常温及火灾后型钢混凝土梁柱节点加固试验研究  

Experimental study on performance of SRC beam-column joints strengthened by CFRP under normal temperature and after exposure to fire

作　　者：裘哲俊 李俊华[1] 池玉宇 孙彬[2] 

机构地区：[1]宁波大学建筑工程与环境学院,宁波315211 [2]中国建筑科学研究院,北京100013

出　　处：《建筑结构》2017年第9期33-39,共7页Building Structure

基　　金：国家自然科学基金项目(51178226);浙江省自然科学基金项目(LY14E080003)

摘　　要：通过1个火灾后碳纤维加固型钢混凝土梁柱节点试件和1个碳纤维加固常温下未受火型钢混凝土梁柱节点试件的低周反复加载试验及2个常温下及火灾后未加固节点的对比试验,研究碳纤维加固对常温下及火灾后型钢混凝土梁柱节点抗震性能修复的有效性。结果表明:火灾后型钢混凝土梁柱节点的承载力和刚度降低、延性系数减小。所采用的碳纤维加固方法能有效提高常温下及火灾后型钢混凝土梁柱节点的承载力与延性,加固后试件的滞回曲线更加饱满,变形能力增强,极限荷载后的强度和刚度退化减缓,抗震性能的修复效果显著。One steel reinforced concrete （SRC） beam-column joints after exposure to fire, together with another SRC beam- column joint under normal temperature strengthened by CFRP, and the other two comparative specimens without strengthened were tested under cyclic reversed loading to research the strengthening effectiveness by CFRP on seismic performance of SRC beam-column joints under normal temperature and after exposure to fire. Test results show that the load bearing capacity and rigidity, as well as ductility coefficient of SRC beam-column joints are all declined sharply after exposure to fire. The proposed strengthening method can enhance the load bearing capacity and ductile performance of SRC beam-column joints under normal temperature and after exposure to fire remarkably. Specimens strengthened by CFRP according to the proposed method have plumper hysteresis loops, stronger deformation ability, more slowly degeneration speed on strength and rigidity, and significant repair effect of seismic performance.

关 键 词：型钢混凝土 梁柱节点 火灾后 碳纤维 加固 

分 类 号：TU398[建筑科学—结构工程]