预应力碳纤维板加固混凝土结构预应力损失研究

STUDY ON PRESTRESS LOSS OF CONCRETE STRUCTURE STRENGTHENED WITH PRESTRESSED CFRP PLATES

碳纤维板在张拉及使用阶段的预应力损失分析是预应力碳纤维板加固技术的关键问题之一。在分析总结现有预应力碳纤维加固工艺的基础上,借鉴GB 50010—2012《混凝土结构设计规范》,对预应力碳纤维板加固混凝土结构产生的预应力损失分项进行计算,并给出各项预应力损失的计算方法。在试验研究的基础上,建议预应力碳纤维板加固混凝土结构的预应力损失估算值取为张拉控制应力的10%～15%。

Analysis of prestress loss of concrete structure strengthened with prestressed CFRP plates in tension and using stage is one of the key problems of prestressed CFRP plate technology.Based on the analysis and summary for the existing reinforcement technology of prestressed CFRP plates,using our current Code for Design of Concrete Structure for reference,separately calculate the prestress loss of CFRP plates used to strengthen concrete structures,and present the calculation method of every prestress loss.The estimated value for prestress loss of concrete structure strengthened with prestressed CFRP plates is suggested to be 10%～15% tension control stress based on test.