Characteristics of Stiffness and Strength of V-Joint in Tubular Offshore Structures(Mechanics, Strength & Structural Design)

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In this study, simple (unstiffened) V-joint of tubular offshore structures for oil exploitation is investigated as one of three-dimensional joints, of which two braces exist in a plane perpendicular to the axis of the chord. The mechanical behaviors under various loads (normal force and bending moments) are analyzed by PNM (Plastic Node Method) which is one of very efficient and accurate methods for elasticplastic analysis. Based on the results, the characteristics of the stiffness and strength of the V-joint are made clear, comparing with those of the T-joint which has the same dimensions. The elastic-plastic behavior is dependent on the loading condition, and the mechanism of influence upon the stiffness and strength is clarified. One of the most important results from this study is that the stiffness and strength of V-joint is reduced to 70% of those of T-joint in a severe loading condition. So the reinforcing method by using a stiffener is discussed.
大阪大学の論文