Nonlinear behavior of RC frames strengthened with steel curb and prop

Using steel curbs and props is an appropriate method for strengtheningthe moment resisting reinforced concrete frames. in this paper, rc frames which werestrengthened using steel prop and curb only, in combination with beam's revival steelsheets and column jacketing are investigated using numerical modeling. after verifying themodels, local and global behaviors of these frames, such as displacement, ultimate strength,ductility factor and reduction factor, were studied. analytical results show that ultimatelateral load of strengthened frames using the prop with sectional area of 1.2, 2.0 and 3.5 cm2,has grown up to 2.0, 2.66 and 3.3 times of the ordinary frame, respectively. according tothe results, when the prop's area increases, the ductility factor and the reduction factor offrames will decrease. the eects of column jacketing and beam revival sheet are oppositeeach other; while column jacketing increases the strength of the frame, the beam's revivaldecreases it, and when column jacketing increases ductility, the beam's revival decreases it.