Seismic Effect Of Welding Residual Stress On Composite Shear Wall With Square Steel Tubular Welded By C-style Steel And Infill Concrete

With the wide application of high-rise buildings at home and abroad,Steel-concrete composite shear wall provides a new and effective choice with its high lateral stiffness,good ductility,good capacity of energy dissipation and high safety reserve,etc.The part of steel structure in the shear wall is generally formed by connecting steel plates or steel sections in a certain way,and welding is a more common connection method.However,the welding residual stress is prone to cause local stress concentration in the shear wall.Under the external load,especially the earthquake action,the residual stress may reduce the bearing capacity and overall stability of the structure,then affecting the structure seismic performance and causing unnecessary damage.Therefore,in this paper the seismic performance of composite shear wall with square steel tubular welded by C-style steel and infill concrete,is studied by means of numerical simulation and theoretical analysis,and provides some references for its design and construction.The specific work is as follows:1)The ABAQUS numerical analysis model of shear wall with square steel tubular welded by C-style steel(the concrete was not filled)was established.The single ellipsoid heat source model was imported into ABAQUS by using DFLUX subroutine,thus the temperature field under different parameters was obtained,and the results of thermal cycle were analyzed.2)The indirect coupling method was used to import the results of the welding temperature field into the calculation model of the residual stress field.The welding residual stress of the steel structure in the composite shear wall was obtained,and the distribution law of welding residual stress was achieved.3)The welding residual stress was loaded into the composite shear wall.Under the cycle loading,the ultimate bearing capacity,ductility and energy dissipation of composite shear wall with and without welding residual stress were compared,and the influence of residual stress on the seismic performance of the wall was analyzed.On the whole,the residual stress of welding has little effect on the seismic performance of composite shear wall.