【摘要】 输电塔为高耸结构,具有柔度大、阻尼小的特点,对风载荷非常敏感,易发生振动疲劳损伤和极端条件下的倒塌破坏。因输电塔在下击暴流作用下的倒塌事故近年来屡见不鲜,故对在役输电塔结构进行下击暴流作用下的安全评定显得非常重要。根据已有的资料归纳出下击暴流的风暴特征,并从风工程的角度确定了下击暴流的风载荷值。为了模拟输电塔在役状态,分别对其可能出现的螺栓脱落、拉杆塑性疲劳断裂、压杆失稳3种损伤进行了ANSYS有限元分析,进而得出考虑损伤的输电塔有限元模型,为输电塔安全性研究提供参考。更多还原

【Abstract】 The high-rise structure of power transmission tower is fairly sensitive to wind load and has the characteristics of large flexibility and small damp,and is easy to have vibration fatigue and collapse. In recent years,the collapses of power transmission towers under the action of downburst are very common. So,it is important to assess the safety of the existing power transmission towers under downbursts. In this article,the wind load of downburst was decided according to it’s storm character-istics and the theory of wind engineering. To simulate the working transmission towers,the falling of some bolts,instability and fracture of some members were considered by ANSYS. Then,the model of transmission considering fatigue for safety assessment was built.更多还原