Interaction Diagrams

Owned by Tim Kostka
Last updated: Oct 17, 2023
1 min read

Eriksson Pile contains three unique interaction diagrams. The first is the ultimate interaction diagram showing the ultimate capacity of the member from only prestress reinforcement. The second is the ultimate interaction diagram showing the ultimate capacity of the member from only mild reinforcement. The third is the service interaction diagram which shows the service capacity of the member.

Ultimate Interaction Diagrams

Eriksson Pile allows for the use of two different methods to calculate flexure strength for the Ultimate Interaction Diagram. These two methods are the Secant Method from the ACI Journal 1970, and the ACI Moment Magnification Method. Strain compatibility is used to find the flexure capacity of the member. The detailed methodology of this procedure can be found at .

Service Interaction Diagram

The service interaction diagram was created based on elastic section analysis using gross cross-sectional properties of the member.

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