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One of useful methods for strengthening for reinforced concrete frames, is to use steel prop and crub in connections, alone or combined with beam's revival steel sheets and column jacketing with steel sheets or profiles. In this paper, after modeling and verifying application of model, behavior of RC frames, strengthened with this method was studied. For this purpose, a RC frame has been strengthened in 4 general ways (crub and prop, crub and prop with revival sheet among two beamâs crub, crub with column jacketing in the bottom of columnâs crub region, combination of three mentioned moods) with three different propâs sectional area. Results showed that using crub and prop increases stiffness and strength of frame, significantly. If crub and prop are used with column jacketing for strengthening RC frames, framesâ strength increase up to 3.3 times of ordinary frame. Adding beam revival sheet to crub and prop, causes sooner yielding and bulking in compressive prop.