窄基输电铁塔风振系数取值探讨

Study on Wind Coefficient of Narrow Base Transmission Tower

为研究高度与根开之比大于6的窄基角钢塔风振系数的计算方法,以昆北换流站接地极线路工程鸡街极址附近一直线塔为研究对象。基于谐波叠加法模拟风荷载时程,在ANSYS中建立输电塔有限元模型,进行输电塔风振响应时程分析,由加速度响应计算风振系数。经分析可得出结论:DL/T 5154—2012《架空输电线路杆塔结构设计技术规定》的取值不适用于该铁塔。

In order to study the calculation method of wind-induced vibration coefficient of narrow-base angle steel transmission tower with the ratio of height to root opening greater than 6,taking a tangent tower neighbouring Jijie grounding electrode of Kunbei converter station grounding electrode line project as the research object.Wind load history based on harmonic superposition method was simulated,then the finite element model was built in ANSYS to execute the wind-induced vibration response time-history analysis of transmission tower and the wind-induced vibration coefficient was calculated by acceleration response.Through analyzing,we can conclude that the value in Technical Code for the Design of Tower and Pole Structures of Overhead Transmission Line(DL/T 5154—2012)is not applicable to this tower.