档距对耐张输电塔抗风承载力影响研究

Effects of Span on Force-bearing Capacity of Wind-excited Tensioning Transmission Tower-line System

研究了档距对耐张输电塔抗风承载力的影响。采用非线性有限元方法建立了耐张塔线体系的计算模型,采用随机模拟方法建立了耐张输电线路的强风荷载模型和数值模拟方法,提出了耐张线路风振响应的计算方法。此外,建立了耐张塔节点精细化模型,研究了耐张塔主材杆件局部受力特点。以南方沿海地区某实际线路为工程背景,研究了档距对耐张塔抗风承载能力的影响特点。结果表明:相邻直线塔倒塌引起的拉扯力对耐张塔具有较大影响,随着档距的增加耐张塔的风致响应显著增加。

The effects of span on force-bearing capacity of wind-excited tensioning transmission tower-line system was actively investigated in this study.The analytical model of tensioning transmission tower-line system were established based on nonlinear finite element(FE)method.The model and simulating approach for typhoon loads were developed by using stochastic simulation method.In addition,a fine FE model of tower joint was constructed to investigate the local force-bearing capacity.A real tensioning transmission tower-line system constructed in southern China was taken as an example to examine the structural force-bearing capacity under typhoon winds.The made observations indicate that the collapse of adjacent tower may induce large tensile force and has significant effects on the tensioning transmission tower.The wind-induced dynamic responses of the tensioning transmission tower will increase with increasing span.