Abstract
This paper theoretically and numerically investigates the transient temperature distribution of steel cables. The effect of cavity radiation on the heat transfer through the air gap between steel wires of cables is taken into account. A simple calculation method is proposed based on the lump capacitance equilibrium to determine the temperature history in the center of steel cables. An equivalent parallel thermal resistance considering the cavity radiation and conduction is used to determine the total thermal resistance of wires. The accuracy of the proposed method is verified against numerical results from two-dimensional heat transfer analyses on cables with realistic cross sections under ISO834 fire. Parametric studies are conducted to investigate the effect of sectional dimension and cavity radiation on the temperature distribution of steel cables. The results show that the cavity radiation accelerates the heating rate of steel cables compared to round steel bar models. This indicates that it is not safe to directly use the traditional equivalent steel bar model to determine the temperature history of steel cables. It is found that the transient temperature distribution of steel cables is non-uniform. A higher central temperature of steel cables is achieved due to the cavity radiation effect compared to that of round steel bars. This temperature difference is also not monotonic and increases with increasing sectional dimension of cables.
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