S.SH Hashemi - PhD Student, Dept. of Civil Engg., Tarbiat Modares University, Tehran
A.A Tasnimi - Associate professor, Dept. of Civil Engg., Tarbiat Modares University, Tehran, Iran.
M Soltani - Assistant professor, Dept. of Civil Engg., Tarbiat Modares University, Tehran, Iran.

In this paper a new method for nonlinear analysis of two dimensional reinforced concrete frames is proposed. In numerical modeling each frame is divided into two types of joint and beam-column elements. The effect of bond-slip has been considered in the formulation of beam-column element by removing perfect bond assumption from fiber method. Joint elements are formulated upon major behaviors including Pull-out of embedded longitudinal bars, shear and flexural deformation of joint panel and shear slip in interface section between joint and neighboring element. Four types of joint elements have been generated according to their position in the frame. Each element type has been modeled based on the major behaviors of that through the combination of one or more defined mechanisms and sub-elements. The reliability of the method has been assessed through the comparison of numerical and experimental results for a one bay two storey frame and a good agreement between experimental and analytical results is observed.

nonlinear analysis, RC frames, bond-slip, joint element