Experimental Analysis of the Sectional Temperature Distribution of CFST under Variable Temperature Effect

The concrete filled steel tubular (CFST) structure takes full advantages of the interaction of two materials in the process of loading, while the thermal performance parameters between steel tube and concrete are different, and the outside temperature changes makes the structural section produce a greater temperature gradient, which leads to the uncoordinated deformation between them. In this paper, the thermal conductivity of experimental system is carried on the theoretical analysis, then the distribution regularities of sectional temperature are obtained through the testing its of CFST under variable temperature effect, and the larger temperature difference will produce the temperature stress, which affects the bonding performance of structural interface. So in order to better analyze the influence which is impacted on the mechanical performances of structure by the combination effect of multiple factors such as temperature and load, such paper can provide the theoretical and experimental foundation.