What is pushover analysis and how is it used in seismic evaluation?

Pushover analysis is a nonlinear static analysis where lateral loads are incrementally applied to a structural model until target displacement or collapse. It generates a capacity curve (base shear vs roof displacement) showing structural performance. Combined with demand spectrum in ADRS format, it identifies the performance point. Used in performance-based seismic design to check Life Safety, Collapse Prevention, or Immediate Occupancy objectives. It reveals plastic hinge formation sequence, ductility demands, and weak links in the structure.