持载与干湿作用下CFRP-高强混凝土黏结性能研究

The bond behavior between high- strength concrete and CFRP under the sustained load and wet- dry cycles

为了给结构加固补强提供真实可靠的参考,考虑结构自身持续荷载作用及海水干湿循环作用,对CFRP与高强混凝土的界面黏结性能进行研究。利用5%浓度的Na Cl溶液模拟海水,利用发明的持载装置施加持续荷载,采用双面剪切试验方法对CFRP-高强混凝土的界面黏结性能变化规律进行分析。研究结果表明:随着干湿次数增加,界面破坏方式发生改变,黏结强度、剥离荷载、界面极限端部滑移逐渐降低;施加持续荷载作用将导致界面损伤加重,并加速界面破坏方式的转变速度。

In order to high strength concrete provide reliable reference for the reinforcement of building structures, the bond behavior of with CFRP was studied, considering the effect of wet - dry cycles and sustained load. The 5% NaCl solution was used to simulate seawater, and the self - designed loading device was adopted to apply sustained load. Based on this, the bond performance of high strength concrete with CFRP was analyzed with the doubled - sided shear test. The results indicate that with the increase of wet - dry cycles, the failure mode of interface alters and, the bonding strength, peel load and the terminal slip reduces gradually. Moreover, sustained load will aggravate interface damage and accelerate the transition speed of the failure mode of interface.