topic Re: Curved RC wall meshing in Robot Structural Analysis Forum

Curved RC wall meshing

Anonymous — Tue, 15 Aug 2017 16:24:28 GMT

Hi all,

Can't seem to be able to mesh an RC wall which is in in semi-circular shape on plan. Are there any specific meshing options that I'm missing? Screenshot attached.

Thanks,

Re: Curved RC wall meshing

Rafacascudo — Tue, 15 Aug 2017 18:46:40 GMT

No. It should leaving it on automatic. Can you send the model?

Re: Curved RC wall meshing

Rafacascudo — Tue, 15 Aug 2017 18:47:09 GMT

No. It should work leaving it on automatic. Can you send the model?

Re: Curved RC wall meshing

Artur.Kosakowski — Wed, 16 Aug 2017 08:20:31 GMT

Hi @Anonymous

As @Rafacascudo mentioned the program should automatically switch to Coons meshing as Delaunay works for flat panels only but you may select it manually if you want. Make sure about the size of elements too. In addition if there are any other panels adjacent to it you may want to mesh the curved one first using the local meshing option, and then mesh the others.

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.

Re: Curved RC wall meshing

Anonymous — Wed, 16 Aug 2017 08:59:20 GMT

Thanks guys,

I have saved as, in order to isolate the curved wall from any other element. I have managed to create the mesh (attached screenshot of meshing options) but the mesh is not on the actual panel, but follows the points where edges of the panel meet (this will make sense if look at the attached photos)

Re: Curved RC wall meshing

Rafacascudo — Wed, 16 Aug 2017 10:41:45 GMT

It follows the characteristics points of the panel.
The arc should have more points defining it. There are only 3!!!
And make sure they are identical on both ends ( up and below)

Re: Curved RC wall meshing

Anonymous — Wed, 16 Aug 2017 10:53:02 GMT

Thanks for that. However, I don't think that's the issue. Just dug up an archived model for the same job (we have added another floor an couple other minor changes) and the panel is meshed nicely (and the edges are not broken up into characteristic points) - see attached. Also if that was the case, the FE sides would never theoretically be on the curved panel, as they would be straight lines connecting two point of an arc (no matter to how many points you break the edge?)

Re: Curved RC wall meshing

Artur.Kosakowski — Wed, 16 Aug 2017 11:25:50 GMT

Hi @Anonymous

There is no need to create any characteristic points for aches (what you may do instead is to set the number of their divisions) and if there are they should be in the same locations for both top and bottom arches.

Also if that was the case, the FE sides would never theoretically be on the curved panel, as they would be straight lines connecting two point of an arc (no matter to how many points you break the edge?)

As there are no curved surface elements in RSA an arch will always be approximated by number of 'straight/flat) ones.

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.

Re: Curved RC wall meshing

Artur.Kosakowski — Thu, 17 Aug 2017 10:32:51 GMT

Hi @Anonymous

I just wanted to check if you managed to mesh this panel? If not, could you attach the model so that we could check what we could possibly do?

Re: Curved RC wall meshing

Rafacascudo — Thu, 17 Aug 2017 11:43:23 GMT

Sorry , That´s what I meant , number of divisions. I never generate arcs by lines . I always create them using bars.

Re: Curved RC wall meshing

Artur.Kosakowski — Thu, 17 Aug 2017 12:04:29 GMT

Hi @Rafacascudo

You don't need bars

@Anonymous

Will this help?

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.

Re: Curved RC wall meshing

Rafacascudo — Thu, 17 Aug 2017 12:29:58 GMT

I know , but I think is easier to visualize when creating. And more safe ,regarding precision, when you have to attach(snap) other objects to it.

Better snap is always to nodes , when possible

Re: Curved RC wall meshing

Artur.Kosakowski — Thu, 17 Aug 2017 13:04:29 GMT

Hi Rafael,

The old wish to be able to define contours by nodes ...

I wish it was available too

Re: Curved RC wall meshing

Rafacascudo — Thu, 17 Aug 2017 15:27:16 GMT

Maybe it could be done by API. Nodes would have to be on a right numbering sequence .
I am pretty sure Rafal can do it in less than 10min
🙂

Re: Curved RC wall meshing

Anonymous — Thu, 17 Aug 2017 17:28:33 GMT

Hi guys,

Apologies for not replying earlier, unfortunately I was out of the office most day.

I have tried working on that model where I isolated the wall, but still couldn't get the mesh on the wall.

Please see attached two models. An older model where the curved wall has meshed ok (ending '02'), and the newer one where it refuses to mesh (ending '07'). On the newer model there is another floor added, so the wall in question was extended upwards accordingly. . Please keep in mind that these are work in progress models.

Re: Curved RC wall meshing

Artur.Kosakowski — Fri, 18 Aug 2017 08:12:36 GMT

Hi @Anonymous

Try to define the curved panels as separate ones among the floors and make sure that shapes of the arches match with each other.

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.

Re: Curved RC wall meshing

Artur.Kosakowski — Fri, 18 Aug 2017 08:14:21 GMT

Deleted duplicated post.

Re: Curved RC wall meshing

Artur.Kosakowski — Tue, 22 Aug 2017 12:30:15 GMT

Hi @Anonymous

I just wanted to ask if we managed to help you with meshing your model and if yes, ask to mark the best suggestion(s) as the solution(s) so that anybody having the same issue can find them faster. Thank you.

Re: Curved RC wall meshing

Anonymous — Mon, 04 Sep 2017 14:17:05 GMT

Artur,

Thank you for your reply. I have been away for last week and I will jump on this the next couple of days and inform if sorted (or not).

Stephanos