双柱悬索拉线塔塔柱参数共振研究

双柱悬索拉线塔在强风荷载作用下会出现动力失稳现象，准确评估它的动力稳定性对输电线路的安全性具有重要意义。本文先根据双柱悬索拉线塔塔柱的受力特点，将其简化为下端铰支、上端弹性支撑的等截面柱；接着运用Hamilton原理建立偏微分运动方程，并通过Galerkin方法将其分解为常微分方程，然后根据鲍洛金提供的方法建立临界频率方程，从而得到塔柱的主要动力不稳定域；最后从实际工程中选取双柱悬索拉线塔进行算例分析，结果表明此算例中的塔柱不存在参数共振现象。

Research on parametric resonance of double column suspension cable guyed tower

Dynamic instability phenomenon of suspension cable guyed tower will appear in strong wind, how to assess the stability of suspension cable guyed tower precisely is very important for the safety of transmission line. This article is according to the stress characteristics of suspension cable guyed tower, equivalently simplifies it into an uniform cross section column with hinge support at the bottom and elastic support on the top. Partial differential equation of emotion is established by Hamilton theory, and the partial differential equation is decomposed into ordinary differential equation by Galerkin method. Then, the critical frequency equation is established according to the method provided by Bolotin, and the main dynamic instability domain of pylon is obtained. Finally, pick up double column suspension cable guyed tower selected in actual engineering for example analysis, the results show that this example does not exist in the parametric resonance phenomenon.