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【提要】 碳纖維布施加預應力后粘貼加固可有效改善混凝土梁正常使用階段的工作性能，相應
截面應力和抗彎剛度分析對于合理評價加固梁的工作狀態(tài)有重要意義。根據(jù)預應力碳纖維布
加固混凝土梁正常使用階段的截面受力分析，提出了截面應力的簡化計算方法，進而通過引
入碳纖維布應變不均勻系數(shù)，得出了對于未加固梁、非預應力碳纖維布加固梁和預應力碳纖
維布加固梁均適用的截面短期抗彎剛度的實用計算方法。試驗結果對比表明，建議的截面應
力和抗彎剛度計算方法準確度較高。
【關鍵詞】 預應力 碳纖維布 加固 混凝土梁 應力 抗彎剛度
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)中外建華誠城市建設有限公司，北京，100085；2)清華大學土木工程系結構工程與振動教
育部重點實驗室，北京，100084；3)中冶集團建筑研究總院，北京，100088。