Hollow slabs self weight

[Stilie87]

I discovered that by using hollow slabs in Robot the self weight is not calculated correctly. I Would like to use Hollow slabs to get the right load-distrubution and the correct shear/bending stiffnesses.

Moments should be around 140 kNm ant not ~60 as shown in the file.

What is wrong?

Is the Hollow-slabs parameters not correct.

[Rafal.Gaweda]

My = robot calculations according your thickness data

[Stilie87]

So you can not use Hollow slabs if you want to calculate the correct moments?

[Rafal.Gaweda]

???????????????
It is correctly calculated according to data you entered to robot. This data is not coherent to your drawing dimensions so...

Examples:

hole - circular vs elipsoid

distance between holes centers 224 vs 150

thickness of plate 265 vs 500

etc

[Stilie87]

OK

So what is the correct parameters to put into the hollow slab to get the correct stiffnesses and the correct self weight ( 6,6 kn/m¨2) ??

[Artur.Kosakowski · Accepted solution]

or exclude this panel from self-weight  load list and replace it with the 6.6 uniform load on the panel.

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[saclovitzky]

Hello Artur,

Is this the right way to obtain/input the specified unit weight of Hollow core slab?

I'm just wondering , why you are using "unidirectional ribs" instead of hollow core slab?

Regards,