Seismic Performance of Concrete Beam-Column Joint

This study proposes a new type of non-porous grouting sleeve connection technology for the problems of insufficient grouting compactness and clogging that exist in the traditional grouting sleeve connection.The seismic performance of prefabricated and cast-in-place beam-column joints was analyzed by comparison with ABAQUS numerical simulation, and the results showed that: the ductility coefficients of the two types of joints were more than 3 and the hysteresis curve pattern and skeleton curve characteristics were basically the same, the bearing capacity and cumulative energy consumption of the assembly joints were lower than that of the cast-in-place joints by 6%-7% and 8.7%, respectively, but the overall mechanical properties were comparable.The damage process showed a shear damage mode with vertical cracks at the beam end expanding to the core of the joint, and the concrete spalling triggered the slip of reinforcement leading to the reduction of the load carrying capacity.The study suggests that the seismic performance can be effectively improved by optimizing the axial compression ratio (lowering it can improve the energy-consuming capacity, while too high accelerates the stiffness degradation), adopting 500 MPa-grade longitudinal reinforcement (improving the load carrying capacity by 5.8%), and high-performance grouting to strengthen the anchorage measures, combined with the regular inspection and maintenance of the joint area during the construction stage.The finite element simulation verified the mechanical properties of the joints, and the peak load error of forward and reverse loading was less than 5% and 10.7%, respectively, which provided a solution with both reliability and engineering applicability for the seismic connection of prefabricated structures.