Study on Design Parameters of Girder Bridge Span Structure in City Railway

Abstract

[Objective] The compiling of TB 10624—2020 Urban (Suburban) Railway Design Code follows most of the content of GB 50157—2013 Subway Design Code and TB 10623—2014 Intercity Railway Design Code. In order to verify the reasonability of the design parameters of girder bridge span structure in TB 10624—2020, such as deflection-span ratio, natural vibration frequency and dynamic factor, further research is needed. [Method] According to the differences in bridge design codes between city railway and other types of railways, the reasonable design limits of deflection-span ratio, natural frequency and dynamic factor of city railway girder bridge span structure are analyzed on the basis of the theoretical calculation of train-bridge coupling dynamic simulation method. [Result & Conclusion] Due to the train load differences, the deflection design limits for girder bridge span structure in city railway should not follow TB 10623—2014 and the design standard that meets the rigidity requirement of city railway itself should be formulated. The natural frequency design limit applicable to the girder bridge span structure of city railway is proposed. The dynamic coefficient of city railway bridge following that of mixed passenger/freight transport railway bridge in TB 10002—2017 Code for Design of Railway Bridges and Culverts is reasonable and has certain safety guarantee