预应力碳纤维布加固混凝土梁承载力影响因素及抗弯刚度计算分析

Calculation and analysis of bearing capacity influencing factors and flexural stiffness for pre-stressed CFRP reinforced concrete beam

碳纤维布加固是近年来在混凝土结构上应用较广泛的加固技术,而预应力碳纤维布加固比普通碳纤维加固更加有效和实用,本文首先从多种角度出发,利用抗弯承载力公式计算结果,对可能影响二次受力下预应力碳纤维布加固混凝土梁承载力的因素进行分析,然后结合预应力混凝土梁刚度计算公式,推导出正常使用阶段预应力碳纤维布加固混凝土梁刚度及挠度计算公式,并把计算值与试验值进行对比验证,证明了其科学性,可为实际工程提供一定的理论参考。

CFRP reinforcement method is a widely applied reinforcement technology in concrete structure in recent years,and pre-stressed CFRP reinforcement method is more effective and practical than ordinary CFRP reinforcement. From different perspectives,flexural bearing capacity formula was used to calculate results. And the factors that may affect the bearing capacity of concrete beamreinforced by pre-stressed CFRP under secondary load condition were analyzed.Combined with pre-stressed concrete beam stiffness calculation formula,calculation formulas for stiffness and deflection of concrete beam reinforced by pre-stressed CFRP during normal use stage were derived. The calculated results were compared with the experimental results to verify itsscientificalness,which can provide certain theoretical reference for practical engineering.