Welded tubular joints for offshore structures are often subjected to a combination of axial and bending loads. Fabrication errors may introduce additional bending due to chord-brace misalignments. The combined effect of these loads and fabrication errors may produce chord brace weld toe stress distributions that are more severe under fatigue loading than the constituent single mode loading cases. Most of the earlier fatigue tests, conducted on tubular T-Joints with and without stiffeners, were subjected to either purely axial or bending loads, leading to different stress distributions along the weld toe in the chord section. From these studies it has been found that the initiation and coalescent fatigue lives were approximately the same. Breakthrough lives were quite different for these loading conditions of stiffened and unstiffened joints. It has been observed that there is a beneficial effect due to stiffener in increasing the load-carrying capacity by 3 times when compared to unstiffened joints. Combined loading can, in certain instances, produce a weld toe stress distribution that is relatively constant over more than 50% of the weld length, creating numerous potential sites for crack initiation. In this paper, the effect of combined (axial and bending) loading on a ring-stiffened tubular joint (which produces a more constant stress distribution) has been studied by conducting fatigue test.
Effect of stress distribution on fatigue behavior of stiffened tubular T-joints: Experimental investigation
International Journal of Offshore and Polar Engineering ; 9 , 3 ; 195-200
1999
6 Seiten, 10 Quellen
Article (Journal)
English
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