Effects of span-to-depth ratios on moment connection damage evolution under catenary action

Li, L, Wang, W, Teh, L and Chen, Y 2017, 'Effects of span-to-depth ratios on moment connection damage evolution under catenary action', Journal of Constructional Steel Research, vol. 139, pp. 18-29.

Document type: Journal Article
Collection: Journal Articles

Title Effects of span-to-depth ratios on moment connection damage evolution under catenary action
Author(s) Li, L
Wang, W
Teh, L
Chen, Y
Year 2017
Journal name Journal of Constructional Steel Research
Volume number 139
Start page 18
End page 29
Total pages 12
Publisher Elsevier Ltd
Abstract This paper proposes an improved method for determining the gravity resistance of a moment resisting beam-column assembly following an interior column loss. The proposed method accounts for the connection's damage evolution and for the catenary mechanism developed by the assembly as it deflects downward. Through a full-scale laboratory test and finite element simulations, the complete responses of moment resisting beam-column assemblies including the connection's damage evolution are investigated under different beam span-to-depth ratios. The welded unreinforced flange-bolted web (WUF-BW) connection method is used for its robustness in developing the catenary action. It is found that, under the same span-to-depth ratio, beam-column assemblies exhibit similar normalized load-rotation relationships, even with different beam depths. The assembly with a larger span-to-depth ratio is able to develop the gravity resistance earlier, and provides a higher ultimate resistance by developing a more effective catenary mechanism. On the other hand, the assembly with a smaller span-to-depth ratio exhibits a more ductile response. A simplified curve model of the gravity resistance development of a moment beam-column assembly with damage evolution has been proposed for a convenient assessment of the progressive collapse resistance following a central column loss.
Subject Structural Engineering
Keyword(s) Catenary mechanism
Damage evolution
Gravity resistance development
Progressive collapse
Span-to-depth ratio
Steel moment connection
DOI - identifier 10.1016/j.jcsr.2017.09.011
Copyright notice © 2017 Elsevier Ltd. All rights reserved.
ISSN 0143-974X
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