Abstract
This paper presents the results of a fire testing program of four concrete filled circular hollow section columns with solid steel core. The structural fire behaviour is analysed by means of the recorded deformation–time as well as temperature–time course. Thereby it is shown, that after the temperature induced failure of the tube, the load is redistributed to the core. Depending on the pre-loading level, these columns can subsequently sustain the load with a bounded rate of deflection, until runaway failure occurs when the temperature induced stiffness degradation of the core sets in. A three-dimensional FEM model is validated with one of the fire tests and the influence of the support conditions, the eccentricity of the load and the input data of the constitutive model of the steel core are studied.
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