有轨电车桥梁跨挠比限值的研究

Research on Span Deflection Ratio of Tramcar Bridge

车辆活载作用下的桥梁跨挠比是轨道交通桥梁刚度设计的重要指标,而目前缺乏针对有轨电车的桥梁跨挠比规范限值。采用有限元方法建立有轨电车车辆模型和不同跨度简支梁模型,基于模态叠加法原理和轮轨耦合关系建立列车—桥梁系统耦合振动分析模型,以满足列车乘坐舒适性要求为原则来确定桥梁的跨挠比限值。结果表明:采用不同的乘坐舒适度标准对桥梁的跨挠比进行限值时结果有所差别,但都没有《地铁设计规范》中的限值严格。

The span deflection ratio of bridge under vehicle load is an important index for the design of the rigidity of rail transit bridge.However,there is no standard limit for the span deflection ratio of the tramcar bridge.By using the finite element method,the tramcar model and different spans simply supported girder bridge model were established.And based on the principle of mode superposition method and wheel rail coupling relationship,the vehicle-bridge coupling vibration model was established.According to the requirements of ride comfort,the span deflection ratio limit of bridge was determined.The study shows that the results are different when the span deflection ratio is limited by different ride comfort standards,but none of them are strictly limited by the code for subway design.