Amir Parviz Khosravi Amiri - Lecturer and Postgraduate of structural engineering, Young Researchers and Elite Club, Roudehen Branch, Islamic Azad University, Roudehen, Iran
B. Amin Nejad - Assistant Professor, Department of Civil Engineering,Roudehen Branch, Ialamic Azad University Roudehen, Iran
E. Behradi Mehr - Postgraduate of civil engineering, Young Researchers and Elite Club, Roudehen Branch, Islamic Azad University, Roudehen, Iran

The main purpose of this study is comparison and investigation of different types of composite columns in framed structures in plastic mode under dynamic loads, In this study the performance of the MRFs with composite columns has been evaluated using 3-story structural models, considering the base reactions obtained from the non-linear analysis. The results show good performance of composite sections under the seismic loads. Also, a comparison between two types of composite sections, the full and half-embedded steel sections in concrete, has been made. The columns are designed for the construction frames with 3 floors s by Plastics Method. and to study the dynamic behavior of the models were used three strong earthquakes

Composite Columns , Framed , Dynamic Loads , Plastic Mode