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为研究纤维增强复合材料(FRP)约束混凝土圆柱的损伤机理,进行4组FRP约束混凝土圆柱和2组无约束混凝土圆柱共18个试件的轴压试验,借助声发射技术探测试件加载全过程的损伤信号.结果表明:无约束混凝土试件破坏属于脆性破坏,而受约束混凝土试件破坏属于延性破坏.根据FRP约束混凝土圆柱的受力特点和破坏过程将其分为主动承载阶段和被动承载阶段.在此基础上,提出计算该类构件极限强度的修正公式.该公式物理意义明确,而且具有较高的计算精度.
In order to study the damage mechanism of concrete columns restrained by fiber reinforced composites (FRP), the axial compression tests of 18 specimens with four groups of FRP confined concrete columns and two groups of unconstrained concrete columns were carried out. Through acoustic emission technique, The results show that the failure of unrestrained concrete specimen belongs to brittle failure and the failure of the restrained concrete specimen belongs to the ductile failure.According to the mechanical characteristics and failure process of FRP confined concrete cylinder, it is divided into active loading stage and passive loading On this basis, a formula for calculating the ultimate strength of this type of component is proposed, which has a clear physical meaning and a high computational accuracy.