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
Bond-slip behavior and model prediction of fiber-reinforced polymer-reinforced concrete
柴松华 1杜红秀 2吴凯 2黄锐 3周驰词3
作者信息
- 1. 运城职业技术大学建筑工程学院,山西 运城 044000
- 2. 太原理工大学土木工程学院,太原 030024
- 3. 四川省公路规划勘察设计研究院有限公司,成都,610041
- 折叠
摘要
为探究动荷载下玄武岩纤维增强聚合物(BFRP)筋与混凝土的黏结行为,开展了BFRP筋混凝土正反向循环拉拔试验,对其黏结动力性能进行分析.结果表明,从黏结应力-滑移关系曲线揭示,循环荷载下BFRP筋与混凝土黏结行为经历4个阶段的受力特征:弹性阶段、裂缝扩展阶段、裂缝闭合阶段和摩擦阶段;随 BFRP 聚合物筋直径的增大,降低了BFRP 筋-混凝土界面的黏结强度;随循环次数的增加,BFRP筋与混凝土的黏结强度减小,黏结强度对应的滑移量增加,剪切滞回面积减小,耗能能力降低;基于试验结果,提出了适用于计算循环荷载下BFRP筋与混凝土黏结性能的预测模型,从而为BFRP筋混凝土抗震和疲劳行为奠定试验和理论基础.
Abstract
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.
关键词
玄武岩纤维聚合物筋混凝土/黏结特性/循环拉拔试验/滑移/滞回面积Key words
basalt fiber-reinforced polymer reinforcement concrete/bonding characteristics/cyclic pull-out test/slip/hysteresis area引用本文复制引用
基金项目
国际(地区)合作与交流项目(41761144080)
四川省科技厅重点研发项目(2020YFS0361)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据