Seismic performance analysis of improved precast steel-concrete beam-column joints
In order to study the seismic performance of the improved prefabricated beam-column joints,11 node models were established based on the finite element software ABAQUS to analyze the influence of vari-ous parameters on the seismic performance of the joints.The results show that the hysteretic curves of all specimens are full and the equivalent viscous damping coefficients are in the range of 0.266~0.362.The new prefabricated joints have good energy dissipation performance.The bearing capacity and ductility coeffi-cients of the new prefabricated joints are 5.4%and 12.8%higher than those of the traditional prefabricated joints,and the stiffness degradation ability and energy dissipation ability are also better than those of the traditional prefabricated joints.The increase of the strength of steel beam and steel joint can improve the de-formation ability of the specimen under load,but it has little effect on the bearing capacity,stiffness degra-dation and strength degradation ability of the specimen.The increase of the buried length of the steel joint and the strength of the internal longitudinal bars of the prefabricated beam can delay the stiffness degrada-tion and the speed of strength degradation of the test piece,and improve the bearing capacity and energy dissipation capacity of the test piece.Taking comprehensive consideration,the buried length of the steel joint should be at least 200mm,and the strength grade of the internal longitudinal bars of the prefabricated beam should be higher than HRB335 to ensure good deformation performance of the joint.
assembly typeprefabricated beam and column jointssteel jointseismic performancefinite element analysis