大跨越输电塔-线体系的平面内塔-线耦合效应与TMD减震控制研究

摘要

建立了典型的大跨越输电塔-线体系的有限元模型,分析了独立塔和大跨越塔-线耦合体系的动力特性,基于“模态组”概念,通过两者动力特性的对比研究了大跨越输电塔-线体系的塔-线耦合效应,结果表明塔-线耦合效应对大跨越输电塔动力特性有较大影响.分别基于独立塔和塔-线耦合体系的动力特性对两个调谐质量阻尼器(tuned mass damper,TMD)的参数进行了优化,对两个TMD方案在地震动激励下的减震控制效果进行了对比.结果表明,大跨越塔-线耦合体系与独立塔的动力特性存在很大差异,在大跨越输电塔-线体系TMD减震控制中考虑塔-线耦合效应,能够更好地发挥TMD振动控制的作用.%A typical FEM model of large crossing transmission tower-lines system(LCTL) is established. The dynamic characteristics of freestanding tower and LCTL are analyzed. The effect of tower-line coupling is studied through the comparison of dynamic characteristic of the two systems based on the concept of 'mode group'. The performance of tuned mass dampei (TMD)optimized with dynamic characteristics of LCTL is compared with that optimized with dynamic characteristics of freestanding tower. The results show that the dynamic characteristics of freestanding tower are significantly different from that of LCTL, and tower-line coupling affects the performance of TMD significantly for LCTL- TMD performance will be improved for LCTL when considering tower-line coupling effect.