大跨度公轨两用单跨悬索桥研究

研究大跨度公轨共用单跨悬索桥梁式方案及桥面系布置方式,分析桥梁结构的受力特点,提出影响列车行车安全的控制因素及设计技术措施,确定合理的竖向刚度要求,总结设计标准和关键技术措施。研究认为,随着悬索桥跨度的增大和结构质量的增加,主梁弯曲的贡献率逐渐减小,而主缆重力刚度的贡献率逐渐增加;控制悬索桥刚度的主要因素有跨度、主梁截面、主缆截面、矢跨比及桥塔抗推刚度;通过控制主梁竖向刚度、梁端折角及扭转刚度等参数可以保证轨道的平顺性;通过合理的轨道桥面系体系的布置,可以使轨道结构受力更加合理。

Research on Long-span Highway and Light Rail Single-span Suspension Bridge

The paper studies the scheme and layout of the long-span highway and light rail suspension bridge,analyzes the bridge structure force characteristics,puts forward the control factors of rail traffic safety and technical measures for design,determines the reasonable vertical stiffness and summarizes the design standard and key technical measures. The research results show that with the increase of the span of suspension bridge structure and its structural mass,the main beam bending contribution rate decreases gradually,while the main cable gravity stiffness contribution rate increases little by little; the main factors controlling the stiffness of suspension bridge include span,main cable cross-section,rise span ratio and tower anti push rigidity; by controlling such parameters as main beam vertical stiffness,beam angle and torsional stiffness,the smoothness of the track can be ensured and reasonable arrangement of track bridge deck system can make the structural force of the track more reasonable.