有孔板の座屈強度について(その3)

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In this paper, instability of stiffened plate with a circular hole is studied by using the finite element technique, in order to clarify the effect fo stiffeners on the buckling strength of pierced girder web of large ships.In this calculation, the triangular plate elements are used and stiffeners are treated as beam elements.The bending stiffiness matrix and the initial stress matrix of both elements are formulated from equations (3) to (21).To verify the calculation, stiffened square plates (shown in Fig.1) are tested in compression.All edges are simply supported.The buckling loads are determined experimentally by using the P-δ^2 method or the ε-δ^2 method (Fig.3a).The caluclated values and experimental ones are shown in Fig.9 and Fig.10. The conclusions obtained are as follows : (1) The effect of stiffeners on the buckling strength of plates with a hole is remarkable (See Fig.15). Even the local stiffening around a hole is effective for raising the critical stress.(2) It is noted in these tests that the longer the stiffener length becomes, the higher the critical stress is obtained, that is, the plate P-5 stiffened by single and long stiffener shows the higher the critical stress than that of P-3 stiffened by two but shorter stiffeners.(3) However, the local stiffeneing around the hole does not work for raising the maximum load (See Fig.2).(4) The finite element technique employed in this paper gives a good solution for the buckiling problem of stiffened plates with a hole.
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有孔板の座屈強度について(その3)

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