Problem: About 934
steel reinforcing bars of the concrete slab were cut or damaged, compromising
the structural capacity of the concrete slab.
Repairing Methodology: After
evaluation of the structure, consulting team selected carbon fiber reinforced
polymer (CFRP) -- paper-thin fabric sheets bonded to concrete members with
epoxy adhesive -- to strengthen the loads. The solution came in the form of
approximately 15,000 square feet of CFRP on both the top and underside surfaces
of the reinforced concrete slabs. CFRP has a tensile strength approximately 10
times that of steel. Also, because only
a portion of the hotel was closed for the rehabilitation, safety of the
customers and employees was paramount. By the time team arrived at the site,
new interior wall partitions were being installed. Because of the nature of the
CRFP strengthening repair work, some of the partitions had to be removed. Repairing
team had to expedite the design, installation and development of detailed
as-built drawings for the CFRP as other contractors were working to finish each
floor.
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