This contains SACS wikis related to the SACS PSI program.

1. A step-by-step approach to Pile/Soil Interaction (PSI) analysis and diagnosing errors
   2. Error message with **ERROR-STIFFNESS MATRIX IS NON-POSITIVE DEFINITE FOR LOAD CASE#
   3. Nonsymmetrical T-Z curve
   4. Single Pile Analysis
   5. Soil Behavior Representation in SACS and Pile Increment
   6. Soil Liquefaction
   7. Pile thickness effects Pile Capacity?
   8. Compression & Tension Capacity Considering Pile Weight
   9. Pile analysis - Compression Capacity
   10. Pile Look Up Error
   11. PSI factors for SACS input
   12. No Soil plot in Chart Files
   13. ERROR - SOIL T-Z HAS ILLEGAL STRATA ORDER & ERROR - SOIL STRATA DESCRIPTION
   14. Consideration of soil liquefaction in PSI input
   15. PSI warning on DY-RZ Stiffness
   16. CPT data in PSI input
   17. Pile Code Check
   18. Pile Local Co-ordinate System
   19. ERROR NUMBER OF SOIL TABLES BEING INPUT EXCEEDS THE NUMBER INDICATED BY PILE INPUT
   20. Tubular Section resistance factors with Piles
   21. API Option in PSI input Line
   22. Limit of convergences for Displacement and Rotation in PSI
   23. Pile Number Limitations
   24. PSI Result interpretation with Internal Force, Stiffness Matrix, Force comparison etc
   25. SACS PISA Curves
   26. PSI Convergence criteria check
   27. Load Superposition in PSI
   28. Viewing PSI results output in the list file
   29. Factors to be considered when calculating large diameter piles in SACS
   30. P-delta effects on PSI Analysis
   31. Axial Capacities differences