MATHEMATICAL MODEL OF STEEL TUBE CONFINED CONCRETE PILLAR HEATING IN CONDITIONS OF FIRE

Abstract

The method of determining the temperature field and its changes in time by heating the pillar in conditions of standard temperature mode, taking into account changes of physical and mechanical properties of concrete and metal, was developed. Mathematical modeling of heat transfer between the environment and steel tube confined concrete pillar in case of fire was made. The time of reaching the critical temperature by the steel ferrule was predicted using the finite elements metod. Unsteady temperature field inside STCC pillar (concrete-steel core ferrule) was explored in conditions of standard temperature mode. The pillar was modeled as a two-layer cylinder. The research results were presented graphically.