Community
I added very simple test file where are 3 situations (plate and steel beams, plate and steel beams with offset, and steel beams with cladding). I expect that result should be like using cladding but if there is a plate the bending moment in steel beam ise much smaller than using just a cladding.
They are not the same for two reasons:
1. Part of the bending is transferred by the slab
2. For the slab model the 'stiffness' of the beams is "smaller" than for the cladding model as they are defined at the same level as the panel. For the offset solution you get axial force (tension) instead of bending.
You may try:
1. Use the orthotropic definition of the slab's thickness with the reduced stiffness coefficient in the direction of the beams
2. Replace HEA200 sections with a user defined one which have increased IY value
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.
Artur Kosakowski
What about calculation of required reinforcement for orthotopic plate? Should I change something?
Reinforcement will be calculated for the internal forces obtained during static analysis of a model with the orhothropic slab defined assuming the indicated thickness of the slab.
The question is what kind of connection between the beams and the slab you actually have and if you 'can' assume that the slab works in one direction only.
Can I use the same solution if there are concrete beams?
IMHO for 'offsets' yes but I'd rather assume that the slab works in both directions.
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.
Artur Kosakowski
If I have a beams in both direction (plate works in two-way) then I can't use plate orthotrophy.
In such case there is no need to do so.
And if I want to calculate beams also then the increased Iy is not an option also.
Steel or concrete beams?
Artur Kosakowski
For RC:
http://forums.autodesk.com/t5/Robot-Structural-Ana
http://forums.autodesk.com/t5/Robot-Structural-Ana
For steel: do you intend to design your deck as a composite (steel beam working together with a concrete slab) or a deck is only a load for steel beams?
Artur Kosakowski
1. Define beams with the increaxded value of Iy
2. Calculate a model
3. Create a group for each beam sepatrately or for selection of beams for which you want to use the same section
4. Assign the sections you want to perform the design for to each of the groups
5. Run group verification or design
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.
Artur Kosakowski
Can't find what you're looking for? Ask the community or share your knowledge.
Post to forums
![Autodesk Design & Make Report](https://forums.autodesk.com/t5/image/serverpage/image-id/1350519iCB55845EBFC43016/image-size/large?v=v2&px=999" "Autodesk Design & Make Report")