Research on the Impact of Damping to the Flutter Derivatives of Steel Truss Suspension Bridge
The flutter derivative is the important basic tache of bridge flutter stability analysis.Taking the Liujiaxia Bridge in Gansu province as the research object,this dissertation studies the impaction of damping ratio on the flutter derivatives and the critical wind speed through different series of section model vibration test.The results showed that the change of vertical bending and torsional damping ratio have no obvious regular influence on the eight flutter derivatives.But the changing of vertical bending and torsional damping ratio have the greatly impact on the critical wind speed at 0° and-3° angle of attack.When it is at 0° angle of attack,the vertical bending damping ratio ζh is increased by 23%,the torsional damping ratio is increased by 0.63%,the flutter critical wind speed is increased by 4%;when the ζh is increased by 1.04%,the ζα is increased by 0.87%,the flutter critical wind speed is increased by 7%.When it is at-3° angle of attack,the vertical bending damping ratio remained around 0.8%,the torsional damping ratio is increased from 0.65% to 1.05%,the flutter critical wind speed is increased by 14%; when the ζα is increased from 0.65% to 2.05%,the flutter critical wind speed is increased by 24 %.When it is at +3 °angle of attack,the vertical bending and torsion damping ratio have little effect on the flutter critical wind speed.
bridge engineering suspension bridge wind tunnel test flutter derivatives damping
Bai Hua Fang Cheng Li Yu
Key Laboratory of Ministry of Communications for Bridge Detection & Reinforcement Technology,Changan University, Xian 710064, Xian, China
国际会议
西安
英文
325-329
2012-08-24（万方平台首次上网日期，不代表论文的发表时间）