【摘要】 在汶川地震中大批框架节点受损破坏,亟需找一种方法对这些节点进行加固修复。为此,设计制作了4个3维钢筋混凝土框架节点进行试验,研究外包钢套法加固震损节点的抗震性能。试验流程为先对框架节点进行预震损,然后进行裂缝修补和外包钢套法加固,最后进行低周反复破坏试验。结果表明,加固后的框架节点由"弱柱强梁"转变为"强柱弱梁"的破坏形式。由对节点的滞回曲线、骨架曲线、延性系数等参数的分析可知:外包钢套法可以显著提高节点刚度,延性等抗震性能。通过外包钢套加固,预震损节点的承载力和抗震性能恢复并超过了节点预震损前的承载力和抗震性能。更多还原

【Abstract】 A large number of column-beam joints(C-BJ) have been damaged in the Wenchun earthquake.Thereby a proper method is urgently needed for strengthening the damaged joints.This paper presented the experimental study on the seismic behaviors of 4 repaired C-BJs,2 of which had been pre-damaged under cyclic loads.The test procedure included pre-damage,rehabilitation and re-test under cyclic loads.The test results showed that the failure mode of strong beam and weak column changed into strong column and weak beam after rehabilitations.The analysis of the hysteresis curves,ductility,and skeleton curves showed that the method of enveloped steel has significant improvements in both the stiffness and all aspects of seismic performance.The study indicated that the repaired C-BJs can reach or even exceed the level of their original seismic performance before pre-damage.更多还原