粘滞阻尼器参数对大跨度桥梁抗震性能影响研究

Effects of Viscous Damper Parameters on Anti-seismic Performance of Long-span Bridge

基于流体粘滞阻尼器的力学特性,以荆岳长江大桥为工程背景,研究了附加非线性粘滞阻尼器对大跨度桥梁抗震性能的影响。利用动力非线性时程分析方法,对非线性粘滞阻尼器的阻尼系数和阻尼指数进行了参数敏感性分析,讨论了阻尼器布置位置对减震效果的影响,并与不设阻尼器情况的地震响应结果进行了比较。分析表明:通过在适当的位置设置纵向粘滞阻尼器,可以有效地降低结构在地震作用下关键部位的位移,改善结构构件的地震力;减震效果取决于阻尼器参数;同时,设置阻尼器避免了相邻主梁可能发生碰撞引起的结构损坏。

Based on the mechanical characteristics of fluid viscous damper, the anti-seismic performance of the long-span bridge with non-linear viscous dampers was investigated.Taking Jingyue Yangtze River Bridge for example, the sensitivity analysis on damping coefficient C and damping exponent of viscous damper was performed using non-linear dynamic time-history method, and the effect of seismic response control on viscous dampers placed in different positions was discussed. It indicates that （1） setting dampers in longitudinal direction of bridge can reduce the displacement of key positions and the seismic response of the bridge significantly; （2） vibration- suppressing effectiveness depends on damper parameters; （3） the local damage of components due to the potential collision caused by neighboring members of bridge can be eliminated.