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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。
In view of the current domestic research on the influence of the expansion joints of cable-stayed bridge on the seismic response of cable-stayed bridges, the study of the influence of the gap on the seismic response of cable-stayed bridges is not yet in-depth and comprehensive. Taking the Jiujiang cable-stayed bridge as the analysis object and establishing the collision analysis model, The influence of the expansion gap on the internal forces and the longitudinal displacement of the key section of the cable-stayed bridge was studied and compared with that after the longitudinal damper was set up. The results show that the clearance of expansion joint not only has a great influence on the collision response of expansion joint, but also affects the bending moment of tower pier, the bending moment of tower bottom and the longitudinal displacement response of beam end. Setting the longitudinal damper not only can effectively reduce the impact response at the expansion joints, but also has a good effect on controlling the internal forces and displacement responses of the key section of the main bridge of the cable-stayed bridge. It is an ideal damping measure for cable-stayed bridges.