输电杆塔风荷载风振系数的数值计算与规范比较

Numerical calculation and specifications comparison of wind-induced vibration coefficient for wind load of transmission tower

在水平风荷载作用下,以工程实际输电塔为研究对象,基于准定常气动力假设,通过非线性有限元数值模拟的动力时程计算,着重考察了不同类型杆塔在不同高度和不同风速下风荷载的风振系数。对国际典型规范的风振系数公式取值进行比较和解析,并通过数值计算结果进行校核分析。研究为我国输电塔结构抗风设计规范的合理修订提供一些客观的参考和借鉴。

Under the action of horizontal wind loads,the actual transmission tower of the project was taken as the research object. Based on the quasi-steady assumption,the wind-induced vibration coefficients of different types of towers under wind loads at different heights and wind speeds were emphatically examined through dynamic time-history calculation of nonlinear finite element numerical simulation. The comparison and analysis of the values of the wind-induced vibration coefficient formulas of the international typical codes were carried out and verified by numerical calculation results. The study provided some objective references for the rational revision of the wind-resistant design code for the transmission tower structure in China.