Techno Press

Steel and Composite Structures   Volume 17, Number 6, December 2014, pages 951-965
Inelastic response of wide flange steel beams curved by symmetrical weak axis bending using two-point loads
Antoine N. Gergess and Rajan Sen

Abstract     [Full Text]
    Point bending is commonly used for cambering and curving steel girders to large radii. In this system, a hydraulic ram or press is used to apply concentrated loads at selected points to obtain the required vertical (cambering) or horizontal (curving) curved profile from induced permanent deformations. This paper derives closed form solutions that relate loads to permanent deformations for horizontally curving wide flange steel beams based on their post-yield response. These solutions are presented in a parametric form to identify the relationship between key variables and their impact on the accuracy of the curving operation. It is shown that point bending could yield parabolic curved profiles that are within 1% of a desired circular curve if the span length to radius of curvature ratio (L/R) is less than 1.5 and the point loads are spaced at one third the beam length. Safe limits are then established on loads, strains and curvatures to avoid damaging the steel section. This leads to optimization of the point bending operation for inducing a circular profile in wide flange steel beams of any size.
Key Words
    steel; wide flange; non-linear; point bending; radius; inelastic
(1) Antoine N. Gergess:
Department of Civil Engineering, University of Balamand, Al-Koura, P.O. Box 100, Lebanon;
(2) Rajan Sen:
University of South Florida, Tampa, Florida, USA.

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