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Estudio metalúrgico de causas de falla del puente pescadero
DOI:
https://doi.org/10.15446/ing.investig.n39.20973Keywords:
Puentes, Aceros estructurales, Ensayo de tenacidad de fractura, Ensayo de tensión, Análisis estructural de puentes, Análisis de estabilidad (es)Bridges, Structural steels, Fracture toughness test, Tensile test, Bridge structural analysis, Stability analysis (en)
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Se trata de un puente en arco de una sola luz de 120 m, el cual colapsó después de 10 años de servicio. Con base en elementos estructurales extraídos del puente de falla, se realizó un estudio fractografico, mecánico y químico, con el fin de establecer las posibles causas de fallas del puente desde el punto de vista metalúrgico. En nudos de unión de pendolón-arco se observan fracturas por fatiga en uniones soldadas en varios sitios, lo cual es evidenciado por una apariencia de fractura suave de crecimiento estable de grietas combinada con una zona de apariencia fibrosa de fractura súbita final de colapso del puente. Dado que el colapso del puente es precedido por la generación de grietas en uniones soldadas, se considera importante examinar la combinación de las propiedades de resistencia y tenacidad con el fin de estudiar tanto la capacidad de soporte de carga como de la tolerancia de defectos de las uniones soldadas.
References
ANSI/AASHTO/AWS D1. 5-88, Bridge Welding Code. American Welding Society, Miami, Fla.
Powell, G W. and Cord., Metals Handbook, 9 Ed., vol.11, Failure Analysis and Prevention, American Society for Metals. 1986. p.
Clayton, Design of Welded Structures to Avoid Fracture and Plastic Collapse. Welding in the World, vol 32., Pergamon Press Ltd. pp 25-32. 1993.
Newby, J.R. and Coord. Metals Handbook. 9 Ed, vol. 8, Mechanical Testing, American Society for Metals. 1985. pp 265.
Dolby, R.E. Cod Charpy v Test Data Correlation: Ferritic Steel Weld Metals. The Welding. Institute,1981.
Standard Test Method for Crack - Tip Opening Displacement CTOD Fracture Toughness Measurement. E 1290, ASTM Standards. Vol 03. 01, 1989.
BS PD 6493. Guidance on some methods for the derivation of acceptance levels for defects in fusion welded joints. British Standards Institution. 1980.
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Copyright (c) 1998 Héctor Delgado, Héctor Hernández
This work is licensed under a Creative Commons Attribution 4.0 International License.
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