考虑残余应变的FRP抗弯加固梁计算方法

Calculation method of RC beam flexural strengthened with FRP considering the influence of preexisting strain

部分学者在他们的研究中指出了残余应变对FRP加固效能影响这一现象,但未就此进行定量的试验研究与分析.文中理论推导了考虑残余应变的FRP抗弯加固梁所需FRP用量的计算方法.分析表明,不考虑结构残余应变影响将使计算所需FRP加固量变小,在一定程度上难以达到预期加固效果.部分结论可供工程人员参考.

Some researchers in their study point out that the preexisting strain has great influence on the flexural performance of FRP strengthened girder, but there is a lack of quantificational test and analysis. The flexural calculation method for FRP strengthened girder is deduced which considers the influence of the preexisting strain. It can be seen from the calculation formula that the FRP quantity without considering the preexisting strain influence cant meet the flexural strengthening need. The calculation method can be a reference for some engineers.