Plastic modulus of a rectangular section

[mathias_peron]

Hi everybody,

When I'm using Section definition to get the plastic modulus of a rectangular section b = 200mm ; h = 10 mm the software gives me Wpl = 4420 mm3.

But I always thought that for a rectangular section, the formula was : b.h2/4 = 5000 mm3.

Can someone explain me where the difference comes from and if the value is correct?

Have a nice day,

Mathias.

[Pawel.Pulak · Accepted solution]

It was related to some approximations when discretizing the shape of section. Improved in 2017 release:

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Regards,

[mathias_peron]

Thank you very much.