GFRP筋与珊瑚混凝土黏结性能的试验研究

摘要

For want of research on the bonding behavior between glass fiber reinforced plastic(GFRP) bars and coral concrete,which affects the structural calculation and performance analysis,experimental study on the bond behavior between GFRP bars and coral concrete was carried out.The stress process and bond slip curve of GFRP bars and coral concrete were analyzed,and the influence of the relative thickness of cover layer,bond length,characteristics of the coral concrete and other factors on the bond strength were also analyzed.The results show that the bond strength of GFRP bars and coral concrete can meet the general engineering needs.The bond process,characteristics of bonded slip curve,bond mechanism and failure modes of GFRP bars and coral concrete are similar to those of GFRP bars and ordinary concrete.Among the influencing factors,the bond length,relative thickness of cover layer,the diameter and surface condition of GFRP bars have great influence on bond strength and failure modes.%针对玻璃纤维增强塑料(GFRP)筋与珊瑚混凝土间的黏结行为研究较少,进而影响到相关结构计算及性能分析等问题,开展了GFRP筋与珊瑚混凝土黏结性能的拉拔试验研究,分析了GFRP筋与珊瑚混凝土黏结破坏的受力过程和黏结-滑移曲线特征,以及相对保护层厚度、黏结长度和珊瑚混凝土材料特性等因素对GFRP筋与珊瑚混凝土黏结强度的影响.结果表明:GFRP筋与珊瑚混凝土的黏结强度能够满足一般工程需要,GFRP筋与珊瑚混凝土黏结破坏的受力过程、黏结-滑移曲线特征、黏结机理、破坏形态与GFRP筋-普通混凝土的黏结行为较为接近;各影响因素中,黏结长度、相对保护层厚度、GFRP筋直径及表面状况对GFRP筋与珊瑚混凝土黏结强度及破坏形态影响较大.