| With the continuous advancement of new urbanization and supply-side structural reforms,the construction method based on cast-in-place can no longer meet the requirements of the new development concept.The development of new building industrialization represented by prefabricated buildings has become an industry trend.In recent years,Although prefabricated buildings have been rapidly developed under the support of policies,the structural form and performance design of fully prefabricated frame structures still need to be improved,especially the seismic performance of key parts such as beam-column connections.Therefore,the development of a new fully assembled beam-column joint with good seismic performance and simple structure has become the focus of research on fabricated structures.Based on the low-cycle reciprocating test of the new fully-assembled beamcolumn joint,this paper compares and analyzes the seismic performance of each node under the action of earthquake.At the same time,the finite element software OPENSEES is used to perform the finite element numerical value of the new fullyassembled beam-column joint specimen.analysis.The main work and results of this paper are as follows:（1）Based on the research results of the existing fabricated beam-column connection,a new type of beam-column connection by high-strength bolts is proposed.The node is composed of steel corbels and beam-column prefabricated members.The installation gap between the steel corbel and the precast beam can enhance the rotation ability of the beam,and use structural measures to transfer the plastic hinge to the connection area,thereby using the connection area to dissipate seismic energy.（2）The structural design software PKPM is used to calculate the prototype structure of the concrete frame.In order to eliminate the influence of the size effect,three frame mid-node test pieces are designed according to the full-scale model,including the new fully assembled test piece（PC2）and the assembled post-cast integral Type specimens（PC1）and cast-in-place specimens（RC）.According to the test purpose,the test loading plan and the test measurement plan were formulated,and the low-cycle reciprocating test loading of three specimens was completed.（3）Combined with the experimental phenomena,the low-cycle reciprocating test data of the three specimens is analyzed,and mainly studies the energy dissipation capacity,steel strain,strength and stiffness of the specimen.The test results show that the new fully assembled specimen（PC2）under the action of low-cycle reciprocating load mainly exhibits plastic hinge failure in the connection area of the beam end,the hysteresis curve of the specimen is relatively full,and it has better energy dissipation capacity;After overcoming the friction,it starts to slip,which increases the ductility of the joint without reducing the ultimate bearing capacity of the joint.（4）The finite element analysis model of the three-node specimens was established using the finite element software OPENSEES.the RC specimen and the PC1 specimen were subjected to numerical simulation analysis under low-cycle reciprocating load.The simulation results verify the correctness of the key parameters of the finite element analysis model.Then,the former model parameter value method is used to establish the finite element analysis model of the new fully assembled beam-column joint specimen.The numerical calculation results are in good agreement with the test results. |
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