HB-FRP加固RC梁的精细有限元分析

Meso-scale finite element analysis of HB-FRP strengthened reinforced concrete beams

摘要:

为研究EB-FRP(externally bonded FRP)和HB-FRP(hybrid bonded FRP)加固梁的抗弯性能差异.基于3片室内模型梁的试验及精细化有限元数值模拟,选取了合适的材料模型,基于钝带裂缝模型,考虑钢筋与混凝土及FRP与混凝土的粘结滑移,对比分析试验数据,验证了数值有限元模型的有效性.结果表明:EB-FRP加固梁破坏形态为FRP端部剥离破坏,HB-FRP加固梁为剪切破坏；与未加固梁相比,HB-FRP加固梁承载能力比EB-FRP加固梁增加约20%；HB-FRP加固梁破坏时,FRP的强度完全发挥；钢扣件有效提高了FRP的抗剥离能力.

Abstract:

Flexural behavior of EB-FRP (externally bonded FRP) and HB-FRP (hybrid bonded FRP) strengthened RC beams is studied in this paper. Three beams test and finite element analysis was conducted. Basis on appropriate material model, blunt crack model, modelling of steel and FRP and their bond behavior, numerical finite element model is verified by comparing with model test results. The results show that failure mode of EB-FRP strengthened beams is plate end interfacial deboning. Failure mode of HB-FRP strengthened beams is shear failure. Compared with the beams without FRP strengthening, the flexural capacity increased by 20% for HB-FRP than EB-FRP. The FRP stress is about FRP strength for HB-FRP and steel fasters effectively prevent FRP deboning.