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预应力CFRP布加固RC箱梁受到预应力及外荷载共同作用时,其界面粘结剪应力可由预应力单独作用阶段和外荷载作用阶段两者叠加而得.基于破坏力学概念,对预应力单独作用阶段界面剪应力传递情况进行分析,推导了界面剪应力计算公式,并通过有限元对CFRP布加固RC箱梁做了数值实验验证,探讨了初始预应力大小、CFRP布厚度和CFRP布弹性模量对界面剪应力的影响.
When prestressed CFRP sheet reinforced RC box girder subjected to prestress and external load, the interfacial shear stress can be obtained by superposing the prestressing single stage and the external load acting stage respectively.Based on the concept of failure mechanics, The interface shear stress transfer is analyzed and the interface shear stress formula is deduced. The finite element method is used to verify the RC box girder reinforced with CFRP sheet. The initial prestressing force, CFRP thickness and CFRP elastic modulus Influence of quantity on interfacial shear stress.