A numerical investigation on the fire response of a steel girder bridge
The response of bridges subject to fire is an under researched topic despite the number of bridge failures caused by fire. Since available data shows that steel girder bridges are especially vulnerable to fire, this paper delves into their fire response by analyzing with a 3D numerical model the res...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2012 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/47010 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/47010 |
| Access Level: | acceso abierto |
| Palabra clave: | Bridge Carbon steel Fire Performance-based approach Stainless steel 3D numerical model Axial restraints Bridge failures Bridge girder Corrosive environment Eurocodes Fire loads Fire risks Hydrocarbon fire Live loads Numerical investigations Parametric study Real fire Span length Stainless steel grades Steel girder bridge Structural steels Bridges Building materials Numerical models Plate girder bridges Structural dynamics Three dimensional Fires INGENIERIA CARTOGRAFICA, GEODESIA Y FOTOGRAMETRIA PROYECTOS DE INGENIERIA INGENIERIA DE LA CONSTRUCCION |
| Sumario: | The response of bridges subject to fire is an under researched topic despite the number of bridge failures caused by fire. Since available data shows that steel girder bridges are especially vulnerable to fire, this paper delves into their fire response by analyzing with a 3D numerical model the response of a typical bridge of 12.20 m span length. A parametric study is performed considering: (1) two possibilities for the axial restraint of the bridge deck, (2) four types of structural steel for the girders (carbon steel and stainless steel grades 1.4301, 1.4401, and 1.4462), (3) three different constitutive models for carbon steel, (4) four live loads, and (5) two alternative fire loads (the hydrocarbon fire defined by Eurocode 1 and a fire corresponding to a real fire event). Results show that restraint to deck expansion coming from an adjacent span or abutment should be considered in the numerical model. In addition, times to collapse are very small when the bridge girders are built with carbon steel (between 8.5 and 18 min) but they can almost double if stainless steel is used for the girders. Therefore, stainless steel is a material to consider for steel girder bridges in a high fire risk situation, especially if the bridge is located in a corrosive environment and its aesthetics deserves special attention. The methodology developed in this paper and the results obtained are useful for researchers and practitioners interested in developing and applying a performance-based approach for the design of bridges against fire. © 2012 Elsevier Ltd. All rights reserved. |
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