This is quick example for limit state, calculated with plastic card

This problem has simple analytical solution for limit moment

Mpl = Yield Stress * Plastic section modulus

Using CalculiX you can obtain numerical solution (the limit state when deflection is growing without load increment)

Get files and spreadsheet (LibreOffice with macros) at here

https://yadi.sk/d/6mMnQkKD34nQAj

At some cases composite shell with many integration points should be used for limit state calculation.

See the example at here.

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