Análisis de la respuesta frente al fuego de puentes metálicos multijácena
Bridges are critical elements of the transportation system whose loss can have serious social and economic consequences. To minimize the likelihood of these negative consequences, codes define the loads to be considered when designing a bridge. In this context, extraordinary actions such as earthqua...
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| Tipo de recurso: | tesis doctoral |
| Fecha de publicación: | 2017 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | español |
| OAI Identifier: | oai:riunet.upv.es:10251/82602 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/82602 |
| Access Level: | acceso abierto |
| Palabra clave: | Incendio Puentes CFD FEM Fuego |
| Sumario: | Bridges are critical elements of the transportation system whose loss can have serious social and economic consequences. To minimize the likelihood of these negative consequences, codes define the loads to be considered when designing a bridge. In this context, extraordinary actions such as earthquakes or floods have been studied in the past and are widely reflected in the bibliography and in current regulations. However the effects of fire on bridges have been poorly studied and there is not any standard to help the design engineer to deal with the problem. This lack of standards contrasts with the importance of fire on bridges as shown by the number and consequences of such incidents in the past. In this context, this Thesis establishes part of the basis required for the development of a code specific for bridge fires and also analyzes the fire response of a steel multi-girder bridges. To reach these goals, a research and analysis of real bridge fire events has been carried out. This research has enabled to obtain patterns in bridge fires and has helped to define which bridges are more susceptible to suffer serious damage due to a fire. Once the critical incidents and bridges have been found, this Thesis studies using numerical models the structural response of a typical multi-girder steel bridge to a tanker truck fire under its deck. In this study, special emphasis is placed on the boundary conditions of the model to realistically reproduce the behavior of the bridge. In addition, simplifications of the model are studied to decrease the complexity of the numerical models used as well as the computing times. Once the model has been validated and the simplifications are applied, the influence of different parameters (geometric, environmental and relative to the fire load) on the temperatures reached by the structural system studied and therefore, its collapse risk, has been studied. This study lays the foundations for a future definition of parametric fire curves specific for bridges. |
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