VIBRATIONS OF A TAUT CABLE WITH THE COUPLING OF DECK AND DAMPER
In previous studies,researchers assume that the dampers support is separated from the anchor plan of the stay-cable and the dampers support is stationary when the deck is vibrating. There is a lack of researches in the effect of the coupling of deck and the damper for the vibration of deck,which influences the performance of damper. A new cable-damper system model which is closer to the actual engineering phenomenon is presented. A solution is presented of the problem of vibrations of a taut cable equipped with a concentrated viscous damper,which considering the coupling of deck and the damper for the deck excitation. The solution is expressed in terms of damped complex-valued modes,leading to a transcendental equation for the complex eigenfrequencies and assuming the ratio of damper installation length to cable length is much smaller than 1. An accurate asymptotic approximation of the damping ratio of the lower modes is obtained.The study shows that the coupling of deck and the damper would influence the optimal external damping parameter,the effect would depend on the stay cables angle of inclination,the damper position. The study also shows that the coupling of deck and the damper would increase optimum damping coefficient. Similar to a damper without considering the coupling of deck and the damper,a universal design curve of a damper also exists.
Stay cable Deck excition Coupling of deck and the damper Damping parameter
Zhi-Yong Zeng Hong-Jun Liu Shu-Ai Luo
Shenzhen Graduate School,Harbin Institute of Technology,Shenzhen 518055,P.R.China
国际会议
The Eleventh International Symposium on Structural Engineering(第十一届结构工程国际研讨会)
广州
英文
1043-1047
2010-12-01（万方平台首次上网日期，不代表论文的发表时间）