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Re: about repairing rc strustures by using steel..

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Several multistory concrete buildings have been both temporarily and
permanently repaired using steel wide-flange members as X bracing running
from the roof level to the foundation, on the exterior of the building,
running right across windows in some cases.

Also many old brick buildings have been retrofitted by running steel X
bracing on the inside of the buildings, again right across windows. But
most old masonry buildings are repaired using gunite/shotcrete over heavy
reinforcing, on the exterior.

Stan Scholl, P.E., FASCE