| In recent years,a large number of steel structure houses have been put into use,it is found that the design of the connection nodes between wall panels and a main frame significantly affects the seismic performance of the structure.The connection nodes of wall panels and the main frame can be divided into rigid nodes and flexible nodes.Rigid connection nodes cause early destruction of wall panels when subjected to earthquake,while flexible connection nodes can make wall panels and the steel frame deform in concert,weaken the interaction between wall panels and the steel frame and delay the destruction of wall panels.In response to the above problems,a new connection node was designed in this paper to realize the collaborative work of embedded wall panels and the steel frame.In this paper,22 specimens were designed to study the cooperative work mechanism of the steel frame with embedded wall panels through ABAQUS finite element software.Based on the finite element simulation results,the reasonable node form,aperture ratio,and steel thickness of the connectors were determined.The heightto-span ratio,wall panel thickness,and friction coefficient between wall panels were used as parameters to study the mechanical performance of the embedded wall panels and to determine the range of values of each variable.The study provides theoretical guidance for the application of the new connection nodes in engineering.The results of the study are as follows.(1)Finite element models of pure steel frames,steel frames with embedded wall panels connected rigidly,and steel frames with embedded wall panels with new connection nodes were established,and the influence of wall panels,rigid connection,and new connection on the mechanical performance of the structure was analyzed.(2)The effects of connection node form,aperture ratio,and connection steel thickness on the mechanical performance of the steel frame with embedded wall panels were investigated,and 11 specimens were designed.Research shows that the bearing capacity,ductility,stiffness degradation law,and energy dissipation capacity of the specimen are influenced by the form of connection nodes.The GJ-3-4 specimen can adapt to larger inter-story deformation and has better seismic performance.Increasing the aperture ratio improved the ability of wall panel slip deformation.Increasing the steel thickness of the connectors improved the load-bearing capacity of the structure,but in the late loading stage,the thicker the connectors,the greater the stiffness,which is not conducive to delaying the damage of the wall panel.Under the premise of ensuring safety and reliability,the specimens of 5mm thick connectors can delay the damage of wall panels and have good seismic performance.(3)The height-to-span ratio,wall panel thickness,and friction coefficient between wall panels are used as parameters to study the effect on structural mechanical performance.The results show that the load-carrying capacity,initial stiffness,and energy dissipation capacity of the specimen gradually increase and the ultimate displacement gradually decreases as the high span ratio decreases.When the height-span ratio is 0.79,the wall panels have better cooperative working performance with the steel frame.Increasing the wall panel thickness improved the bearing capacity,initial stiffness,ductility,and energy dissipation capacity of the specimens.The seismic performance of the structure is better when the wall panel thickness is in the range of 100mm～150mm.The increased friction coefficient between the wall panels leads to difficulties in staggered movement of the wall panels and weaken the ability of the wall panels to deform in concert with the steel frame.When the friction coefficient is in the range of 0.5～0.6,the embedded wall panels have a large relative slip with the new connection nodes,which can effectively delay the destruction of the wall panels. |
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