Effect of exposure time to fire in flexural strength of reinforced concrete beams

Gaceta Técnica

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Title Effect of exposure time to fire in flexural strength of reinforced concrete beams
Efecto del tiempo de exposición al fuego en la resistencia a flexión de vigas de hormigón armado
 
Creator Ureña Aguirre, Maritza Elizabeth
Alvarado Aguirre, Giovanni Josué
 
Description This paper discusses the flexural strength of reinforced concrete beams of square cross section, exposed to fire during different times. After being exposed to fire the beams were left to cool at room temperature for 24 hours, the changes produced by this phenomenon were evaluated by observation. The temperatures reached oscillated between 750 °C and 1050 °C. Through the ASTM C78 test it was determined that the flexural strength decreases drastically as the temperature and exposure time of the beams increases, showing different signs of degradation ranging from a slight calcination and change of coloration to the loss of section of the element. This research showed that the flexural strength decreased by more than 90% with respect to the beams not exposed to fire, this result was obtained when a temperature of 1050 °C was reached at 180 minutes of exposure to fire
En este artículo se discute la resistencia a flexión de vigas de hormigón armado de sección transversal cuadrada, expuestas al fuego durante diferentes tiempos. Después de ser expuestas se enfriaron a temperatura ambiente durante 24 horas, momento en que se evaluaron mediante observación los cambios producidos. Las temperaturas alcanzadas oscilaron entre los 750°C y 1050°C. Mediante el ensayo ASTM C78 se determinó que la resistencia a flexión disminuye drásticamente conforme aumenta la temperatura y tiempo de exposición de las vigas al fuego, mostrando diferentes signos de degradación que van desde una calcinación leve y cambio de coloración, a inclusive la perdida de sección del elemento. Esta investigación mostró que la resistencia a flexión disminuyó en más del 90% con respecto a las vigas no expuestas al fuego, resultado obtenido cuando se alcanzó una temperatura de 1050°C a 180 minutos de exposición al fuego
 
Publisher Universidad Centroccidental Lisandro Alvarado - Decanato de Ingeniería Civil
 
Date 2018-07-11
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Artículo científico de investigación original
 
Format application/pdf
 
Identifier https://revistas.ucla.edu.ve/index.php/gt/article/view/1133
10.13140/RG.2.2.10804.35203
 
Source Gaceta Técnica; Vol 19 No 2 (2018): July-December; 7-18
Gaceta Técnica; Vol. 19 Núm. 2 (2018): Julio-Diciembre; 7-18
Gaceta Técnica; v. 19 n. 2 (2018): Julio-Diciembre; 7-18
2477-9539
1856-9560
 
Language spa
 
Relation https://revistas.ucla.edu.ve/index.php/gt/article/view/1133/467
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