hollow slab

[hilda08]

i changed my hollow slab to a bigger one, but when i did, the ratio for the beams got smaller. shouldent it be lagrer? 

[Rafal.Gaweda]

It depends on stiffeness of whole this system. Play with different slab thicknesses \ beam sizes and look at results.

[hilda08]

i have to have a certian tickness of the slab, but i dont understand why the ratio of the beams got lower when then slab got bigger. 

[Rafal.Gaweda]

[jenyzosin]

When the slab have a biger height, the rigidity of the slab is biger and the beams can't deform.

My advise is to create a thin slab (like 7 or 8 cm ) and the diference of weight (til 30 cm) you give as a surface load on slab. I use this metod when I want to increase the ratio for beams. 

[Artur.Kosakowski]

Hilda,

Please check also:

http://forums.autodesk.com/t5/Autodesk-Robot-Structural/unrealistic-beams/m-p/3390693/

http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Beam-offsets/m-p/3332921/

Hope this help you understand this situation even better.