大跨越输电塔线体系风振响应的时域分析

以规划中的世界第一高塔-舟山大跨越输电塔为工程背景,建立了塔线耦合体系的空间有限元模型,对体系的风振响应进行了时域分析,同时对输电塔线体系进行了气动弹性模型的风洞试验。通过理论计算和试验研究,将输电塔的响应分解为共振分量与背景分量,并分别考虑了输电线对这两部分分量的影响。针对背景与共振响应各自的特征,进一步提出了塔线体系的简化计算方法:背景分量的计算可以应用准静态假定,采用方差分析法得出;将塔线体系等效为悬吊摆系统,从而简化了共振分量的计算。上述两部分计算结果相叠加,即可得到塔线体系真实的风振响应。

Time-domain analysis on wind-induced dynamic response of long span power transmission line systems

The tallest transmission tower in the world,a part of the Zhoushan long span transmission line system,is studied and a spatial finite element model of the tower-line coupled system is established.The wind-induced dynamic response in time-domain is analyzed,also the wind tunnel experiment on an aeroelastic model is conducted.Based on both the theoretical analysis and experimental study,the system response can be divided into background response and resonant response,and the influence of the transmission line is considered in the analysis.A simplified method for calculating the dynamic response is proposed according to the different features of the two types of responses;the background response can be calculated with the covariance analysis based on the quasi-static assumption,and the resonant response can be calculated more easily after simplifying the transmission line system into a suspended mass pendulum system.Superposition of the two types of responses is the actual wind-induced dynamic response of the tower-line system.