Abstract
Methods to predict the temperature field of a steel-concrete composite structure under fire conditions have been developed using different mathematical techniques. But, one of the drawbacks of these approaches is ignoring the effect of thermal contact resistance at the steel-concrete interface. The main object of the research in this article is the thermal contact resistance at steel-concrete interface of concrete-filled steel tubular (CFST) columns with circular cross-section. In order to obtain the temperature field of the columns under fire conditions, two circular steel tubes filled with normal weight concrete were used to measure the temperatures at some selected points. To obtain the solution of the governing equation for one-dimensional transient heat conduction problems by applying Laplace transformation and inverse Laplace transformation, the selected points temperatures are described as polynomial series or piecewise polynomial series of time. According to Fourier's law and Newton's law of cooling, the thermal contact resistance is obtained. The temperatures calculated for some representative problems show good agreement with the experimental results. The proposed approach can be applied to predict the thermal contact resistance.
Published Version
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