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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 106
PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Edited by: B.H.V. Topping and P. Iványi
Paper 16

Non-Linear Analysis of Wide Flange Steel Beams Subjected to Point Bending

A.N. Gergess1 and R. Sen2

1University of Balamand, El-Koura, North Lebanon, Lebanon
2University of South Florida, Tampa, Florida, USA

Full Bibliographic Reference for this paper
A.N. Gergess, R. Sen, "Non-Linear Analysis of Wide Flange Steel Beams Subjected to Point Bending", in B.H.V. Topping, P. Iványi, (Editors), "Proceedings of the Twelfth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 16, 2014. doi:10.4203/ccp.106.16
Keywords: steel girder, non-linear, residual deformations, point bending, radius..

Summary
Gag pressing is sometimes used for cambering and curving steel girders to large radii. In this system, a hydraulic ram presses the girder at selected points to obtain the desired curved profile from induced permanent deformations. This paper presents closed form solutions which relate the applied loads to induced residual deformations for horizontally curving wide flange steel beams based on their postyield response. These solutions are then presented in a parametric form to identify the relationship between key variables and their impact on the accuracy of the curving operation. The idealized qualitative response of the desired curve based on the deformed shape of the girder shows that point bending could yield parabolic curved profiles that are within a percent of a desired circular curve if the span length to radius of curvature ratio is less than 1.5 and the point loads are spaced at one third the beam length. Safe limits are established for loads, strains and curvatures to avoid damaging the steel section. Application of the process is illustrated by a comprehensive numerical example.

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