FRP加固RC梁中部裂缝剥离破坏抗弯承载力简化计算方法

A Simplified Method for Calculating Flexural Capacity of FRP Strengthened Beams with Intermediate Crack Debonding

近几年,国内外众多学者对纤维增强聚合物塑料(FRP)加固钢筋混凝土梁的剥离破坏给予了极大的关注并进行了深入的研究,提出了若干研究剥离破坏的模型。对FRP端部剥离破坏提出了很多剥离破坏的承载力计算公式;但对于中部裂缝剥离破坏,多是对粘结界面的应力分布及应变分布进行了研究,现有的跨中裂缝剥离破坏承载力的计算公式很少并且是从复杂的强度理论为基础的。在阅读大量文献基础上,提出了基于能量原理的FRP加固钢筋混凝土梁跨中裂缝剥离破坏荷载的计算方法。

More and more attention has been paid to the debonding failure of reinforced concrete beams strengthened with fiber reinforced polymer（FRP）by many researchers home and abroad in recent years and a great number of experiments have also been made.Though a lot formulations for calculating the failure load of end debonding have been verifed,as for the intermediate cracking debonding,most of the researches are about the distribution of shear stress along the binding surface and the strain of FRP.According to the strength-based models few formulations have been put forward to calculate the carrying capacity of intermediate crack debonding.On the basis of a lot of references a simplified formulation based on the energy-based models has been put forward in this paper for calculating the flexural capability of strengthened beams with intermediate cracking debonding.