Applicability of the 500°C isotherm method in determining the strength of reinforced concrete beams after fire

Aplicabilidade do método dos 500°C na determinação da resistência de vigas em concreto armado após incêndio

Abstract

A procedure to estimate the residual bending moment and the shear load capacity after fire in reinforced concrete beams was evaluated. The calculation method is based on the 500ºC Isotherm Method, adopting the reduction coefficients proposed by Van Coile et al. (2014) for the steel yield strength. The proposed method validation was done from experimental results of 62 reinforced concrete beams available in the literature. It was possible to observe a good approximation of the analytical method with the experimental data. For the bending moment an average ratio ${\text{M}}_{\text{r}}^{\text{ana}}/{\text{M}}_{\text{r}}^{\text{exp}}$ of 1.04 and standard deviation of 0.15 was found. For the shear force an average ratio ${\text{V}}_{\text{r}}^{\text{ana}}/{\text{V}}_{\text{r}}^{\text{exp}}$ of 0.85 and standard deviation of 0.23 was found.

Keywords:
residual strength; shear; bending moment; after fire