【摘要】 针对目前国内关于斜拉桥伸缩缝间隙对斜拉桥地震响应影响规律的研究还不够深入和全面,以九江斜拉桥为分析对象,建立碰撞分析模型,不仅较为系统地分析了伸缩缝间隙对斜拉桥与引桥之间碰撞响应的影响规律,而且研究了伸缩缝间隙对斜拉桥关键截面内力和梁端纵向位移的影响情况,并与设置纵向阻尼器后的情况进行了对比分析。研究表明:伸缩缝间隙不仅对伸缩缝处的碰撞响应有较大影响,而且对引桥固定墩墩底弯矩、塔底弯矩及梁端纵向位移响应也有一定影响。设置纵向阻尼器不仅可以有效降低伸缩缝处的碰撞响应,而且对控制斜拉桥主桥关键截面的内力和位移响应均有较好的效果,是一种比较理想的斜拉桥减震措施。更多还原

【Abstract】 It is not overall deeply about the research of influence regularity of expansion joint gap on cable-stayed bridge seismic response.Taken the Jiujiang river cable-stayed bridge for example,the collision analysis models were built,the regularity of influence of expansion joint gap on the collision between cable-stayed bridge and approach span was studied systematically,and the influences of expansion joint gap on key sectional force and beam end longitudinal displacement were researched.And then,the comparison of the situations pre and post setting damper was performed.The results show that the expansion joint gap not only has rather influence on cable-stayed seismic collision response at expansion joint,but also has some influence on approach span fixed pier bottom moment,pylon bottom moment and beam end longitudinal displacement.Setting longitudinal dampers not only can reduce the collision response at expansion joint effectively,but also can control the key sectional force and displacement response.It is a better shock absorption measure for cable-stayed bridge.更多还原