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原文传递 Distortional Buckling-Moment Resistance Capacity of Hybrid Double-I-Box Beams

题名：	Distortional Buckling-Moment Resistance Capacity of Hybrid Double-I-Box Beams
其他题名：	AISI(American Iron and Steel Institute).2012.North American specification for the design of cold-formed steel structural members.AISI S-100-12.Washington,DC:AISI.
正文语种：	英文
作者：	M. S. Deepak
关键词：	Distortional buckling;Built-up;Cold-formed steel;Hybrid;Closed box;Member moment resistance capacity;Flange plate slenderness
摘要：	This paper presents a comprehensive experimental and numerical study on distortional buckling-moment resistance capacity of built-up cold-formed steel hybrid double-I-box beams (HDIBBs) under four-point bending. These built-up beams are fabricated by means of four press-braked channel sections that are fastened together using bolted connections. The cross section of this closed-form built-up beam resembles the shape of a double-I box. Three different parameters were considered: (1) a hybrid parameter ratio that is yield strengths of flange steel to web steel (Φh fyf=fyw); (2) ratio of breadth to the overall depth of the section (B/D); and (3) flange thickness etfT. All the tested beams failed in a sort of distortional buckling mode. The test results revealed that the use of higher-grade steel in the flanges had a significant influence on buckling failure modes and moment capacities of the built-up members. In the hybrid built-up beams, the use of thicker and stiffened flange plates enhanced the moment carrying capacity of HDIBBs. It was found that the flange plate slenderness (λpf) plays a major part in reducing the member moment resistance capacity due to local and distortional buckling of flanges. Appropriate nonlinear finite-element (FE) models were developed using commercially available software, and numerical analysis was performed. The FE and actual test results were in good agreement in terms of ultimate moment capacities and buckling modes. Therefore, the FE models were verified. The results were compared with the predicted member buckling resistance capacities from a standard design rule, which was found to slightly overestimate in its results.
出版年：	2018
论文唯一标识：	P-26Y2018V144N09005
英文栏目名称：	TECHNICAL PAPERS
doi：	10.1061/(ASCE)ST.1943-541X.0002100
期刊名称：	Journal of Structural Engineering
拼音刊名(出版物代码)：	P-26
卷：	144
期：	09
页码：	32-47