为研究均匀外压下，螺旋加筋圆柱壳的屈曲特性，制作2组螺旋加筋圆柱壳和不加筋圆柱壳，并对其开展几何测量和静水压力测试。其次，基于实测初始几何缺陷，对螺旋加筋圆柱壳和圆柱壳开展非线性数值分析，数值分析与试验结果具有良好一致性。最后，研究圆柱壳长度与肋骨螺距之比（长度螺距比）、肋骨截面类型对螺旋加筋圆柱壳屈曲载荷的影响规律。结果表明，螺旋加筋可使圆柱壳获得52.6%的极限载荷增益；随着长度螺距比增大，螺旋加筋圆柱壳的屈曲载荷也随之增大，但受缺陷幅值的影响也变大；L型截面的螺旋肋骨相较于矩形截面和工字型截面，屈曲载荷提升效果最优，最大提升14.6%。
In order to investigate the buckling behavior of helically stiffened cylindrical shells under uniform external pressure, two sets of helically stiffened cylindrical shells and unstiffened cylindrical shells were fabricated, geometrically measured, and hydrostatically tested. Secondly, based on the measured initial geometric imperfections, nonlinear numerical analyses were carried out for the samples. The numerical analyses were in good agreement with the experimental results. Finally, the effects of the ratio of the length of the cylindrical shell to the pitch of the rib (length-to-pitch ratio) and the cross-sectional type of the rib on the buckling load of the helically stiffened cylindrical shell were studied. The results indicate that helically stiffened can achieve a 52.6% ultimate load gain for cylindrical shell. The buckling load of helically stiffened cylindrical shell increases with the increase of length-to-pitch ratio, but it is greatly affected by the amplitude of imperfections. Compared with the rectangular section and I-shaped section, the helical rib with L-shaped section has the best buckling load improvement effect, with a maximum increase of 14.6%.
2024,46(12): 39-45 收稿日期：2023-08-25
DOI：10.3404/j.issn.1672-7649.2024.12.007
分类号：U661.43
基金项目：国家自然科学基金面上项目（52171258）
作者简介：王晓勇(1999-),男,硕士,研究方向为深海耐压结构设计与制造
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