地震和列车制动力作用下铁路斜拉桥振动控制研究

Research on Vibration Control of Railway Cable-stayed Bridge under the Actions of Earthquake and Train Braking Force

为解决半飘浮体系铁路斜拉桥在地震和列车制动力作用下的振动问题,保障行车稳定和结构安全。从分开控制角度出发,利用非线性时程分析方法,研究一种新的组合控制体系对斜拉桥纵向振动响应的控制效果。结果表明:对于列车制动力引起的小速度纵向振动,锁定装置比黏滞阻尼器更加敏感,控制效果更好;通过设置合理参数阻尼器可有效减小铁路斜拉桥在地震下的纵向位移和塔底弯矩,减震率均在56%以上。基于黏滞阻尼器与泄压阀锁定装置自身独特性能的组合体系,在一定程度上既能弥补单一方案的不足,又能同时满足大跨度铁路斜拉桥控制列车制动力和地震响应需要。

In order to solve the vibration problem of the semi-floating system railway cable-stayed bridge under the actions of earthquake and train braking force, and ensure the stability of the train and the safety of the structures, the control effect of a new combined control system on the longitudinal vibration response of the cable-stayed bridge is studied from the perspective of separate control by using nonlinear time history analysis method. The results show that for the low-velocity longitudinal vibration caused by the braking force of the train, the lock-up device is more sensitive and effective than the viscous damper;by setting dampers with reasonable parameters, the longitudinal displacement of the main girder and the bending moment of the tower bottom of the railway cable-stayed bridge under earthquake can be effectively reduced, and the shock absorption rate is above 56%. The combination system based on the unique performance of viscous damper and lock-up device with pressure relief valve can not only make up for the deficiency of single scheme to a certain extent, but also meet the needs of long-span railway cable-stayed bridges to control train braking force and seismic response.