3.23.4
Prism Tests
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NOTE: Prism testing will only be required for
structures requiring masonry compressive strengths
higher than the assumed value of 9.3 MPa (1350 psi).
Prism testing normally will not be required.
Delete this paragraph when prism testing is not
required.
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At least one prism test sample shall be made for each 465 square meters
5,000 square feet of wall but not less than three such samples shall be
made for any building. Three prisms shall be used in each sample. Prisms
shall be tested in accordance with ACI 530/530.1. Seven-day tests may be
used provided the relationship between the 7- and 28-day strengths of the
masonry is established by the tests of the materials used. Compressive
strength shall not be less than [_____] MPa psi at 28 days. If the
compressive strength of any prism falls below the specified value by more
than 3.5 MPa 500 psi, steps shall be taken to assure that the load-carrying
capacity of the structure is not jeopardized. If the likelihood of
low-strength masonry is confirmed and computations indicate that the
load-carrying capacity may have been significantly reduced, tests of cores
drilled, or prisms sawed, from the area in question may be required. In
such case, three specimens shall be taken for each prism test more than 3.5
MPa 500 psi below the specified value. Masonry in the area in question
shall be considered structurally adequate if the average compressive
strength of three specimens is equal to at least 85 percent of the
specified value, and if the compressive strength of no single specimen is
less than 75 percent of the specified value. Additional testing of
specimens extracted from locations represented by erratic core or prism
strength test results shall be permitted.
3.24
SPECIAL INSPECTION AND TESTING FOR SEISMIC-RESISTING SYSTEMS
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NOTE: Include this paragraph only when special
inspection and testing for seismic-resisting systems
is required by paragraph 3.2 of FEMA 302, NEHRP
RECOMMENDED PROVISIONS FOR SEISMIC REGULATIONS FOR
NEW BUILDINGS AND OTHER STRUCTURES.
This paragraph will be applicable to both new
buildings designed according to TI 809-04, SEISMIC
DESIGN FOR BUILDINGS, and to existing building
seismic rehabilitation designs done according to TI
809-05, SEISMIC EVALUATION AND REHABILITATION FOR
BUILDINGS.
The designer must indicate on the drawings all
locations and all features for which special
inspection and testing is required in accordance
with Chapter 3 of FEMA 302. This includes
indicating the locations of all structural
components and connections requiring inspection.
Add any additional requirements as necessary.
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SECTION 04200
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