钢板与预应力碳纤维布组合加固RC梁抗弯承载力分析  

Analysis of resisting flexural strength of RC beams strengthened with steel plates and prestressed CFRP Sheets

作　　者：康俊涛[1] 马雷 张亚州[1] 秦世强[1] 曹鸿猷[1,2] KANG Juntao;MA Lei;ZHANG Yazhou;QIN Shiqiang;CAO Hongyou(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Department of Civil&Environmental Engineering,National University of Singapore,Singapore 119077,Singapore)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070 [2]新加坡国立大学土木与环境工程系,新加坡119077

出　　处：《中山大学学报（自然科学版）》2018年第2期94-101,共8页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金(51608408)

摘　　要：为了解决钢筋混凝土梁抗弯承载力降低的问题,提出了一种将钢板锚固于钢筋混凝土梁底部,碳纤维布施加预应力后粘贴于钢板上,实现对梁进行的组合加固的新方法;推导出了组合加固梁在适筋破坏范围内的正截面承载力计算公式。并将计算结果与相关文献的试验数据进行了对比,发现:1)理论计算值与相关文献试验值较为接近,试验中梁的破坏模式与和理论预测的破坏模式基本吻合;2)相对于单一粘贴碳纤维布加固梁,组合加固梁的极限弯矩提高了37.4%~57.1%,屈服弯矩提高了60.4%~95.7%;3)相对于单一粘贴钢板加固梁,组合加固梁的极限弯矩提高了25.4%~39.7%。因此,钢板与预应力碳纤维布组合加固技术可有效提高梁的抗弯性能。In order to solve the problem of the decrease of flexural capacity of reinforced concrete(RC)beams,this paper proposes a new approach of steel plate-CFRP composite reinforcement:the steel plates are anchored at the bottom of the reinforced concrete beam,and carbon fiber reinforced polymer(CFRP)sheets are pasted on the steel plates after having been prestressed.The calculation formula for normal section flexural capacity of the composite reinforcement beam in balanced-reinforced failure is derived,and the results got by the calculation formula are compared with the test results in relevant literature.The results show that theoretical value is close to test value of relevant literature,the failure modes of beams in the test are consistent with predicted failure modes.Compared with the prestressed CFRP sheet reinforcement,the values of ultimate moment of RC beams strengthened with prestressed CFRP sheets and steel plates increase 37.4%~57.1%,the values of yield moment increase 60.4%~95.7%;Compared with the steel plate reinforcement,the values of ultimate moment increase 25.4%~39.7%.It shows that steel plate-CFRP combination reinforcement technology improves flexural behavior of RC beams effectively.

关 键 词：桥梁工程 预应力碳纤维布 钢板 组合加固 抗弯承载力 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]