摘要
强风作用下往往产生大变形的非线性动力抖振响应,是导致电力网络风偏闪络和支撑杆塔风灾破坏的主要原因。为了揭示强风作用下输电线路风效应形成机理,以典型两跨输电线‐绝缘子为研究对象,以绝缘子的风偏位移和杆塔对绝缘子端部的空间支座反力响应为考察重点,基于索结构力学,给出了静力平均风偏状态的非线性解,并考察了体系在风偏状态下模态、气动阻尼等动力特性的变化;推导了响应的影响线函数及模态参与系数表达式,提出了线性时域动力响应的计算方法;进而依据风工程理论,给出了脉动风振响应背景分量和共振分量的频域表达式;采用典型算例,通过与非线性有限元模型结果进行分析比较。结论表明,提出的三维振动时/频域理论模型及参数计算取值方法具备足够的工程效率和精度。研究为揭示输电线路风灾的破坏机理,完善输电线路结构的抗风设计提供了重要的理论基础和计算方法。
The nonlinear dynamic buffeting response with large deformation often occurs under the action of strong wind,which will always lead to wind flashover of power network and the wind damage of supporting towers.In order to reveal the formation mechanism of wind effect on transmission lines under the action of strong wind,this paper takes the typical two-span transmission lines-insulators as the research object,and studies on the wind deflection displacement of insulators and the reaction response of towers to the spatial supports at the end of insulators.Based on the cable structure mechanics,the nonlinear solution of the static average wind deviation state is analyzed,and the changes of dynamic characteristics such as mode and aerodynamic damping of the system under wind deviation are investigated.The expressions of the influence line function and modal participation coefficient of the response are derived,and the calculation method of linear dynamic response in time domain is proposed.According to the theo‐ry of wind engineering,the frequency domain expressions of background component and resonance component of fluctuating wind vibration response are given.A typical example is used to analyze and compare with the results of nonlinear finite element model.The results show that the three-dimensional vibration time/frequency domain theoretical model and the parameter calculation meth‐od proposed in this paper have sufficient engineering efficiency and accuracy.The study provides a theoretical basis and calculation method for revealing the damage mechanism of transmission line wind disaster and improving the wind-resistant design of transmis‐sion line structure.
作者
汪大海
王涛
汪伟
徐康
梁枢果
WANG Da-hai;WANG Tao;WANG Wei;XU Kang;LIANG Shu-guo(Department of Architectural Engineering,School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Guangdong Electric Power Design Institute,Guangzhou 510799,China;State Grid Electric Power Research Institute Wuhan Nari Group Corporation,Wuhan 430072,China;School of Civil Engineering,Wuhan University,Wuhan 430070,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2022年第5期1109-1117,共9页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(51478373,51878527)。
关键词
非线性
抖振响应
输电线
背景分量
共振分量
nonlinear
buffeting response
transmission line
background component
resonant component
