Techno Press
Techno Press

Steel and Composite Structures   Volume 27, Number 2, April25 2018, pages 229-242
Structural coupling mechanism of high strength steel and mild steel under multiaxial cyclic loading
Fatemeh Javidan, Amin Heidarpour, Xiao-Ling Zhao and Riadh Al-Mahaidi

Abstract     [Full Text]
    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.
Key Words
    high strength steel tubes; hybrid fabricated members; lateral cyclic loading; varying axial force, hysteretic deterioration, ductile failure
(1) Fatemeh Javidan, Amin Heidarpour, Xiao-Ling Zhao:
Department of Civil Engineering, Monash University, Melbourne, Australia;
(2) Riadh Al-Mahaidi:
Department of Civil and Construction Engineering, Swinburne University of Technology, Melbourne, Australia.

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