T形型钢混凝土柱火灾后抗震性能试验研究

Experimental Study on Seismic Behavior of T-shaped Steel Reinforced Concrete Columns After Fire

对3根火灾后和1根未受火的型钢混凝土T形柱进行拟静力加载试验,得出异形柱的滞回曲线、刚度退化曲线、延性系数等力学性能。试验结果表明:火灾损伤明显削弱异形柱的滞回性能,位移延性和耗能能力,降低了构件的屈服强度和极限承载力,加速了强度和刚度的衰减;配箍率的增加可显著改善构件的位移延性和滞回耗能能力,提高构件的承载力,延缓构件的刚度和强度退化;三折线模型仍适用于火灾后异形柱中。

Pseudo static loading tests were carried out on with T-shaped steel-reinforced concrete column which three columns were after fire and one was without fire. The hysteretic curves, stiffness degradation cmwe, ductility coefficient and other mechanical properties are obtained. The test results show that the fire damage weakens column hysteretic behavior displacement ductility and energy dissipation capacity significantly, reduce component yield strength and ultimate strength, speed strength and stiffness attenuation. Increasing stirrup ratio can modify the displacement ductility and hysteresis energy consumption ability significantly, it also can improve the bearing capacity of member and slow component degradation of stiffness and strength. Three-line model is still suitable for special-shaped column after fire.