输电铁塔强风荷载模型及设计规范比较研究

为研究输电铁塔在强风荷载和设计风速作用下响应的区别,以某110k V线路直线型铁塔为研究对象,用ANSYS软件建立输电塔有限元数值模型。模拟龙卷风和常规风的风场结构。按照设计规范规定的风荷载计算公式,将风速场转化为风荷载并施加到输电塔有限元模型上,计算结构响应。计算在60°风向角时,EF1、EF2级龙卷风和与设计风速大小相同的常规风作用下输电塔结构的静力响应。通过比较可以看出,按照规范中的设计风速(26.5m/s)进行输电塔设计有一定合理性,但不能满足EF2级及以上级别龙卷风的抗风要求;应提高设计风速大小以满足输电铁塔稳定性要求。

In order to study the difference of transmission tower response under strong wind load and design wind speed,a110 k V straight iron tower is taken as the research object.The finite element numerical model of the transmission tower is established by the ANSYS software and the wind field structure of tornadoes and conventional winds is simulated.According to the calculation formula of wind load specified in the design code,the wind speed field is transformed into wind load and applied to the finite element model of the transmission tower to calculate structural response.The static response of the transmission tower structure under the action of EF1 and EF2 tornadoes and the conventional wind with the same design wind speed at 60°wind direction angle are calculated.By comparison,it is reasonable to design the transmission tower according to the design wind speed(26.5 m/s)in the code,but it cannot meet the wind resistance requirements of EF2 and above tornadoes.The design wind speed should be increased to meet the requirement of transmission tower stability.