Question:
When calculating a cross-section in SHAPE‑THIN, I get the error message that Fy is not positive.
Answer:
Please define a yield strength and limit stresses in Window "1.2 Materials".
The yield strength is required to determine the plastic cross-section properties if the "Plastic cross-section properties" check box is selected in General Data.
The limit stresses are required to compare the calculated stresses with the limit stresses.