铁道标准设计2025，Vol.69Issue(9)：72-80,9.DOI:10.13238/j.issn.1004-2954.202505240001
高速铁路连续梁-钢管混凝土拱组合体系桥梁关键参数研究
Study on Key Parameters of High-speed Railway Continuous Beam Concrete-Filled Steel Tube Arch Composite System Bridge
摘要
Abstract
To clarify the influence patterns of key structural parameters on the mechanical performance and engineering economic efficiency of high-speed railway continuous beam-concrete-filled steel tube(CFST)arch composite bridges,the newly constructed Luoshang Grand Bridge on the Pingdingshan-Luohe-Zhoukou high-speed railway was taken as the engineering background.A method combining finite element analysis and orthogonal testing was employed to systematically investigate the influence patterns of side-to-midspan ratio,rise-to-span ratio,and arch-to-beam stiffness ratio on internal forces,deformation,support reaction,and engineering quantities of the bridge structure,aiming to determine reasonable design parameter ranges.The results showed that the side-to-midspan ratio significantly affected the bending moments at the arch springing and crown.When the side-to-midspan ratio increased from 0.3 to 0.6,the negative bending moment at the arch springing reduced by 32.6%.However,when it exceeded 0.6,the vertical deformation of the side span of the main beam significantly increased by 67.4%.The rise-to-span ratio had a limited impact on the internal force of the main beam,but significantly affected the bending moment distribution of the arch rib.When the rise-to-span ratio was 1/5,the positive bending moment at the arch crown decreased by 93.4%compared with that at 1/7,the support reaction coefficient reached its lowest value,and the overall force distribution of the structure was the most reasonable.The arch-to-beam stiffness ratio had the greatest impact on structural force and engineering quantity.When the stiffness ratio exceeded 1∶22,the internal forces increased significantly.When it was less than 1∶45,the deformation of the main beam rapidly increased.The arch-to-beam stiffness ratio showed the highest sensitivity to the bridge engineering quantities,accounting for 62.5%of the total influence.Therefore,to balance structural performance and economic efficiency,a side-to-middle span ratio of 0.4～0.6,a rise-to-span ratio of 1/5,and an arch-to-beam stiffness ratio of 1∶45～1∶22 were recommended.Moreover,the arch-to-beam stiffness ratio could be appropriately reduced to lower engineering costs,provided that mechanical requirements were met.Based on the actual engineering condition of the Luoshang Grand Bridge(side-to-midspan ratio of 0.54),the optimal parameter combination obtained from the orthogonal experiment was an arch-to-beam stiffness ratio of 1∶35 and a rise-to-span ratio of 1/5,which resulted in the lowest engineering quantities and optimal economic efficiency.This provides references for similar projects.关键词
铁路桥梁/连续梁-拱组合体系/参数优化/钢管混凝土/边中跨比/正交试验Key words
railway bridges/continuous beam-arch composite system/parameter optimization/concrete-filled steel tube/side-to-midspan ratio/orthogonal experiment分类
交通工程引用本文复制引用
孙伟良,李金凯,孙立鹏,景铁义..高速铁路连续梁-钢管混凝土拱组合体系桥梁关键参数研究[J].铁道标准设计,2025,69(9):72-80,9.基金项目
河南铁建投集团"揭榜挂帅"科技计划项目(2025HNGTZF02) （2025HNGTZF02）
