预应力闸墩三维有限元分析及其优化方案研究  

3D FEM Analysis of Prestressed Gate Pier and Study on Its Optimization Scheme

作　　者：韦海勇[1] 王满玉 冯晓波[2] 李馨馨[2] WEI Hai-yong;WANG Man-yu;FENG Xiao-bo;LI Xin-xin(Guangxi Water and Power Design Institute,Nanning 530023,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China)

机构地区：[1]广西水利电力勘测设计研究院,南宁530023 [2]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《中国农村水利水电》2018年第9期176-181,共6页China Rural Water and Hydropower

摘　　要：洋溪水利枢纽工程溢流坝弧门推力达70 000 kN,在国内已建和在建枢纽中位居前列,必须采用预应力闸墩以改善闸墩的应力状态及控制闸墩的变形。采用有限单元法对该工程预应力闸墩进行应力~应变分析,计算对比了3种支承结构形式方案(混凝土深梁式、钢结构深梁式和钢锚块式方案)下预应力闸墩的结构特性和应力状态,据此选取最优方案,并通过优化分析确定了锚索轴向拉力最优设计值。结果表明:钢梁和钢锚块方案中闸墩混凝土拉应力控制效果要优于混凝土深梁方案的控制效果,且钢锚块方案中闸墩颈部压应力分布不均匀,因此选定钢梁方案为优化方案,且建议主锚索轴向拉力控制在3 610 kN。The bearing loads and structural characteristics of spillway dam middle piers of the Yangxi Water Conservancy Project are extremely complex,and the thrust of working arc gate reaches 70 000 kN. The stress and strain analysis of the prestressed gate pier for the project is performed by using finite element method. In this paper,the structural characteristics and stress state of the prestressed gate pier are compared with three kinds of supporting structure schemes（ including concrete deep beam scheme,steel structure deep beam scheme and steel anchor block scheme）,and the optimal scheme is selected. Further,the optimal design value of anchor cable axial tension is determined by optimizing analysis. The result shows that the schemes of steel structure and steel anchor block are superior to that of concrete deep beam with respect to the control of tensile stress within concrete,and the compressive stress distribution at the pier neck of the steel anchor block scheme is uneven. Therefore,the scheme of steel beam is chosen as the optimal one and it is suggested that the main anchor cable axial tension should be controlled in 3 610 kN. These results could be certain references for similar projects of prestressed gate pier.

关 键 词：预应力闸墩 支承结构 应力-应变特性 有限单元法 优化分析 

分 类 号：TV662.2[水利工程—水利水电工程]