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Design and Optimization of Cold-Formed Steel Sections in Bolted Moment Connections Considering Bimoment
| 题名： | Design and Optimization of Cold-Formed Steel Sections in Bolted Moment Connections Considering Bimoment |
| 正文语种： | 英文 |
| 作者： | Duoc T. PhaSeyed Mohammad Mojtabaei; Iman Hajirasouliha;T. L. Lau; James B. P. Lim |
| 作者单位： | Univ, of Nottingham Malaysia;Univ, of Sheffield |
| 关键词： | Cold-formed steel (CFS); Bolted moment connection; Bimoment; Bolt-group length; Optimization |
| 摘要： | The load transfer mechanism in cold-formed steel (CFS) bolted moment conn ections is mainly through the bolt group in the web of beam elements, which may lead to relatively large bimoment and warping deformations. While the bimoment effects can be considered in the Direct Strength Method (DSM), ignoring the fact that the bolt-group length in the conventional design process can lead to nonconservative solutions. This paper presents an altcmative analytical design approach using Eurocode 3 (EC3) effective width method to determine the ultimate flexural strength of CFS bolted moment connections by considering bimoment effects. The results compare very well with previously published expcrimental test data as well as detailed finite-element models developed in this study. It is shown that a short bolt-group length may lead to up to 25% reduction in the flexural strength of the CFS bolted connections. However, a Ion ger bolt-group length generally results in a moment capacity almost equal to the flexural strength of the CFS channel section. Shape optimization is then conducted using a genetic algorithm (GA) to improve the flexural capacity of the connections by taking into account the bimoment effects. The main design variables are considered to be the relative CFS beam cross-sectional dimensions, while the plate slenderness and dimension limits suggested by EC3 as well as a number of manufacturing and practical end-use constraints are incorporated as design constraints. It is found that, compared with standard cross-sectional dimensions, the optimized sections can improve the flexural strength by as much as 36% for a bolt-group length equal to the depth of beam element. |
| 出版日期： | 2020 |
| 出版年： | 2020 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | Vol.146 |
| 期： | No.08 |
| 页码： | 04020153 |
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