Masonry Magazine September 2011 Page. 40
CODES AND STANDARDS
Capacities typically are determined by performing tests for a specific condition and dividing the average value from the tests by a factor of safety.
center anchor was loaded in tension to failure. That result was compared to the results from single-anchor tests performed with no anchors in the adjacent cells. There was no statistical difference between the results.
Post-installed anchors loaded in shear can exhibit the same failure modes as anchors installed in concrete anchor material failure, masonry failure and pryout failure - depending on diameter, embedment and masonry. However, the masonry failure geometry can be different than for concrete, due to the discontinuities of masonry material. Fracture lines can follow along mortar joints or cross the masonry unit.
For concrete, strength-design equations have been developed to calculate the capacity of the concrete to resist loads applied to installed anchors, including single anchors, groups of anchors, tension and shear loads, and other combinations. For masonry, these equations have not been developed. Currently, a strength design method for anchorage to masonry does not exist. Load tables in manufacturers' literature and Evaluation Service Reports typically are based on Allowable Stress Design. The capacities typically are determined by performing tests for a specific condition and dividing the average value from the tests by a factor of safety. This may lead to variations of published performance data, even in cases in which the masonry is the mode of failure.
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