Abstract

Various types of curved steel plates are commonly used in aerospace, naval and bridge engineering. Either very thin plates are used in order to create lightweight structures or thicker plates in order to prevent stability problems. In the last decades, curved steel panels have been used along the bridge direction and on a cross-sectional level. A practical case is discussed and used to determine the model characteristics for an intensive numerical parameter study. Plates with different curvatures and thicknesses are investigated. Aspect ratios of one and two are considered, together with two sets of edge conditions. The edge conditions and material model are verified by experimental tests of flat plate girders. An imperfection sensitive study is performed in order to find the ultimate load of the curved plates. Two mode shapes are considered, categorized as stable and unstable. Results show that the geometric imperfection shape affects the load–deflection path, but not the ultimate load capacity, for slender curved plates. For plates with a higher curvature or lower slenderness ratio b/t, an unstable mode seems to have a disadvantageous influence on the ultimate load. Finally, a design method for curved plates with rigid vertical stiffeners is proposed.

摘要

各种类型的弯曲钢板通常用于航空航天，海军和桥梁工程。为了防止重量轻，要么使用非常薄的板来制造轻质结构，要么使用更厚的板。在过去的几十年中，沿着桥梁方向和横截面水平使用了弯曲的钢板。讨论了一个实际案例，并将其用于确定密集的数值参数研究的模型特征。研究了不同曲率和厚度的板。会考虑长宽比1和2，以及两组边缘条件。边缘条件和材料模型通过平板大梁的实验测试得到验证。为了找到弯曲板的极限载荷，进行了对缺陷的敏感性研究。考虑了两种模式形状，分为稳定和不稳定。结果表明，对于弯曲的细长板，几何缺陷形状会影响载荷-挠曲路径，但不会影响最终载荷能力。适用于曲率较高或细长率较低的印版b / t，不稳定模式似乎对极限载荷有不利影响。最后，提出了一种具有刚性竖向加劲肋的弯曲板的设计方法。