The pushover analysis of prestressed concrete frame structures with stiffened side column

The bending moment of side column is large under vertical load; the amount of reinforcing steel bars is great. To solve this problem, one way is to add symmetric tendons in the exterior columns before the insurance of coluryin's lateral rigidity. The pushover analysis of twelve cases of different PCFS is processed to discuss the influence of the number of span, prestress degree of beam, longitudinal reinforcement and stiffened side column on the formation of energy dissipation mechanism and seismic capacity. The yielding moment of side column stiffened by tendons increase much, and the hinges appear later. At last the relatively stable structure consisting of side columns and roof beams comes into being. Although the energy dissipation mechanism is column hinge column, due to the enhancement of bottom column, the upper hinge appears in the column top of second story. So the first story and the second story form a mechanism as a whole. The energy mechanism is close to mixed column because the hinges of side column appear very later. Prestressed concrete frame structures with stiffened side column have good seismic capacity.