大跨度弧形闸门静动力学数值分析
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摘要
针对大跨度弧形闸门结构受力复杂且易发生弯曲变形和振动问题,采用有限元软件ANSYS对弧形闸门进行分析计算,对闸门主要部件的应力状态及变形情况进行了校核,分析了闸门自振频率的影响因素,全面评估了闸门的安全性能。并以目前国内跨度最大的某弧形闸门为研究对象,对不同工况下闸门的刚度和强度进行了计算,考虑流体与闸门之间的流固耦合作用,利用附加水体法分析了水体对闸门自振频率的影响,同时还研究了不同开度闸门自振频率变化情况。结果表明,弧形闸门总体强度和刚度满足设计要求,主要部件存在局部应力集中;水体作用使闸门的自振频率有一定程度的减小;随开度的增加,闸门的振动频率有不同程度的增加。
Aiming at the problem of the vibration and the complexity of structure stress,the finite element software ANSYS is adopt to analyze the radial gate,and the stress and deformation of gate components are checked.And then the influencing factor of natural vibration frequency is analyzed.At the same time,the safety performance of the gate is evaluated.Taking the longest span radial gate in China as a research object,the rigidity and strength of the gate are calculated under different operating conditions.Considering the action of fluid-solid coupling,additional water method is used to analyze the influence of water body on the natural vibration frequency of the gate.Finally,the natural vibration frequency of the gate in different opening is researched.The results indicate that the rigidity and strength of the radial gate satisfies the design requirement;stress concentration exists in main gate components;with the influence of water body,the natural vibration frequency of the gate decreases in a certain degree;with the increase of opening,the vibration frequency of the gate increases in some extent.
Aiming at the problem of the vibration and the complexity of structure stress,the finite element software ANSYS is adopt to analyze the radial gate,and the stress and deformation of gate components are checked.And then the influencing factor of natural vibration frequency is analyzed.At the same time,the safety performance of the gate is evaluated.Taking the longest span radial gate in China as a research object,the rigidity and strength of the gate are calculated under different operating conditions.Considering the action of fluid-solid coupling,additional water method is used to analyze the influence of water body on the natural vibration frequency of the gate.Finally,the natural vibration frequency of the gate in different opening is researched.The results indicate that the rigidity and strength of the radial gate satisfies the design requirement;stress concentration exists in main gate components;with the influence of water body,the natural vibration frequency of the gate decreases in a certain degree;with the increase of opening,the vibration frequency of the gate increases in some extent.
引文
[1]夏念凌.水工闸门事故实例分析[M].北京:水利水电出版社,1994.
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[3]Thang N D,Naudascher E.Vortex-excited Vibra-tions of Underflow Gates[J].Journal of HydraulicResearch,1986,24(2):131-151.
[4]Westergard H M.Water Pressures on Dams duringEarthquakes[J].Transactions of the American Soci-ety of Civil Engineers,1993,98(2):418-433.
[5]严根华,陈发展,赵建平.表孔弧形闸门流激振动原型观测研究[J].水力发电学报,2006,25(4):45-50.
[6]胡友安,王苗苗,宋戈,等.蒙城弧形钢闸门的三维数值分析[J].水电能源科学,2011,29(1):112-115.
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[8]水利部、电力工业部东北勘测设计研究院,西北农业大学,安徽省水利水电勘测设计院.水利水电工程钢闸门设计规范(SL74-95)[S].北京:中国水利水电出版社,1995.
[9]水利部水工金属结构安全监测中心,水利部丹江口水利枢纽管理局.水利水电工程金属结构报废标准(SL226-98)[S].北京:中国水利水电出版社,1998.
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[11]郭永刚,赵晓飞,石革清.考虑流—固耦合影响的挡水结构自振特性[J].世界地震工程,2004,20(3):78-83.
[12]焦修明.弧形闸门动力特性及流激振动研究[D].武汉:武汉大学,2005.
[2]章继光,刘恭忍.轻型弧形钢闸门事故分析研究[J].水利发电学报,1992(3):49-57.
[3]Thang N D,Naudascher E.Vortex-excited Vibra-tions of Underflow Gates[J].Journal of HydraulicResearch,1986,24(2):131-151.
[4]Westergard H M.Water Pressures on Dams duringEarthquakes[J].Transactions of the American Soci-ety of Civil Engineers,1993,98(2):418-433.
[5]严根华,陈发展,赵建平.表孔弧形闸门流激振动原型观测研究[J].水力发电学报,2006,25(4):45-50.
[6]胡友安,王苗苗,宋戈,等.蒙城弧形钢闸门的三维数值分析[J].水电能源科学,2011,29(1):112-115.
[7]黄峻,谢智雄.大跨度弧形闸门静动力特性分析研究[J].甘肃水利水电技术,2012,48(8):33-34,45.
[8]水利部、电力工业部东北勘测设计研究院,西北农业大学,安徽省水利水电勘测设计院.水利水电工程钢闸门设计规范(SL74-95)[S].北京:中国水利水电出版社,1995.
[9]水利部水工金属结构安全监测中心,水利部丹江口水利枢纽管理局.水利水电工程金属结构报废标准(SL226-98)[S].北京:中国水利水电出版社,1998.
[10]兰文改,周娟,高东辉.平面钢闸门自振特性有限元分析[J].人民黄河,2009,31(8):112-113.
[11]郭永刚,赵晓飞,石革清.考虑流—固耦合影响的挡水结构自振特性[J].世界地震工程,2004,20(3):78-83.
[12]焦修明.弧形闸门动力特性及流激振动研究[D].武汉:武汉大学,2005.
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