玄武岩纤维增强聚合物筋混凝土循环拉拔试验及预测模型OA北大核心CSTPCD

To explore the bonding behavior between the BFRP bars and concrete under dynamic loads,forward and re-verse cyclic pull-out tests were conducted on the BFRP bars,and their bonding dynamic performance was studied.Ac-cording to the experimental results,the bond stress-strain relationship curve shows that there is a bond behavior between the BFRP reinforcement and concrete under cyclic load,which undergoes four stages of stress characteristics as follows:elastic stage,crack propagation stage,crack closure stage,and friction stage;As the diameter of BFRP polymer bars in-creased,the bonding strength between the BFRP bars and concrete interface decreased.With an increase in the cycle number,the bond strength between the BFRP reinforcement and concrete decreased,the slip corresponding to the bond strength increased,the shear hysteresis area decreased,and the energy dissipation capacity decreased.Based on the ex-perimental results,a prediction model suitable for calculating the bonding performance between the BFRP bars and con-crete under cyclic loading was established,laying an experimental and theoretical foundation for the seismic and fatigue behaviors of the BFRP-reinforced concrete.