ABSTRACT
Compared with traditional cast-in-place concrete structures, prefabricated concrete structures are more widely used because they have shorter construction period and are more friendly to the environment. Usually, longitudinal reinforcement at member joints is connected by the sleeve grouting method. However, various types of construction defects often occur during the construction. According to the types of defects that often occur in actual construction, three types of specimens were designed in this paper, namely anchorage length defects, longitudinal eccentricity defects and longitudinal grouting defects. Uniaxial tensile tests were conducted on eight specimens of the three types, test data such as ultimate load and corresponding displacement were obtained. The test results showed that the damage modes were divided into reinforcement tensile failure and reinforcement pull-out failure, most of the specimens with defects were reinforcement pull-out failure. The anchorage length defects, longitudinal eccentric defects and longitudinal grouting defects have some influence on the bearing capacity of the specimens, among which the eccentric defects have the greatest influence on the bearing capacity. Defects can cause an increase in bond stress when the specimen reaches the yield point. The bond stress of the anchorage length defect specimen is significantly greater than that of other defect specimens. The bond stresses for eccentric defect specimens and longitudinal grouting defect specimens are slightly higher than those for non-defective specimens. Moreover, different defects can lead to increased strains in the reinforcement. The results of the study provide a reference for future construction plan improvement and numerical simulation of the mechanical properties of grouted sleeves with defects.
