For this Kind of Truss Simulation, is this valid results ?

[yassou]

Hi every body
Some body gave me this truss for simulating in Abaqus:

I follow below procedures:
1)Sketch:

2)Part:

3)Property:

4)Assembly:

5)Step:

6)Load:

7)Mesh:

8)Job:

9)Results:

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I think, Some thing is not right ?!
If i set the "Scale Factor" --> "uniform =1", Something like this will be happen:

Now What is the problem ?
With Best Regards.
yassou.

 

[Avrojet]

I think your truss structure needs another member added between the two main members at the supports.
As it is now, the whole structure will move to the right, there is nothing stopping it.
That, or change your 2nd support to also freeze UX and check the results.

So, I think the simulation results are correct but your basic structure is unstable.

 

[Mustaine3]

Run just a frequency analysis and have a look at the eigenmodes. It looks like soome members are not connected to each other.