Conference Publication Details
Mandatory Fields
Goggins J. M., Broderick B. M., Lucas, A. S.
Proceedings of The Second International Conference on Structural Engineering, Mechanics and Computation
Cyclic response of cold-formed hollow steel bracing members.
Optional Fields
Cyclic loading Cold-formed Steel Brace Bracing member Testing Seismic Earthquake engineering Earthquakes Structures Structural engineering
Cape Town, South Africa
The earthquake resistance of many building structures is provided by steel bracing members.  RHS and CHS members are often employed as bracing members for structural as well as aesthetic reasons.  This paper describes an experimental study of the response of fixed-ended steel SHS and RHS members to monotonic and cyclic axial loading. Twenty-one short specimens made from cold-formed steel grade S235JRH sections with an aspect ratio of three were tested under displacement-controlled monotonic loading. Eighteen longer specimens with normalised slendernesses between 0.4 and 3.2 were tested under cyclic axial displacements of increasing amplitudes.  In both sets of tests, three cross-sectional geometries were employed: 20x20x2.0mm SHS, 40x40x2.5mm SHS and 50x25x2.5mm RHS. The objective of the short specimen tests was to relate tensile material strength and section resistance. The observed results are compared to design provisions of Eurocode 3 and AISI. The objective of the tests on longer specimens was to determine their likely behaviour under strong earthquake loading. The steel hollow brace members exhibited stable hysteresis behaviour up to local buckling, and then showed considerable degradation in strength and ductility depending on their slenderness and b/t ratios. First-cycle buckling loads are compared with design loads predicted by international steel specifications. The effects of section and member slenderness on the strength, ductility, and energy absorption capacity of the braces are examined.
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