Damping of Steel Eccentrically Braced Frames in Direct Displacement-Based Design

Due to the limitations and deficiencies in the force-based design approach, several methods are introduced and examined in order to improve this methodology. However, over the years, researchers have proposed displacement-based design methods. Among them, the direct displacement-based design (DDBD) method is one of the most thorough and accepted. The main goalof this method is to determineequivalentdamping. Considering the equivalentdamping and target displacement corresponding to the desired ductility, the design base shear is obtained from the displacement spectrum. Several methods are proposed to determine equivalentdamping. In this study, the revised effective mass (REM) methodis employed for the design of eccentrically braced frame (EBF) systems.Using this method, equivalentdamping isdetermined for EBF’s. Anexpression isproposed for determining the equivalentdamping for EBF’sin term of ductility.