门字型输电塔风振响应分析及风振系数的确定
|
摘要
门字型塔是一种综合性能比较好的钻越塔,风荷载对这种高柔结构的影响很大,但实际设计中风振系数按规范统一取值不是很合理,且取值较大,偏于保守。故本文针对门字型输电塔在脉动风作用下的响应、风振系数的求法及合理取值进行专门研究。主要建立了门字型塔ANSYS有限元模型,进行了模态分析;以Davenport风速谱为脉动风功率自谱,应用AR法编制程序顺风模拟了风荷载时程曲线,将由模拟风计算出的风载加载至门字型塔各塔段上对其进行动力时程分析,计算了风振系数并与高耸结构设计规范值进行了比较。研究结果表明:在风载作用下,塔身和横担均会产生较为明显的动力响应;塔身、横担风振系数可取均值,分别为1.39、1.59;规范计算得到的风振系数和本文时程分析得到的风振系数变化规律基本接近,但规范取值较大。
The door-type tower is a kind of tower with better comprehensive performance. The impact of wind load on the high soft structure is very big, but during the actual design the vibration coefficient according to the code is not very reasonable. The value is bigger and conservative, so the dynamic properties of door-type towers are systematically investigated in this paper, including the response under the action of pulsating wind, the method of the wind vibration coefficient and its reasonable value range. A finite element model of the door-type tower is established using ANYSYS software, based on which the modal analysis is carried out. After imposing Davenport wind speed spectrum as the pulsating wind power self-spectrum, the time history curve of wind load is simulated using AR method. The wind load calculated above is then loaded on each section of the tower, and the corresponding dynamic time history analysis is finished. Finally, the wind vibration coefficient is obtained and compared with the one obtained by the code. It reveals that the wind load has a great influence on the dynamic responses of the tower body and the cross arm, and their average wind vibration coefficients are 1.39 and 1.59, respectively. The wind vibration coefficients calculated in present paper, as well as their variation tendencies, are consistent with that obtained by the code, while the latter value is bigger.
The door-type tower is a kind of tower with better comprehensive performance. The impact of wind load on the high soft structure is very big, but during the actual design the vibration coefficient according to the code is not very reasonable. The value is bigger and conservative, so the dynamic properties of door-type towers are systematically investigated in this paper, including the response under the action of pulsating wind, the method of the wind vibration coefficient and its reasonable value range. A finite element model of the door-type tower is established using ANYSYS software, based on which the modal analysis is carried out. After imposing Davenport wind speed spectrum as the pulsating wind power self-spectrum, the time history curve of wind load is simulated using AR method. The wind load calculated above is then loaded on each section of the tower, and the corresponding dynamic time history analysis is finished. Finally, the wind vibration coefficient is obtained and compared with the one obtained by the code. It reveals that the wind load has a great influence on the dynamic responses of the tower body and the cross arm, and their average wind vibration coefficients are 1.39 and 1.59, respectively. The wind vibration coefficients calculated in present paper, as well as their variation tendencies, are consistent with that obtained by the code, while the latter value is bigger.
引文
[1]西安交通大学.750kV输电线路钻越塔型式选择及设计研究结题报告[R].兰州:兰州电力设计院,2017.(Xi’an Jiaotong University.The research conclusion report on the study of the drilling tower type selection and design in 750kV transmission line[R].Lanzhou:Lanzhou Electric Power Design Institute,2017(in Chinese)).
[2]吴新桥,彭康,耿力,等.台风下输电塔风振响应有限元分析及测试试验[J].应用力学学报,2018,35(2):328-332.(WU Xinqiao,PENG Kang,GENG Li,et al.Real-time online monitoring and evaluation of wind-induced vibration response of transmission tower in typhoon environment[J].Chinese journal of applied mechanics,2018,35(2):328-332(in Chinese)).
[3]中华人民共和国行业标准编写组.架空输电线路杆塔结构设计技术规定:DL/T5154-2012[S].北京:中国计划出版社,2012.(The Professional Standards Compilation Group of People’s Republic of China.Code for design of the tower structure in overhead transmission line:DL/T5154-2012[S].Beijing:China Planning Press,2012(in Chinese)).
[4]邓洪洲,吴昀,刘万群,等.大跨越输电塔结构风振系数研究[J].特种结构,2006,23(3):66-69.(DENG Hongzhou,WU Yun,LIUWanqun,et al.Research on wind-induced vibration coefficient of long span transmission towers[J].Special structures,2006,23(3):66-69(in Chinese)).
[5]刘万群.大跨越输电塔线体系风振响应研究[D].上海:同济大学,2006.(LIU Wanqun.Wind-induced response of long span transmission line system[D].Shanghai:Tongji University,2006(in Chinese)).
[6]徐福英,许可芳,雒晓兵.基于ANSYS的铁塔结构振动分析[J].科技咨询,2013,31:98-99.(XU Fuying,XU Kefang,LUO Xiaobing.Vibration analysis of tower structure based on ANSYS[J].Science&technology information,2013,31:98-99(in Chinese)).
[7]中华人民共和国行业标准编写组.高耸结构设计规范:GB50135-2006[S].北京:中国计划出版社,2006.(The Professional Standards Compilation Group of People’s Republic of China.Code for tall structure design:GB50135-2006[S].Beijing:China Planning Press,2006(in Chinese)).
[8]张文福,马昌恒,肖岩.风场模拟中AR模型的若干问题[J].计算力学学报,2009,26(1):124-130.(ZHANG Wenfu,MAChangheng,XIAO Yan.Some issues on AR models for wind field simulation[J].Chinese journal of computational mechanics,2009,26(1):124-130(in Chinese)).
