Dynamic testing of prefabricated concrete frame hook-type joints

Abstract

A new type of prefabricated concrete beam-column hook-type joint with simple structure and convenient installation was proposed. In order to comprehensively evaluate the dynamic behaviour of a newly hook-type joint, dynamic tests were carried out on five full size model specimens with different strength grade of concrete and steel bar. The seismic behavior parameters such as failure pattern, bearing capacity, and hysteresis loop and ductility coefficient of each specimen were analyzed, and the strain distribution of post-pouring band were studied. Experiment results show that the destruction process of prefabricated concrete hook-type joints has the initial crack, through crack, beam yield, limit, and destroyed stages. The hysteretic loop is plump and has good plastic deformation ability, and the ductility coefficients are above 3.5, which indicate that the hook-type joints have good ductility. The analysis results shows that the steel bar strains in the post-pouring band continue to increase steadily after the joints yield, which means it has good working performance. Therefore, the hook-type joint of the prefabricated concrete frame have good seismic performance and reliability.