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Steel and Composite Structures
  Volume 27, Number 5, June10 2018 , pages 545-554

Structural performance of cold-formed steel composite beams
M. Adil Dar, N. Subramanian, M. Anbarasu, A.R. Dar and James B.P. Lim

    This study presents a novel method of improving the strength and stiffness of cold-formed steel (CFS) beams. Flexural members are primary members in most of the structures. Hence, there is an urgent need in the CFS industry to look beyond the conventional CFS beam sections and develop novel techniques to address the severe local buckling problems that exist in CFS flexural members. The primary objective of this study was to develop new CFS composite beam sections with improved structural performance and economy. This paper presents an experimental study conducted on different CFS composite beams with simply supported end conditions under four point loading. Material properties and geometric imperfections of the models were measured. The test strengths of the models are compared with the design strengths predicted by using Australian/New Zealand Standard for cold-formed steel structures. Furthermore, to ensure high precision testing, a special testing rig was also developed for testing of long span beams. The description of test models, testing rig features and test results are presented here. For better interpretation of results, a comparison of the test results with a hot rolled section is also presented. The test results have shown that the proposed CFS composite beams are promising both in terms of better structural performance as well as economy.
Key Words
    failure modes; cold-formed steel composite beams; structural behavior; timber packing; critical load
(1) M. Adil Dar:
Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India;
(2) N. Subramanian:
Consulting Engineer, Maryland, USA;
(3) M. Anbarasu:
Department of Civil Engineering, Government College of Engineering Salem, Tamilnadu, India;
(4) A.R. Dar:
Department of Civil Engineering, National Institute of Technology Srinagar, J&K, India;
(5) James B.P. Lim:
Department of Civil & Environmental Engineering, University of Auckland, New Zealand.

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