中文摘要：

通过对8个高温后反复荷载下型钢混凝土短柱推出试验及3个高温后单调荷载下型钢混凝土短柱对比试验,研究高温后反复荷载下型钢混凝土的黏结退化性能。试验结果表明,高温后反复荷载下型钢混凝土短柱的推出破坏形态与单调荷载下的推出破坏形态基本相同。荷载-滑移滞回曲线偏向初始加载侧,加载过程中未出现类似钢筋混凝土荷载-滑移滞回曲线那样明显的'捏拢现象'。在其他条件相同的情况下,试件的极限承载力与黏结强度随升温时曾经经历最高温度的提高和最高温度持续时间的增长而降低,随型钢外围混凝土保护层厚度的增大而增大。反复加载会导致试件黏结强度的降低和滑移量的增大,升温时曾经经历的最高温度越高、最高温度持续时间越长,黏结强度与滑移刚度退化越明显。

英文摘要：

Eight steel reinforced concrete ( SRC) short columns after high temperatures under cyclic reversed loading and three comparative specimens under monotony loading were tested to investigate their performance of bond degeneration.Test results showed that the failure modes of SRC columns under cyclic reversed loading were almost the same as those under monotony loading.The load-slip hysteretic curve of SRC columns was biased to the initial loading side and had no pinching in the whole loading process, which was similar to that of RC short columns.In the same conditions, the bond strength and the ultimate bearing capacity of specimens decreased with the increased of the maximum temperature or the length time of the maximum temperature, and they increased with the increase of the thickness of the protective layer.Cyclic reversed loading would lead to a decrease in bond strength and an rease in slip.The bond strength and slip stiffness degenerated more obvious with the increase of the maximum temperature or the length time of the maximum temperature.