Is it possible to determine plastic hinge location of a frame in SkyCiv? Is it also possible determine moment -curvature relationship curve in SkyCiv? If yes, how?
What you are after is a physically (material) non-linear analysis of a frame. From the SkyCiv documentation:
The SkyCiv Non-Linear solver only takes into account geometric non-linearities.
You can use the linear elastic moment distribution to determine the point at which the first plastic hinge will occur (the point with the largest bending moment). However, without a physically non-linear analysis, you will not be able to model what happens after the first plastic hinge forms in one analysis run.