铁路桥梁设计动力系数研究进展

Research Progress on Dynamic Coefficient of Railway Bridge Design

随着我国铁路运输的发展,单一的列车荷载图式难以反映新形势下的铁路运输状态。我国铁路于2017年颁布实施了TB3466 2016《铁 路列车荷载图式》,对客货共线、重载、高速和城际铁路应采用的列车荷载图式及应用方法进行了规定。与图式配套的动力系数还未开展相关研究,桥梁设计时只能沿用既有规定。针对这种情况,本文对国内外动力系数的研究进展及应用现状进行了系统调研和分析。研究发现由于各国的运输模式不同,采用的荷载图式和配套的动力系数均有所差别。我国须要对既有动力系数的适应性展开研究,并进一步完善设计动力系数体系。

With the development of railway transportation in China,a single train load diagram is difficult to reflect the railway transportation state in the new situation.In 2017,China′s railway issued and implemented TB 3466-2016 Railway Train Load Diagrams,which specifies the train load diagram and application methods that should be used for mixed passenger and freight railway,heavy haul railway,high speed railway and intercity railway.The dynamic coefficient matching with the diagram has not been studied,so only the existing regulations can be used in bridge design.In view of this situation,the research progress and application status of dynamic coefficients at home and abroad were investigated and analyzed systematically in this paper.It is found that due to the different transportation modes in different countries,the load diagrams and the matching dynamic coefficients are different.In China,it is necessary to study the adaptability of existing dynamic coefficients and further improve the design dynamic coefficient system.