Study On Seismic Performance Of Fabricated Reinforced Concrete Beam-Column Joints Under Cyclic Loading

With the upgrading of China’s industrialized industry,the country vigorously promotes more economical,convenient and environmentally friendly prefabricated buildings.In recent years,China’s research on prefabricated structures has achieved remarkable results,but problems such as insufficient construction accuracy of prefabricated joints,difficult transportation of prefabricated components,and unsatisfactory seismic design still remain prominent.Aiming at the previous research problems,a study on the seismic performance of new fabricated reinforced concrete beam-column joints was carried out to explore the engineering practicability of fabricated reinforced concrete beam-column structures and provide a new idea for the development of fabricated reinforced concrete joints.Provide experimental basis and reference for related research.Through reciprocating low-cycle test research on the cast-in-place reinforced concrete nodes,the assembled reinforced concrete nodes in the core area,and the assembled reinforced concrete nodes in the core area,the damage characteristics,Reinforced steel plate strain and other mechanical performance indicators,compared with the bearing capacity and ductility,hysteresis curve,skeleton curve,stiffness degradation,energy dissipation capacity,cumulative damage and other seismic performance indicators of joint specimens,the results show that: In comparison,fabricated reinforced concrete joints show better plastic deformation capacity and energy consumption performance.The specimen’s bearing capacity is improved,ductility is improved,cumulative energy consumption capacity is increased,and cumulative damage is relatively reduced.It can meet the requirements of seismic code and facilitate the construction.The finite element numerical simulation analysis of prefabricated reinforced concrete beam-column joints was performed using ABAQUS software.The simulation results are consistent with the experimental results and have a good agreement,which verifies the feasibility of the model.Based on this,the parameter variables of concrete strength,longitudinal reinforcement ratio,axial compression ratio,and longitudinal reinforcement strength are designed to study its influence on the seismic performance of the specimen.The research results show that as the concrete strength increases,the bearing capacity is obvious.Increased energy consumption is stronger.The increase of the axial pressure ratio causes the reverse bearing capacity of the nodes to decrease significantly,which adversely affects the seismic resistance of the nodes.Therefore,the axial pressure ratio should not be too large.The use of large-diameter,large-space reinforcements has no obvious effect on the performance of beam-column joints.Therefore,under the premise of ensuring the joints’ mechanical performance,in order to simplify construction and improve construction quality,large-diameter,large-space,and high-strength steel reinforcements.