钢管组合大跨越输电塔导地线耦合效应研究

利用ANSYS软件建立了跨越珠江铁桩水道的220kV钢管组合大跨越输电塔线体系的空间数值分析模型。通过对实际工程进行环境振动测试,识别出输电塔耦合导地线的振动模态,验证了输电塔线体系有限元模型和理论计算的正确性。从动力特性和地震反应方面研究了单塔和塔线体系的动力特性和地震响应特点,分析得到关于输电塔导地线耦合效应的初步认识,进一步揭示了导地线对输电塔的耦合作用规律。研究表明,悬挂的导地线不仅具有质量效应,同时在线路的纵向和侧向还施加了一定的刚度效应。地震反应分析中可知导地线对输电塔具有一定的减震效应,并指出导地线的减震效应是否具有普遍性,还需要进一步研究。上述研究对类似输电塔的抗震、抗风设计有一定参考意义。

Research on cables coupled effect of combo steel tube tower for large crossing transmission lines

With ANSYS program of the finite element method, it was established a new spatial analytical-numerical model of 220 kV combo steel tube tower for large crossing transmission lines crossing Tiezhuang canal of Pearl River. Firstly, the exactitude of finite element modal and theoretic calculation was proved by environmental vibration testing and modal identification. In addition, some specialties were acquired by analyzing dynamic characteristics and seismic response of the tower considered transmission lines and none-considered transmission lines. The effects of transmission lines applied to tower were studied and further disclosed coupled regularity of transmission lines applied to tower. It is shown that suspended cables have mass effects, which is not ignored. Simultaneously, suspended cables have coupled stiffness effects applied to tower on cross direction and longitudinal direction. Furthermore, it is found that suspended cables can depress seismic response of transmission towers. Finally, it is pointed out that suspended cable's effect of depress seismic response whether or not have universality need to be further studied and cognized. The above research and analysis have some reference values for seismic and wind resistance design of similar transmission tower.