MOVING LOAD REACTIONS

[Anonymous]

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

[Rafal.Gaweda]

file please

[Anonymous]

Hi,

Thank you for your answer.

Here's the file

VE

[Anonymous]

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

[Rafal.Gaweda]

Solution:

[Anonymous]

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

[Rafal.Gaweda]

This should work:

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

but it does not.

We need to check it

[Anonymous]

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

[Rafal.Gaweda · Accepted solution]

Virgile,

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

After Cas.Vehicle  - it works !

[Anonymous]

Great!

Thank you for your help.

VE