曲率半径变化对曲线梁桥粘滞阻尼器减震效果的影响  

Influence of Variation of Radius of Curvature on Seismic Mitigation Effectiveness of Viscous Dampers for Curved Girder Bridge

作　　者：陈树刚[1] 亓兴军[1] 

机构地区：[1]山东建筑大学土木工程学院,山东济南250101

出　　处：《公路交通科技》2012年第8期56-59,86,共5页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(50908135;51178258);山东省交通科技计划项目(2009Y10)

摘　　要：建立某曲线刚构-连续组合梁桥的空间有限元计算模型,在桥梁活动支座部位设置粘滞阻尼器,进而考虑曲率半径的变化,计算分析了结构在3条3向地震动作用下曲率半径变化对结构反应以及粘滞阻尼器减震效果的影响。结果表明:不添加阻尼器的曲线梁桥的动力反应不仅与曲线桥的曲率半径有关,而且还跟地震动特性有关;添加粘滞阻尼器后控制点内力在不同地震动作用下均随着曲线桥曲率半径的增大而增大;粘滞阻尼器对于曲线桥控制点内力和主梁位移的减震率在不同地震动作用下均随曲线桥曲率半径的增大而减小。为粘滞阻尼器在不同半径曲线梁桥上的应用提供了理论指导。The 3D FE computational model of a curved rigid-continuous composite girder bridge was established, viscous dampers were set at the positions of sliding bearings. Considered the variation of radius of curvature, the effect of variation of radius of curvature on structural response and seismic mitigation effect of viscous dampers under three ground motions in three directions was analyzed. The results show that （ 1 ） the dynamic response of curved girder bridge without viscous dampers related to both radius of curvature and ground motion characteristics; （2） with viscous dampers, the internal force of control point increased when the radius of curvature increased under different ground motions; （3） the internal force of control point and seismic mitigation ratio of displacement of main girder due to viscous dampers decreased when the radius of curvature increased under different ground motions. The research provided theoretical guidance for application of viscous dampers on curved girder bridges with different radius.

关 键 词：桥梁工程 曲线刚构-连续组合形式梁桥 粘滞阻尼器 减震率 曲率半径 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]