EXPERIMENTAL PERFORMANCE OF REINFORCED CONCRETE HOLLOW COLUMNS EXPOSED TO FIRE
AbstractThis paper experimentally investigates the effect of high-temperature fire on the structural behavior of reinforced concrete hollow columns. Sixteen square (120Ã—120mm) columns were fabricated with 600mm length. The experiment's parameters were: the hollow size and the temperature of fire. Twelve specimens were cast with a hollow cross-section by inserting PVC pipes centrally along their length; these columns were categorized into three groups depending on the hollow diameters: 25.4, 50.8, and 76. 2mm. The remaining samples were solid and gathered in one group. Each group contained four samples; three of them were burnt at 300, 500, and 700 oC for one hour, and the fourth one was a reference not exposed to fire. All columns were tested under an axial compressive loading applied progressively up to the columnâ€™s collapse. The experiment results indicated that the collapse load of columns, having a same cross-sectional area, decreased with increased the temperature. The decline in columnsâ€™ strength ranged from 20.00% to 68.67% for specimens exposed to 300-700oC temperature, respectively. Additionally, for columns exposed to the same temperature, the collapse load descended as the hollow size augmented. A decrease of failure load varied from 21.86% to 65.38% for 25.4 to76.2mm hollow size columns, respectively. Finally, columns' stiffness reduced with increasing the temperature and the hollow size.
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