Abstract
The importance of structural design under fire conditions, together with the uncertainty in the behavior and resistance of reinforced concrete structures with fiber-reinforced polymer bars (FRP) at high temperatures, reveal the need for more research along these lines. Although there are studies evaluating the flexural and shear strength of elements exposed to fire, there are no standards nor regulations specifying the procedures thereto. This work proposes methods to calculate shear strength in FRP-reinforced concrete beams, with rectangular cross-section, based on the degradation of the properties of the materials and/or the reduced concrete cross-section, as recommended by (Diab, 2014), Eurocode 2 (EN-1992-1-2, 2004) and (Saafi, 2002). In accordance with the thermal analysis executed with the Super Tempcalc software, these procedures were applied to 13 beams of different dimensions and reinforcements, subjected to standard fire of the ISO-834 standard on three sides, thereby obtaining the shear capacity degradation curves for each case. The results show that the differences between the shear strength values were very small throughout the total fire exposure time.
Highlights
La importancia del diseño de estructuras expuestas al fuego, junto con la incertidumbre en el comportamiento y resistencia de las estructuras de hormigón armado con barras de polímeros reforzados con fibras (PRF) a elevadas temperaturas, evidencian la necesidad de más investigaciones en este sentido
The results show that the differences between the shear strength values were very small throughout the total fire exposure time
Evaluation of thermal resistance of fiberreinforced polymer bars (FRP) reinforced concrete beams in fire
Summary
El impacto mundial que han generado los polímeros reforzados con fibras (PRF) en la ingeniería civil está dado principalmente por las grandes ventajas que presenta su empleo en la construcción, como son: su alta resistencia a la corrosión, la elevada relación resistencia / peso en comparación con el acero, además de su resistencia a la acción de sustancias químicas y a la fatiga. En elementos de hormigón armado con PRF, el incremento de la temperatura produce una disminución de la resistencia y la rigidez de las barras, así como la pérdida de adherencia entre la barra y el hormigón, dada fundamentalmente por la degradación de la matriz (Hajiloo et al 2018); (Özkal, et al, 2018)
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