Research On Seismic Behavior Of Prefabricated Assembled Shear Wall Welded With Secret Column Steel

The prefabricated shear wall with concealed column steel welding connection can provide good bearing capacity and ductility energy dissipation capacity.At the same time,it has the advantages of short construction period,convenient construction,green energy saving,etc.It can realize industrialization of construction and industrialization of housing,in line with China’s green Current policies for sustainable development.The prefabricated shear wall with concealed column steel welding connection has been applied,but the research on this kind of connection is not enough,so this paper based on the finite element software ABAQUS,the prefabricated shear wall with concealed column welding connection is nonlinear.The analysis focused on the effects of axial compression ratio,section steel thickness,longitudinal reinforcement diameter and edge stirrup volume matching ratio on its seismic performance.The main research contents and conclusions are as follows:(1)Based on the existing dark column steel welded prefabricated shear wall test,the finite element software ABAQUS was used for nonlinear analysis,and the stress cloud diagram,hysteresis curve and skeleton curve of the finite element model were obtained.Comparative analysis of load-displacement curves and other results shows that the finite element numerical simulation results are basically consistent with the test results,indicating that the model is reasonable and effective.(2)The monotonic loading analysis was carried out on the shear wall of the welded connection of dark column steel.The parameters were analyzed in four aspects:axial compression ratio,thickness of the connection section steel,dark column longitudinal reinforcement,and edge stirrup volume matching ratio.The load-displacement curve of each model,and analysis of the bearing capacity and deformation law of each series of test pieces.(3)The dark column steel welded shear wall was repeatedly loaded and analyzed under the above four parameters under low cycle.By comparing and analyzing the structure’s failure form,hysteresis curve,skeleton curve,ductility,stiffness degradation and energy dissipation performance under various parameters,the seismic performance of the shear wall is studied.Through the above finite element calculation and analysis,we can get:1)When the axial compression ratio increases,the stress value of the concrete,section steel and reinforcement skeleton increases.When the axial compression ratio increases from 0.2 to 0.4,the bearing capacity increases by about 35.4%,and the ductile deformation capacity of the specimen increases slightly and then decreases;2)When the thickness of the section steel increases from 3mm to 6mm and 9mm,the bearing capacity of the test piece increases by about 28.2%and 5.3%sequentially,and the ductile deformation capacity increases by about 47.7%and 5.9%,respectively.After the degree,the concrete stress and bearing capacity no longer change significantly;3)When the diameter of the longitudinal reinforcement of the edge of the structure increases from 6mm to 8mm,10mm,12mm,the stress value of the concrete and the section steel increases,but the stress value of the reinforcement framework decreases,And as the diameter of the longitudinal bars increases,the bearing capacity of the structure increases by 18.7%,10.4%,and 1.2%,respectively,and the ductility increases by approximately 41.5%,44%,and 1.4%,respectively.When the diameter increases to 10 mm,the bearing capacity of the structure The change range of force and ductility is reduced;4)The stirrup diameter is increased from 6mm to 8mm,10mm,the volume member stirrup ratio of the edge member is increased,the concrete stress value becomes smaller,the stress value of the steel bar and the reinforcement skeleton increases,the peak load increases sequentially by approximately 13.5%and 12.5%,and the ductility increases by approximately 20.1%and 18.2%,respectively.The higher the stirrup volume matching ratio,the greater the stiffness and energy consumption.In summary,the prefabricated shear wall welded with concealed column steel has better energy dissipation capacity and ductile deformation capacity.