板構造物に対する座屈評価手法の基礎検討

抄録

In this paper, we have proposed a simple buckling evaluation method for plate structures of which original shapes and boundary conditions do not change before buckling, and buckling modes of the plates are uniform along longitudinal directions of the plates. Buckling forces of the plates in the structures are derived from the product of the Euler buckling forces and buckling coefficients of the plates. For the establishment of a relationship between the buckling coefficient and support stiffness of plates elastically supported by adjoining plates, buckling analyses by FE models were executed under conditions of different support stiffness for the adjoining plates, and then an approximate function between the support stiffness and the buckling coefficient was derived. This function was applied to examples with another moment ratio, a plurality of adjoining plates and asymmetric adjoining plates, and the buckling coefficients predicted by the function. It was then found that the buckling coefficients obtained by the proposed method matched those of the buckling analysis results. Furthermore, this buckling evaluation method was applied to plate structures, and a buckling force of a buckling plate was compared with a buckling analysis result. It was found that the buckling force could be evaluated within a difference of 6.8 %.