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Web crippling of aluminium tubes with perforated webs

机译：带穿孔网的铝管的网瘫痪

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Experimental and numerical investigations of aluminium alloy square hollow sections with a circular hole in the webs subjected to web crippling are presented in this paper. A total of 216 data that include 84 test results and 132 numerical results are presented. The web crippling tests were conducted under two loading conditions of end-two-flange (ETF) and interior-two-flange (ITF). The test specimens were fabricated by extrusion using a 6061-T6 heat-treated aluminum alloy. The web holes were located at the mid-depth of the webs and centred beneath the bearing plates. A non-linear finite element model is developed and verified against the experimental results. Geometric and material non-linearities were included in the finite element model. It was shown that the finite element model closely predicted the web crippling strengths and the failure modes of the tested specimens. Hence, the model was used for an extensive parametric study of the different sizes of the cross-section and circular holes in the webs. The influence of the circular web holes on the web crippling strength of aluminium square hollow sections is investigated in this study. Web crippling strength reduction factor equations are proposed for the ETF and ITF loading conditions. It is shown that the proposed strength reduction factors are generally conservative and agree well with the experimental and numerical results. Furthermore, a unified web crippling equation for the aluminium square hollow sections with circular web holes is also proposed.
机译：本文介绍了腹板受压后腹板中带有圆孔的铝合金方形空心截面的实验和数值研究。总共提供216个数据，其中包括84个测试结果和132个数值结果。在两个端部两端法兰（ETF）和内部两个端法兰（ITF）的两种加载条件下进行了卷筒纸压接测试。使用6061-T6热处理铝合金通过挤压制造试样。腹板孔位于腹板的中间深度，并在轴承板下方居中。建立了非线性有限元模型，并针对实验结果进行了验证。几何和材料非线性包括在有限元模型中。结果表明，有限元模型可以精确预测卷材的抗压强度和试样的破坏模式。因此，该模型用于对腹板中横截面和圆形孔的不同尺寸进行广泛的参数研究。本研究研究了圆形腹板孔对方形铝空心腹板腹板抗折强度的影响。针对ETF和ITF加载条件，提出了Web断裂强度降低因子方程。结果表明，提出的强度折减系数总体上比较保守，与实验和数值结果吻合良好。此外，还提出了具有圆形腹板孔的铝方型空心截面的统一腹板瘫痪方程。

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