Experiments on hysteretic behavior of assembled joint with precast concrete-filled steel tube core-beam end energy dissipation
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Abstract:
In the field of fabricated structures, ensuring the connection reliability between precast frame beams and columns is of paramount importance and represents a current research focus. This paper introduces a prefabricated frame joint centered around a core area consisting of a precast concrete-filled steel tube. The precast concrete beam connects with the steel component via the core area, and cast-in-place steel fiber self-compacting concrete is employed at the beam end to establish the connection between the precast concrete beam and the precast core area. To assess feasibility, a new type of frame joint is designed and compared with a conventional cast-in-place frame joint. Hysteretic behavior of the joint is examined, and differences in ductility, strength, stiffness degradation, energy dissipation capacity, and moment-curvature of plastic hinge region between the two types of joints are analyzed and compared. The results show that both specimens exhibited a plastic hinge failure mode, but the new joint’s steel components, steel tubes, and column reinforcement remained unyielded. Furthermore, the new joints demonstrated slightly superior ductility, energy dissipation capacity, and bearing capacity when compared to the cast-in-place joint. This suggests that the assembled joint can at least meet the requirements of the cast-in-place joint.
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Supported by the National Natural Science Foundation of China（51678152），New Century Talents in Fujian Province’s Universities（GY-Z17069）and Fujian University of Engineering Research Initiation Fund(GY-Z13119).
