Experimental Study And Theoretical Analysis On Seismic Performance Of Steel Frame-double Skin Composite Wall Structure

The promotion of steel structure building is an effective way to develop prefabricated building.Steel frame structure is the most outstanding structural system used in high-rise steel buildings at present.It has the advantages of light self-weight,large architectural space,flexible layout,short construction period,convenient for assembly and easily standardization.However,the lateral stiffness of steel frame structure is relatively small,which needs to be combined with other lateral force resistant systems to have higher lateral stiffness.In order to develop a high-rise steel structure system with high assembly rate,short construction period,flexible layout and high lateral stiffness.The steel frame-double skin composite wall structure system is proposed in this paper.Series of research have been carried out on steel frame-double skin composite wal structure specimen through the means of quasi-static test,finite elements method and theoretical calculation:(1)A full scale single layer and single span steel frame-double skin composite wall specimen is tested under cyclic load.The failure mode,load carrying capacity,deformation capacity,ductility,stiffness degradation and energy consumption capacity of the specimen are studied.The distribution rate of lateral loads between the steel frame and double skin composite wall is explored.The strain of the specimen is analyzed and the failure process of specimen is defined.(2)The finite elements model of steel frame-double skin composite wall is established.Based on the calculation results of the model,the failure process of the structure is studied.The stress mechanism of double skin composite wall is clarified.The elastic-plastic development process of the double skin composite wall and steel frame is explored.The failure mechanism of the infilled concrete is analyzed.The transfer way of force between double skin composite wall and steel frame is determined.The mechanical model of steel frame-double skin composite wall structure is established.(3)Six L-shaped double skin composite wall specimens are designed.The specimens are tested under cyclic loads to investigate the mechanical mechanism,failure mode and seismic performance of the new type composite wall.The fiber-multi layer model of steel frame-double skin composite wall specimen is established.The influence of different factors on the stiffness,load carrying capacity and energy consumption of steel frame-double skin composite wall specimen is studied comprehensively by changing the size of steel frame beam,steel frame column,steel faceplate thickness,shear span ratio of composite wall and infill concrete strength of composite wall.(4)Through the establishment of the simplified calculation model of the double skin composite wall,the introduction of applicable calculation assumptions,and the adoption of a reasonable internal concrete constraint constitutive relationship.Based on the full section plastic calculation method,the calculation formula of the load carrying capacity of the L-shaped double skin composite wall is derived.The calculation formula of the lateral carrying capacity of the steel frame-double skin composite wal is obtained.The formula of lateral stiffness of steel frame-double skin composite wall structure is derived.