PROBLEM TO BE SOLVED: To make the safety design and buckling analysis working for the buckling of a structure efficient by effectively utilizing an analysis method using a decrease stiffness method.;SOLUTION: A linear buckling analysis is performed by a computer up to an order where the whole linear buckling load PL of the structure becomes 1.5 times as large as a primary PL at the largest, the lower limit PL* of the whole buckling load of the structure is next calculated with the decrease stiffness method by using the computer, all primary buckling modes are selected among all orders in which the calculation is performed, the existence/absence of an order buckling mode in which the PL* is smaller than the primary PL* is decided, when the smaller order buckling mode exists, adoption is selected, an order buckling mode that is subjected to shape similarity to deformation shape due to the whole linear stress analysis of the structure is also selected and set as initial imperfections corresponding only to the selected order buckling mode, and nonlinear buckling analysis is carried out.;COPYRIGHT: (C)2002,JPO
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