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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%。
Prestress loss analysis of carbon fiber sheet during tensioning and using is one of the key issues in prestressed CFRP reinforcement technology. On the basis of analyzing and summarizing existing reinforcement technology of prestressed carbon fiber, referring to GB 50010-2012 “Code for design of concrete structure”, the prestressing loss of prestressed carbon fiber reinforced concrete structure is calculated according to the item Calculation of stress loss. Based on the experimental study, it is suggested that the estimated prestress loss of the prestressed CFRP reinforced concrete structure be taken as 10% ~ 15% of the tension control stress.