Section 1911A Existing Concrete Structures
For existing concrete structures, sufficient cores shall be taken at representative locations throughout the structure, as designated by the architect or structural engineer, so that knowledge will be had of the in-place strength of the concrete. At least three cores shall be taken from each building for each 4,000 square feet (372 m2) of floor area, or fraction thereof. Cores shall be at least 4 inches (102 mm) in diameter. Cores as small as 2.75 inches (70 mm) in diameter may be allowed by the enforcement agency when reinforcement is closely spaced and the coarse aggregate does not exceed 3/4 inch (19 mm).
Design and construction of externally bonded FRP systems for strengthening concrete structures shall be in accordance with ACI 440.2R.
- Near-Surface Mounted (NSM) FRP bars shall not be permitted.
- Strengthening of shear walls and diaphragms (including chords and collectors) shall be considered as an alternative system.
Design capacities, reliability, serviceability of FRP materials shall be permitted to be established in accordance with ICC-ES AC 125. Minimum inspection requirements of FRP composite systems shall be in accordance with ICC-ES AC 178.