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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。
In order to study the seismic response and damping effect of long-span continuous girder bridges with viscous dampers in the longitudinal direction, taking the Qingdao Bay Bridge as the engineering background, a three-span continuous girder bridge (one fixed pier and three free piers ) 1/20 scale model, and carried out the conventional design of the bridge and the bridge between the free pier and the bridge girder longitudinal viscous damper bridge shaking table comparison test. The results show that with the continuous beam bridge model with damper, the structural damping increases gradually under seismic excitation, the displacement response of the main beam decreases, and the internal force of the fixed pier bottom decreases, which is in favor of the overall coordinated force of the continuous beam bridge, and the damping The effect becomes obvious with the increase of earthquake intensity. Reasonable choice of damper parameters can achieve good damping effect under the action of small earthquake, moderate earthquake and large earthquake.