[9]秦力,袁俊健,李兴元.基于AR法的输电塔线体系风速时程模拟[J].水电能源科学,2011,29(2):169-171.(QIN Li,YUANJunjian,LI Xingyuan.Wind speed time-history simulation for transmission line system based on AR method[J].Water resources and power,2011,29(2):169-171(in Chinese)).
[10]汪楚清,孙清,王虎长,等.拉线塔风振系数取值研究[J].钢结构,2016,31(5):31-36.(WANG Chuqing,SUN Qing,WANGHuchang,et al.Research on the wind vibration coefficient of guyed steel tower[J].Steel construction,2016,31(5):31-36(in Chinese)).
[11]赵芳瀷,张伟政,季国剑,等.特高压输电线路V型绝缘子串动力学特性数值研究[J].应用力学学报,2016,33(4):602-607.(ZHAOFangyi,ZHANG Weizheng,JI Guojian,et al.Numerical investigations of dynamic characteristics of V-insulator strings in UHV transmission lines by FEM[J].Chinese journal of applied mechanics,2016,33(4):602-607(in Chinese)).
[12]DEODATIS G.Simulation of ergodic multivariate stochastic processes[J].Journal of engineering mechanics,1996,122(8):778-787.
[13]谢华平,张回,陈俊,等.输电塔脉动风荷载功率谱模型及时程模拟[J].湘潭大学自然科学学报,2011,33(3):70-76.(XIEHuaping,ZHANG Hui,CHEN Jun,et al.Power spectrum model and time-history simulation of fluctuating wind loading acting on transmission tower[J].Natural science journal of Xiangtan university,2011,33(3):70-76(in Chinese)).
[2]吴新桥,彭康,耿力,等.台风下输电塔风振响应有限元分析及测试试验[J].应用力学学报,2018,35(2):328-332.(WU Xinqiao,PENG Kang,GENG Li,et al.Real-time online monitoring and evaluation of wind-induced vibration response of transmission tower in typhoon environment[J].Chinese journal of applied mechanics,2018,35(2):328-332(in Chinese)).
[3]中华人民共和国行业标准编写组.架空输电线路杆塔结构设计技术规定:DL/T5154-2012[S].北京:中国计划出版社,2012.(The Professional Standards Compilation Group of People’s Republic of China.Code for design of the tower structure in overhead transmission line:DL/T5154-2012[S].Beijing:China Planning Press,2012(in Chinese)).
[4]邓洪洲,吴昀,刘万群,等.大跨越输电塔结构风振系数研究[J].特种结构,2006,23(3):66-69.(DENG Hongzhou,WU Yun,LIUWanqun,et al.Research on wind-induced vibration coefficient of long span transmission towers[J].Special structures,2006,23(3):66-69(in Chinese)).
[5]刘万群.大跨越输电塔线体系风振响应研究[D].上海:同济大学,2006.(LIU Wanqun.Wind-induced response of long span transmission line system[D].Shanghai:Tongji University,2006(in Chinese)).
[6]徐福英,许可芳,雒晓兵.基于ANSYS的铁塔结构振动分析[J].科技咨询,2013,31:98-99.(XU Fuying,XU Kefang,LUO Xiaobing.Vibration analysis of tower structure based on ANSYS[J].Science&technology information,2013,31:98-99(in Chinese)).
[7]中华人民共和国行业标准编写组.高耸结构设计规范:GB50135-2006[S].北京:中国计划出版社,2006.(The Professional Standards Compilation Group of People’s Republic of China.Code for tall structure design:GB50135-2006[S].Beijing:China Planning Press,2006(in Chinese)).
[8]张文福,马昌恒,肖岩.风场模拟中AR模型的若干问题[J].计算力学学报,2009,26(1):124-130.(ZHANG Wenfu,MAChangheng,XIAO Yan.Some issues on AR models for wind field simulation[J].Chinese journal of computational mechanics,2009,26(1):124-130(in Chinese)).
[9]秦力,袁俊健,李兴元.基于AR法的输电塔线体系风速时程模拟[J].水电能源科学,2011,29(2):169-171.(QIN Li,YUANJunjian,LI Xingyuan.Wind speed time-history simulation for transmission line system based on AR method[J].Water resources and power,2011,29(2):169-171(in Chinese)).
[10]汪楚清,孙清,王虎长,等.拉线塔风振系数取值研究[J].钢结构,2016,31(5):31-36.(WANG Chuqing,SUN Qing,WANGHuchang,et al.Research on the wind vibration coefficient of guyed steel tower[J].Steel construction,2016,31(5):31-36(in Chinese)).
[11]赵芳瀷,张伟政,季国剑,等.特高压输电线路V型绝缘子串动力学特性数值研究[J].应用力学学报,2016,33(4):602-607.(ZHAOFangyi,ZHANG Weizheng,JI Guojian,et al.Numerical investigations of dynamic characteristics of V-insulator strings in UHV transmission lines by FEM[J].Chinese journal of applied mechanics,2016,33(4):602-607(in Chinese)).
[12]DEODATIS G.Simulation of ergodic multivariate stochastic processes[J].Journal of engineering mechanics,1996,122(8):778-787.
[13]谢华平,张回,陈俊,等.输电塔脉动风荷载功率谱模型及时程模拟[J].湘潭大学自然科学学报,2011,33(3):70-76.(XIEHuaping,ZHANG Hui,CHEN Jun,et al.Power spectrum model and time-history simulation of fluctuating wind loading acting on transmission tower[J].Natural science journal of Xiangtan university,2011,33(3):70-76(in Chinese)).