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Curving structural steel girders by two-point bending
Abstract Point bending is often used for cambering and curving steel girders to large radii. In this method, a fabricated straight girder is bent by concentrated loads applied at the third points using hydraulic jacks. The required geometric profile develops from permanent residual deformations induced upon removing the loads. The resulting shape is not circular but closer to a parabolic shape. The goal of this paper is to evaluate the profiles of structural steel girders curved by point bending in the post-yield range and explore alternative loading configurations that result in the fabrication of specimens that better approximate circular curves. Limits are developed on the minimum radius of curvature that can be achieved to ensure accuracy of the idealization and on the induced strain to avoid damaging the steel section or adversely affecting the physical properties of steel. The accuracy of the proposed analysis is established by comparing predictions against available experimental results from a full-scale test. Further validation is also provided based on comparisons with results from 3-D finite element analysis incorporating initial residual stresses and geometric imperfections.
Highlights Point bending relies on post-yield loads to induce circular curves in steel beams. The circular curve develops based on the residual deformed shape due to weak axis bending. Loading configurations that better approximate circular curves without damaging steel or adversely affecting its physical properties are explored. The process is validated by full-scale testing and 3-D finite element analysis. Recommendations assist in selecting appropriate loading set-ups and hydraulic jack capacities in structural and architectural applications.
Curving structural steel girders by two-point bending
Abstract Point bending is often used for cambering and curving steel girders to large radii. In this method, a fabricated straight girder is bent by concentrated loads applied at the third points using hydraulic jacks. The required geometric profile develops from permanent residual deformations induced upon removing the loads. The resulting shape is not circular but closer to a parabolic shape. The goal of this paper is to evaluate the profiles of structural steel girders curved by point bending in the post-yield range and explore alternative loading configurations that result in the fabrication of specimens that better approximate circular curves. Limits are developed on the minimum radius of curvature that can be achieved to ensure accuracy of the idealization and on the induced strain to avoid damaging the steel section or adversely affecting the physical properties of steel. The accuracy of the proposed analysis is established by comparing predictions against available experimental results from a full-scale test. Further validation is also provided based on comparisons with results from 3-D finite element analysis incorporating initial residual stresses and geometric imperfections.
Highlights Point bending relies on post-yield loads to induce circular curves in steel beams. The circular curve develops based on the residual deformed shape due to weak axis bending. Loading configurations that better approximate circular curves without damaging steel or adversely affecting its physical properties are explored. The process is validated by full-scale testing and 3-D finite element analysis. Recommendations assist in selecting appropriate loading set-ups and hydraulic jack capacities in structural and architectural applications.
Curving structural steel girders by two-point bending
Gergess, Antoine (Autor:in) / Sen, Rajan (Autor:in)
Journal of Constructional Steel Research ; 122 ; 511-519
06.04.2016
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Curving structural steel girders by two-point bending
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Elsevier | 2016
|Curving structural steel girders by two-point bending
British Library Online Contents | 2016
|Curving structural steel girders by two-point bending
British Library Online Contents | 2016
|Curving structural steel girders by two-point bending
British Library Online Contents | 2016
|