A seismic-resistant steel frame with energy-dissipating, chevron-type braces is proposed. The are equipped replaceable hourglass-shaped pins made of duplex stainless steel. Under design seismic loading, energy dissipated through inelastic deformations confined in the while other members remain essentially elastic. As a result, exhibits high post-yield stiffness due to inherent properties stainl...

Response modification factors (R-factor) are used in current seismic building codes to reduce earthquake forces associated with seismic design level to determine force levels. In recent years, many authors have shown great interest in the development of seismic structural systems and several theoretical and experimental studies have been conducted to investigate performance of dampers but littl...

Response modification factor (R-factor) is one of the seismic design parameters to consider nonlinear performance of building structures during strong earthquake. Relying on this, many seismic design codes led to reduce earthquake loads imposed to the structure. The present paper tries to evaluate the R-factors of conventional concentric braced frames (CBFs) and special moment frames (MRFs) in ...

Abstract Shear dampers are known as famous seismic passive energy devices due to their suitable performance against loading improve the behavior of Concentrically Braced Frames (CBFs). The CBF system suffers from low ductility its compression member's susceptibility buckling. By adding shear directly diagonal element members CBF, prevent bucking and system. Although pertain high dissipation cap...

in this paper, the problem of layout optimization for x-bracing of steel frames is studied using the ant system (as). a new design method is employed to share the gravity and the lateral loads between the main frame and the bracings according to the requirements of the ibc2006 code. an algorithm is developed which is called optimum steel designer (osd). an optimization method based on an approx...