چكيده لاتين :
During recent seismic events, non-ductile failure modes
ofmany existing structures occurred. Retrofit ofthese structures before
the earthquake provides a feasible cost-effective approach to reduce
the hazard to occupantsי safety and ownersי investment. The response of
two reinforced concrete frames was examined under seismic excitation.
The 9-storey and 18-sto~·eY.fi·amesare part ofthe lateral load resisting
system in two office buildings that were designed according to the 196001י
code provisions. The frames were analyzed assuming flexible joint
response by considering the joint shear deformation or assuming
traditional rigid joints. Two rehabilitation techniques were proposed to
improve the dynamic response of these Fames. Fibre reinforced
polymer (FRP)jackets were used as a local rehabilitation technique to
enhance the joint shear strength and ductility. As another option,
Xssteel braces were installed in the middle bay of the Fame along its
height as an alternate lateral load resisting system. For each frame,
failure sequence and interstorey drift were examined. It was found
that FRP wrapping eliminated the brittle failure modes without
significant change in the structural response. However, steel bracing
significantly contributed to the structural stiffness and reduced the
maximum interstorey drift of the frames.
