外包钢套法加固钢筋混凝土框架节点试验研究  

Experimental Study on the Seismic Performance of Enveloped Steel Strengthened RC Frame Joint

作　　者：陆洲导[1] 刘长青[1] 张克纯[1] 王焕杰[1] 

机构地区：[1]同济大学结构工程与防灾研究所,上海200092

出　　处：《四川大学学报（工程科学版）》2010年第3期56-62,共7页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(50778134);高等学校博士学科点专项科研基金资助项目(200802471089)

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。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.

关 键 词：地震 损伤 3维框架节点 修复 外包钢套 抗震性能 

分 类 号：TU357.4[建筑科学—结构工程] TU317.1