高强度钢材焊接圆钢管轴心受压整体稳定性能研究

发布时间：2018-02-28 01:33

本文关键词： 高强度钢材焊接圆钢管残余应力轴心受压整体稳定设计方法　出处：《北京交通大学》2013年硕士论文　论文类型：学位论文

【摘要】：随着冶金工艺和钢结构加工制造技术的不断提高,高强度钢材钢结构的工程实践日益增多,世界各地已有很多大型建筑和桥梁结构采用了高强度钢材。高强度钢材焊接圆钢管主要应用在桁架、网架、网壳以及输电铁塔等结构形式中,能够充分发挥圆钢管的受力性能优势。有关高强度焊接圆钢管受力性能的研究尚处于起步阶段,尤其缺乏高强度焊接圆钢管轴心受压构件的残余应力分布、整体稳定性能等方面的研究成果,无法保证相关工程设计的合理性和可靠性。本文介绍了高强度钢材焊接圆钢管的工程应用及其轴压构件稳定性能的研究现状,并总结了国内外规范关于此类构件的轴心受压稳定设计方法。为全面研究高强度焊接圆钢管轴压构件的整体稳定受力性能,本文首先针对9个焊接圆钢管试件(包括6种截面尺寸、2种钢材强度、2种焊接方式以及2种表面处理方式)进行了残余应力试验研究,得到了不同焊接圆钢管试件沿全截面分布的纵向残余应力数值大小,并基于大量的测量原始数据,提出了焊接圆钢管截面残余应力的分布模型及计算公式,为构件整体稳定性能的研究提供依据；其次,针对24个Q420高强度钢材埋弧焊接圆钢管柱进行了轴心受压试验研究,基于试验结果分析了其失稳变形特征,比较了试件整体稳定系数试验值与国内外规范柱子曲线计算值的关系；再次,本文运用通用有限元软件ANSYS建立了能够考虑几何初始缺陷及截面残余应力影响的三维有限元模型,对所有试件的整体稳定受力性能进行了有限元分析,并通过与试验结果的对比,验证了有限元模型的准确性和可靠性；最后,采用验证后的有限元模型计算了480个高强度焊接圆钢管轴压构件的整体稳定系数,并通过与国内外规范柱子曲线计算值的对比,建议了不同等级高强度钢材焊接圆钢管轴压构件柱子曲线类别的选取,同时分别提出了不同强度等级钢材焊接圆钢管轴心受压构件整体稳定性能的设计方法,并在此基础上最终提出了一条适用于高强度钢材焊接圆钢管的柱子曲线。
[Abstract]:With the continuous improvement of metallurgical technology and manufacturing technology of steel structure, the engineering practice of high strength steel structure is increasing day by day. Many large buildings and bridge structures around the world have adopted high strength steel. High strength steel welded circular steel pipes are mainly used in trusses, grid frames, grid shells and transmission towers. The research on the mechanical behavior of high strength welded circular steel pipe is still in its infancy, especially in the absence of residual stress distribution of the axial compression member of high strength welded circular steel pipe. The research results of overall stability performance can not guarantee the rationality and reliability of related engineering design. This paper introduces the engineering application of high strength steel welded circular steel pipe and the research status of the stability of axial compression members. The design methods of axial compression stability of this kind of members are summarized in the domestic and foreign codes. In order to study the overall stability behavior of high strength welded circular steel tube under axial compression, In this paper, the residual stress of 9 welded circular steel tube specimens (including 6 kinds of section sizes, 2 kinds of steel strength welding methods and 2 kinds of surface treatment methods) has been studied. The longitudinal residual stress values of different welded circular steel tube specimens distributed along the full section are obtained. Based on a large number of measurement data, the distribution model and calculation formula of residual stress in welded circular steel tube section are proposed. Secondly, the axial compression tests of 24 Q420 high strength steel submerged arc welded circular steel pipe columns are carried out, and the characteristics of instability deformation are analyzed based on the test results. The relationship between the test value of the whole stability coefficient of the specimen and the calculated value of the column curve of the code at home and abroad is compared. Thirdly, a three-dimensional finite element model which can take into account the influence of the initial geometric defect and the residual stress of the section is established by using the universal finite element software ANSYS. Finite element analysis is carried out on the whole stability of all the specimens, and the accuracy and reliability of the finite element model are verified by comparing with the experimental results. The overall stability factors of 480 high strength welded circular steel tube members under axial compression are calculated by using the verified finite element model, and the calculated values are compared with the calculated values of the column curves of the codes at home and abroad. The selection of column type of axial compression member of welded circular steel tube with different grades of high strength steel is suggested. At the same time, the design method of overall stability of axial compression member of welded circular steel tube with different strength grade is put forward. Finally, a column curve suitable for high strength steel welded circular steel pipe is proposed.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU392.3

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