Study on mechanical properties of fabricated beam-column joints based on nonlocal enhanced plasticity-damage microplane model
Beam-column joints of the fabricated structure are the key parts that affect the mechanical properties of the structure.In order to thoroughly and comprehensively explore its nonlinear mechanical behavior,it establishes a refined finite element calculation model based on the nonlocal enhanced plastic damage microplane model,using the ANSYS finite element program,considering construction measure such as the new-old combination surfaces of concrete.Based on the relevant tests,the reliability of the finite element model is compared and verified.The influence of concrete strength grade,axial compression ratio and longitudinal reinforcement ratio on the bearing capacity and ductility of prefabricated joints was investigated.The results show that the bearing capacity of the joint increases with the increase of the concrete strength grade in the cast-in-place,axial compression ratio and the longitudinal reinforcement ratio in the top of the beam.The ductility of the joint increases with the increase of the concrete strength grade and the longitudinal reinforcement ratio in the top of the beam,and the axial compression ratio has little effect on it.And it provides theoretical basis and reference for the design and application of beam-column joints in fabricated structures.
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