| Title |
Dynamic Characteristics and Wind Response Reduction of a Transmission Tower |
| Authors |
Min Kyung-Won ; Moon Byoung-Wook |
| Keywords |
Wind Response ; Wind Load ; Transmission Tower ; Viscoelastic Damper ; Friction Damper |
| Abstract |
Wind response characteristics of a transmission tower are investigated through stochastic analysis considering the dynamics of a transmission line. The assemblage of the transmission line and insulator are modeled as a double pendulum system connected to the SDOF model of the tower, since its dynamic behavior is dominantly governed by the first mode. It is observed that the background component of overturing moment induced by the wind response of the transmission line has considerable portion in the total overturning moment. Based on this observation, a rotational viscoelastic damper is proposed for the suppression of the transmission line response to reduce wind load on the transmission tower. Also, a friction damper is suggested to investigate wind response reduction when it is installed at a transmission tower. To verify the effectiveness of the proposed dampers, time history analysis is conducted for various wind velocities. From the result of the analysis, the proposed dampers are proved to be effective in both the wind response reduction of a transmission tower and the reduction of the background component rather than the resonance component of the support reaction of the transmission line. |