A New Fire-Resistance Test Method for a Reinforced Concrete Truss

Abstract

An innovative technology relates to the field of buildings and structures fire safety (hereinafter Buildings). In particular, we can use this technology to classify reinforced concrete trusses according to their resistance to fire. This provides an opportunity to reasonably use trusses with actual fire-resistance of buildings with various fire hazard classes. A summary of the innovative technology is to test tensile and compressive elements of a reinforced concrete truss under fire conditions without destruction according to a set of simple quality factors. The resistance procedure of load-carrying elements of the reinforced concrete truss to standard fire exposure is represented by mathematical dependences that take into account the integral heat engineering and design parameters, as well as the features of tensile and compressive elements reinforcement. The new method application makes it possible to determine the actual fire-resistance of tensile and compressive elements of the reinforced concrete truss without actual heat exposure; increases the reliability of non-destructive tests; makes test conditions of tensile and compressive elements closer to the actual operating conditions. The fire-resistance of the reinforced concrete truss determines the resistance limit to fire exposure of the weakest element.