box-girder section

[bassking]

Hi, i have a question. In the window section, when i choose section type i design a box-girder section. why the 2 and 3 axis are not barycentric?
The inertia of the section is calculted by its bottom, there's a command to make axis barycentric?

[Stelios_Antoniou]

The inertia is calculated by its centre of gravity, as expected. The reason why the axes are not displayed barycentric is to facilitate the input of the reinforcement.

[bassking]

Are you sure? The inertia of the same section calculated with autocad, with baricentrical axis give me another value

[bassking]

Maybe i'm wrong, or i can't use seismostruct probably well... but the value that seismostruct returns to me is the inertia calculated by the bottom of the box-girder section

[Stelios_Antoniou]

Bassking, indeed you are right; after too much effort, we managed to spot a bug in the calculation of EI2. The inertia value was not calculated by the bottom of the section, however there was a type mismatch in the formulae that was giving wrong values (by a factor or 10-20%).The bug will be corrected in the upcoming version of the program.
Many thanks for helping us in improving the software.

Seismosoft Developer