Research On Seismic Performance Of Steel Frame-wood Plate Filled Double Steel Plates Composite Shear Wall Structure

With the increase of the city population density and the change of global climate,the construction industry in our country should develop in a green direction.As a green assembly building material,wood has the advantages of renewable material,green environmental protection and good heat preservation and insulation,therefore the application and development of wood has increasingly attracted people’s attention in the field of construction.In addition,the wooden structure can also be processed with other structures to form a composite system so as to build multi-storey or high-rise wooden mixed structures rather than limited to low-rise buildings under three storeys.Steel frame-OSB plate infilled double steel plates combined shear wall is the main force bearing member to resist lateral deformation in multi-storey and high-rise building structures,and its structural composition is that the OSB plate is filled in the gaps formed by steel plates on both sides which is bonded to the core board into a whole"sandwich"bearing member by two-component epoxy resin cement.In order to fully understand the seismic performance of the neotype combined shear wall structure,the methods of numerical simulation and theoretical analysis will be combined to conduct research on this structure.The main research contents in this thesis are as follows:According to the existing pseudo-static test of ordinary steel plate shear wall and the three-point bending test of light wooden sandwich plate,establishing the corresponding finite element model of ABAQUS and the simulation analysis is carried out,and the finite element simulation results are further extracted and compared with the bearing capacity,initial stiffness and ductility performance of pseudo-static test under the reciprocating cyclic loading,and the deflection and failure mode of three-point bending test.The results are close to each other,which verifies the feasibility of the numerical simulation method.The OSB plate infilled combined wall model is established on the basis of the ordinary steel plate shear wall.The ABAQUS is used to simulate and analyze the mechanical performance of the ordinary model and the infilled model under the reciprocating cyclic load from the aspects of hysteresis performance,out-of-plane deformation,stiffness degradation,bearing performance and energy dissipation capacity.The analysis results show that the infilled wall has full hysterical curve,favourable initial stiffness and high ultimate bearing capacity.The stuffed OSB plate can restrict the out-of-plane buckling of steel plates on both sides,significantly reduce the out-of-plane deformation of the infilled combined wall and improve the external buckling of wall plates,moreover,the yield and ultimate bearing capacity as well as other bearing performance parameters of infilled combined wall are much higher than those of ordinary steel plate wall.Both kinds of shear walls possess excellent energy dissipation capacity,however the infilled shear wall has higher energy consumption and energy dissipation coefficient.It is proved that the filling of OSB plate plays an important role in the seismic performance of structure.First,the basic model of OSB plate infilled wall is designed,and then the ratio of height to thickness,the thickness of steel plate on one side,the ratio of span to height and the lateral stiffness of frame column are changed successively.The effects of the above parameters on the seismic performance of OSB plate infilled combined shear wall are investigated by ABAQUS from three aspects including the hysteretic property,bearing capacity and energy dissipation capacity.The research results show that increasing the thickness of the embedded steel plate,the ratio of span to height and the lateral stiffness of the column can effectively improve the shear capacity of the combined shear wall.Reducing the ratio of height to thickness of the structure can make the hysteretic curve of the structure fuller and has better hysteretic properties,bearing properties and energy dissipation capacity.Based on the tension strip model,an simplified model which is suitable for OSB plate infilled wall is proposed,and the formula for calculating its shear capacity is achieved under the monotone loading.Some parameters in the formula are valued according to relevant literature,and the initial spring stiffness k_mand proportional coefficient p are appropriately assigned by considering the initial stiffness and overall performance of the combined shear wall itself.Then,the calculated load-displacement curves of the theoretical formula are compared with the curves of the models with different height-thickness ratios and the thickness of steel plate on one side.Moreover,the load bearing performance parameters such as yield and ultimate bearing capacity are derived from the two groups of curves respectively for verification,the results show little difference,and the load-displacement curves obtained by two methods are in good agreement.