城市高架轨道多层隔振系统影响参数匹配

Parameter Matching on Multi-layer Vibration Isolation System of Viaduct Rail Transit

摘要:

以轨道交通30 m双线混凝土简支箱梁桥为研究对象，考虑扣件轨道板支承桥梁支座多层隔振系统内部耦合机理，建立车轨桥有限元模型(FEM).通过现场试验数据验证模型有效性.利用该模型展开多工况计算分析，研究各层隔振元件刚度的改变对车体、轨道结构、桥梁结构振动响应特性和综合隔振效果的影响规律，获取参数匹配原则.结果表明：高架轨道各层隔振元件宜采用匹配设计，可在改善沿线环境隔振效果的同时，兼顾车轨桥各层子系统动力响应特性.

关键词:城市高架轨道; 扣件; 轨道板支承; 桥梁支座; 参数匹配原则

Abstract:

By taking two simply supported box girder bridges of 30 m as example, a systematic dynamic simulation model of vehicletrackbridge was established, with a consideration of the coupling mechanism of multilayer vibration isolation system. The finite element model(FEM) was verified by a set of field tests. Good agreement between measurement and predicted results proved the effectiveness and accuracy of the model. With the validated simulation model, the effect of resilient parameters on the dynamic response of vehicle, track, slab, bridge wing plate, web plate, bottom plate and bridge pier, was obtained. Finally, parameter matching principle was presented. The results indicate that an optimized elastic parameters matching design of viaducts may improve the isolation efficiency for the vibration environment along railway lines, and ameliorate the dynamic properties of each substructure of vehiclerailbridge systems.

Key words:viaduct rail transit; rail fastener; elastic support of rail plate; bridge bearing; parameter matching principle