Non-linear finite element model to predict temperature histories within reinforced concrete in fires

A non-linear finite element procedure is proposed to predict the temperature distribution history of cross-sections of structural members, such as beams composed of reinforced concrete, in fire conditions. In this model the effect of moisture in concrete has been taken into account, and the thermal properties of concrete have been considered as temperature and moisture dependent. In order to validate the model, a series of proving tests have been carried out through a quantitative verification of the model against known test results and fairly good accuracy is found.