Comparative Study on Calculation Methods of Temperature Field of Mass Concrete Structures in Subway Stations

When constructing the mass concrete temperature field, because the third type of boundary condition is difficult to deal with mathematically, the equivalent surface heat dissipation coefficient method or the equivalent thickness method is generally used for approximate processing in actual engineering. Based on different calculation methods, this study uses ABAQUS finite element software to establish three temperature field calculation models adds the concept of equivalent age, and compares and analyzes the error between the simulation results and the measured temperature. The calculation results show that after considering the equivalent age, the model of completely restoring the concrete surface insulation layer is the closest to the measured results, followed by the equivalent surface heat dissipation coefficient method; at the same time, both the simulation results and the measured results reflect that the concrete surface covering Insulation materials can effectively control the temperature difference between inside and outside.