Elimination of intermediate stiffeners in box link beam using low yield point steel. (January 2022)

• Record Type: Journal Article
• Authors: Pesaran Behbahani, Danial; Fanaie, Nader
• Is Part Of: Journal of constructional steel research. Volume 188(2022)
• Publication Date: 2022-01
• Subjects: Eccentrically braced frame (EBF) -- Box link beam -- Intermediate stiffener -- Low yield point steel -- Finite element method; Steel, Structural -- Periodicals; Building, Iron and steel -- Periodicals; Acier de construction -- Périodiques; Construction métallique -- Périodiques; 624.1821
• DOI: 10.1016/j.jcsr.2021.107014
• Languages: English
• ISSNs: 0143-974X

Abstract

Abstract: The use of intermediate stiffeners in the link beam, in addition to increasing the cost of construction and reducing the speed of execution due to the need to welding operations, can lead to residual stresses. In this study, in order to remove the intermediate stiffeners in box link beam, the idea of using two types of low yield point steel (made in Japan and China) in the web of box link beam has been investigated using the finite element modeling in Abaqus software. According to this study, using low yield point steel in link beam without intermediate stiffeners, the maximum permissible compactness ratio of link web can be considered up to 56% greater than the maximum compactness ratio provided for common structural steels. The overstrength factor for the two types of low yield point steel made in Japan and China is calculated as 4.14 and 2.58 on average, respectively, while the value of this parameter proposed in accordance with AISC seismic provisions for box link beams made of common structural steels is 1.4. Using low yield point steel in the link beam and eliminating the intermediate stiffeners, the energy dissipation of the link beam can be increased to about 30% and its elastic stiffness can be increased to about 45%. In addition, by using low yield point steel and elimination of the intermediate stiffeners, undesirable fracture mode in the vicinity of the stiffeners is removed, and the rotation limit corresponding to fracture of the link beam increases to about 85%. Graphical abstract: Unlabelled Image Highlights: Numerical investigation of short box link beams without intermediate stiffeners by using low yield point steel. Analytical evaluation of link beam's rotational capacity, overstrength factor, energy dissipation, and elastic stiffness. Comparing the seismic responses of eccentrically braced frames, with and without intermediate stiffeners under pushover and cyclic loading. Evaluation of ductile fracture in box link beams, using low yield point or ordinary steels in the web.