【提要】 碳纤维布施加预应力后粘贴加固可有效改善混凝土梁正常使用阶段的工作性能，相应
截面应力和抗弯刚度分析对于合理评价加固梁的工作状态有重要意义。根据预应力碳纤维布
加固混凝土梁正常使用阶段的截面受力分析，提出了截面应力的简化计算方法，进而通过引
入碳纤维布应变不均匀系数，得出了对于未加固梁、非预应力碳纤维布加固梁和预应力碳纤
维布加固梁均适用的截面短期抗弯刚度的实用计算方法。试验结果对比表明，建议的截面应
力和抗弯刚度计算方法准确度较高。
【关键词】 预应力 碳纤维布 加固 混凝土梁 应力 抗弯刚度
Analysis on Stress and Shortterm Flexural Stiffness of Strengthened RC Beam Pr
estressed with CFRP Sheets/Zhang Ke1,Ye Lieping2,Yue Qingrui3 (1 C
CI Urban Construction & Development Co.,Ltd.,Beijing 100085,China; 2 Department
of Civil Engineering,Key Lab of Structural Engineering and Vibration Education M
inistry Tsinghua University,Beijing 100084,China; 3 Central Research Institute o
f Building and Construction of MCC group,Beijing 100088,China)
Abstract:The behavior of RC beams strengthened with prestressed CFRP sheets under service loading can be improved effectively. The stress and shortterm stiffness
of the Strengthened RC Beam Prestressed with CFRP Sheets have attracted more and
 more attention. A method to determine section stress of strengthened beam with p
restressed CFRP sheets under service loading is put forward,furthermore,by int
roducing coefficient of nonuniformity of longitudinal CFRP strain between crac
ks,the shortterm flexural stiffness of strengthened beam is also studied and a
 unified model suitable for RC beams and strengthened RC beams with pretressed a
nd nonpretressed CFRP sheets is proposed. The calculated results of suggested
method are compared and shown to agree well with the test results.
Keywords:prestressed; CFRP sheets; strengthening; concrete beam; stress; stiffness
1)中外建华诚城市建设有限公司，北京，100085；2)清华大学土木工程系结构工程与振动教
育部重点实验室，北京，100084；3)中冶集团建筑研究总院，北京，100088。