边缘剪切载荷作用下翻边开孔板的极限强度

ULTIMATE STRENGTH OF FLANGED-PERFORATED PLATES UNDER EDGE SHEAR LOADING

开孔广泛应用在船舶和海洋结构,这些开孔主要用于检查,并且适合于管道布置和结构减重等其他用途。开孔的存在降低了结构的强度,因此在结构设计阶段开孔板受到高度重视。在这种情况下,造船厂常采用局部增强的办法使开孔板能够满足结构屈曲和极限强度要求,但对加强开孔板的定量评估工作稍显不足。为了减少结构强度的降低,翻边开孔常作为一种补强方法来实现结构屈曲和极限强度的增加,但目前没有针对具体开孔参数的标准方法或建议。通过一系列数值分析,研究了在边缘剪切载荷作用下圆形翻边开孔参数(开孔半径、翻边长度及角度)对不同厚度翻边开孔板屈曲和极限强度的影响。研究结果可以为实际结构的翻边开孔设计提供参考。

Cutouts are widely used in ships and offshore structures, which are used mainly for inspection, and they may be fitted for other purposes, such as passing pipes and reducing weight. In general, the existence of cutouts can reduce the structural strength, so the plates with cutouts(perforated plates) are given high importance at the structural design stage. In this regard, locally reinforced perforated plates are often used in shipyards to satisfy the structural buckling and ultimate strength requirements, but quantitative evaluations of the reinforced perforated plates have a little insufficient. To mitigate the reduction of the structural strength, flanged cutout has been adopted as a reinforcing method to achieve the structural buckling and ultimate strength increase, but no standard methodologies or recommendations are available for the cutout parameters of this stiffener. In this paper, a series of numerical studies were undertaken to analyze the buckling and ultimate strengths of different thickness flanged-perforated plates, for various cutout parameters(cutout radius, flanging length and flanging angle) under edge shear loading condition. The results can provide references for the design of flanged-cutouts in engineering.