Considering the strong and destructive earthquake in recent years and the damage caused by it, the need for more attention and importance in designing buildings is revealed. Therefore, everyone's attention is focused on the evaluation and seismic parameters affecting the design of structures against earthquakes.
These coefficients actually create a seismic design philosophy.In current codes regulations these coefficients are more based on engineering judgments and the scientific necessity of these coefficients is felt. Therefore, it is very important to know and review them. In this study in order to investigate and compare the seismic parameters of structures with special structural steel frame, buildings with 4, 7 and 10 floors with commercial use as research models are considered. These models are first designed by according to the Standard No.2800 and the tenth chapter of the National Building codes. Then, the evaluation and comparison of the performance of the structures according to the design principles based on the performance and seismic improvement instructions of the existing buildings was carried out using nonlinear static analysis in 3D. The results were showed that the coefficients were significantly different from the recommended coefficients in the Standard No.2800 And for research models with different number of floors different numbers were obtained, but the Standard No.2800 was recommended constant number.