Pages 99-106
Web panels of girders and floors in a ship structure have many openings for piping and passing. These openings reduce the buckling strength of panels in most cases, and it is very important to estimate the influence of openings on the buckling strength of panels. From this point of view, a series of eigenvalue analyses were performed to evaluate the elastic buckling strength of perforated panels. The influence of adjacent panels without opening was also examined. It has been found that : (1)The regions with high stress and low stress are produced because of stress concentration due to opening. When buckling deflection takes place at a high stress region, buckling strength is reduced. On the other hand, it is increased when buckling deflection takes place at a low stress region. (2)When an opening in a web of a girder with horizontal stiffeners is large, high stress region is produced in the adjacent panels without opening. In this case, the buckling of adjacent panels dominates the buckling strength of the web as a whole. (3)In some cases, rule formulae of classification societies give relatively low elastic buckling strength for perforated plates compared to the results of FEM analyses.
