考虑损伤的输电塔下击暴流作用下的结构安全评定模型
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摘要
输电塔为高耸结构,具有柔度大、阻尼小的特点,对风载荷非常敏感,易发生振动疲劳损伤和极端条件下的倒塌破坏。因输电塔在下击暴流作用下的倒塌事故近年来屡见不鲜,故对在役输电塔结构进行下击暴流作用下的安全评定显得非常重要。根据已有的资料归纳出下击暴流的风暴特征,并从风工程的角度确定了下击暴流的风载荷值。为了模拟输电塔在役状态,分别对其可能出现的螺栓脱落、拉杆塑性疲劳断裂、压杆失稳3种损伤进行了ANSYS有限元分析,进而得出考虑损伤的输电塔有限元模型,为输电塔安全性研究提供参考。
The high-rise structure of power transmission tower is fairly sensitive to wind load and has the characteristics of large flexibility and small damp,and is easy to have vibration fatigue and collapse. In recent years,the collapses of power transmission towers under the action of downburst are very common. So,it is important to assess the safety of the existing power transmission towers under downbursts. In this article,the wind load of downburst was decided according to it's storm character-istics and the theory of wind engineering. To simulate the working transmission towers,the falling of some bolts,instability and fracture of some members were considered by ANSYS. Then,the model of transmission considering fatigue for safety assessment was built.
The high-rise structure of power transmission tower is fairly sensitive to wind load and has the characteristics of large flexibility and small damp,and is easy to have vibration fatigue and collapse. In recent years,the collapses of power transmission towers under the action of downburst are very common. So,it is important to assess the safety of the existing power transmission towers under downbursts. In this article,the wind load of downburst was decided according to it's storm character-istics and the theory of wind engineering. To simulate the working transmission towers,the falling of some bolts,instability and fracture of some members were considered by ANSYS. Then,the model of transmission considering fatigue for safety assessment was built.
引文
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[2]Proctor F H.Numerical Simulations of an Isolated Microburst.Part:Dynamics and Structure[J].Journal of the Atmospheric Sciences,1988,45(21):3137-3160.
[3]张勇.输电线路风灾防御的现状与对策[J].华东电力,2006,34(3):28-31.
[4]Chen L,Letchford C W.Multi-scale correlation analyses of two lateral profiles of full-scale downburst speeds[J].Wind Eng Ind Aerodyn,2006,94(9):675-696.
[5]Dempsey D,White H.Winds wreak havoc on lines[J].Tracsmission and Distribution World,1996,48(6):32-37.
[6]李黎,尹鹏,王开明,等.不同风向角动风下大跨越输电塔风振响应分析[J].武汉理工大学学报,2009,31(23):68-71.
[7]秦文科.钢管输电塔法兰联结节点螺栓脱落损伤诊断的研究[D].武汉:武汉理工大学,2008.
[8]GB/T3098.1,紧固件机械性能:螺栓、螺母和螺柱[S].
[9]楼志文.损伤力学基础[M].西安:西安交通大学出版社,1991.
[10]余天庆,钱济成.损伤理论及其应用[M].北京:国防工业出版社,1993.
[11]查小鹏.高耸结构风致疲劳安全预警的理论和方法[D].武汉:武汉理工大学,2008.
[12]瞿伟廉,吉柏锋,李健群,等.下击暴流风的数值仿真研究[J].地震工程与工程振动,2008,28(5):133-139.
[13]Holmes J D,Oliver S E.An empiricalmodel of a downburst[J].Engineering Structures,2000,22(9):1167-1172.
[14]Wood G S,Kwok K C S,Motteram N A,et al.Physical andnumericalmodelling of thunderstorm downdraft[J].Journalof W ind Engineering and Industrial Aerodynamics,2001,89(6):535-552.
[15]Kim Jongdae,Hangan Horia.Numerical simulations of impinging jets with application to downbursts[J].Journal of Wind Engineering and Industrial Aerodynamics,2007,95(4):279-298.
[16]彭志伟,陈勇,孙柄楠,等.三维雷暴冲击风风场数值模拟[C]//第十四届全国工程设计计算机应用学术会议.杭州:[s.n.],2008.
[17]DL/T 5092—1999P,110~500 k V架空送电线路设计技术规程[S].
[18]GB50135—2006,高耸结构设计规范[S].
[19]DL/T 5310—2001,架空送电线路钢管杆设计技术规定[S].
[20]孙登坤.考虑损伤的输电塔整体结构安全评定[D].武汉:武汉理工大学,2011.
[21]孙登坤,蒋华,唐雅婷.下击暴流作用下输电塔整体结构安全评定[EB/OL].[2011-04-27].http://www.paper.edu.cn/releasepaper/content/201104-722.
[2]Proctor F H.Numerical Simulations of an Isolated Microburst.Part:Dynamics and Structure[J].Journal of the Atmospheric Sciences,1988,45(21):3137-3160.
[3]张勇.输电线路风灾防御的现状与对策[J].华东电力,2006,34(3):28-31.
[4]Chen L,Letchford C W.Multi-scale correlation analyses of two lateral profiles of full-scale downburst speeds[J].Wind Eng Ind Aerodyn,2006,94(9):675-696.
[5]Dempsey D,White H.Winds wreak havoc on lines[J].Tracsmission and Distribution World,1996,48(6):32-37.
[6]李黎,尹鹏,王开明,等.不同风向角动风下大跨越输电塔风振响应分析[J].武汉理工大学学报,2009,31(23):68-71.
[7]秦文科.钢管输电塔法兰联结节点螺栓脱落损伤诊断的研究[D].武汉:武汉理工大学,2008.
[8]GB/T3098.1,紧固件机械性能:螺栓、螺母和螺柱[S].
[9]楼志文.损伤力学基础[M].西安:西安交通大学出版社,1991.
[10]余天庆,钱济成.损伤理论及其应用[M].北京:国防工业出版社,1993.
[11]查小鹏.高耸结构风致疲劳安全预警的理论和方法[D].武汉:武汉理工大学,2008.
[12]瞿伟廉,吉柏锋,李健群,等.下击暴流风的数值仿真研究[J].地震工程与工程振动,2008,28(5):133-139.
[13]Holmes J D,Oliver S E.An empiricalmodel of a downburst[J].Engineering Structures,2000,22(9):1167-1172.
[14]Wood G S,Kwok K C S,Motteram N A,et al.Physical andnumericalmodelling of thunderstorm downdraft[J].Journalof W ind Engineering and Industrial Aerodynamics,2001,89(6):535-552.
[15]Kim Jongdae,Hangan Horia.Numerical simulations of impinging jets with application to downbursts[J].Journal of Wind Engineering and Industrial Aerodynamics,2007,95(4):279-298.
[16]彭志伟,陈勇,孙柄楠,等.三维雷暴冲击风风场数值模拟[C]//第十四届全国工程设计计算机应用学术会议.杭州:[s.n.],2008.
[17]DL/T 5092—1999P,110~500 k V架空送电线路设计技术规程[S].
[18]GB50135—2006,高耸结构设计规范[S].
[19]DL/T 5310—2001,架空送电线路钢管杆设计技术规定[S].
[20]孙登坤.考虑损伤的输电塔整体结构安全评定[D].武汉:武汉理工大学,2011.
[21]孙登坤,蒋华,唐雅婷.下击暴流作用下输电塔整体结构安全评定[EB/OL].[2011-04-27].http://www.paper.edu.cn/releasepaper/content/201104-722.
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