An important theoretic research program was conducted in INCERC Cluj, in order to study the strengthening technique of the low or moderate damaged reinforced concrete frame structures, one of the existing construction types susceptible to damage.

The principal objectives of the analytical studies were to analyze the behavior under seismic loads of infill walls connected to the reinforced concrete frame with bonded anchors and to evaluate the influence of several parameters, like the thickness of infill walls, the thickness of the jackets, respectively the longitudinal reinforcement ratio in the jacket of the columns.