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Retrofit of existing steel structures against progressive collapse through roof-truss

Freddi, F; Ciman, L; Tondini, N; (2022) Retrofit of existing steel structures against progressive collapse through roof-truss. Journal of Constructional Steel Research , 188 , Article 107037. 10.1016/j.jcsr.2021.107037.

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Freddi et al_2021_Retrofit of existing steel structures against progressive collapse through roof-truss - Author's Version.pdf - Accepted Version
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Abstract

The paper presents the results of a comprehensive study on the evaluation of the effectiveness of a retrofit strategy of existing steel buildings against progressive collapse. In this respect, it investigates the performance and the design of a retrofit solution to increase the robustness of steel Moment Resisting Frame buildings. A truss steel system added at the building's rooftop level (i.e., ‘roof-truss’), and intended to define an alternative load path, was investigated as a retrofit solution. The numerical model key components, including the plastic hinges and the beam-column connections, were validated against available experimental results. The validated models were then used to study the robustness of the structure under column loss scenarios by means of non-linear static and dynamic analyses performed in OpenSees. The simulations allowed for the identification of possible failure modes and alternative load paths together with the definition of the Dynamic Increase Factor (DIF). In this regard, it is shown that column buckling is critical for the selected case study. Moreover, the outcomes showed how the proposed retrofit solution allows the definition of effective alternative load paths when subjected to column loss scenarios and informs on the critical details that should be checked by employing this retrofit system.

Type: Article
Title: Retrofit of existing steel structures against progressive collapse through roof-truss
DOI: 10.1016/j.jcsr.2021.107037
Publisher version: https://doi.org/10.1016/j.jcsr.2021.107037
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Progressive collapse, Steel moment resisting frames, Retrofit, Roof-truss, Dynamic increase factor, Non-linear static analysis, Non-linear dynamic analysis
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10138102
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