In 2009 the Applied Technology Council (ATC) introduced FEMA P695 due to lack of scientific method, rational platform, and valid
analytical methodology to calculate Seismic Demand Parameters. The philosophy of behavior factor as a one of important SDP is based on giving the structure the possibility to enter into inelastic phase and uses the element ductility capacity instead of performing time-consuming and complicated inelastic analysis. the economic structure is a result of this standpoint. In this paper 20 building structure models in 4 performance groups with 4, 6, 8, 12 and 16 stories have been considered to calculate the R factor for Buckling Restrained Brace systems proposed by Iran's Standard 2800 (4th edition) using FEMA P695 methodology. 4 and 6 m frame bay width selected and R factor of each model discussed using static and dynamic nonlinear analysis and OpenSees software. The result shows that the R factor introduced by Iran's Standard 2800 (4th edition) passes all criteria and regulations of FEMA P695.