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Structural performance of cold-formed high strength steel tubular X-Joints under brace axial compression

Pandey, Madhup; Young, Ben

Authors

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MADHUP PANDEY MADHUP.PANDEY@NOTTINGHAM.AC.UK
Assistant Professor in Structural Engineering

Ben Young



Abstract

The experimental investigation presented in this study focused on the static strengths and load-deformation behaviour of cold-formed high strength steel tubular X-joints made up of S900 and S960 steel grades. The X-joints include brace members made up of square, rectangular and circular hollow sections, while chord members were made up of square and rectangular hollow sections. The nominal yield strengths of square and rectangular tubular members were 900 and 960 MPa, while the nominal yield strength of circular tubular members was 900 MPa. Two configurations of tubular X-joints were fabricated, first, where both brace and chord members were made up of square and rectangular hollow sections, and second, where circular hollow section braces were welded to square and rectangular hollow section chord members. The welds were laid using semi-automatic gas metal arc welding process. A total of 34 tests was conducted where an axial compression was applied through the brace members without any chord preload. The ratio of brace-to-chord width (β) ranged from 0.34 to 1, brace-to-chord thickness (τ) from 0.53 to 1.28, chord width-to-thickness (2γ) from 20.2 to 38.9, and chord side wall slenderness (h0/t0) from 12.7 to 39.0. In order to assess the applicability of the existing design provisions, test strengths were compared with the nominal strengths obtained from the Eurocode 3 (EC3) and CIDECT. It is shown that the existing design provisions are not capable of providing accurate and reliable predictions for cold-formed high strength steel tubular X-joints made up of S900 and S960 steel grades.

Citation

Pandey, M., & Young, B. (2020). Structural performance of cold-formed high strength steel tubular X-Joints under brace axial compression. Engineering Structures, 208, Article 109768. https://doi.org/10.1016/j.engstruct.2019.109768

Journal Article Type Article
Acceptance Date Oct 5, 2019
Online Publication Date Feb 13, 2020
Publication Date Apr 1, 2020
Deposit Date Apr 2, 2023
Journal Engineering Structures
Print ISSN 0141-0296
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 208
Article Number 109768
DOI https://doi.org/10.1016/j.engstruct.2019.109768
Public URL https://nottingham-repository.worktribe.com/output/15940604
Publisher URL https://www.sciencedirect.com/science/article/pii/S0141029619315585?via%3Dihub