基于行车安全性的高铁桥梁横桥向减隔震体系研究

针对目前最常用的32 m跨径高铁简支梁桥,同时考虑对行车安全不利的路桥过渡段和墩高改变处,对高铁桥梁的行车安全性能进行了评价;分析了铅芯橡胶支座、摩擦摆支座等常规减隔震方案在高铁桥梁中运用的可行性.分析结果表明,采用盆式橡胶支座的高铁桥梁在地震作用下轨道变形和轨道横向加速度较大,无法满足高速运行的列车的行车安全性要求;...

Transverse seismic isolation system of high-speed railway bridge based on train running safety

Here,aiming at the most widely used 32 m-span high-speed railway simply supported girder bridge,considering transition segments of road and bridge and change places of pier height harmful to train running safety,the safety performance of high-speed railway bridge was evaluated and the feasibility of applying conventional seismic isolation schemes,such as,lead core rubber bearings and friction pendulum bearings in high-speed railway bridge was analyzed.The results showed that track deformation and track lateral acceleration of high-speed railway bridge with pot type rubber bearings are larger,they can’t meet running safety requirements of high-speed trains;after taking conventional seismic isolation measures,the bridge seismic response is reduced,but running safety requirements of train can’t be satisfied at transition segments of road and bridge.Therefore,the anti-impact multi-directional energy-dissipating damper was developed,using it combined with pot type bearing,a transverse seismic isolation system for high-speed railway bridge was proposed to meet requirements of train running safety.It was shown that under action of earthquake,the proposed system can bear a larger impact force at the moment of pot type bearing being cut off,ensure the stiffness of the bridge structure not having mutation in conversion process of the system,control track deformation not exceeding the allowable limit value,and ensure the running safety of trains.