topic Re: Cladding problem in Robot Structural Analysis Forum

Cladding problem

Anonymous — Fri, 31 Mar 2017 23:44:20 GMT

Hi,

1- is it possible to choose how RSA should distribut the laod for load applied on cladding?

2- the generated load fram cladding applied on the beam is as a trapez.. possible to change that to triangular?

3- why is a point load applied in the middle between to beams, distributed unsymmetric?

2- do I need to do something special for movingload on cladding? I have only applied the polyline on cladding.

Thanks.

Re: Cladding problem

Rafacascudo — Sat, 01 Apr 2017 15:13:53 GMT

1- Not sure if it is this what you´re asking but there´s 2 possible distributions . One way or 2 way.

2- Not that I know . Maybe Artur or Rafal ...

3- My opinion . Claddings are good for loads distributed on the whole cladding area . For partially distributed , linear and concentrated loads it can lead to very wrong results , because the distribution is based on tributary areas . So if the a concentrated load is inside an area , the whole force will go to just to the closest edge/side of the cladding . Better explained on the picture below

4-claddings work normally with moving loads , but be aware of what I explained above

Re: Cladding problem

Anonymous — Sat, 01 Apr 2017 15:28:47 GMT

Ahaa, understand the problem about closest edge/side, but for moving load it should me allowed to choose whitch beam carry the load from application plane selection? Does it then distrubute the load symmetric accourding to the position of the load?

Re: Cladding problem

Rafacascudo — Sun, 02 Apr 2017 01:33:22 GMT

Well, did some tests and I found out some interesting things .

Claddings have no influence on the way the load is distributed to the beams . Load will be distributed proportional to the distance to the beams .

For a concentrated load ,it´s better to have 10 bars with 1m length , instead of a 10m beam . Below picture explains it better

You can see by the generated loads and the beams resulting bending moments that dividing the bar in 10 pieces produces a more realistic results scenario

The interesting thing is that a "shell type" structure will not allow a vehicle with linear or surface loads if there is not a meshed panel.

But a Frame 3d structure type will allow a vehicle with linear load(no surprise here) . And even a surface load vehicle will generate loads on bars although the help file says that only a vehicle with concentrated and/or linear loads will generate loads for this structure type (bars)

Below , planar load vehicle on 3d frame structure type

claddings have no influence on this . Loads from vehicle will be generated even if cladding is deleted.

Re: Cladding problem

Anonymous — Sun, 02 Apr 2017 10:41:52 GMT

Thanks, but for a concetrated lod between 2 beam.. should not robot distribute the load as a point load to these 2 beams?

Re: Cladding problem

Rafacascudo — Sun, 02 Apr 2017 12:36:49 GMT

It depends much more on how your structure carry the load to the main girders. Load will only be totally concentrated on the main girders if there are transversal beams carrying the load to them. But then , You should select these transversal bars ,instead ,to be loaded on "application plane"

Play with "tolerance" ,experiment it yourself. See the results , analyse!

http://help.autodesk.com/view/RSAPRO/2017/ENU/?guid=GUID-9DE9BED6-5813-4B3E-95CE-3ECA7AF6A83C

and also explore the help file always!! before coming here. Every single dialog window has a Help button.

Re: Cladding problem

Anonymous — Sun, 02 Apr 2017 22:24:17 GMT

Yeah, have read a lot before asking here..

But when I changed the tolerance, the load between two beams are now distributed as a point load.. but only to one of the 2 beams. Do u know what I should do so the concentrated load between these 2 beams get distributed as a point load to these Two beams, and not only to one og them?

Re: Cladding problem

Artur.Kosakowski — Mon, 03 Apr 2017 07:42:40 GMT

Defining a vehicle with two half of the value loads with certain space between them and set the 'right' tolerance?

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Re: Cladding problem

Anonymous — Mon, 03 Apr 2017 08:39:10 GMT

Hmmm.. I have to do it for many cases so that will be difficult. Have Also to follow the eurocode.. no other method?