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Effect of Strongback System on Progressive Collapse Response of Concentrically Braced Steel Frames
Progressive collapse happens when reasonably small damage in structural elements triggers a cascade of failures that are more excessive than the initial damage, causing the structure to collapse as a whole or a part of it. Strongback bracing system (SBS) is a seismic force resisting system that integrates the characteristics of a conventional inelastic braced system with a substantially elastic steel truss. This paper scrutinizes the effect of strongback system on progressive collapse resistance of concentrically braced steel frames, through which an appropriate design may be developed that results in structurally sound construction, that can withstand both progressive collapse loads and seismic stresses. The progressive collapse performance of structural models is assessed by nonlinear static alternate path method specified in the Unified Facilities Criteria standard. A SBS prototype is designed and analysed considering five major damage scenarios, and are then compared with the responses of a conventional inverted V braced system. Results of the pushdown analysis are presented to demonstrate differences in responses of the braced frame systems with and without strongback. This study showed that the moment frames retrofitted with strongback spine were more resistant to progressive collapse when susceptible to column loss. However, this was reduced when the corner column was removed. Retrofitting the moment frame with strongback spine led to an increase in the cross-section of structural elements owing to its higher progressive collapse resistance.
Effect of Strongback System on Progressive Collapse Response of Concentrically Braced Steel Frames
Progressive collapse happens when reasonably small damage in structural elements triggers a cascade of failures that are more excessive than the initial damage, causing the structure to collapse as a whole or a part of it. Strongback bracing system (SBS) is a seismic force resisting system that integrates the characteristics of a conventional inelastic braced system with a substantially elastic steel truss. This paper scrutinizes the effect of strongback system on progressive collapse resistance of concentrically braced steel frames, through which an appropriate design may be developed that results in structurally sound construction, that can withstand both progressive collapse loads and seismic stresses. The progressive collapse performance of structural models is assessed by nonlinear static alternate path method specified in the Unified Facilities Criteria standard. A SBS prototype is designed and analysed considering five major damage scenarios, and are then compared with the responses of a conventional inverted V braced system. Results of the pushdown analysis are presented to demonstrate differences in responses of the braced frame systems with and without strongback. This study showed that the moment frames retrofitted with strongback spine were more resistant to progressive collapse when susceptible to column loss. However, this was reduced when the corner column was removed. Retrofitting the moment frame with strongback spine led to an increase in the cross-section of structural elements owing to its higher progressive collapse resistance.
Effect of Strongback System on Progressive Collapse Response of Concentrically Braced Steel Frames
Lecture Notes in Civil Engineering
Marano, Giuseppe Carlo (editor) / Rahul, A. V. (editor) / Antony, Jiji (editor) / Unni Kartha, G. (editor) / Kavitha, P. E. (editor) / Preethi, M. (editor) / Nambiar, Namitha A. (author) / Krishnachandran, V. N. (author)
International Conference on Structural Engineering and Construction Management ; 2022 ; Angamaly, India
2022-10-30
12 pages
Article/Chapter (Book)
Electronic Resource
English
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