【摘要】 以三塔悬索桥型的泰州大桥为工程背景,研究了3种不同桥梁减震措施的减震效果:弹性拉索、粘滞阻尼器、弹性拉索与粘滞阻尼器。弹性连接和粘滞阻尼器提高结构刚度与阻尼以减小结构地震响应。研究结果表明,塔梁间弹性拉索和粘滞阻尼器均可有效减小梁端纵向位移峰值,并使其振动快速衰减,其中以同时设置弹性拉索与粘滞阻尼器的减震效果为最佳。与全漂浮体系相比,上述3种减震措施在不同程度上增加了结构某些构件的内力,其中以仅设置弹性拉索最为明显。更多还原

【Abstract】 A triple-tower suspension bridge,Tai Zhou Bridge,was taken as an example and three kinds of vibration-reduction measures were analyzed in detail,including links between the mid-tower and the girders,viscous dampers between the towers and the girders,and links plus viscous dampers.The links and viscous dampers increase the stiffness and damping ratio to cut down the seismic response of bridge.The results show that the links between mid-tower and girders and viscous dampers can decrease the longitudinal displacement of girders and the vibration of girders decreases quicklys.The measures of links plus viscous dampers have a marked effect on suppressing seismic displacement response of the bridge than the others.Compared with the fully floating system,the above measures increase the structural internal force of some members of the bridge and the measure of installing links between the mid-tower and girders leads to bigger structural internal force than others.更多还原