topic Re: Edge load (API) in Robot Structural Analysis Forum

Edge load (API)

stathiseleftheriadis — Fri, 05 May 2017 15:19:03 GMT

Hi,

Is there a way to assign a linear load on a single edge (29_Edge(4) or a selection of slab edges with the API?

Thanks

Re: Edge load (API)

Romanich — Fri, 05 May 2017 16:19:23 GMT

As far as I know it is not possible to select a single edge like 29_Edge(4) via API.

Re: Edge load (API)

stathiseleftheriadis — Fri, 05 May 2017 16:43:53 GMT

Thanks

Initially, I thought it can be done like this

SDL = (RobotSimpleCase)Robapp.Project.Structure.Cases.Get(10);
// int IL_B = CaseIL.Records.New(IRobotLoadRecordType.I_LRT_UNIFORM);
LoadRecord = (RobotLoadRecord)SDL.Records.Get(1);
LoadRecord.SetValue(System.Convert.ToInt16(IRobotLinearOnEdgesRecordValues.I_LOERV_PX), 0);
LoadRecord.SetValue(System.Convert.ToInt16(IRobotLinearOnEdgesRecordValues.I_LOERV_PY), 0);
LoadRecord.SetValue(System.Convert.ToInt16(IRobotLinearOnEdgesRecordValues.I_LOERV_PZ), -1500);
LoadRecord.Objects.Add(EdgeSelection);

But I'm struggling to get the selection of edges.

I event tried

 LoadRecord.Objects.AddText("29_(4)");

But it's not working

Re: Edge load (API)

Rafal.Gaweda — Thu, 11 May 2017 11:05:49 GMT

Hi @stathiseleftheriadis

Roman is right. It is not implemented in API.

Re: Edge load (API)

stathiseleftheriadis — Mon, 08 May 2017 09:35:05 GMT

Thanks Rafal.

So as an alternative I'm creating small edge panels around the slab with height similar to slab thickness and then I apply FE Uniform load to those (which can be done in API). Do you think that would yield similar results?

Re: Edge load (API)

Rafal.Gaweda — Thu, 11 May 2017 11:04:54 GMT

Dear @stathiseleftheriadis

Exactly !

See example:

https://forums.autodesk.com/t5/robot-structural-analysis-forum/error-2110-problem-with-linear-loads/m-p/5894325#M39207

But you may encounter this:

Objects not assigned to record if macro used more than one time on opened Robot

Re: Edge load (API)

stathiseleftheriadis — Mon, 08 May 2017 09:58:52 GMT

Great. So far I haven't encountered any issues. I'm running it on a recursive algorithm in a case study with balcony loads. I run a test with more than 500 simulations and it was OK.

My only concern was the edge stiffness benefit due to the thickness of the panel but I reckon it would be minimal.

Re: Edge load (API)

Anonymous — Tue, 04 Sep 2018 05:26:53 GMT

Hi @stathiseleftheriadis and @Rafal.Gaweda,

Nice work around to solve the problem. I can create these edge panels along the boundary of the slab, but shouldn't I keep the thickness of these edge panels as less as possible ? Why did you take their thicknesses as equal to the thickness of the base slab?

Re: Edge load (API)

Anonymous — Tue, 04 Sep 2018 06:07:54 GMT

hi @stathiseleftheriadis and @Rafal.Gaweda, I am looking to apply my linear load on these edge panels.

Re: Edge load (API)

Rafal.Gaweda — Tue, 04 Sep 2018 10:27:55 GMT

Hi @Anonymous

As @Romanich mentioned - fake bars there or add lines there and apply loads to them

Re: Edge load (API)

Anonymous — Tue, 04 Sep 2018 10:31:30 GMT

Hi @Rafal.Gaweda

str.Nodes.Create(1, 0, 0, BaseLevel + WallHeight);
str.Nodes.Create(2, 0, B, BaseLevel + WallHeight);
str.Nodes.Create(3, W, B, BaseLevel + WallHeight);
str.Nodes.Create(4, W, 0, BaseLevel + WallHeight);

str.Bars.Create(1, 1, 2);
str.Bars.Create(2, 2, 3);
str.Bars.Create(3, 3, 4);
str.Bars.Create(4, 4, 1);

/Apply dead load of roof slab

RobotSimpleCase deadweight_roof = str.Cases.CreateSimple(5, "Dead weight of roof", IRobotCaseNature.I_CN_PERMANENT, IRobotCaseAnalizeType.I_CAT_STATIC_LINEAR);
deadweight_roof.Records.New(IRobotLoadRecordType.I_LRT_UNIFORM);
IRobotLoadRecord2 LoadRec4 = deadweight_roof.Records.Get(1) as IRobotLoadRecord2;

LoadRec4.SetValue(2, -2000);
LoadRec4.SetValue(11, 1);
LoadRec4.Objects.FromText("1,2,3,4");

This doesn't throw an error. But it doesn't reflect the loading either. I am unable to figure out where I have gone wrong

Re: Edge load (API)

Rafal.Gaweda — Tue, 04 Sep 2018 10:42:11 GMT

Hi @Anonymous

Use :

LoadRec4.Objects.FromText("1 2 3 4");

instead of

LoadRec4.Objects.FromText("1,2,3,4");

Re: Edge load (API)

Anonymous — Tue, 04 Sep 2018 10:51:35 GMT

It doesn't work 😞

Re: Edge load (API)

Anonymous — Tue, 04 Sep 2018 11:40:39 GMT

Is it because I haven't initialised the bars?

Re: Edge load (API)

Rafal.Gaweda — Tue, 04 Sep 2018 12:43:48 GMT

Hi @Anonymous

Try :

RobotLoadRecord LoadRec4 =....

Re: Edge load (API)

Anonymous — Wed, 05 Sep 2018 02:52:40 GMT

Hi @Rafal.Gaweda,

Thank you for your reply. But it still doesn't work. 😞

Re: Edge load (API)

Anonymous — Wed, 05 Sep 2018 04:13:22 GMT

I found the bug. It should be I_LRT_BAR_UNIFORM and not I_LRT_UNIFORM.

Re: Edge load (API)

Anonymous — Wed, 05 Sep 2018 05:24:46 GMT

Hi @Rafal.Gaweda and @Romanich,

How do I assign properties to the bars so that the overall effect on my calculations is minimum? (since the bars shouldn't technically be there in the first place). Any suggestions are welcome

Re: Edge load (API)

Anonymous — Wed, 22 Jul 2020 09:15:14 GMT

Hello,

I am facing the same problem. Can you please share me how you added the edge in your code ..