Robot Structural Analysis Forum
Welcome to Autodesk’s Robot Structural Analysis Forums. Share your knowledge, ask questions, and explore popular Robot Structural Analysis topics.
cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

MOVING LOAD REACTIONS

9 REPLIES 9
SOLVED
Reply
Message 1 of 10
ve_75
619 Views, 9 Replies

MOVING LOAD REACTIONS

Hello,

 

I have a problem while generating moving loads.

 

In fact, when i generate a load, i dont understant how the total reaction is determined by the software.

 

In the example enclosed, i have generated a moving load called "eeeeeeeeeee".

 

In theory, the reaction is: R = 50 x 1 x 1 = 50 kN

 

In fact the reaction is 100 kN (twice more)

 

Therefore, i don't understand the first and the last résult (252 kN and 358 kN).

 

Thank you for helping me.

 

 

 

VE

 

Tags (1)
9 REPLIES 9
Message 2 of 10
Rafal.Gaweda
in reply to: ve_75

file please


Rafal Gaweda
Message 3 of 10
ve_75
in reply to: Rafal.Gaweda

Hi,

 

Thank you for your answer.

 

Here's the file

 

 

 

VE

 

Message 4 of 10
ve_75
in reply to: ve_75

Hi,

I made some other tests with a single slab structure. Here's what i found:

 

 - For a load of 150 kN/m² applied on 1.00m x 1.00m, the reaction should be 150 x 1 x 1 = 150 kN ==> Results OK
 - For a load of 150 kN/m² applied on 1.00m x 0.50m, the reaction should be 150 x 1 x 0.5 = 75 kN ==> Results OK
 - For a load of 150 kN/m² applied on 0.50m x 1.00m, the reaction should be 150 x 1 x 0.5 = 75 kN ==> Results OK

 

There is no problem with the reactions.

 

In fact the problem appears when you have a "frame structure".

I've done the same exercice and here's what i found:

 

 - For a load of 150 kN/m² applied on 1.00m x 1.00m, the reaction should be 150 x 1 x 1 = 150 kN ==> Reaction of 300kN (twice more)
 - For a load of 150 kN/m² applied on 1.00m x 0.50m, the reaction should be 150 x 1 x 0.5 = 75 kN ==> Reaction of 150kN (twice more)
 - For a load of 150 kN/m² applied on 0.50m x 1.00m, the reaction should be 150 x 1 x 0.5 = 75 kN ==> Reaction of 150kN (twice more)

 

I don't understand...

 

You'll find the files enclosed (saved without results).

 

 

Thanks for answering,

 

 

VE

 

 

 

 

Message 5 of 10
Rafal.Gaweda
in reply to: ve_75

Solution:

 

selection3.jpg



Rafal Gaweda
Message 6 of 10
ve_75
in reply to: ve_75

Hi,

 

Thank you very much!

It works perfectly.

 

Now, is there any way to do this (chose the object for the application of the moving load) trough API (VBA)?

 

I found this thread: http://forums.autodesk.com/t5/robot-structural-analysis/vba-loads-api/td-p/3232602/highlight/true/pa...

You wrote a code in this page.

 

While creating the moving case you wrote:

 

      ' creating moving load case 

     Set Cas = Robapp.Project.Structure.Cases.CreateMobile(Robapp.Project.Structure.Cases.FreeNumber, "Moving Load Case", I_CN_PERMANENT)

     ' What have i to add? I found this

     Cas.ApplicationPlaneType = I_MCAPT_SELECTION

 

The problem is that i don't manage to select a panel to attribute...

 

Is it possible to have some help please?

 

 

Thank you for answering.

 

VE

 

 

Message 7 of 10
Rafal.Gaweda
in reply to: ve_75

This should work:

 

Cas.ApplicationPlaneType = I_MCAPT_SELECTION
Cas.ApplicationPlaneBars = "3"

 

 

but it does not.

We need to check it



Rafal Gaweda
Message 8 of 10
ve_75
in reply to: Rafal.Gaweda

Hi,

 

Thanks for your answer.

I think I found the solution.

 

In fact, the lines you wrote apparently have to be after the attribution of a case at the end, as follow:

 

Set Cas = robot.Project.Structure.Cases.CreateMobile(505, nom_charge_roulante, I_CN_PERMANENT)

'''' Set route ...

''''''Set Fac ...

''''' Set Vlabel ....

''''' Set Vdata .... 

''''' Set VLoad ....

 

'And then:

 

Robot.Project.Structure.labels.Store VLabel
Cas.Vehicle = moving_load_name 

'/!\ The lines you wrote seem to have to be written after this line, at the end of the case /!\

/!\ The line cas.vehicule = moving_load_name disable the selection, you can see it by doing "step by step" execution in VBA /!\
Cas.ApplicationPlaneType = I_MCAPT_SELECTION
Cas.ApplicationPlaneBars = "3"

It's kind of weird, but it seems to work...

Is it possible for to test it by your own and tell me if it works on your side?

 

 

Thank you,

 

VE

 

 

 

Message 9 of 10
Rafal.Gaweda
in reply to: ve_75

Virgile,

 

You are right! I  tried after Route definitiion...

After Cas.Vehicle  - it works !

 

 



Rafal Gaweda
Message 10 of 10
ve_75
in reply to: Rafal.Gaweda

Great!

 

Thank you for your help.

 

 

VE

 

 

Can't find what you're looking for? Ask the community or share your knowledge.

Post to forums  

Autodesk Design & Make Report