Numerical solution of the thermal problem for electric heating of concrete structures in winter

摘要

This paper presents the results of a numerical solution of the thermal problem for electrical heating of a monolithic reinforced concrete raft foundation in the ELCUT Pro software and computing system. The purpose of this work was to solve a thermodynamic problem in the case of electric heating of concrete of a monolithic raft foundation with insulated heating wires in the winter. The foundations of an industrial building under construction in Tomsk are taken as a basis. The relevance of these studies in construction is caused by the need to ensure the temperature conditions necessary for the hardening and strength of concrete in the winter. The initial parameters for the concrete structure being built were entered in the Elcut Pro software package with the WinConcret add-in. As a result of the calculation, the optimal step of winding insulated heating wires on the reinforcing cage was determined, which leads to a uniform distribution of temperature fields over the section of the structure. The analysis of the temperature field in the section of the structure was carried out. Technological measures were developed that level this field and at the same time ensure a favorable temperature of concrete hardening, which is the main task of thermal calculation. Based on the simulation results obtained in the Elcut Pro software package, a technology has been developed for electric heating of concrete foundations at negative temperatures, which has been implemented in the conditions of a construction site.