Bending moment concentration on slab

[Mirko.Jurcevic]

I there a way to avoid this moment concentrations in sharp corners of the slab? I am attaching my model.

I've made similar model (more "rectangular") so I can compare results and results are more-less similar.

Still, I have some doubt in such results (with concentrations). My opinion is that those points somehow have higher rigidity or something so they "drag" a lot of load to themselfs and because of that results (moments) in other places are smaller than they should be. Am I right?

I tried with emiters and smaller FE size, but as expected I get even higher values in those places.

Opinions, experiences?

[Artur.Kosakowski]

I can't think of any other solution but creating a support with assigned size in the corner and display results with the reduction over supports.

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[Mirko.Jurcevic]

Thanks Artur!

I was expecting increase of bending moment values (and reinforcement) in the middle of the slab but I get the same values.

I wasn't sure if the rest of the slab acts "correctly", it seems it does.

I hate those concentrations on model such as this because you can't make manual check...

[t.sautierr]

And with elastic releases at the edges? adjust it to adjust the moment. Of course for local study only.

If you adapt inertia of the pannel, same result? if the internia is reduced then moment over support will tend to 0

[Mirko.Jurcevic]

You really think that I know how to do that ?  😉

I am satisfied with the current results, I'll try this when I'll have more time.

Thanks!

[sergey.churilov]

Do you have any other suggestion for sharp corner concentrations?

The same happens when modelling stairs surrounded with RC walls (see red circles in the picture).

You have to shorten the inclined slab width not to connect to the walls, but you have to provide connection of the landings to the wall. And again sharp corners with stress concentrations.

Some other suggestions beside 'artificial node supports'?