Ultimate behaviour of steel braces under cyclic loading

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Title: Ultimate behaviour of steel braces under cyclic loading
Authors: Nip, KH
Gardner, L
Elghazouli, AY
Item Type: Journal Article
Abstract: Under significant seismic loading conditions, the response of concentrically braced frames largely depends on the behaviour of the diagonal braces, which represent the key energy dissipating zones. Although the hysteretic response of steel braces under cyclic axial loading has been examined in previous studies, there is a need for further assessments that focus on quantifying failure. This paper describes the development of detailed finite-element models of hollow sections subjected to cyclic axial loading. The effects of initial imperfections and cyclic hardening are taken into consideration and the models are validated against data from 19 tests. A method to predict the fracture life of bracing members under cyclic loading is also described. Using the numerical models, parametric studies are undertaken to assess the influence of global and local slendernesses on the performance of the braces – both are found to affect the occurrence and severity of local buckling under cyclic loading, which causes high localised strains at the corner areas of sections, leading to fatigue fracture. A predictive equation addressing the coexisting influence of global slenderness and local slenderness on displacement ductility is presented. The observations in the current study are compared with conclusions from other experimental programmes, and the discrepancy between the findings is discussed.
Issue Date: 25-May-2015
Date of Acceptance: 8-Feb-2012
URI: http://hdl.handle.net/10044/1/49317
DOI: https://dx.doi.org/10.1680/stbu.11.00028
ISSN: 0965-0911
Publisher: Thomas Telford
Start Page: 219
End Page: 234
Journal / Book Title: Proceedings of the ICE - Structures and Buildings
Volume: 166
Issue: 5
Copyright Statement: © 2013 ICE Publishing, all rights reserved. Original article available at https://dx.doi.org/10.1680/stbu.11.00028. Permission is granted by ICE Publishing to print one copy for personal use. Any other use of these PDF files is subject to reprint fees.
Keywords: Science & Technology
Construction & Building Technology
Engineering, Civil
buildings, structures & design
steel structures
0905 Civil Engineering
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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