不锈钢焊接工字形截面短柱轴压局部稳定性能试验研究

发布时间：2018-01-18 06:41

本文关键词：不锈钢焊接工字形截面短柱轴压局部稳定性能试验研究　出处：《建筑结构学报》2015年05期 　论文类型：期刊论文

【摘要】：对奥氏体型S30408和双相型S22253两种牌号的15个不锈钢焊接工字形截面短柱开展轴压局部稳定试验研究,考察截面组成板件的局部稳定性能和截面承载力,得出了试件截面的应力-应变关系曲线。研究结果表明:厚实截面的试件承载力高于其截面屈服荷载,试件截面应力-应变关系曲线表现出典型的非线性特性和应变硬化特征;而宽肢薄壁截面的组成板件发生过早的局部屈曲,使得试件承载力不能达到截面的屈服荷载,需要对截面强度进行折减。基于得出的试验结果和现有的其他试验数据,对现有设计方法,包括欧洲规范EN 1993-1-4和美国规范SEI/ASCE 8-02中的有效宽度法以及直接强度法计算得出的截面承载力进行评估,表明根据欧洲规范EN 1993-1-4和直接强度法计算得到的截面承载力偏于保守,而美国规范SEI/ASCE 8-02对宽厚比较大的截面承载力计算偏于不安全,而且计算离散性较大。
[Abstract]:The welding of 15 stainless steel to austenitic S30408 and bipolar two types of S22253 I-section columns in axial compression test on local buckling bearing capacity, local stability and cross section investigation section component plates, the test curve of cross-section stress-strain relationship. The research results show that the thick the cross section of the bearing capacity of specimens is higher than that of the cross section of the specimen section yield load, the stress-strain curves exhibit nonlinear characteristic and strain hardening characteristics of typical components; and the plate width thin wall section happened premature local buckling, the specimen bearing capacity can not meet the need of the section yield load, section strength reduction. The test results and other available test data based on the existing design methods, including the European standard EN 1993-1-4 and SEI/ASCE 8-02 in the United States regulate the effective width method and direct strength method Evaluate the bearing capacity of cross section is calculated, according to the European standard EN 1993-1-4 shows that cross section and direct strength method calculated the bearing capacity on the conservative side, and the section of the American Standard SEI/ASCE 8-02 on heavy large capacity calculation is unsafe, and the calculation of a larger dispersion.

【作者单位】：武汉大学土木建筑工程学院;清华大学土木工程系;北京工业大学建筑工程学院;
【基金】：中国博士后科学基金项目(2014M560626) 湖北省自然科学基金项目(2014CFB715)
【分类号】：TU392.1
【正文快照】： 0引言不锈钢结构具有优良的抗腐蚀性能,但其材料的非线性特性会引起构件的稳定问题[1]。不锈钢材料具有可观的应变硬化能力,可以考虑利用板件的屈曲后强度,从而提高截面的利用效率。现有研究[2-3]表明,不锈钢构件截面的残余应力分布有别于普通钢结构构件,因此有必要对不锈钢构

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