实验技术与管理2025，Vol.42Issue(3)：18-27,10.DOI:10.16791/j.cnki.sjg.2025.03.003
高速铁路槽型钢箱组合梁斜拉桥空间受力特性模型试验
Model test for the spatial stress characteristics of cable-stayed bridges with troughed steel box composite girders for high-speed railways
摘要
Abstract
[Objective]To strengthen the student's understanding of the spatial stress characteristics of composite girder cable-stayed bridges for high-speed railways,the spatial stress distribution of composite girders under different load conditions was studied by making test models.Additionally,key sections were integrated to further explore the force transmission characteristics of vertical shear and axial force in each component of a steel box girder.Model tests give students an intuitive demonstration of construction processes,system transformations,and the structural stress characteristics of cross-sea bridges.They also enhance the integration of theory and practice,stimulate interest in scientific research,foster innovative thinking and teamwork,and provide an innovative test platform for students to master the design and parameter optimization of mixed-girder cable-stayed bridges for high-speed railways.This test further cultivates their comprehensive innovation abilities.[Methods]In this paper,using the Quanzhou-Bay cross-sea bridge at the Fuzhou-Xiamen high-speed railway,a negative moment zone test model based on construction processes is designed to simulate the construction evolution and bridge status of the key process of bridge construction.The test model,along with the analysis of the stress distribution under different working conditions and a finite element model of the original bridge,provides insights into the force transmission characteristics and load distribution of the troughed steel box girder.[Results]Under different working conditions,the roof of the troughed steel box girder is in a tension state,and its maximum longitudinal stress first increases and then decreases.Furthermore,the longitudinal stress value is basically consistent with the first principal stress value σ1.Under different working conditions,the upper edge of the lower middle web is in a tension state,and the lower edge is in a compression state.Longitudinal stress on the tension side of the middle web is in good agreement with the maximum principal stress σ1,and longitudinal stress on the compression side corresponds well with the minimum principal stress σ2.Meanwhile,the shear force proportion of the middle web is about 54.29%,while that of the side web is about 37.11%.Under different working conditions,the bottom plate of the steel box girder is under pressure.The proportion of axial force borne by the troughed steel box girder bottom plate is about 69.9%of the total axial force,while that carried by the central web plate is about 17.39%of the total axial force.[Conclusions]The main stress direction of the roof and web of the troughed steel box girder is longitudinal,and the stress value is less than the allowable stress limits specified in the norm.The structure design of the troughed steel box girder is reasonable,safe,and reliable,and the stress distribution across each section is consistent with theoretical calculations.Under the most unfavorable load conditions,the steel box girder web is the main force-bearing component for vertical shear,while the steel box girder bottom plate is the main force-bearing component for axial force,therefore,the web and bottom plate are the focus of design analysis.关键词
高速铁路/组合梁斜拉桥/模型试验/应力分布/创新能力Key words
high-speed railway/composite girder cable-stayed bridge/model test/stress distribution/innovation ability分类
交通工程引用本文复制引用
谢明志,蒋志鹏,黄胜前,曾甲华,杨灯,杨永清..高速铁路槽型钢箱组合梁斜拉桥空间受力特性模型试验[J].实验技术与管理,2025,42(3):18-27,10.基金项目
国家自然科学基金资助项目(52322811) （52322811）
中国国家铁路集团有限公司科技研究计划重大课题(K2018G017) （K2018G017）
中国铁建科技研究开发计划(16-C53) （16-C53）
西南交通大学2024年高水平育人课程教学改革项目(2024-18,2024-122) （2024-18,2024-122）
