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[BS] A107.5 Tests of Anchors in Unreinforced Masonry Walls
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Tests of anchors in unreinforced masonry walls shall be in accordance with Sections A107.5.1 through A107.5.3. Results of all tests shall be reported to the authority having jurisdiction. The report shall include the test results of maximum load for each test; pass-fail results; corresponding anchor size and type; orientation of loading; details of the anchor installation, testing apparatus and embedment; wall thickness; and joist orientation and proximity to the tested anchor.
[BS] A107.5.1 Direct Tension Testing of Existing Anchors and New Anchors
The test apparatus shall be supported by the masonry wall. The test procedure for prequalification of tension and shear anchors shall comply with ASTM E488. Existing wall anchors shall be given a preload of 300 pounds (1335 N) before establishing a datum for recording elongation. The tension test load reported shall be recorded at 1/8 inch (3.2 mm) relative movement between the existing anchor and the adjacent masonry surface. New embedded tension anchors shall be subject to a direct tension load of not less than 2.5 times the design load but not less than 1,500 pounds (6672 N) for 5 minutes.
Exception: Where obstructions occur, the distance between the anchor and the test apparatus support shall be not less than one-half the wall thickness for existing anchors and 75 percent of the embedment length for new embedded anchors.
[BS] A107.5.2 Torque Testing of New Anchors
Anchors embedded in unreinforced masonry walls shall be tested using a torque-calibrated wrench to the following minimum torques:
- 1/2-inch-diameter (12.7 mm) bolts: 40 foot pounds (54.2 N-m).
- 5/8-inch-diameter (15.9 mm) bolts: 50 foot pounds (67.8 N-m).
- 3/4-inch-diameter (19.1 mm) bolts: 60 foot pounds (81.3 N-m).
[BS] A107.5.3 Prequalification Test for Bolts and Other Types of Anchors
ASTM E488 or the test procedure in Section A107.5.1 is permitted to be used to determine tension or shear strength values for anchors greater than those permitted by Table A108.1(2). Anchors shall be installed in the same manner and using the same materials as will be used in the actual construction. Not fewer than five tests for each bolt size and type shall be performed for each class of masonry in which they are proposed to be used. The tension and shear strength values for such anchors shall be the lesser of the average ultimate load divided by 5.0 or the average load at which 1/8 inch (3.2 mm) elongation occurs for each size and type of anchor and class of masonry.
Related Code Sections
A107.5 Guidelines for the Seismic Retrofit of Existing Buildings, Tests of Anchors in Unreinforced Masonry Walls
Tests of anchors in unreinforced masonry walls shall be in accordance with Sections A107.5.1 through A107.5.3. Results of all tests shall be reported ...