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box-girder section
Posted: 14 Mar 2012, 12:05
by 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?
Re: box-girder section
Posted: 15 Mar 2012, 02:00
by 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.
Re: box-girder section
Posted: 15 Mar 2012, 14:33
by bassking
Are you sure? The inertia of the same section calculated with autocad, with baricentrical axis give me another value
Re: box-girder section
Posted: 17 Mar 2012, 16:16
by 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
Re: box-girder section
Posted: 23 Mar 2012, 17:48
by 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