强风下输电塔-线体系连续性失效反演研究
张国强 , 李治 , 董优 , 李丹煜 , 贺春 , 刘俊才 , 张钰 , 杨汶鑫
建筑钢结构进展 ›› 2026, Vol. 28 ›› Issue (01) : 128 -138.
强风下输电塔-线体系连续性失效反演研究
Investigation on Progressive Failure of Transmission Tower-Line System Under Strong Winds
输电线路作为典型的风敏感结构,不仅分布范围广且极易遭受强风影响,强风作用易引发输电线路受损甚至发生倒塌事故,进而造成严重的经济损失。文中以强风致某输电塔倒塌实际案例为依托,首先建立了输电塔-线体系有限元模型;在风荷载模拟过程中,充分考虑脉动风速的随机性与空间相干性影响,进而生成了不同风速与风攻角下风荷载时程曲线。其次基于非线性动力分析方法,对输电塔进行了强风下输电塔-线体系振动响应分析,明确了输电塔位移、节间位移角及关键杆件的应力响应规律,并捕捉了输电塔的连续性失效过程。结果表明:受塔-线耦合效应的影响,脉动风速随机性对输电塔的影响随着风攻角的增大而逐渐降低;当风速为28 m∙s-1、风攻角为0°作用时,该输电塔第2、3节间的风振响应相对较大,表明这两个节间为该输电塔的薄弱位置;此外,数值模拟得到的输电塔失效模式与实际失效模式基本相同,输电塔薄弱区间的部分杆件屈曲引发局部区域应力重分布,当更多杆件的应力超过屈服强度后,最终诱发输电塔发生连续性倒塌,本研究以期为强风下输电线路的安全运行提供参考。
Power transmission line is a typical wind-sensitive structure, which is widely distributed and very susceptible to strong winds, which results in damage or even collapse accidents, causing serious economic losses. Based on an actual collapse case of a transmission tower caused by strong wind, this paper firstly establishes a finite element model of the transmission tower-line system and simulates the wind load time histories for different wind speeds and wind attack angles with consideration of the randomness and the spatial coherence. Based on the nonlinear dynamic analysis method, the wind-induced response analyses of the transmission tower-line system under strong winds are carried out in terms of displacement and inter-segment displacement ratio (ISDR), as well as the stress responses of key steel members. The progressive failure process of the transmission tower-line system is subsequently numerically captured. The results show that, due to the tower-line coupling effect, the influence of wind speed randomness decreases gradually with the increase of the wind attack angle. The wind vibration responses of Segments 2 and 3 are relatively larger when the wind speed is 28 m·s-1 and the wind attack angle is 0°, indicating that these two segments are the weak positions of the tower. In addition, the failure mode of the tower obtained from the numerical simulation is basically the same as that of the actual tower. The buckling of some members leads to stress redistribution in the local area, and more failed members trigger the progressive collapse of the transmission towers. This study is intended to provide an available guide for the safe operation of transmission lines under strong winds.
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