Title:
Validation and Application of a Computer Model for Predicting the Thermal Response of Concrete Slabs Subjected to Fire
Author(s):
James P. Hurst and Gamal N. Ahmed
Publication:
Structural Journal
Volume:
95
Issue:
5
Appears on pages(s):
480-487
Keywords:
carbonate aggregate concrete; codes; elevated temperatures;
fire resistance; heat transfer; heat transmission end point; mass transfer;
moisture content; nonexposed surface temperature; performance-based design;
pore pressure;
DOI:
10.14359/562
Date:
9/1/1998
Abstract:
A computer model is presented that predicts the thermal response of carbonate and siliceous aggregate (normal weight) concrete slab specimens subjected to fire. Validation of the model is based on data that were collected during comprehensive fire test programs conducted by the Portland Cement Association1 in the 1960s. The model’s ability to replicate the experimental results with good agreement substantiates it as a valuable analytical tool for research and design applications related to concrete fire behavior. With appropriate input data pertaining to the thermal properties of various aggregate concretes as functions of temperature, the thermal response and/or fire resistance of concrete walls and slabs of any aggregate type and thickness can be predicted.As the emergence of performance-based design criteria gains momentum, established and accepted computer models will be crucial in evaluating the impact of performance-based fire codes and standards on concrete building design. Further testing of material properties of concrete at elevated temperatures—such as thermal conductivity, thermal diffusivity, and mass loss (water)—is needed if the maximum potential of this computer technology is to be realized.