Buckling Restrained Braces

Authors : Prajwal Shankar H J, Dr. Bharathi Ganesh

Abstract

Adopting an appropriate lateral load resisting system in the structure to limit its deformation to a specified value a is challenging task when a structure is subjected to an earthquake of higher intensity. However, these structures typically generate large inelastic deformation which can cause severe damage to the structure and subsequently increase the complexity and cost of structural repair post-earthquake. Concrete structures impart higher seismic weight and lesser deflection in comparison to that of steel structures and hence are less effective in resisting earthquake forces. Composite construction combines the advantages of both steel and concrete. Buckling restrained frames are used as seismic-force resisting systems for buildings in seismically-active regions. The structural systems, called Buckling Restrained Braces (BRB) serve the purpose of dissipating energy in compression as well as in tension, and are an attractive alternative to conventional steel braces. BRB design and installation is quite complicated and requires skill. BRBs strength mainly depends on the ductility of higher grade of steel which involves more initial cost. BRB design and installation is quite complicated and requires skill. BRBs have high energy dissipative ability than ordinary steel bracings. Largely practiced lateral load resisting system of shear wall has been replaced by a new type of bracing known as Buckling Restrained Bracing and analyzed to know the behavior of RCC frame under dynamic earthquake loadings. In the present study the behavior of concentric and eccentric Buckling Restrained Braced RCC frames in comparison with shear Walled RCC frames in seismic Zone V focuses on the analysis of concentric and eccentric Buckling Restrained Braced RCC frames with different systems in comparison to a RCC frame with shear walls. A19 Story structure with BRB frames and RCC shear walled frames is analyzed considering the effect of earthquake in seismic Zone V. The results show that BRBs system make the structure more earthquake resistant than shear walled system recommending the use of BRBS in RC framed structure in a seismic zone of highest intensity i.e., Zone V.

Keywords : Buckling Restrained Bracing, Hysteretic Behavior, Ductile, Yielding Core, Seismic-Force Resisting Systems