考虑流固耦合的矩形渡槽动力分析
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摘要
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.
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.
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.
引文
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[2]白新理,张多新,马文亮.南水北调工程建设重大关键技术研究与应用[R].郑州:华北水利水电学院,2008.
[3]李声平,彭翠玲,吴杰芳.大型U型双槽结构动力分析[J].长江科学院院报,2005,22(4):68-71.
[4]徐建国,陈淮,王博,等.考虑液固动力相互作用的大型渡槽地震响应研究[J].土木工程学报,2005,38(5):67-73.
[5]李涛峰,白新理,张多新.大型渡槽结构动力响应分析[J].南水北调与水利科技,2007,5(4):79-82.
[6]王勖成,邵敏.有限单元法基本原理和数值方法(第二版)[M].北京:清华大学出版社,2003:522-544.
[7]杨开云,白新理.结构分析软件应用[M].北京:北京理工大学出版社,2005:45-93.
[8]中国水利水电科学研究院.SL203-97水工建筑物抗震设计规范[S].北京:中国水利水电出版社,1999:14-23.
[9]郭继武.建筑抗震设计(第二版)[M].北京:中国建筑工业出版社,2006:114-214.
[10]张建华,杨志超,兰文致.矩形沙河渡槽的动力响应分析[J].华北水利水电学院学报,2009,30(1):23-27.
[11]季日臣,陈尧隆,房振叶.大型多纵梁矩形渡槽受力分析与结构形式选择[J].水力发电学报,2007,26(3):49-54.
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