TY - JOUR
T1 - Stress concentration factors of cold-formed high strength steel tubular T-joints
AU - Pandey, Madhup
AU - Young, Ben
N1 - Funding Information:
The authors are grateful to SSAB Europe Oy for providing the cold-formed high strength steel tubes. Thanks are due to Wo Lee Steel Co. Ltd. (HK) for their help in the robotic welding of the test specimens. The research work described in this paper was supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. 15218720 ).
Funding Information:
The authors are grateful to SSAB Europe Oy for providing the cold-formed high strength steel tubes. Thanks are due to Wo Lee Steel Co. Ltd. (HK) for their help in the robotic welding of the test specimens. The research work described in this paper was supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. 15218720).
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/9
Y1 - 2021/9
N2 - A test programme looking into the stress concentration factors (SCF) of cold-formed high strength steel (CFHSS) traditional (without brace and/or chord rotation) and member-rotated tubular T-joints is described in this paper. The brace members of traditional T-joints were made of square, rectangular and circular hollow sections (SHS, RHS and CHS), while the brace members of member-rotated T-joints were made of SHS and RHS. On the other hand, the chord members of traditional and member-rotated tubular T-joints were made of SHS. In this study, member-rotated T-joints, include brace-rotated (BR), square bird-beak (SBB) and diamond bird-beak (DBB) tubular T-joints. The tubular members were cold-formed from thermomechanical control processed (TMCP) S900 and S960 steel grades plates. A total of 12 tests was conducted in this experimental investigation. An axial compression load was applied through the brace member, while the chord ends were supported on rollers. The brace and chord members of tubular T-joints were connected using the robotic gas metal arc welding process. The values of normal brace width-to-chord width ratio (β) ranged from 0.33 to 0.73, effective brace width-to-chord width ratio (β’) ranged from 0.40 to 0.87, brace thickness-to-chord thickness ratio (τ) ranged from 0.66 to 1.28 and chord width-to-chord thickness ratio (2γ) ranged from 20.6 to 39.0. The quadratic extrapolation method was used to estimate hot spot strains at the weld toes using the strains measured in the extrapolation regions. The experimental SCF values of CFHSS traditional and member-rotated tubular T-joints were compared with the SCF values obtained from the parametric equations given in the CIDECT (Zhao et al., 2001, [1]) and studies (Tong et al., 2013, [2]; Li et al., 2018, [3]; Tong et al., 2015, [4]). It was found that the existing SCF parametric equations given in the literature (Zhao et al., 2001, [1]; Tong et al., 2013, [2]; Li et al., 2018, [3]; Tong et al., 2015, [4]) could not accurately predict the SCF of cold-formed traditional and member-rotated tubular T-joints made of S900 and S960 steel grades.
AB - A test programme looking into the stress concentration factors (SCF) of cold-formed high strength steel (CFHSS) traditional (without brace and/or chord rotation) and member-rotated tubular T-joints is described in this paper. The brace members of traditional T-joints were made of square, rectangular and circular hollow sections (SHS, RHS and CHS), while the brace members of member-rotated T-joints were made of SHS and RHS. On the other hand, the chord members of traditional and member-rotated tubular T-joints were made of SHS. In this study, member-rotated T-joints, include brace-rotated (BR), square bird-beak (SBB) and diamond bird-beak (DBB) tubular T-joints. The tubular members were cold-formed from thermomechanical control processed (TMCP) S900 and S960 steel grades plates. A total of 12 tests was conducted in this experimental investigation. An axial compression load was applied through the brace member, while the chord ends were supported on rollers. The brace and chord members of tubular T-joints were connected using the robotic gas metal arc welding process. The values of normal brace width-to-chord width ratio (β) ranged from 0.33 to 0.73, effective brace width-to-chord width ratio (β’) ranged from 0.40 to 0.87, brace thickness-to-chord thickness ratio (τ) ranged from 0.66 to 1.28 and chord width-to-chord thickness ratio (2γ) ranged from 20.6 to 39.0. The quadratic extrapolation method was used to estimate hot spot strains at the weld toes using the strains measured in the extrapolation regions. The experimental SCF values of CFHSS traditional and member-rotated tubular T-joints were compared with the SCF values obtained from the parametric equations given in the CIDECT (Zhao et al., 2001, [1]) and studies (Tong et al., 2013, [2]; Li et al., 2018, [3]; Tong et al., 2015, [4]). It was found that the existing SCF parametric equations given in the literature (Zhao et al., 2001, [1]; Tong et al., 2013, [2]; Li et al., 2018, [3]; Tong et al., 2015, [4]) could not accurately predict the SCF of cold-formed traditional and member-rotated tubular T-joints made of S900 and S960 steel grades.
KW - Bird-beak joints
KW - Brace-rotated joints
KW - Cold-formed steel
KW - High strength steel
KW - Stress concentration factors
KW - Tubular T-joints
UR - http://www.scopus.com/inward/record.url?scp=85110241761&partnerID=8YFLogxK
U2 - 10.1016/j.tws.2021.107996
DO - 10.1016/j.tws.2021.107996
M3 - Journal article
AN - SCOPUS:85110241761
SN - 0263-8231
VL - 166
JO - Thin-Walled Structures
JF - Thin-Walled Structures
M1 - 107996
ER -