Finite-element modeling of prestressed cold-formed steel beams

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Title: Finite-element modeling of prestressed cold-formed steel beams
Authors: Hadjipantelis, N
Gardner, L
Wadee, MA
Item Type: Journal Article
Abstract: The concept and structural benefits of prestressing cold-formed steel beams are explored in the present paper. In the proposed system, prestressing is applied by means of a high-strength steel cable located within the cross section of the beam at an eccentric location with respect to the strong geometric axis. The internal forces generated by the prestressing are opposite in sign to those induced under subsequent vertical loading. Hence, the development of detrimental compressive stresses within the top region of the cold-formed steel beam is delayed and thus the load-carrying capacity of the beam is enhanced. Owing to the precamber that is induced along the member during the prestressing stage, the overall deflections of the beam are also reduced significantly. In the present paper, finite-element (FE) modeling was employed to simulate the mechanical behavior of prestressed cold-formed steel beams during the prestressing and vertical loading stages. Following the validation of the FE modeling approach, a set of parametric studies was conducted, where the influence of the key controlling parameters on the structural benefits obtained from the prestressing process was investigated. The parametric results were utilized to determine how the benefits obtained from the addition of the prestressed cable can be maximized, demonstrating the significant enhancements in the performance of the cold-formed steel beam that can be achieved.
Issue Date: 1-Oct-2019
Date of Acceptance: 15-Jan-2019
URI: http://hdl.handle.net/10044/1/67145
DOI: https://doi.org/10.1061/(ASCE)ST.1943-541X.0002375
ISSN: 0733-9445
Publisher: American Society of Civil Engineers
Start Page: 04019100-1
End Page: 04019100-19
Journal / Book Title: Journal of Structural Engineering
Volume: 145
Issue: 10
Copyright Statement: © 2019 American Society of Civil Engineers. Available in ASCE's Civil Engineering Database https://doi.org/10.1061/(ASCE)ST.1943-541X.0002375 .
Sponsor/Funder: Imperial College London
Keywords: Science & Technology
Technology
Construction & Building Technology
Engineering, Civil
Engineering
STRESS-STRAIN CURVES
BUCKLING TESTS
BEHAVIOR
DESIGN
Civil Engineering
0905 Civil Engineering
Publication Status: Published
Article Number: 04019100
Online Publication Date: 2019-07-26
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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