东平水道特大桥并联混合式减振方案研究

Research on Parallel Hybrid Vibration Reduction Scheme for Dongping Waterway Grand Bridge

为增强桥梁结构的抗震能力和耐久性,针对大跨度铁路桥梁车致振动及地震响应的动力特点,以东平水道特大桥为工程背景,提出一种并联混合式减振方案,研究黏滞阻尼器对纵向滑移体系桥梁地震响应的控制效果,分析不同控制体系对列车荷载引起结构响应的影响。研究结果表明,黏滞阻尼器能显著减小大跨度铁路桥的地震结构位移和内力响应;泄压阀锁定装置对列车制动力和行车荷载的抑振能力优于黏滞阻尼器;当黏滞阻尼器和泄压阀锁定装置协同工作时,在降低二者出力值的同时可实现对列车荷载更好的控制效果,由于传力路径的改变,控制后的墩底剪力和弯矩均有所增大,但锁定装置的增大效应更小。

In order to enhance the seismic capacity and durability of bridge structures,in view of the dynamic characteristics of vehicle-induced vibration and seismic response of long-span railway bridges,a parallel hybrid vibration reduction scheme was proposed based on the case of Dongping Waterway Grand Bridge.To study the control effect of viscous dampers on the seismic response of the bridge with longitudinal slip system and to analyze the influence of different control systems on the structural response caused by the train load.The results show that viscous dampers can significantly reduce the seismic structural displacement and internal force response of long-span railway bridges.The anti-vibration capability of the lock-up device with pressure relief valve on the braking force and running load of the train is better than that of the viscous damper.When the viscous damper and the lock-up device with pressure relief valve work together,both can achieve better control of the train load while reducing the output force value of the two.Due to changes in the force transmission path,both the shear force and bending moment at the bottom of the controlled pier increase,but the increasing effect of the lock-up device is minor.