Geometrical effect on the stress distribution along weld toe for tubular T- and K-joints under axial loading

Prediction of stress distribution along the intersection of tubular T-joints by a novel structural stress approach

“…Four non-dimensional geometric parameters a; b; c and s, which determine the stress distribution for tubular joints, are used to describe the tubular joint [25,26]. Numerical FE analysis was conducted for the SCF ZP calculation under different types of loading for the tubular T-joint.…”

Prediction of hot spot stress distribution for tubular K-joints under basic loadings

“…The effects of geometrical parameters on the stress distributions of tubular K -joints under balanced axial loadings were investigated by Shao [4] in details. Based on the research work by Shao [4], the effect of geometrical parameters on the stress distribution of tubular K -joints under balanced axial loadings can be generalized as follows:…”

“…As the locations of the hot spot stresses for a tubular joint under different basic loadings are not located at a fixed position, the hot spot stress of a tubular joint under combined loading can be located at any point along the chord/brace intersection. Even for a tubular joint subjected to a fixed basic loading, the location of the hot spot stress is still not fixed (Shao et al [3], Shao [4]). In this case, the accurate hot spot stress cannot be calculated easily from the reported SCF equations.…”

“…Thus, the accuracy of the parametric equations for estimating the stress distribution is not guaranteed when the thickness of the tube is large. Shao et al [3] and Shao [4] found such parametric equations are not reliable when the chord thickness ratio is smaller than 8. Herion et al [10] proposed that a solid element is the best element in modeling welded tubular joints through a comparison of the different element types used in the analysis of the SCFs.…”

Probabilistic analysis of stress intensity factor (SIF) and degree of bending (DoB) in axially loaded tubular K-joints of offshore structures

“…As far as the authors are aware, despite the considerable research work accomplished on the deterministic study of SCFs and SIFs in tubular joints (e.g. Bowness and Lee (1998), Lee et al (2005), Shao and Lie (2005) and Shao (2006) for SIFs; and Wordsworth and Smedley (1978), Efthymiou (1988), Hellier et al (1990), Morgan and Lee (1998a), Chang and Dover (1999), Shao (2007), Shao et al (2009), Lotfollahi-Yaghin andAhmadi (2010), Ahmadi et al (2011), Lotfollahi-Yaghin and, Ahmadi and Lotfollahi-Yaghin (2012), and Ahmadi et al (2013) for SCFs, among others), no comprehensive research has been carried out on the probability distribution of the DoB and geometric and crack shape factors in tubular joints. What has been used so far as the probability distribution of these parameters in the FM-based reliability analysis of offshore structures is mainly based on assumptions and limited observations, especially in terms of distribution parameters.…”