Shear resistance of aluminum alloy extruded H-Section beams

Shear resistance of aluminum alloy extruded H-Section beams
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铝合金挤压H型钢的抗剪性能

DOI:
10.1016/j.tws.2020.107219
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发表时间:
2020-11
影响因子:
6.4
通讯作者:
尹建
尹建
中科院分区:
工程技术2区
文献类型:
--
作者:
袁霖;张其林;罗晓群;欧阳元文;尹建

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对10根6061-T6铝合金挤压h型梁进行了剪切荷载试验。主要的设计变量是腹板的长细比、剪切长宽比和端柱条件。当试件长径比为1.0时,试件的破坏模式以剪切为主,当试件长径比大于1.0时,试件的破坏模式以弯曲为主。建立了有限元模型,并通过试验结果进行了验证。在此基础上,对铝合金h型钢进行了参数化研究,建立了广泛的受剪切作用下的数值数据库。随后,根据欧洲规范9和AISI S100和AS/NZS 4600中的直接强度法(DSM),将获得的试验和数值结果与其他可用数据进行了比较。一般来说,EC 9提供了比DSM公式更准确的结果,但在腹板的塑性剪切屈曲和相对柔性的法兰受到相当大的弯矩的情况下,也可以获得不安全的极限剪切荷载预测。DSM可以提供相当保守的预测,因为端柱的刚度和法兰刚度对弯曲和剪切相互作用的影响没有明确考虑。
A total of ten 6061-T6 aluminum alloy extruded H-section beams were tested under shear load. The primary design variables were the web slenderness, the shear aspect ratios and the end post conditions. A shear dominant failure mode was observed in specimens with the aspect ratio of 1.0 and a bending failure mode was observed in specimens with larger aspect ratios. Finite element models were developed and verified by the test results. Then a parametric study was carried out to generate an extensive numerical data pool on aluminum alloy H-section beams loaded in shear. The obtained test and numerical results with other available data were subsequently compared with the predictions according to Eurocode 9 and the Direct Strength Method (DSM) in AISI S100 and AS/NZS 4600. In general, the EC 9 provides more accurate results than the DSM formulae, but unsafe ultimate shear load predictions could also be obtained in cases of plastic shear buckling of the web and the relatively flexible flanges subjected to a fairly large moment. The DSM could provide considerably conservative predictions, because the rigidity of end posts and the effect of the stiffness of flanges on the interaction of bending and shear are not considered explicitly.
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