高耸变截面输变电塔架结构振动分析

Vibration Analysis of Transmission Tower with High-rise Variable Cross Section Structure

分析高耸变截面输变电塔架结构的动力特性以及对于灾害的预防措施。通过对塔架结构的简化模型分析,建立并求解结构动力学平衡方程,从而得出动力特性数学表达。计算推导公式较为准确地模拟了塔架结构的受力状态,推导结果也基本反映了塔架的动力特性:随高度的增加其振动频率逐渐减小,并且这种变化呈增大趋势。设计和施工时应充分分析塔架结构的动力特性,尤其是在地震频发和风荷载较大地区,提出合理的结构处理措施,利用或者减小动力特性对高耸变截面塔架结构的影响,使塔架结构更加安全。

The dynamic characteristic of transmission tower with high-rise variable cross section structure and the prevention measure against disaster are analyzed. Based on the analysis of the simplified model of the tower structure, the structure dynamic balance equation is built and solved, and the mathematical expression of the dynamic characteristic is obtained. The derived lbrmula can simulate precisely the force state of the tower structure, and the result reflects the dynamic characteristic of the tower, such as the higher the height the lower the vibration frequency. So the dynamic characteristic of the tower structure must be considered during the design and construction process especially in the area of high frequent earthquake and large wind load. Reasonable measures are proposed to reduce the influence of the dynamic characteristic on such transmission tower, which make the tower structure more secure.