【摘要】 输电塔-线体系具有高柔特点,风振作用显著,为了研究输电塔-线体系的舞动机理和优化输电塔风振控制方案,基于ANSYS建立了输电塔-导地线-绝缘串的塔线耦合体系非线性有限元模型,提出了采用重启动技术进行覆冰导线的水平、竖向、扭转3方向舞动和输电塔风振分析的方法;编制了风速场模拟程序,进行了输电塔-线耦合体系的舞动及风振仿真;同时进行了4种铅芯橡胶阻尼器布置方案对输电塔振动控制计算。通过计算分析得到了输电塔-线体系的3方向舞动的振幅和输电塔的内力响应,对输电塔的铅芯橡胶阻尼器布置方案进行了优化。结果表明,输电塔-线体系在风振作用下塔线耦合作用显著,塔-线耦合体系优于简化模型以及铅芯橡胶阻尼器对输电塔-线体系风振有良好的控制效果并且安装在塔身上半部分效果显著。更多还原

【Abstract】 The transmission tower-line coupling system has the properties of high flexibility,and significant vibration of transmission tower system under wind loads may cause many inverted tower accidents,so it is important to research the wind-induced vibration control for transmission tower-line system.To study the galloping behavior of the transmission tower-line and to optimize tower wind-induced vibration control scheme,the finite element analysis program ANSYS was used to model the nonlinear behavior of transmission tower-line coupling system including transmission tower-cable-insulator,and the restarting technology was proposed to solve the vertical,horizontal and torsion galloping of transmission conductors and wind-induced vibration of transmission towers.Meanwhile,a program of wind velocity fields was compiled,and galloping of a transmission tower line coupling system was simulated to obtain the amplitude of the conductors and the internal forces of the transmission towers.Moreover,four proposals of lead viscoelastic dampers(LVDs) layout were described.The displacement and inter force of the transmission tower with LVDs were compared to those without LVDs.Finally,the optimum scheme of the wind-induced vibration effect under the four proposals of LVDs layout was reached.The conclusions can be drawn that the transmission tower-line system,superior to the tower model,has the properties of high tower line coupling clearly,so it is necessary to consider the transmission lines and the tower-line coupling model;the effect of the wind-induced vibration control under the LVDs layout is significant and the best layout location of the LVDs is the upper part of the tower.更多还原