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pevelor
Posts: 98
Registered: ‎12-12-2011
Accepted Solution

Depressions in slabs

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08-09-2012 01:16 AM

Hi

 

I have a slab with depressions, and I am wondering the correct way of modelling this.

 

What I have done is the following:

1. Define contour of the main slab.

2. Assign thickness to the main slab

Assign_panel.png

 

3. Define a new contour inside the first slab for the depression.

4. Assign thickness for the depression

 

I am afraid the stiffness might be incorrect if the main slab does not have openings where I assign new panels (depressions). In other words, will the stiffness be correct?

 

Regards

Peder

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Artur.Kosakowski
Posts: 4,736
Registered: ‎12-17-2010

Re: Depressions in slabs

08-09-2012 01:29 AM in reply to: pevelor

Yes, it will.



Artur Kosakowski
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Valued Contributor
pevelor
Posts: 98
Registered: ‎12-12-2011

Re: Depressions in slabs

08-09-2012 01:50 AM in reply to: Artur.Kosakowski

Thats what I figured. So in other words, when I create a new panel inside another panel it will create an opening in the main panel....

 

The reason I got concerned I because of the values obtained in rc design

Could you explain why I get higher values where I have depressions? (All slabs have identical material)

 

stiffness_factor.png

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Artur.Kosakowski
Posts: 4,736
Registered: ‎12-17-2010

Re: Depressions in slabs

08-09-2012 02:40 AM in reply to: pevelor

Thats what I figured. So in other words, when I create a new panel inside another panel it will create an opening in the main panel....

It will create a panel with elements of different thickness. If you create a contour then it will create an opening instead.

 

I'm sorry but having only the picture  I'm not able to figure out what you actually modeled. Please check values of displacements and internal forces first to understand the behavior of the structure (make sure that the model behaves as you wanted it to do). The reinforcement is just the secondary result so usually this is not the area you should start your investigation with.

 

BTW: I may be wrong but assuming that you have continues transfer of bending along the slab the same value should cause larger reinforcement in the part with the smaller thickness.



Artur Kosakowski
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