论文部分内容阅读
以某大型输电塔架为工程实例,采用数值风洞试验与有限元计算相结合的方法,以新疆阿拉山口大风区不同高度处的风速时程作为荷载,研究了高耸输电塔架的抖振响应.输电塔的平均三分力系数在导线平面方向上明显大于垂直于导线平面方向,但其扭矩的作用较小.输电塔架下部风振作用的脉动特性强于上部,其各节点对附近其他节点的风振特性的影响程度与节点之间的距离密切相关,距离越近,干扰越强,反之则越弱.输电塔架的柔性越大,脉动风的作用就越显著,必须进行风致振动的分析.
Taking a large-scale power transmission tower as an example, the numerical wind tunnel test and finite element method are combined to study the wind-buffering response of the towering tower with the wind speed time-history at different altitudes of the Alashankou gassy in Xinjiang. The average third-component force coefficient of transmission tower in the direction of the conductor plane is obviously greater than that in the direction perpendicular to the conductor plane, but its torque effect is small.The pulsating characteristics of the wind-induced vibration in the lower part of the power transmission tower are stronger than those in the upper part, The influence degree of wind vibration characteristics of nodes is closely related to the distance between nodes, the closer the distance is, the stronger the interference is, and vice versa is weaker.The larger the flexibility of transmission tower, the more obvious the effect of fluctuating wind is, and the wind-induced vibration Analysis.