Imperial College London
Alternate

Professor M Ahmer Wadee

Faculty of Engineering, Department of Civil and Environmental Engineering

Professor of Nonlinear Mechanics
 
 
 
//

Contact

 

+44 (0)20 7594 6050a.wadee Website

 
 
//

Assistant

 

Ms Ruth Bello +44 (0)20 7594 6040

 
//

Location

 

421Skempton BuildingSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Hadjipantelis:2018:10.1016/j.engstruct.2018.06.027,
author = {Hadjipantelis, N and Gardner, L and Wadee, MA},
doi = {10.1016/j.engstruct.2018.06.027},
journal = {Engineering Structures},
pages = {1057--1072},
title = {Prestressed cold-formed steel beams: concept and mechanical behaviour},
url = {http://dx.doi.org/10.1016/j.engstruct.2018.06.027},
volume = {172},
year = {2018}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - An innovative concept, whereby the load-carrying capacity and serviceability performance of cold-formed steel beams are enhanced by utilising prestressing techniques, is presented. The prestressing force is applied by means of a high-strength steel cable, which is housed at a location eccentric to the strong geometric axis within the bottom hollow flange of the cold-formed steel beam, inducing initial stresses in the beam that are opposite in sign to those introduced during the subsequent loading stage. As a consequence, the development of local instabilities during loading is delayed and thus the capacity of the beam is enhanced. Furthermore, the pre-camber induced during prestressing, as well as the contribution of the cable to the bending stiffness of the system, decrease the overall vertical deflections of the beam. The conceptual development of prestressed cold-formed steel beams and a study investigating the potential benefits are presented. The mechanical behaviour of the proposed beams in both the prestressing and imposed loading stages is described in terms of analytical expressions, while failure criteria for the design of the cold-formed steel beam and the cable are also developed by employing interaction equations in conjunction with the Direct Strength Method. Geometrically and materially nonlinear finite element analysis with imperfections is employed to simulate the behaviour of the proposed beams. Sample numerical results are presented and compared with the developed analytical expressions and failure criteria, demonstrating the substantial enhancement in moment capacity and serviceability performance offered by these beams.
AU  - Hadjipantelis,N
AU  - Gardner,L
AU  - Wadee,MA
DO  - 10.1016/j.engstruct.2018.06.027
EP  - 1072
PY  - 2018///
SN  - 0141-0296
SP  - 1057
TI  - Prestressed cold-formed steel beams: concept and mechanical behaviour
T2  - Engineering Structures
UR  - http://dx.doi.org/10.1016/j.engstruct.2018.06.027
UR  - https://www.sciencedirect.com/science/article/abs/pii/S0141029618304309?via%3Dihub
UR  - http://hdl.handle.net/10044/1/61070
VL  - 172
ER  -
Download