In this update all soil strength tests have been aligned with the IEEE 691(2001) standard called "IEEE Guide for Transmission Structure Foundation Design and testing".
These tests specifically include:
1) Vertical bearing tip resistance
2) Soil skin resistance along pole shaft below grade
3) Tapered pole shaft anchoring effects
4) Uplift capacity
5) Overturning ground-line moment requirements for Depth of Setting
These values of ultimate strength capacities are de-rated by a factor of 2.0 in accordance with standard utility practice to address the inconsistency of soil and any inaccuracies with soil sampling or soil class determination.
Two other strength factors are further applied to these values. The first one is mandated by the Line Grade selected (GO95, NESC, CSA). This cannot be changed and will always adjusted to match the current standard. The last strength factor set is optional (default=1.0) and is set by the Designer in the project settings for a particular design. You can optionally further de-rate the calculated soil strength values for more conservative designs.
As appropriate, the net calculated values are compared against the expected loads and will generate the appropriate informational and error messages. Soil messages can be suppressed in the project message settings tab for the Design.