In order to solve the problem that the steel bars of the prefabricated concrete frame joints are easily collided in the joint area when the prefabricated beams are assembled,a measure is proposed to enlarge the distances of the legs of the column stirrups and the longitudinal bars.The low-cycle reciprocating loading tests were carried out on the full-scale T-joints of the fabricated frame with normal stirrup distance and enlargement.The failure mode,hysteresis performance,strength degradation,stiffness degradation,ductility and energy dissipation capacity of the two nodes were analyzed.Finite element software Abaqus was used to model the joint specimens,and the influence of axial compression ratio on the seismic performance of the joints was analyzed.The results show that the failure modes of the T-joint specimens of the fabricated concrete frame are all bending failures of ends of beams,and the concrete in the core area is basically intact;compared with the specimens having normal stirrup space,the specimens with stirrup space amplification have higher bearing capacity,delayed strength and stiffness degradation,stronger deformation performance and energy dissipation capacity at low axial pressure ratio,and poor bearing capacity and ductility at high axial pressure ratio.Under the low axial pressure ratio,the T-shaped node of the prefabricated concrete frame that meets the"strong column and weak beam"can enlarge the longitudinal bar spacing and stirrup limb spacing of the precast concrete column to achieve the smooth assembly of the joint.
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