东海大桥粘滞阻尼器参数研究

Research on viscous damper parameters of Donghai Bridge

以东海大桥为实际工程背景,研究非线性粘滞阻尼器对该桥抗震性能的影响。利用非线性动力时程分析方法,对非线性粘滞阻尼器在该桥中的不同布置位置以及非线性阻尼器的阻尼系数C和阻尼指数ξ进行了参数敏感性分析,并与未设置粘滞阻尼器情况的地震响应进行了比较。分析结果表明:在主桥纵桥向设置非线性粘滞阻尼器后,通过选择适当的布置位置和粘滞阻尼器的参数可以有效降低结构在地震作用下关键部位的相对位移,同时也改善了结构构件的地震力。此外,还避免或减轻了相邻构件可能发生的碰撞以及碰撞引起的构件局部损坏。

The present study examines the seismic behavior of Donghai Bridge with focus on the positions and two parameters of damping coefficient C and damping exponent ξ of the supplemental non-linear viscous dampers through non-linear dynamic time-history analysis. The parameter sensitivity study indicates that setting dampers in longitudinal direction of bridge can reduce the relative displacement of key positions and the response of the bridge, moreover, eliminate or reduce local damage of components due to the potential pounding neighbouring members of the bridge.