市域铁路桥梁主要技术参数研究

Research on Main Technical Parameter of Bridge for Suburban Railway

市域铁路桥梁技术标准应与市域铁路设计速度及市域铁路车型相匹配,考虑市域铁路在轨道交通体系中的定位,还应与市域铁路的功能定位相协调,以体现设计标准的技术经济合理性。在分析适合市域铁路的载荷图式和车体的基础上,采用车桥耦合动力分析模型对欧盟挠跨比限值进行验证,提出了适用于我国市域铁路ZS设计荷载标准及单双线梁体的挠度限值,并列出适用条件。在分析残余徐变变形限值的形成和影响因素的基础上,提出我国市域铁路桥梁梁体的竖向挠度限值建议。并以我国主要市域铁路桥梁形式为例,提出了主要桥面布置参数的确定原则和建议。通过对上述梁体竖向挠度限值、残余徐变变形限值和桥面布置参数的分析,为我国市域铁路桥梁设计和建造的适用性和经济合理性提供了保障,为相关市域铁路技术标准的编制提供了参考。

The technical standards of bridge for suburban railway shall match with the design speed and the car type. Considering the position of suburban railway in the rail transport system, it shall coordinate with the function positioning of suburban railway to reflect the economic feasibility of the design standard. Based on the analysis of load diagram and car-body suited for suburban railway, it shall adopt the vehicle-bridge coupling dynamic analysis model to verify the EU limit of deflection span ratio, then it proposes that the deflection limit of ZS design load standard and single/double-line beam for China suburban railway and lists the application conditions. After analyzing the cause and influencing factors for remnant creep deformation limit, it proposes the suggestions for vertical deflection limit of China suburban railway bridge beam. Taking the main bridge deformation in China for example, this paper concludes the certainty principle and suggestions for bridge deck layout parameter. Through the research on vertical deflection limit, remnant creep deformation limit and the layout parameter, the analysis ensures the applicability and economic feasibility of the design and construction for suburban railway bridge and provides the references for the compilation of relevant railway urban technical standard.