车轨桥空间耦合振动引起的环境振动与隔振措施

城市轨道交通车轨桥系统产生的振动通过周边土体传到建筑物基础从而引起建筑物的振动.针对该问题,首先建立了车辆-无碴轨道-桥梁系统空间耦合振动模型,通过随机振动分析得到桥墩墩底反力;然后建立了桥梁周边土体-建筑物系统的三维分析模型,得到了周边土体及建筑物的振动影响;最后在以上土体-建筑物三维模型中加设隔振沟进行隔振,分析其隔振效果.分析结果表明,隔振沟的隔振效果显著.

Study on Ambient Vibration Induced by Spatial Coupling Vibration of Vehicle-Track-Bridge System and Isolating Measures

Building vibration is induced by spatial coupling vibration of building foundation transferred from vehicle-track-bridge system of urban rail transportation through ambient soil. Aiming at this problem, a model for spatial coupled vibration of vehicle-sludgelesstrack-bridge system is established in this paper, and then the reactions at bottom of bridge piers are obtained by random vibration analysis. A three-dimension finite element model of soil-building is afterward established, the vibration of ambient soil and surrounding building are numerically analyzed. And vibration isolation trench is added to the model, the effect of vibration isolation is analyzed numerically, it shows that the vibration isolation effect is significant.