The main objective of the study reported heerin has been to develop a general seismic rehabilitation and upgrade approach for existing nonductile reinforced concrete (RC) moment frame buildings. A review of the design and as-built drawings of such existing buildings reveal that one of the main weaknesses is the lack of trasnverse (shear) reinforcement in the beam-column joints. Thus it was decided to attempt an upgrade approach centered on the use of a steep jacket placed around each of these joints. Furthermore, it was considered desirable that the study be conducted on an existing instrumented building that had already been subjected to at least moderate earthquake ground motions (EQGMs) so it would be possible to calibrate the analytical models and computations involved in the analyses of its response and degree of damage.
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