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Seismic performance of cold-formed steel bolted moment connections with bolting friction-slip mechanism

Ye, Jun; Mojtabaei, Seyed Mohammad; Hajirasouliha, Iman

Seismic performance of cold-formed steel bolted moment connections with bolting friction-slip mechanism Thumbnail


Authors

Jun Ye

Seyed Mohammad Mojtabaei

Iman Hajirasouliha



Abstract

© 2019 Elsevier Ltd Typical cold-formed steel (CFS) moment-resisting connections generally have relatively low ductility and energy dissipation capacity as a result of low local/distortional buckling resistance of thin-walled CFS elements, and therefore, may not be suitable for seismic applications. To address this issue, a comprehensive analytical study is presented on the seismic performance of CFS bolted beam-to-column connections with fiction-slip mechanism aiming to obtain more efficient design solutions suitable for CFS frames in seismic regions. Experimentally validated finite element (FE) models in ABAQUS are used to predict the hysteretic behaviour and failure of a range of CFS connections by taking into account the characteristics of the bolting system as well as nonlinear material properties and geometrical imperfections. The developed models are then used to investigate the effects of CFS beam cross-sectional shape and classification, bolt configuration, and slip resistance on the seismic performance of the connections. It is shown that using bolting friction-slip mechanism can significantly increase (up to 200%) the ductility, energy dissipation capacity and damping coefficient of the connections especially for CFS beams with thinner plates (class 3 and 4). Based on the results, the best design configurations are identified to improve the cyclic response of the CFS connections under strong earthquakes. While conventional bolted moment connections with class 3 and 4 beam cross-sections generally do not satisfy the AISC requirements for intermediate and special moment frames, it is shown that optimum designed connections with bolting friction-slip mechanism can be efficiently used in high seismic regions.

Citation

Ye, J., Mojtabaei, S. M., & Hajirasouliha, I. (2019). Seismic performance of cold-formed steel bolted moment connections with bolting friction-slip mechanism. Journal of Constructional Steel Research, 156, 122-136. https://doi.org/10.1016/j.jcsr.2019.01.013

Journal Article Type Article
Acceptance Date Jan 19, 2019
Online Publication Date Feb 12, 2019
Publication Date May 1, 2019
Deposit Date Mar 21, 2019
Publicly Available Date Feb 13, 2020
Journal Journal of Constructional Steel Research
Print ISSN 0143-974X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 156
Pages 122-136
DOI https://doi.org/10.1016/j.jcsr.2019.01.013
Keywords cold-formed steel, seismic performance, friction-slip mechanism, bolted moment connection, cyclic behaviour, optimum design
Public URL https://uwe-repository.worktribe.com/output/846497
Publisher URL https://doi.org/10.1016/j.jcsr.2019.01.013
Related Public URLs https://www.sciencedirect.com/

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