I would like to know how to apply the following to your load charts. "3 - Linear interpolation between embedment depths and concrete compressive strengths is not permitted.
4 - Apply spacing, edge distance, and concrete thickness factors in tables 8-23 as necessary to the above values. Compare to the steel values in table 7.
The lesser of the values is to be used for the design." When installing vertical wall reinforcement into a strip footing do you multiple all of the factors together or just use the lowest factor? Edge distance factor x spacing factor x rated load, or just the lesser of the two.
Hello,
See Section 3.1.8 of the Anchor Fastening Technical Guide for info and an example problem on using the Hilti Simplified Design Tables; pages 19 and 20 outline the accuracy and limitations of using the simplified tables. Generally, the load adjustment factors tables (including load adjustment factors for spacing, edge distance, etc.) are applied to the strength tables.
Please note: the simplified design tables from the Anchor Fastening Technical Guide are a very conservative methodology; these tables are not meant to cover all situations, and essentially always assume the worst case combination of factors. It uses the worst case area reduction and the worst case strength. For the most accurate calculation, PROFIS Engineering follows ACI 318 exactly and is an alternative to hand calculations.
For further technical assistance please contact hnatechnicalservices@hilti.com.
Best,
Emily