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- 저자 : Dola F. Nehmeh (검색결과 1 건)
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Finite Element Modeling of Cold Curved Steel Rolled Beams Under Service Loads
Najib G. Saliba,Dola F. Nehmeh,Antoine H. Helal,Antoine N. Gergess 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.2
Cold bending is an effi cient method recommended by steel fabricators for curving structural steel beams. It relies solely on mechanical forces to curve the beam into the required shapes without heating. While extensive research has been conducted on fabrication processes, data on the structural performance of cold bent steel girders in service is scarce which limits its use specifi cally in bridge structure applications. This paper investigates the eff ects of cold bending on the service load capacity of steel rolled shapes. An experimental and analytical program was developed for this purpose. The experimental program consists of cold curving a rolled IPE section about its weak axis and then bending it about its strong axis by applying vertical static loads that simulate service loads. Numerically, fi nite element analysis was conducted and validated based on experimental results. A parametric study was then conducted to identify structural parameters that can adversely aff ect the resistance capacity of cold bent steel rolled beams. Results show that the reduction in resistance capacity of the cold curved steel beam depends on the confi guration of the applied loads and that its structural behavior can be improved by adding stiff eners, bearing plates, modifying the end boundary conditions and introducing load eccentricities. Recommendations are fi nally made to improve the effi ciency of cold curved steel beams in service.
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