台风“韦帕”风场实测及风致输电塔振动响应
|
摘要
给出了台风"韦帕"经过时,在典型的农村地貌上进行的多点边界层风特性以及风致输电塔振动的实测结果。基于风速数据,重点分析了风特性各项参数的空间均匀性,包括平均风速和风向、风剖面参数、湍流强度、阵风因子、湍流积分尺度和脉动风谱、竖向衰减系数以及水平相干性。采集了输电塔横担和塔头塔身连接处垂直线路方向的振动加速度。基于振动数据,应用Hilbert-Huang变换(HHT)方法识别了输电塔垂直线路方向第1、2阶模态的自振频率和阻尼比。结果表明,自振频率识别结果与有限元计算结果比较接近,阻尼比识别结果远大于一般钢结构的阻尼比。
The multi-points field measurement results of boundary layer wind characteristics over typical country terrain and wind-induced response of transmission tower during the passage of typhoon Wipha were presented.Detailed analyses of the wind speed were conducted to investigate the spatial homogeneousness of wind field during windstorms.The measured wind data were analyzed to compare the information on mean wind speed and wind direction,wind profile parameters,turbulence intensity,gust factor,turbulence integral length scale and spectra of fluctuating wind,vertical decay factor and horizontal coherence.Besides the wind speed,lateral wind-induced acceleration responses at the middle and the top of the 43-meters high transmission tower were measured.Based on the field measurements,the natural vibration frequencies and damping ratios of the first two lateral vibration modes were identified by Hilbert-Huang transform(HHT).The results show that identified results of natural vibration frequencies are well matched with those of finite element method calculation,and identified results of damping ratios are more greater than that those of general steel structures.
The multi-points field measurement results of boundary layer wind characteristics over typical country terrain and wind-induced response of transmission tower during the passage of typhoon Wipha were presented.Detailed analyses of the wind speed were conducted to investigate the spatial homogeneousness of wind field during windstorms.The measured wind data were analyzed to compare the information on mean wind speed and wind direction,wind profile parameters,turbulence intensity,gust factor,turbulence integral length scale and spectra of fluctuating wind,vertical decay factor and horizontal coherence.Besides the wind speed,lateral wind-induced acceleration responses at the middle and the top of the 43-meters high transmission tower were measured.Based on the field measurements,the natural vibration frequencies and damping ratios of the first two lateral vibration modes were identified by Hilbert-Huang transform(HHT).The results show that identified results of natural vibration frequencies are well matched with those of finite element method calculation,and identified results of damping ratios are more greater than that those of general steel structures.
引文
[1]谢强,张勇,李杰.华东电网500kV任上5237线飑线风致倒塔事故调查分析[J].电网技术,2006,30(10):59-63.XIE Qiang,ZHANG Yong,LI Jie.Investigation onTower Collapses of 500 kV Renshang 5237 Transmis-sion Line Caused by Downburst[J].Power SystemTechnology,2006,30(10):59-63.
[2]谢强,李杰.电力系统自然灾害的现状与对策[J].自然灾害学报,2006,15(4):126-131.XIE Qiang,LI Jie.Current Situation of Natural Disas-ter in Electric Power System and Countermeasures[J].Journal of Natural Disasters,2006,15(4):126-131.
[3]FU J Y,LI Q S,WU J R,et al.Field Measurements ofBoundary Layer Wind Characteristics and Wind-in-duced Responses of Super-tall Buildings[J].Journal ofWind Engineering and Industrial Aerodynamics,2008,96(8/9):1332-1358.
[4]MEHTA K C,KADABA R.Field Data Analysis ofElectrical Conductor Response to Winds[J].Journal ofWind Engineering and Industrial Aerodynamics,1990,36(1/3):329-338.
[5]DYRBYE C,HANSEN S O.Wind Loads on Structures[M].New York:John Wiley&Sons,1997.
[6]CHEN J,XU Y L,ZHANG R C.Modal ParameterIdentification of Tsing Ma Suspension Bridge UnderTyphoon Victor:EMD-HT Method[J].Journal ofWind Engineering and Industrial Aerodynamics,2004,92(10):805-827.
[7]陈隽,徐幼麟,李杰.Hilbert-Huang变换在密频结构阻尼识别中的应用[J].地震工程与工程振动,2003,23(4):34-42.CHEN Jun,XU You-lin,LI Jie.Hilbert-Huang Trans-form for Damping Ratio Identification of Structureswith Closely Spaced Modes of Vibration[J].Earth-quake Engineering and Engineering Vibration,2003,23(4):34-42.
[8]张琳琳,谢强,李杰.输电线路多塔耦联体系的风致动力响应分析[J].防灾减灾工程学报,2006,26(3):261-267.ZHANG Lin-lin,XIE Qiang,LI Jie.Dynamic Wind-in-duced Response Analysis of Multi-tower-line CoupledSystem of Transmission Line[J].Journal of DisasterPrevention and Mitigation Engineering,2006,26(3):261-267.
[2]谢强,李杰.电力系统自然灾害的现状与对策[J].自然灾害学报,2006,15(4):126-131.XIE Qiang,LI Jie.Current Situation of Natural Disas-ter in Electric Power System and Countermeasures[J].Journal of Natural Disasters,2006,15(4):126-131.
[3]FU J Y,LI Q S,WU J R,et al.Field Measurements ofBoundary Layer Wind Characteristics and Wind-in-duced Responses of Super-tall Buildings[J].Journal ofWind Engineering and Industrial Aerodynamics,2008,96(8/9):1332-1358.
[4]MEHTA K C,KADABA R.Field Data Analysis ofElectrical Conductor Response to Winds[J].Journal ofWind Engineering and Industrial Aerodynamics,1990,36(1/3):329-338.
[5]DYRBYE C,HANSEN S O.Wind Loads on Structures[M].New York:John Wiley&Sons,1997.
[6]CHEN J,XU Y L,ZHANG R C.Modal ParameterIdentification of Tsing Ma Suspension Bridge UnderTyphoon Victor:EMD-HT Method[J].Journal ofWind Engineering and Industrial Aerodynamics,2004,92(10):805-827.
[7]陈隽,徐幼麟,李杰.Hilbert-Huang变换在密频结构阻尼识别中的应用[J].地震工程与工程振动,2003,23(4):34-42.CHEN Jun,XU You-lin,LI Jie.Hilbert-Huang Trans-form for Damping Ratio Identification of Structureswith Closely Spaced Modes of Vibration[J].Earth-quake Engineering and Engineering Vibration,2003,23(4):34-42.
[8]张琳琳,谢强,李杰.输电线路多塔耦联体系的风致动力响应分析[J].防灾减灾工程学报,2006,26(3):261-267.ZHANG Lin-lin,XIE Qiang,LI Jie.Dynamic Wind-in-duced Response Analysis of Multi-tower-line CoupledSystem of Transmission Line[J].Journal of DisasterPrevention and Mitigation Engineering,2006,26(3):261-267.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心