小湾拱坝放空底孔预应力闸墩三维有限元分析
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摘要
采用三维有限元方法,应用ANSYS程序对小湾拱坝放空底孔预应力闸墩进行了空间应力与变形计算,并详细探讨了预应力的模拟方法,对3种不同方法的优缺点进行了对比评价.根据计算结果,对比分析了多个设计工况下闸墩结构的变形、应力分布规律,评价了预应力锚索的预压效果.在此基础上,取闸墩结构特征点的第一主应力作为优化变量,对预应力锚索设计吨位和布置方案进行了敏感性分析,得出了预应力锚索布置的优化方案.全部研究成果为小湾拱坝施工设计详图所采用.
The spatial stresses and deformations for the prestressed piers of amptying bottom outlets in Xiaowan arch dam are analyzed by ANSYS program;and three simulation methods of prestressed cable and their advantages and disadvantages are compared and evaluated.Acoording to the calculation results,the distribution law of deformations and stresses of pier structure under design conditions are analyzed and the precompressed effect of prestressed cable is discussed.On this base,by taking the first stress of feature points as optimization variables,sensitivity analysis of design forces and layout scheme of prestressed cable is studied;and a better scheme is obtained.Research results are used by the design detail drawings of Xiaowan arch dam.
The spatial stresses and deformations for the prestressed piers of amptying bottom outlets in Xiaowan arch dam are analyzed by ANSYS program;and three simulation methods of prestressed cable and their advantages and disadvantages are compared and evaluated.Acoording to the calculation results,the distribution law of deformations and stresses of pier structure under design conditions are analyzed and the precompressed effect of prestressed cable is discussed.On this base,by taking the first stress of feature points as optimization variables,sensitivity analysis of design forces and layout scheme of prestressed cable is studied;and a better scheme is obtained.Research results are used by the design detail drawings of Xiaowan arch dam.
引文
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[6]张平,闫建文,李宁,等.溢洪道闸墩裂缝危害性及处理措施分析[J].岩石力学与工程学报,2003,22(1):81-85.
[7]李守巨,刘迎曦,范永思,等.混凝土大坝闸墩开裂机理及其加固措施[J].水利学报,2004,(3):93-97.
[2]常红星.某水电站泄洪闸预应力闸墩的三维有限元分析[J].山西建筑,2007,33(29):81-82.
[3]孙乃波,傅少君,陈胜宏.碗米坡预应力闸墩三维有限元分析[J].水电能源科学,2005,23(3):74-76.
[4]周建新,谢德浚,黄云生.岩滩水电站预应力闸墩结构设计[C]//现代水工预应力技术分专业委员会.水工预应力锚固技术论文集.北京:地震出版社,1997:35-40.
[5]余挺.铜街子水电站溢流坝闸墩预应力支承结构设计与预应力变位分析[J].四川水力发电,1990,(1):25-31.
[6]张平,闫建文,李宁,等.溢洪道闸墩裂缝危害性及处理措施分析[J].岩石力学与工程学报,2003,22(1):81-85.
[7]李守巨,刘迎曦,范永思,等.混凝土大坝闸墩开裂机理及其加固措施[J].水利学报,2004,(3):93-97.
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