海洋结构薄板弹性屈曲的群孔效应

A computational investigation of the group effects of circular holes on the buckling strength of steel plates

针对含孔洞板结构,重点考虑非均匀孔洞分布,采用有限元方法对小变形结构的极限承载能力进行计算,得到孔洞数量、面积、位置、分布等因素对屈曲临界应力的影响规律。结果表明:孔洞分布不仅会改变有效承载面积并使承载能力变化,局部结构还会进入不同承载状态,使板结构承载性能产生非单调变化,即孔洞对板结构屈曲应力的影响具有一定的"群孔"效应。

The present study is focused on assessing the group effects of holes on the buckling strength of the marine structural plates of various slenderness with clamped edges and subjected to uniaxial compression. Different damage patterns are investigated. By the combination of several factors, including the number and distribution of holes, hundreds of FEA have been carried out. It is concluded that the damaged condition, defined as group effects of holes, not only affects the deformation state and the loading capacity of plate at the buckling mode, but also change the effective loading area and section.