薄肉開断面曲線梁の弾塑性曲げ捩り解析

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In this paper, elasto-plastic, flexural-torsional analysis of curved beams subjected to thrusts and bending moments applied in the plane of initial curvature is carried out by using Galerkin method. This method provides not only continuous distributions of stresses and displacements but also substantial cut of computing time compared with FEM because the size of final simultaneous equations could be considerably reduced. The results of elastic analysis (1ateral buckling loads, deflections of beams) are in fairly good agreement with those of S. P. Timoshenko^<3)> and V. Z. Vlasov^<4)>. From the results of elastoplastic analysis, it is clarified that initial imperfections such as initial deflections and residual stresses due to welding result in considerable reduction of lateral-torsional buckling strength. The authors also suggest a simplified method to estimate elasto-plastic, lateral-torsional buckling load of curved beam with I-sections subjected to uniform bending.
社団法人日本船舶海洋工学会の論文