基于新型黏弹性阻尼减震器的跨断层铁路桥梁减震分析

摘要

Based on the design concept of functional separation,a new viscoelastic damping damper was proposed. Taking a railway simply supported bridge of Dunhuang-Golmud railway across strike slip fault zone as the research object,the influence of the new viscoelastic damper on the seismic response of bridge across fault zone was studied by using the artif icially synthetic ground motion time history curve and the nonlinear time history analysis method.The results show that the new viscoelastic damping damper can effectively reduce the relative displacement between the pier and the girder.The effect of seismic isolation is remarkable,and the rate of seismic isolation is above 20%.The influence of the new viscoelastic damping damper on the directional effect is much greater than that of the sliding impact effect.%基于功能分离的设计理念,提出了一种新型黏弹性阻尼减震器.以敦煌—格尔木铁路一座跨走滑断层铁路简支梁桥为研究对象,采用人工合成的地面运动时程曲线,应用非线性时程分析方法研究了新型黏弹性阻尼减震器对跨断层桥梁地震响应的影响.结果表明:新型黏弹性阻尼减震器能有效减小墩梁之间的相对位移,减震效果显著,减震率均在20%以上;新型黏弹性阻尼减震器对方向性效应的影响明显大于对滑冲效应的影响.