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Abstract Low height beams in concrete moment frames, decrease the ability of beams in controlling lateral displacement of buildings. Because of that, in the sixth subject from Iranian Regulations of Buildings and its following, in the 3rd edition of Standard 2800, the height of buildings with low height beams has been limited to 3 floors or 10 meters. According to that, in this study, concrete buildings with different amount of stories and moment frames, with medium ductility and the height of beams in 30 centimeters, have been analyzed (with linear equivalent static and spectral dynamic analysis Methods)and designed on the basis of seismic principles in the 2nd and 3rd edition of Standard 2800. Finally, studies continued with nonlinear static analysis and the performance point of structures determined (with capacity spectrum and displacement coefficient methods) in 4 levels of different seismic risks. Studies show that only one or two story buildings that designed with 2nd edition of Standard 2800 have enough safety in design base earthquake level (DBE) and also higher buildings, should go under rehabilitation.

Keywords: Reinforced Concrete Structures, nonlinear static analysis, Performance level, Moment frame, Lateral Displacements

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