NUMERICAL SIMULATION ANALYSIS OF TEMPERATURE FIELD OF BOX-TYPE COMPOSITE WALL

The spatial and temporal characteristics of the internal temperature field of the box-type composite wall have great significance to high temperature mechanical response and fire resistance performance of composite wall subjected to fire. A series of assumptions for the simplified model were made after determining the influence of various thermal parameters, the boundary conditions of surface and the contact conditions. And the finite element software(ABAQUS) was used to establish the temperature field analysis model to conduct nonlinear transient temperature response analysis, then the validity of the model was verified by relevant test results. On this basis, the distribution of temperature field during the whole process and its key measuring points under fire are analyzed, and the parameters of each component are researched. The results show that the thickness of rock wool, the type, the thickness and number of layers of cladding plates have obvious influence on the temperature field distribution inside the composite wall, and other factors have little effect. According to the analysis results, the fire-resistant design idea of the composite wall and the temperature prediction formulas of the key temperature-control point are proposed, which provide the basis for the application of the boxtype steel structure system.