Abstract:Because of their light weight,high strength,and good seismic performance,steel structures are widely used in construction.At present,the research on the seismic performance and safety assessment of steel structures receives widespread attention at home and abroad;most of this research focuses on assessing the seismic performance of steel structures based on the performance design method,with little research on earthquake damage.Under such circumstances,the author firstly analyzed the main design parameters,such as web height,web thickness,flange width,and flange thickness,which affect the component damage evolution rule,and the author found that the most sensitive design parameters are web height and flange width,which provided a theoretical basis for the establishment of the storey damage model.Then,according to the analysis results,we obtained the damage value relationship between the frame beam,frame column,and storey damage evolution and analyzed the effect of sensitive factors on storey damage evolution,such as the stiffness ratio of column to beam,the height-width ratio of the structure,the axial-compression ratio of the frame column,and the steel corrosion rate.Finally,in order to study the influence of storey damage location and degree to the seismic damage of the steel frame structure,the author revealed the influence of storey damage on structural damage by analyzing the effect of single-storey steel frame structure damage on structural dynamic characteristics under El Centro seismic wave excitation.Inputting multiple seismic waves,the author got the relation between the damage value of structural integrity and the velocity-to-acceleration ratio of the seismic wave peak and ultimately established the damage evolution model of steel frame structures. The multi-level damage evolution model of "component-storey-structure" can provide the theoretical foundation and basic data support for establishing the storey damage model of steel frame structures under seismic excitation.
