孙立鹏, 刘永健, 张宁, 卢迅. 单侧约束三边支承高强钢板的局部屈曲性能[J]. 工程力学, 2021, 38(7): 19-29. DOI: 10.6052/j.issn.1000-4750.2020.06.0407
引用本文: 孙立鹏, 刘永健, 张宁, 卢迅. 单侧约束三边支承高强钢板的局部屈曲性能[J]. 工程力学, 2021, 38(7): 19-29. DOI: 10.6052/j.issn.1000-4750.2020.06.0407
SUN Li-peng, LIU Yong-jian, ZHANG Ning, LU Xun. LOCAL BUCKLING BEHAVIOR OF HIGH STRENGTH STEEL PLATE WITH UNILATERAL RESTRAINT AND TRILATERAL SUPPORT[J]. Engineering Mechanics, 2021, 38(7): 19-29. DOI: 10.6052/j.issn.1000-4750.2020.06.0407
Citation: SUN Li-peng, LIU Yong-jian, ZHANG Ning, LU Xun. LOCAL BUCKLING BEHAVIOR OF HIGH STRENGTH STEEL PLATE WITH UNILATERAL RESTRAINT AND TRILATERAL SUPPORT[J]. Engineering Mechanics, 2021, 38(7): 19-29. DOI: 10.6052/j.issn.1000-4750.2020.06.0407

单侧约束三边支承高强钢板的局部屈曲性能

LOCAL BUCKLING BEHAVIOR OF HIGH STRENGTH STEEL PLATE WITH UNILATERAL RESTRAINT AND TRILATERAL SUPPORT

  • 摘要: 部分包裹组合柱的翼缘板可归类为三边固支、一边自由,并在面外受混凝土单侧约束的平板。此类板件的局部屈曲可通过限制板件的宽厚比来避免。为了得到此类高强钢板的宽厚比限值,该文以薄板的弹塑性局部屈曲理论为基础,采用Bleich近似计算方法,结合Ramberg-Osgood高强钢材本构模型,推导出了板件在均布压应力作用下的弹塑性屈曲应力,给出了板件宽厚比限值的近似计算公式。采用有限元法进行了高强钢部分包裹组合柱轴压数值试验,有限元结果与已有的试验结果验证了该文提出的宽厚比限值近似计算公式的准确性。与相关规范的对比分析表明:混凝土的单侧约束作用可以使三边支承高强钢板的宽厚比限值提高39%;该文近似计算公式所得的受混凝土单侧约束、三边固支、一边自由高强钢板的宽厚比限值比澳大利亚规范AS/NZS 2327:2017的计算结果小19%,与欧洲规范EN 1994-1-1的计算结果仅相差5%。建议受混凝土单侧约束、三边固支、一边自由高强钢板的宽厚比限值可偏安全地取该文近似计算公式和EN 1994-1-1计算结果的较小值。

     

    Abstract: Partially encased composite (PEC) column flanges can be classified as a flat plate fixed on three sides, free on the other side, and restrained by concrete on one side outside the plane. The local buckling of this kind of plates can be avoided by limiting the width-to-thickness ratio. To obtain the width-to-thickness ratio limit of such high-strength steel plate, the elastic-plastic buckling stress of plate under uniform compressive stress is derived by using Bleich approximate calculation method, and the approximate solution of width-to-thickness ratio limits are obtained, based on the elastic-plastic local buckling theory of a thin plate, combined with Ramberg-Osgood constitutive model of high-strength steel. Furthermore, the numerical tests of axial compression of PEC columns with high-strength steel are carried out by the finite element method. The accuracy of the approximate solution of the width-to-thickness ratio limits proposed is verified by the finite element results and by the existing experimental results. The comparison with the relevant codes shows that: the unilateral restraint action of concrete can increase the width-to-thickness ratio limits of the high-strength steel plate supported on three sides by 39%; the width-to-thickness ratio limits of high-strength steel plate with unilateral restraint fixed on three sides free on one side calculated by the approximate formula proposed is 19% smaller than that of the Australian code AS/NZS2327: 2017 and only 5% less than that of the European code EN 1994-1-1. It is suggested that the width-to-thickness ratio limits of a high-strength steel plate with unilateral restraint fixed on three sides free on one side can be safely taken as the smaller value of the calculation results of the approximate formula proposed and the calculation result of EN 1994-1-1.

     

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