147 solid vierendeel study

[jobinhio]

• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you fixed a Bug ?
• Have you added the documentation of the example or benchmark ?
• Have you successfully run the example or benchmark?
• Have you documented the results?
• Have you added the images to the documentation?
• Have you added the vtkjs files for 3D visualization in the documentation?
• Have you added the vtkjs files to a Data Management Plateform e.g https://girder.math.unistra.fr

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[jobinhio]

here are the results of displacement solid.

here are the results of principal stresses.

here are the results of tresca criterion.

here are the results of von mises criterion.

[prudhomm]

informations -> information