考虑流固耦合的矩形渡槽动力分析

针对大型矩形渡槽的动力分析问题,建立流固耦合(FSI)系统的位移-压力(ui,p)有限元格式,固体域以位移为自由度,流体域以压力为自由度,给出流固耦合系统的动力特性方程;并基于FSI的(ui,p)格式建立槽体-水体-槽墩-基础-地基系统的力学计算模型,采用模态分析法和拟静力法分别求解6种水深(空槽、1/4水深、半槽水深、3/4水深、设计水深、满槽水深)下渡槽的动力特性和动力响应.计算结果表明,基于FSI系统的(ui,p)格式,考虑了槽体与水体的相互作用,提高了计算精度,同时也得出不同水深下渡槽结构动力特性和动力响应的变化规律.

Dynamic Analysis with Fluid-Solid Interaction of Rectangular-sectioned Aqueduct

Aimed at dynamic analysis of rectangular-sectioned aqueduct,the displacementpressure(ui,p) finite element formation was established.The degree of freedom of displacement was adopted in solid regions,and the degree of freedom of pressure adopted in fluid regions.And the aqueduct structure with the body of aqueduct-water-cluster-grounding-foundation was considered as a whole system based on(ui,p) formation,Finally the natural frequencies and mode shapes were obtained under the following 6 cases,such as empty water level,1/4 water level,1/2 water level,3/4 water level,design water level and full water level.By using the quasi-static method,the dynamic responses were obtained.The calculated results indicate that the above method has a higher accuracy,and the variation graphs of the natural properties and dynamic responses of the aqueduct structure under different depths of water are also drawn.