混合梁悬索桥钢混结合段局部应力分析

Analysis of Local Stress in Steel-Concrete Joint Section of Hybrid Girder Suspension Bridge

为了解混合梁悬索桥钢混结合段受力性能,为该类型桥梁的设计和科研提供参考,以某混合梁悬索桥工程为背景,采用有限元软件对该桥钢混结合段进行施工过程模拟,分析该部位在各施工阶段下的应力分布特点及变化规律。同时,建立边主梁结合段有限元模型,研究钢混结合段中剪力钉受力状态、结合段各部位传力途径和比例等。分析结果表明:该桥结合段钢结构、混凝土应力基本满足规范要求,仅在混凝土局部较小区域位置拉应力偏大,需要在构造上采取相应措施;结合段剪力钉最大受力为52.3kN,小于规范限值,说明剪力钉静力承载力不控制结合段设计。

In order to understand the mechanical behavior of the steel-concrete joint section of suspension bridges and provide references for the design and research of bridges of such type, a suspension bridge with hybrid girder was taken as the study background. The finite element soft- ware was used to simulate the construction process of the steel-concrete joint section of the bridge and analyze the stress distribution trait and law of changes of the part in different construction stages. Meanwhile, the finite element model of the joint section of the edge main girder was es- tablished to study the load bearing capacity of the shear studs in the steel-concrete joint section as well as the load transferring path and ratio of different parts of the joint section. The results of the analysis indicate that the stress in the steel structure and concrete of the joint section of the bridge basically agrees with the code requirements. Greater tensile stress only occurs in a minor area of local part of the concrete and corresponding treating measures should be taken to optimize the structure. The maximum load bearing capacity of the shear studs in the joint section is 59.3 kN, less than the limit value in the codes, which indicates that the static load hearing capacity of the shear studs does not dictate the design of the joint section.