【摘要】 为研究大跨连续梁桥在纵向设置粘滞阻尼器后的结构地震响应和减震效果,以青岛海湾大桥为工程背景,制作完成了3跨连续梁桥(1个固定墩、3个自由墩)的1/20缩尺比例模型,并进行了常规设计桥梁及在自由墩顶和桥面主梁之间纵向增置粘滞阻尼器桥梁的振动台对比试验。研究结果表明:设置阻尼器的连续梁桥模型,在地震激励下结构阻尼逐渐增加,主梁位移反应减小,固定墩墩底内力减小,有利于连续梁桥整体协同受力,且减震效果随地震烈度的增加而逐渐明显;合理选择阻尼器参数,可以在小震、中震、大震作用下均取得较好的减震效果。更多还原

【Abstract】 In order to investigate the earthquake response and seismic-reduced effect of long-span continuous girder bridge with longitudinal viscous dampers,regarded Qingdao Gulf Bridge as engineering background,a 1/20 scale model of three-span continuous girder bridge(one fixed pier and three free piers) was designed and studied under shaking table test,in which three viscous dampers were installed between the tops of free piers and the girder in longitudinal direction.The research results indicate that under earthquake excitation,the damping ratio of continuous girder bridge structure with damper increases rapidly;at the same time,the main girder’s displacements and the fixed pier’s internal forces reduce.The seismic-reduced effects of girder’s displacements and the fixed pier’s forces increase when the input earthquake intensity gets stronger.Selecting suitable parameters of damper can get good seismic energy dissipating effect.更多还原