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Error calculating displacements and rotations in beams with hinges #438

@Alvaro-CD

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@Alvaro-CD

Hi,
when you add a hinge in a beam, the displacement and rotations results are incorrect. The bending diagram is correct. This library indicate that the rotation in the hinge is zero, when the value depend of the node of the element that you release.

I have compared the results with analytical calculations and commercial software.

Despite this bug, it's a really good library. Many thanks!

Álvaro.

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