Design-oriented assessment of the residual post-fire bearing capacity of precast fiber reinforced concrete tunnel linings
| Autor: | Ramoel Serafini, Ronney R. Agra, Antonio Fernando Berto, Sérgio Roberto Andrade Dantas, Antonio Domingues de Figueiredo, Albert de la Fuente |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. EC - Enginyeria de la Construcció |
| Rok vydání: | 2022 |
| Předmět: |
Reinforced concrete -- Fire-testing
Bearing capacity Materials science Bending (metalworking) General Physics and Astronomy Numerical simulation Fiber-reinforced concrete Residual law.invention law INCÊNDIO Precast concrete Ultimate tensile strength General Materials Science Safety Risk Reliability and Quality business.industry Steel fiber reinforced concrete Enginyeria civil::Materials i estructures::Materials i estructures de formigó [Àrees temàtiques de la UPC] General Chemistry Building and Construction Structural engineering Fire Tunnel lining Reduction (mathematics) business Formigó armat -- Assaigs de comportament davant el foc |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| ISSN: | 0379-7112 |
| DOI: | 10.1016/j.firesaf.2021.103503 |
| Popis: | This study presents a meso-scale experimental program and employs a numerical approach to determine the bearing capacity of steel fiber reinforced concretes (SFRC) tunnel linings after fire exposure. First, the effect of temperature on the mechanical properties of SFRC was determined through a refined experimental campaign. Additionally, the suitability of the bending test and the DEWS test to assess the post-fire tensile properties of the SFRC was verified. Then, a thermo-mechanical model was implemented to assess the changes in the bearing capacity of SFRC for tunnels built with TBM technology. Results show that the thermo-mechanical model properly estimated the temperature distribution and the mechanical properties as a function of the duration of fire (t) and depth (z). The bearing capacity of the SFRC segments exposed to the ISO 834 and HFC fire curves were comparable when the condition t ISO = 2 t HFC was satisfied. Additionally, a greater bearing capacity reduction was numerically observed when the compressive region of the cross-section is affected by fire. The results obtained aid in the definition of appropriate rehabilitation operations, classifying the degree of damage sustained by the structure, and provides a procedure for designers regarding the effect of fire on SFRC structures. |
| Databáze: | OpenAIRE |
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