Stress concentrations in tubular gap K-joints: mechanics and fatigue design

Comparison of fatigue performances of gapped and partially overlapped CHS -joints

“…For the calculation of SCF for gapped CHS K -joints, different forms of SCF equations were suggested in the past few decades by Kuang et al [18], Wordsworth and Smedley [19,20], Efthymiou and Durkin [8], Smedley and Fisher [21], Karamanos et al [22] and Zhao et al [2]. In this study, the SCF equations suggested by Smedley and Fisher [21] were employed.…”

“…These equations, which are commonly referred to as the DEn SCF equations, as they were developed in a research project sponsored by the UK Department of Energy, were selected as it was found that they are more accurate than those equations suggested by Kuang et al [18], Wordsworth and Smedley [19,20] as well as Efthymiou and Durkin [8]. Furthermore, those equations suggested by Karamanos et al [22] and Zhao et al [2] are, in fact, simplified and shortened forms of the DEn equations. In addition, results obtained from Schumacher [23,24] concluded that those equations suggested by Karamanos et al [22] were on the conservative side for joints with γ values equal to 12.…”

“…Furthermore, those equations suggested by Karamanos et al [22] and Zhao et al [2] are, in fact, simplified and shortened forms of the DEn equations. In addition, results obtained from Schumacher [23,24] concluded that those equations suggested by Karamanos et al [22] were on the conservative side for joints with γ values equal to 12. The DEn SCF equations for gapped CHS K -joints with identical braces are listed in Tables 2a and 2b.…”

Stress concentration factors and fatigue behavior of square bird-beak SHS T-joints under out-of-plane bending

“…Cheng et al [16] carried out tests to obtain stress concentration factors of square bird-beak T-joints under chord and brace axial forces. Compared with abundant products for fatigue of conventional CHS and SHS steel connections that have been presented in literature [17][18][19][20][21][22][23][24][25][26][27] and with detailed provisions in current design codes such as IIW Fatigue Design Recommendation [28] and CIDECT Design Guide No. 8 [29], existing fatigue studies of bird-beak SHS joints are far from systematic and complete.…”

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

“…In the literature, many research works have been focused on the computation of the stress concentration factors of tubular joints with different types. The studied joint types include T-joints [1][2][3][4], tubular K-joints [5][6][7] and other complex tubular joints [8][9][10][11]. The stress concentration factor in the welded region can be determined easily from some parametric equations in these studies.…”