模拟此结构在不同水位下的振动特性,探讨流固耦合作用对结构振动特性的影响。结果表明,流固耦合作用会引起结构固有频率减小,这种作用随着淹没深度的增加而增加。

As a new type of wharf structure,the gravity type complex structure is the combination of gravity structure and piling structure and has characteristics of rational load-carrying capability,lower cost and convenient construction.However,the influence of water on port structures was not considered in the previous researches.This paper takes the declining pile-gravity type complex structure as the research object and establishes a 3D finite element mode by using ANSYS-Workbench software,so that the vibration characters under the conditions of different water levels are simulated respectively and the effects of fluid-solid coupling on the vibration character of structure are discussed.The results show that the fluid-solid coupling can lead to the decrease of the natural frequency of structure,and such effect can increase with the submerging depth of the structure.