Masonry Magazine September 2011 Page. 41
Designers and contractors should verify that the application for which they are using anchors is consistent with the data supplied by the manufacturer and contained in an independent assessment, such as an ICC-ESR. The International Code Council - Evaluation Services organization does not conduct testing of products. However it does review test data provided by manufacturers and independent test labs in accordance with published Acceptance Criteria (AC). The three Acceptance Criteria published by ICC-ES for post-installed anchorage to masonry are AC01 (Expansion Anchors), AC58 (Adhesive Anchors) and AC106 (Screw Anchors). While differences do exist between these three criteria, there are similarities.
Referenced standards (ASTM or UBC) for masonry components are the same.
Single-anchor tests are required at different embedments and for different diameters for both tension and shear.
Tests to determine the influence of geometrical conditions, such as spacing and edge distance are conducted. In some cases these tests are optional.
Suitability tests are required. For expansion anchors and screw anchors, these may include the effect of variations in drilled hole diameter or torque. For adhesive anchors, these will include effect of temperature, dampness and other environmental conditions.
Special loading tests include seismic tests and combined tension and shear loading tests. These tests may be optional.
Much information is available for post-installed anchorage to masonry. Manufacturers have tested some specific applications, such as attachment to the top of grout-filled CMU walls. It is nearly impossible for an Evaluation Report or manufacturers' data to provide exact data for every application of anchorage to masonry. Some manufacturers may be able to provide additional guidance or data for applications not covered in their literature or in an ICC-ESR.
Designers and contractors can be confident that data published in Evaluation Service Reports has been verified by an independent testing agency and reviewed by personnel at ICC-ES. Users of Evaluation Service Reports should read the entire report, including findings, conditions of use and footnotes, and verify that the application being considering is covered properly by the Evaluation Service Report.
Post-installed anchorage is an effective method of attaching steel elements to grout-filled concrete masonry. Careful reading of manufacturers' literature and independent assessments can help users achieve reliable connections. IMAS
Pete Anderson is an approvals engineer with Hiti Inc. He has more than 25 years of experience dealing with codes and approvals issues related to post-installed anchoring into concrete and masonry.
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READER SERVICE #278
September 2011
MASONRY 39