Structural coupling mechanism of high strength steel and mild steel under multiaxial cyclic loading

Fatemeh Javidan, Amin Heidarpour, Xiao Ling Zhao, Riadh Al-Mahaidi

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

High strength steel is widely used in industrial applications to improve the load-bearing capacity and reduce the overall weight and cost. To take advantage of the benefits of this type of steel in construction, an innovative hybrid fabricated member consisting of high strength steel tubes welded to mild steel plates has recently been developed. Component-scale uniaxial and multiaxial cyclic experiments have been conducted with simultaneous constant or varying axial compression loads using a multi-axial substructure testing facility. The structural interaction of high strength steel tubes with mild steel plates is investigated in terms of member capacity, strength and stiffness deterioration and the development of plastic hinges. The deterioration parameters of hybrid specimens are calibrated and compared against those of conventional steel specimens. Effect of varying axial force and loading direction on the hysteretic deterioration model, failure modes and axial shortening is also studied. Plate and tube elements in hybrid members interact such that the high strength steel is kept within its ultimate strain range to prevent sudden fracture due to its low ultimate to yield strain ratio while the ductile performance of plate governs the global failure mechanism. High strength material also significantly reduces the axial shortening in columns which prevents undesirable frame deformations.

Original languageEnglish
Pages (from-to)229-242
Number of pages14
JournalSteel and Composite Structures
Volume27
Issue number2
DOIs
Publication statusPublished - 25 Apr 2018

Keywords

  • Ductile failure
  • High strength steel tubes
  • Hybrid fabricated members
  • Hysteretic deterioration
  • Lateral cyclic loading
  • Varying axial force

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