ACI 369R-11 Guide for Seismic Rehabilitation of Existing Concrete Frame Buildings and Commentary. 2.2.1.2 Nominal or specified properties—Nominal material properties, or properties specified in construction documents, should be taken as lower-bound material properties. Corresponding expected material properties can be calculated by multiplying lower-bound values by a factor taken from Table 2.1 to translate from lower-bound to expected values. Alternative factors may be used where justified by test data. 2.2.2 Component properties—The following component properties and as-built conditions should be established: 1. Cross-sectional dimensions of individual components and overall configuration of the structure; 2. Configuration of component connections, size of anchor bolts, thickness of connector material, anchorage and interconnection of embedments and the presence of bracing or stiffening components; 3. Modifications to components or overall configuration of the structure; 4. Most recent physical condition of components and connections, and the extent of any deterioration; 5. Deformations beyond those expected due to gravity loads, such as those caused by settlement or past earth- quake events; and 6. Presence of other conditions that influence building performance, such as nonstructural components that may interfere with structural components during earth- quake excitation. 2.2.3.2 Sampling—For concrete material testing, the sampling program should include the removal of standard cores. Core drilling should be preceded by nondestructive location of the reinforcing steel, and core holes should be located to avoid damage to or drilling through the reinforcing steel. Core holes should be filled with concrete or grout of comparable strength. If conventional reinforcing steel is tested, sampling should include removal of local bar segments and installation of replacement spliced material to maintain continuity of the reinforcing bar for transfer of bar force. Removal of core samples and performance of laboratory destructive testing can be used to determine existing concrete strength properties. Removal of core samples should employ the procedures included in ASTM C42/C42M. Testing should follow the procedures contained in ASTM C42/C42M, ASTM C39/C39M, and ASTM C496/C496M. Core strength should be converted to in-place concrete compressive strength by an approved procedure, such as that included in ACI 214.4R. ACI 369R pdf download.
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