Abstract
In this paper, tuned mass dampers with optimal parameters for long span transmission tower-line system are investigated. Equations of motion for a structure-TMD system are derived, and the parameters of TMD, stiffness and damping are optimized, respectively. According to a real project, three-dimensional finite element models of both transmission tower and transmission tower-line system are created and their vibration performances are analyzed using SAP2000 software, respectively. Wind load time history is simulated based on wind theory. Using numerical simulation, vibration control with optimal tuned mass damper installed in transmission tower-line system is carried out. Time history curves and the maximum responses of system without and with tuned mass damper under wind excitation are analyzed and discussed. The results show that the optimal tuned mass damper could effectively decrease the wind-induced response of long span transmission tower-line system.
Highlights
INTRODUCTION(12) demonstrates two curves of maximum axial force of a series of vertical tower elements along the height of tower, the values in optimal TMD curve at any height is all smaller than those in curve without control
The long span transmission tower-line system is a kind of power facility of great significance for such developing country as China
During 1998 wind vibration, four transmission towers collapsed in the east China
Summary
(12) demonstrates two curves of maximum axial force of a series of vertical tower elements along the height of tower, the values in optimal TMD curve at any height is all smaller than those in curve without control. Based on SAP2000 nonlinear time history analysis, the tower-line system with and without optimal TMD is studied, respectively. Height (m) mass ratio and in different directions should be investigated in further study
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