Experimental and analytical investigation into the stress performance of composite anchors for CFRP tendons

This paper presents a study of the internal stress distribution and its stress transfer mechanism of composite anchors for carbon fiber-reinforced polymer (CFRP) tendons. One set of static tensile test for composite anchor was introduced and carried out. Three zones designated as tension zone, holding zone and compression zone respectively were divided to analyze the stress distribution separately based on some assumptions. Test and analysis results show that the tensile stress and its variation on the steel tube surface will reflect the internal stress distribution of composite anchor. Peak tensile stress exists in the tension zone test points indicates the bonding failure occurs between adhesive and CFRP tendons. The radial clamping action of wedge could effectively enhance the anchoring effect. The obvious decrease of stress curve in the compression zone indicates the bonding damage of entire composite anchor occurs.