POSTBUCKLING ANALYSIS OF RECTANGULAR PANELS WITH FLANGES BEHAVING ELASTO-PLASTICALLY
POSTBUCKLING ANALYSIS OF RECTANGULAR PANELS WITH FLANGES BEHAVING ELASTO-PLASTICALLY
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带法兰弹塑性行为的矩形板的后屈曲分析
DOI：
10.2208/jscej1969.1973.220_117
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发表时间：
1973
期刊：
影响因子：
--
通讯作者：
E. Watanabe
中科院分区：
文献类型：
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作者：
E. Watanabe
随着工程技术、高强度钢和钢结构制造的进步，钢结构的设计和制造越来越薄，越来越灵活。不断发生的此类结构事故和倒塌，使世界各国的工程师重新考虑结构的极限强度，并要求建立更精确的设计规范。墙结构是由腹板、翼缘和加劲肋组成的板梁。由于参数荷载和缺陷的性质，即使对板梁板的性能进行精确的研究，也会揭示出复杂的和相当随机的性能。本文讨论了摄动法在考虑腹板大挠度引起的应力重分布和各种刚度变化以及翼缘弹塑性特性时的应用。重点研究了翼缘残余应力对主梁承载力的影响，采用有限差分法进行了数值计算，考虑了多种边界条件，求解了未知位移，并与其他机构的试验结果进行了比较，结果表明，翼缘残余应力对主梁承载力的影响是显著的。结果表明，翼缘存在较大的残余应力对板梁的承载能力是不利的，并且屈曲后的性能会因板的不同性能而有很大的不同。
With the advance of engineering know-how, high strength steel, and the fabrication of steel structures, there has been a tendency of steel structures being designed and fabricated thinner and more flexible.However, incessant accidents and collapses of such structures have made the engineers of the world reconsider the ultimate strength of the structures and called for establishing more accurate design codes.One of the simplest thin-walled structures would be a plate girder that consists of a webplate, flanges, and stiffeners.Even a precise investigation on the behavior of plate girder panels will reveal complicated and rather random performances due to the nature of the parametric loading and imperfections.In this paper, an application of perturbation method is discussed to take into account the stress redistribution and the change of various rigidities due to the large deflection of webplates and the elasto-plastic behavior of flanges. Special attention is paid on the effect of residual stress of flanges upon the load carrying capacity of girders.The numerical computation was performed by means of finite differences to take into account many boundary conditions solving for unknown displacements.The analytical results were compared with those from the experiments conducted at other institutions.As a result of the analysis, it was found that the existence of large residual stress of flanges is not desirable for the load carrying capacity of plate girders, and that the postbuckling performance may significantly differ depending on the individual properties of the panels.