Sharif University of Technology Scientia Iranica 1026-3098 22 5 2015 10 01 Nonlinear behavior of RC frames strengthened with steel curb and prop Nonlinear behavior of RC frames strengthened with steel curb and prop 1712 1722 1991 EN A. Khalili Department of Civil Engineering, Semnan University, Semnan, Iran A. Kheyroddin Department of Civil Engineering, Semnan University, Semnan, Iran A. Farahani Department of Civil Engineering, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran M. K. Sharbatdar Department of Civil Engineering, Semnan University, Semnan, Iran Journal Article 2014 11 26 Using steel curbs and props is an appropriate method for strengthening the moment resisting reinforced concrete frames. In this paper, RC frames which were strengthened using steel prop and curb only, and in combination with beam's revival steel sheets and column jacketing are investigated using numerical modeling. After verifying the models, local and global behavior of these frames, such as displacement, ultimate strength, ductility factor and reduction factor were studied. Analytical results show that ultimate lateral 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 to the results, when the prop's area increases, the ductility factor and the reduction factor of frames will decrease. The effect of column jacketing and beam revival sheet are opposite each other, while column jacketing increases the strength of the frame, the beam's revival decreases it, and when column jacketing increases ductility, the beam's revival decreases it. https://scientiairanica.sharif.edu/article_1991_96055f5b06bf9381ac43879351642cf5.pdf