ABSTRACT

The U-type stiffener is widely used in hatch cover design for cargo holds due to its easier fabrication, maintenance and painting. However, its ultimate strength evaluation method under axial compression is still unclear. The existing formula for ultimate strength evaluation of stiffened panel is not applicable to U-type stiffened panels of hatch cover with thinner deck plate, wider plate breadth between stiffeners, and longer stiffener span. This paper is to find an accurate method for evaluating ultimate strength of U-type stiffened panel for hatch cover. Based on extensive non-linear FE results, a simple formula is proposed to evaluate the ultimate strength of the U-type stiffened panel under axial compression, which is well in agreement with the FE results and 30 model test results. At last, it is proved that the U-type structure will have a great influence on the lightweight design of hatch cover.

摘要

U型加强筋由于易于制造，维护和涂漆而被广泛用于货舱的舱口盖设计。然而，其在轴向压缩下的极限强度评估方法仍不清楚。现有的用于加劲板极限强度评估的公式不适用于舱口盖的U型加劲板，因为该舱口盖的盖板较薄，加劲肋之间的板宽度较宽且加劲肋跨度较长。本文旨在找到一种准确的方法来评估舱口盖的U型加劲板的极限强度。基于广泛的非线性有限元分析结果，提出了一个简单的公式来评估U型加劲板在轴向压缩下的极限强度，这与有限元结果和30个模型测试结果非常吻合。最后，