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CFRP板端应力集中导致的剥离破坏是加固梁破坏的主要形式之一。该文对CFRP板加固梁中的界面应力进行了推导,给出了考虑外荷载、温度变化和预应力等作用的界面应力计算公式,并对板端的最大界面应力计算进行了简化。对CFRP板施加预应力采用了预应力FRP法和梁反拱预应力法。通过算例及参数分析,讨论了不同工况(包括外荷载作用、温度变化、预应力作用等)下的界面应力及CFRP板纵向力。结果显示,采用预应力FRP法和温度的升高显著增加了加固梁的界面应力集中,而梁反拱预应力法引起的界面应力集中相对较小。另外,CFRP板的长度对预应力FRP法引起的最大界面应力没有影响,但梁反拱预应力法引起的最大界面应力随板长增加而减少。而各种工况下的最大界面应力均随板厚度的增加而增加。
The peeling failure caused by stress concentration on the CFRP board is one of the main forms of failure of the reinforced beam. In this paper, the interface stress in reinforced beams of CFRP board is deduced. The formulas for calculating the interface stress considering the effects of external load, temperature change and prestressing are given, and the calculation of maximum interface stress at the board end is simplified. Prestressed CFRP board using prestressed FRP method and beam anti-arch prestress method. Through the analysis of examples and parameters, the interface stress and the longitudinal force of CFRP plate under different working conditions (including external load action, temperature change, prestressing action) are discussed. The results show that the prestressed FRP method and the temperature increase significantly increase the stress concentration of the interface of the reinforced beam, while the interfacial stress concentration caused by the beam reverse arch prestressing method is relatively small. In addition, the length of the CFRP plate has no effect on the maximum interfacial stress caused by the prestressed FRP method, but the maximum interfacial stress caused by the inverse arched prestressing method decreases with the increase of the plate length. The maximum interfacial stress under various conditions increases with the increase of plate thickness.