連続防撓パネルの圧壊強度の推定法 (第2報)

抄録

The authors presented a simplified method to estimate the ultimate strength of a continuous stiffened plate under uniaxial thrust in the 1 st report. In this method, a continuous stiffened plate is modelled as a double-span beam-column, and the influence of the interaction between adjacent spans and that of the interaction between panel and stiffener on the ultimate strength are taken into account. In the present report, the influence of welding residual stresses produced by the fillet welding along panel/web intersection and/or web/flange intersection is further considered to apply the proposed method to a real welded structure. As for the stiffened plate with flat-bar stiffener, the effective thickness of stiffener is modified to consider the panel/stiffener interactions more correctly. The ultimate strengths estimated by the improved method are compared with the results of elastoplastic large deflection FEM analyses and those of the existing collapse tests for continuous stiffened plates. The comparison with the existing design formula and other estimation method is also carried out. It has been found that the present method can estimate the ultimate strength which is in better agreement with the results of FEM and tested results than the existing methods.