Abstract:Software ABAQUS was used to establish a three-dimensional solid finite element model of a 2-story 1-span reinforced concrete plane frame structure for pseudo-dynamic analysis. The model takes into account the plastic damage of concrete, the elastic-plastic mixed hardening properties of steel, the structural damping, and the cumulative effect of plastic damage caused by continuous earthquakes. The calculated results of displacement and restoring force are in good agreement with existing pseudo-dynamic test results, then the structural damage, the plastic energy dissipation distribution mechanism, and the stress-strain relationship of concrete and steel bar are further analyzed. The results showed that the plane frame structure is basically in the elastic stage under small and medium earthquakes, and enters the plastic stage under large earthquake. The concrete at the beam-column joints is easier to be crushed than that at the bottom of column, and the first floor beam is easier to be destroyed than the second floor beam. The plastic energy consumption of beam is much larger than that of column, indicating that the frame is a typical "strong column and weak beam" structural system. The modeling method adopted in this paper can effectively reflect the damage process of the structure, and can be conveniently used for seismic performance evaluation of practical projects.
