钢结构曲板极限承载力及曲率影响研究

发布时间：2018-01-05 15:39

本文关键词：钢结构曲板极限承载力及曲率影响研究　出处：《铁道建筑》2017年01期 　论文类型：期刊论文

【摘要】：为得出圆柱曲板单元直边受压的稳定特征,以北京长安街西延线永定河特大桥钢曲塔为研究对象,通过足尺模型试验研究四边简支边界条件下曲板的极限承载力;同时在考虑材料和几何非线性的条件下,基于ANSYS软件对曲板试件的弹塑性屈曲进行数值分析,进一步得出曲率对极限承载力的影响。结果表明:曲板试件加载过程中,加载方向与垂直板面方向均产生明显变形,达到极限承载力时最大变形发生在靠近曲板中间位置且垂直板面的方向;曲板荷载-位移曲线数值结果与试验结果符合较好,极限承载力小于直板试件对应值;曲板尺寸不变的条件下,随着曲率增大,曲板极限承载力逐渐降低,且局部稳定折减系数与曲率呈线性关系。
[Abstract]:In order to obtain the stable characteristics of cylindrical straight edge compression plate unit, with steel choten Beijing Chang'an Avenue West extension line of Yongding River Bridge as the research object, through the limit of a full-scale experiment on the simply supported boundary conditions of curved plates bearing capacity; at the same time considering the material and geometric nonlinear under the condition of ANSYS software on the curved plate specimen the elastic-plastic buckling numerical analysis based on the effect of curvature on the ultimate bearing capacity. The results show that the curved plate specimen loading process, the loading direction and the vertical direction of surface deformation significantly, reaching the ultimate bearing capacity when the maximum deformation occurs near the middle position and the curved plate perpendicular to plane direction; curved plate the load displacement curves of numerical results agree well with the test results, the corresponding value is less than straight specimen ultimate bearing capacity; curved plate size under the same conditions as the curvature increases, the ultimate bearing capacity by curved plate The coefficient of local stability reduction is linearly dependent on the curvature, and the local stability reduction coefficient is linearly dependent on the curvature.

【作者单位】：中国铁道科学研究院铁道建筑研究所;高速铁路轨道技术国家重点实验室;北京市市政工程设计研究总院有限公司;
【基金】：中国铁路总公司科技研究开发计划(2015G002-A)
【分类号】：U448.27
【正文快照】： 曲板在钢桥、钢塔等建造中的应用越来越广泛[1-3]。但由于缺乏相关标准,曲板稳定设计目前面临较大困难。以往针对曲板稳定的研究多集中于圆柱曲板或圆柱壳的轴压[4-6]或侧压稳定问题[7-8],如图1(a)、图1(b)所示。Tran等[1]针对受轴压作用曲板开展一系列数值分析,研究轴压下曲

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