摘要
钢混结合段是矮塔斜拉桥施工关键部位,结构较为复杂。为研究大跨径铁路混合梁斜拉桥钢混结合段的力学性能,以六律邕江特大桥为工程背景,采用缩尺模型试验方法研究在1.0倍和5.0倍最大轴力工况及最大负弯矩工况下钢混结合段应力分布规律及变形特性。试验结果表明,在两种不同工况作用下钢混结合段构件均处于受压状态,各测点应力变化趋势基本一致;竖向变形在相同工况下的位移差距不大,变形连续平滑且刚度过渡平稳,说明钢混结合段具有良好的承载能力。
The steel-concrete composite section is one of the most important parts of the extradosed cable-stayed bridge,and the structure is more complex.In order to study the mechanical properties of steel-concrete joint section of long-span railway hybrid girder cable-stayed bridge,this paper takes Liulv Yongjiang Bridge as the engineering background,and uses scale model test method to explore the stress distribution law and deformation characteristics of steel-concrete joint section under 1.0 times and 5.0 times maximum axial force conditions and maximum negative bending moment conditions.The test results show that the steel-concrete composite section members are in compression state under two different working conditions,and the stress change trend of each measuring point is basically the same.The displacement difference of vertical deformation under the same working conditions is not large,the deformation is continuous and smooth,and the stiffness transition is smooth,indicating that the steel-concrete composite section has good bearing capacity.
作者
李超
LI Chao(China Railway 14th Bureau Group 3rd Engineering Co.Ltd.,Jinan Shandong 250300,China)
出处
《铁道建筑技术》
2024年第10期147-150,共4页
Railway Construction Technology
基金
中铁十四局集团有限公司科技研发计划项目(913700001630559891202006)。
关键词
矮塔斜拉桥
钢混结合段
力学性能
模型试验
extradosed cable-stayed bridge
steel-concrete composite section
mechanical property
model experiment
