中国铁道科学2023，Vol.44Issue(6)：87-94,8.DOI:10.3969/j.issn.1001-4632.2023.06.09
城市轨道交通专用斜撑连续刚构桥关键设计参数研究
Research on Key Design Parameters of Diagonal Brace Continuous Rigid Frame Bridge for Urban Rail Transit
摘要
Abstract
Relying on the Jialing River Bridge of Chongqing Rail Transit Line 15,and considering the main stress state and mechanical characteristics of the structure formation process,the mechanical models of the main stress state are simplified,and the key design parameters,such as main beam diagonal brace fulcrum,diagonal brace angle and stiffness,pier height,are systematically studied.The results show that,the fulcrum of main beam diagonal brace has a great influence on the distribution of the structural bending moment.The fulcrum location should be designed according to the bearing pressure principle of the main beam bending diagonal brace.The length ratio of the upper chord beam segment to the midspan beam segment should be 0.41-0.53.When the location of the main beam diagonal brace fulcrum is reasonable,the change of diagonal brace stiffness and angle has little impact on the bending moment,but the angle of diagonal brace directly determines the axial force of the upper chord beam and diagonal brace.Considering the engineering economy,the angle of diagonal brace should be 25°-45°.When the location,the angle and stiffness of diagonal brace fulcrum are reasonable,the ratio of pier height to main span should be greater than 1/6.关键词
轨道交通专用桥/斜撑连续刚构/主梁斜撑支点/斜撑角度/墩高Key words
Urban rail transit bridge/Diagonal brace continuous rigid frame/Main beam diagonal brace fulcrum/Diagonal brace angle/Pier height分类
交通工程引用本文复制引用
王猛,李伟,狄谨..城市轨道交通专用斜撑连续刚构桥关键设计参数研究[J].中国铁道科学,2023,44(6):87-94,8.基金项目
国家重点研发计划项目(2016YFC0701202) （2016YFC0701202）
