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地震对输电塔线的安全运行产生了威胁。选择输电线路工程中常用的5A-ZM4猫头塔为研究对象,利用ANSYS软件建立两塔三线输电塔线体系有限元模型,计算塔线体系的自振频率和振型并分析影响其动力特性的主要因素。选用天津波、EI-Centro波、上海人工波3条典型地震波,通过调整加速度峰值的方法研究塔线体系的位移响应非线性行为以及弹塑性极限状态。分析结果表明,强震作用下塔线体系进入非线性极限状态时,塔顶最大位移主要集中在H/200~H/100(H为塔高)之间;塔身第2至第3横隔之间杆件将率先进入弹塑性极限状态,产生较大塑性变形,使体系表现出较强的非线性特征。
The earthquake posed a threat to the safe operation of transmission towers. The 5A-ZM4 cattower, which is commonly used in transmission line engineering, is chosen as the research object. The finite element model of two tower three line transmission tower system is established by using ANSYS software. The natural frequency and mode shape of the tower line system are calculated and the dynamic characteristics of the tower system are analyzed major factor. Three typical seismic waves of Tianjin wave, EI-Centro wave and Shanghai artificial wave are selected to study the nonlinear response of tower system and the elasto-plastic limit state by adjusting the acceleration peak. The results show that when the tower system enters the nonlinear limit state under the action of strong earthquake, the maximum displacement of the tower top mainly concentrates between H / 200 ~ H / 100 (H is tower height) Between the rod will be the first to enter the elastic-plastic limit state, resulting in greater plastic deformation, the system showed a strong nonlinear characteristics.