圧縮および引張荷重を受ける構造要素の変形挙動 : 第2報 : 繰返し荷重を受けるパイプの変形挙動

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In order to know the behavior of deformation and fatigue strength of structural members under compressive and tensile loads, theoretical and experimental investigations were performed on a column with rectangular cross section in the first report. In this paper, the problem of thin tubular columns which are usually used for bracing in offshore structures subjected to periodic forces by waves and winds is studied. The following items are studied, 1) the gloval buckling strength of column 2) the post-buckling behavior 3) the local buckling behavior occured at the compressive side of wall in the cross section at midlength 4) the initiation mechanism of fatigue crack during repeated loads 5) the fatigue strength at the hot-spot. The following conclusions are made. l) It is confirmed that not only the buckling and postbuckling behavior of deformation due to compressive loads but also the cyclic behavior of a column under repeated loads are easily calculated by the analytical method proposed in this paper. And the analytical results agree well with the experimental ones. 2) Definition of the critical strain at which the local buckling occurs in a pipe under combined loads of compresion and bending moment is made clear. The local buckling strain obtained by experiments shows good agreement with that by analysis. 3) The initiation mechanism of fatigue crack can be explained through the change of load P, ovalization of cross section and local strain at the hot spot during repeated load. 4) A design proposal for the fatigue strength is made by using the above-mentioned local buckling strain.
社団法人日本船舶海洋工学会の論文

圧縮および引張荷重を受ける構造要素の変形挙動 : 第2報 : 繰返し荷重を受けるパイプの変形挙動

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