Posted Thu, 13 Feb 2014 17:59:11 GMT by
Tecozam (customer) is having problems calculating the plastic module and torsion modulus of compound cross sections. In more detail with doble U UPNs (attached a screen shot).
We don´t know if he is doing something wrong or just the software does not calculate these parameters well.
Please help

Attachment: doble us sin torsion ni plasticidad.png

Posted Fri, 14 Feb 2014 10:40:56 GMT by Victor Seiculescu

It is quite difficult to calculate the plastic section modulus for compound sections, unless some experimental data are available in which case the user must enter manually the determined Wpl values.
For compound sections, Advance Design use by default the elastic values for plastic sectional modulus (Wpl). If Wpl cell has the information entered manually by user, then it uses this value instead of Wel.
Also, for compound sections the user must impose manually the cross-section class as Eurocode classification doesn't include these types of cross-sections. You can impose the class in the linear element properties window (Design Experts section > Steelwork Design > Cross section class).

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