拉压不同模量连续箱梁弯曲性能分析  

Analysis of Bending Performance of Continuous Box Girder with Different Modulus of Tension and Compression

作　　者：李斌[1] 尹萱洋 周欣珩 LI Bin;YIN Xuanyang;ZHOU Xinheng(School of Civil Engineering and Architecture,Hunan Institute of Science and Technology,Yueyang 414006,China)

机构地区：[1]湖南理工学院土木建筑工程学院,湖南岳阳414006

出　　处：《湖南理工学院学报(自然科学版)》2025年第1期28-36,共9页Journal of Hunan Institute of Science and Technology(Natural Sciences)

基　　金：国家自然科学基金项目(51378080);全国大学生创新创业项目(S202412658012)。

摘　　要：连续箱梁具有良好的结构性能,在桥梁建设中获得广泛的应用.目前对箱梁抗弯性能的研究主要基于拉压弹性模量相同理论,这与材料在受拉和受压的力学状态下分别呈现出不同弹性性质的实际不符,得到的内力及应力应变等结果必然存在偏差.基于拉压不同模量理论,充分考虑材料拉压弹性模量不同所导致的中性层位置、受压区高度以及反弯点位置改变等的影响,采用传递矩阵法对连续箱梁的应力、应变、挠度等进行分析.计算结果表明,简支箱梁和连续箱梁的中性轴位置、应力、位移均随材料拉压弹性模量比的变化而变化.Continuous box girders have excellent structural performance and are widely used in bridge construction.At present,the research on the flexural performance of continuous box girders is mainly based on the theory of the same elastic modulus for tension and compression,which does not conform to the actual situation that materials show different elastic properties the mechanical state of tension and compression,and the results obtained,such as internal force and stress strain,are bound to have deviations.In this paper,based on the theory of different tension and compression elastic modulus,the effects of the change of neutral layer position,the height of the compressed area and the position of the inflection caused by the different tension and compression elastic modulus of materials are fully considered,and the stress,strain and deflection of continuous box girders are analyzed by the transfer matrix method.The calculation results show that the neutral axis position,stress,and displacement of both simply supported box girders and continuous box girders vary with changes in the ratio of tensile to compressive elastic modulus of the material.

关 键 词：拉压不同模量 连续箱梁 传递矩阵法 弯曲性能 

分 类 号：U441[建筑科学—桥梁与隧道工程] O342[交通运输工程—道路与铁道工程]