跨中顶撑预应力碳纤维增强复合材料板加固钢筋混凝土梁的试验研究  

Experimental Study on Strengthening RC Beams with Mid-Span Supporting Prestressed Carbon Fiber Plates

作　　者：刘斌[1] 王虎胜 杨家琦 冯鹏[2] 张启睿 粟登洋 汪城 LIU Bin;WANG Husheng;YANG Jiaqi;FENG Peng;ZHANG Qirui;SU Dengyang;WANG Cheng(China University of Mining and Technology(Beijing),Beijing 100083,China;Tsinghua University,Beijing 100084,China)

机构地区：[1]中国矿业大学(北京),北京100083 [2]清华大学,北京100084

出　　处：《工业建筑》2023年第3期21-28,共8页Industrial Construction

基　　金：国家自然科学基金青年项目(51908322);中央高校基本科研业务费(2021XJLJ01);中国矿业大学(北京)越崎杰出学者奖励计划项目(2602021RC59)资助。

摘　　要：针对预应力碳纤维增强复材(CFRP)板加固钢筋混凝土梁开展了一系列试验研究,对比了现有的外贴预应力加固法和新型跨中顶撑张拉加固法对未损伤梁及损伤梁的加固效果。试验结果表明,新型跨中顶撑张拉加固法可有效提升被加固混凝土梁的开裂荷载和极限承载力,开裂荷载最大提升100%,承载力最大提高48%,均优于传统的外贴预应力加固法。同时,新型加固方法实现了较好的延性,使得用高强弹脆性材料加固的混凝土梁在受弯中产生了较长的屈服平台,为进一步研究高性能材料在结构中的应用提供了参考。A series of experimental tests on prestress CFRP plate strengthened RC beams were conducted.The strengthening effect on undamaged beam and damaged beam of two types of strengthening methods,i.e.,externally bonded prestressed CFRP and novel mid-span supporting prestressing technique,were investigated.The test results show that the novel strengthening method can enhance both cracking load and ultimate load effectively.The cracking load was enhanced by up to 100%,and the ultimate strength was increased by up to 48%,which had higher efficiency than the conventional method.In addition,the RC beam strengthened by the novel prestressing method had good ductility with a long yield plateau when subjected to bending.Hence,this is a valuable reference for further application of high-performance material in structural engineering.

关 键 词：预应力 碳纤维增强复材 混凝土梁 加固 

分 类 号：TU375.1[建筑科学—结构工程]