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Why does PROFIS Anchor provide higher capacities than the simplified tables?

Posted by Tim Freudensteinabout 8 years ago
Why does PROFIS Anchor provide higher capacities than the simplified tables?

*Posted on behalf of a Hilti customer

When I compare calculations between PROFIS Anchor and the Simplified Tables, PROFIS Anchor provides a much higher capacity. Which result can I use in my design?

Design,CSA

1 Reply
Posted by Robert Walkerabout 8 years ago
Hilti Verified

Dear customer,

Thank you for your question. Calculations using the Simplified Tables have the potential of providing a design strength (factored resistance) that is exactly what would be calculated using equations from CSA A23.3-14 Annex D. The tables for the single anchor design strength (factored resistance) for concrete / bond / pullout failure or steel failure have the same values that will be computed using the provisions of CSA. The load adjustment factors for edge distance influences are based on a single anchor near an edge. The load adjustment factors for spacing are determined from the influence of two adjacent anchors. Each reduction factor is calculated for the minimum value of either concrete or bond failure. When more than one edge distance and/or spacing condition exists, the load adjustment factors are multiplied together. This will result in a conservative design when compared to a full calculation based on CSA A23.3 Annex D. Additionally, if the failure mode in the single anchor tables is controlled by concrete failure, and the reduction factor is controlled by bond failure, this will also give a conservative value (and vice versa). For anchor design with multiple reduction factors we suggest using Hilti PROFIS Anchor design software. Please feel free to reach out any time, if you need additional information.

Best Regards
Robert