论文部分内容阅读
针对1 000kV特高压输电钢管塔的结构特点建立铁塔有限元模型,采用AR自回归模型模拟出的脉动风荷载对模型分别进行0°风向和90°风向工况的时程分析,得到杆塔在不同风攻角作用下的响应特点以及杆塔各段的加速度方差.根据时程分析结果分别计算铁塔正侧面的各段塔身及横担的风振系数,经过比较发现横担在0°风向作用下的风振系数明显小于其在90°风向作用下的风振系数.建议在杆塔设计中对铁塔正侧面采用不同的风振系数,可以有效地降低铁塔用钢量.
According to the structural characteristics of 1 000kV UHV transmission steel pipe tower, the finite element model of the tower is established. The time history analysis of 0 ° wind direction and 90 ° wind direction conditions using the fluctuating wind load simulated by the AR autoregressive model is carried out, Wind attack angle under the action of the response characteristics and the tower of the acceleration of the segments of the tower.According to the time-history analysis of the tower are calculated on each side of the tower body and cross-arm wind-induced vibration coefficient, after comparison found that the cross-arm in the 0 ° wind direction The wind vibration coefficient is obviously smaller than the wind vibration coefficient under 90 ° wind direction.It is suggested to adopt different wind vibration coefficient on the positive side of the tower in the tower design, which can effectively reduce the steel consumption of the tower.