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Your new results are still inconsistent with the calculation for 158 kN axial load, and my spreadsheet results. The screenshots below...

No, there has to be at least a corner where the concrete is in compression. I was talking about the direction of the NA. If a line...

OK, that explains the difference in our calculated results, and I agree the 0.9 reduction for the triangular compression stress area...

Here are my results for the NA position as shown in your example: Concrete Steel Total Axial 446.8 -257.2 189.6 kN Mx 78.3...

It's hard to tell if your results are right or not. That's the problem with 3D plots! I have attached a 2D interaction diagram for 3...

I am not sure what you mean by "the point where they cross", but as sticksandtriangles suggested, if you must have a 3D plot, you have...

I find that surprising. If the axial load is applied with a small eccentricity, and increased in small steps with geometric...

Just remember, the resultant forms the hypotenuse of a right angled triangle, so it must be longer than either of the two components.

The calculation of Mx and My is correct. -0.48^2 = +0.23, so the resultant moment should be (2.074+0.23)^0.5 =1.52 kNm. You could also...

A couple of points: 1. I see where you are coming from, but there is no need to calculate the strain at the centroid and check the...