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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?

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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.

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  • $\begingroup$ Note that it is possible to conduct a stepped analysis in which you first load until the plastic moment is reached. You then re-analyse the structure with a hinge at this location and with an applied moment equal to the plastic moment to determine the next plastic hinge location. This process is repeated until a mechanism is formed. $\endgroup$ Nov 13 '17 at 20:47

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