static elastoplastic analysis;  Competency spectrum;  Demand spectrum

The basic principle and implementation steps of static elastoplastic analysis in SAP2000n program are analyzed, and some of these parameters are adjusted in combination with Chinese standards. Finally, the static elastoplastic analysis and seismic performance evaluation of a four-layer frame were carried out by program. The results show that this method can comprehensively and quantitatively evaluate the structure from the aspects of interlayer displacement angle, plastic hinge distribution and deformation, and can reveal the weak links of the structure under the action of rare earthquakes, which is an effective method to realize performance-based design.