Study On Seismic Behavior Of Steel Composite Shear Wall With Concealed Bracing

In recent years,as a new type of semi prefabricated structure,composite shear wall has been widely used in high-rise building engineering in China because of its advantages of high industrialization,fast construction speed and small environmental pollution.With the development of China's economy,the height of high-rise buildings is increasing,and the requirements for the seismic performance of vertical structural members are also increasing.The research shows that for ordinary concrete shear wall structure,the seismic performance of the structure can be effectively improved by reasonable setting of steel concealed support,while for composite shear wall structure,the research on the influence of steel concealed support on the seismic performance of the structure is relatively less.Therefore,in this paper,concealed bracing are added to the interior of the composite shear wall,and section steel is set in the edge members of the shear wall to form the composite shear wall with concealed bracing.The finite element simulation loading test is carried out to study its seismic performance by using the finite element analysis software ABAQUS.The main research contents and conclusions are as follows:(1)In this paper,three kinds of finite element models of steel composite shear wall with concealed supports are established by using ABAQUS.They are the model of steel composite shear wall without concealed supports,the model of steel composite shear wall with concealed supports only at the bottom and the model of steel composite shear wall with full height concealed supports Test.The simulation results show that the structure with concealed bracing can effectively enhance the seismic performance;compared with the structure with full height concealed bracing,the structure with concealed bracing at the bottom has only a small reduction in seismic performance,but it saves a lot of steel,which is a more suitable layout.(2)The influence of these parameters on the bearing capacity and ductility of the shear wall with concealed bracing is studied by changing the steel ratio of concealed bracing,axial compression ratio and steel ratio of edge members.The simulation results show that: the increase of steel ratio of concealed bracing can effectively increase the peak bearing capacity of components;with the increase of axial compression ratio,the bearing capacity of walls will increase,but the excessive axialcompression ratio will affect the ductility of components and reduce the seismic performance of components;the increase of steel ratio of edge components can improve the bearing capacity of components,but the excessive steel ratio of edge components can increase the bearing capacity of components The steel ratio will lead to the degradation of ductility.(3)Combined with the code and the existing research results,the calculation formula of the flexural capacity of the normal section of the steel composite shear wall structure with concealed support is established,which provides a reference for the relevant engineering design and calculation.