【摘要】 GFRP筋-UHPC构件拥有优异的力学性能和耐久性，具有广阔的应用前景。GFRP筋在UHPC中的粘结性能是两种材料协同工作的关键。分别对12个和4个GFRP筋-UHPC试件进行了单调和低周循环加载，研究表面处理方式、粘结长度和周期加载对破坏模式、粘结强度等力学性能的影响。试验结果表明，所有试件均发生了GFRP筋拔出破坏；相比表面喷砂试件，绕线试件的粘结应力-滑移曲线在应力峰值后具有更明显的上下波动现象；粘结强度随着粘结长度的增加略有减小；带肋试件的粘结强度比喷砂试件略高；低周循环加载对GFRP筋在UHPC中的粘结性能影响不大。最后，通过修正Yoo学者的粘结强度模型，得到了考虑GFRP筋表面特征的粘结强度预测公式。更多还原

【Abstract】 GFRP bar-UHPC members have excellent mechanical property and durability, and have wide application prospects. The bond performance between GFRP bars and UHPC is a key issue for the two materials to work together. Pull-out tests were carried out on 12 and 4 GFRP-bar-UHPC specimens under monotonic and low-cyclic loading respectively to study the effects of GFRP bars’ surface treatment, bond length and cyclic loading on mechanical properties such as failure mode and bond strength. The results showed that all specimens exhibited pulling-out failure. The bond stress-slip curves of wire wrapping GFRP bars specimens exhibited more significant fluctuations up and down after the peak load. The bond strength between GFRP bars and UHPC decreases slightly with the increase of bond length. The bond strengths of wire wrapping GFRP bars specimens were higher than these of sand coated specimens. Meanwhile, the effect of low-cycle loading on the bonding properties of GFRP bars in UHPC was mild. Finally, based on a model proposed by Yoo, a bond strength prediction model considering surface features of the bar has been proposed.更多还原