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Improving the ductility of knee joints between rectangular hollow sections

Journal Article


Abstract


  • This paper proposes a new welding-based solution that significantly increases the rotation capacity of a stiffened welded knee joint between cold-formed rectangular hollow sections under opening moment. The proposed solution is more economical than the use of internal sleeves and can be applied to new as well as existing structures. The solution involves the use of extra layers of weld on the inner (tension) flange of a stiffened welded knee joint. Laboratory test results are presented to demonstrate that the solution enabled such a joint between DuraGal C450 150 × 50 × 4 or 150 × 50 × 5 rectangular hollow sections manufactured to AS 1163 to satisfy the rotation capacity requirement specified for plastic design of steel frames. The reason why the new solution results in increased rotation capacities is explained in terms of strain redistribution and strain reduction in the tensile regions around the knee joints.

Publication Date


  • 2004

Citation


  • Teh, L. H., & Hancock, G. J. (2004). Improving the ductility of knee joints between rectangular hollow sections. Journal of Structural Engineering, 130(11), 1790-1798. doi:10.1061/(ASCE)0733-9445(2004)130:11(1790)

Scopus Eid


  • 2-s2.0-13844266368

Start Page


  • 1790

End Page


  • 1798

Volume


  • 130

Issue


  • 11

Abstract


  • This paper proposes a new welding-based solution that significantly increases the rotation capacity of a stiffened welded knee joint between cold-formed rectangular hollow sections under opening moment. The proposed solution is more economical than the use of internal sleeves and can be applied to new as well as existing structures. The solution involves the use of extra layers of weld on the inner (tension) flange of a stiffened welded knee joint. Laboratory test results are presented to demonstrate that the solution enabled such a joint between DuraGal C450 150 × 50 × 4 or 150 × 50 × 5 rectangular hollow sections manufactured to AS 1163 to satisfy the rotation capacity requirement specified for plastic design of steel frames. The reason why the new solution results in increased rotation capacities is explained in terms of strain redistribution and strain reduction in the tensile regions around the knee joints.

Publication Date


  • 2004

Citation


  • Teh, L. H., & Hancock, G. J. (2004). Improving the ductility of knee joints between rectangular hollow sections. Journal of Structural Engineering, 130(11), 1790-1798. doi:10.1061/(ASCE)0733-9445(2004)130:11(1790)

Scopus Eid


  • 2-s2.0-13844266368

Start Page


  • 1790

End Page


  • 1798

Volume


  • 130

Issue


  • 11