Hamid Ahmadi and Shadi Asoodeh
Degree of Bending in Axially Loaded Tubular KTJoints of Offshore Structures Parametric Study and Formulation
707 - 716
2015
9
6
International Journal of Civil and Environmental Engineering
https://publications.waset.org/pdf/10001611
https://publications.waset.org/vol/102
World Academy of Science, Engineering and Technology
The fatigue life of tubular joints commonly found in
offshore industry is not only dependent on the value of hotspot stress
(HSS), but is also significantly influenced by the throughthethickness
stress distribution characterized by the degree of bending
(DoB). The determination of DoB values in a tubular joint is essential
for improving the accuracy of fatigue life estimation using the stresslife
(S–N) method and particularly for predicting the fatigue crack
growth based on the fracture mechanics (FM) approach. In the
present paper, data extracted from finite element (FE) analyses of
tubular KTjoints, verified against experimental data and parametric
equations, was used to investigate the effects of geometrical
parameters on DoB values at the crown 0°, saddle, and crown 180°
positions along the weld toe of central brace in tubular KTjoints
subjected to axial loading. Parametric study was followed by a set of
nonlinear regression analyses to derive DoB parametric formulas for
the fatigue analysis of KTjoints under axial loads. The tubular KTjoint
is a quite common joint type found in steel offshore structures.
However, despite the crucial role of the DoB in evaluating the fatigue
performance of tubular joints, this paper is the first attempt to study
and formulate the DoB values in KTjoints.
Open Science Index 102, 2015