Truss axial force results

[Anonymous]

Hey,

I am having some problems in my truss axial forces results,

The tension member forces is way different than the compression member forces.

Please can you check my model if i have done any mistake

I would appreciate if you can help me

http://www.filemail.com/d/fcnhzigqsdmjzbs

Regards,

[Rafal.Gaweda]

freeze panels
move nodes 2045to2052 onto column 60
This one thing I found. It will not affect trusses I guess.

[Anonymous]

Do you have any clue why i am getting these results on the truss?

[Rafal.Gaweda]

What results on which bars, which case etc?

[Anonymous]

For example bar 258 and 385 ( which are the top and bottom chord of the truss)

for Case U12 the axial force Fx on the top chord ( 258) is very small comparing to the bottom chord (385)

[Rafal.Gaweda]

Top chord is located in concrete slab. Slab transfers almost all forces. Delete bar 258 and you will see only small change in bottom chord forces case 1 : -1225 vs -1175 on bar 385

[Anonymous]

what i have tried to do is deleting the slab; so i have gotten the balance in my truss the top chord and bottom chord forces values are very close now

But an unstability has occured 😞 can you help me again in this

http://www.filemail.com/d/ghvmqdyusjloood

Thanks

[Anonymous]

I have solved the instability issue,
but would like to know if is it possible to draw a slab over the trusses and get these similar values on the top chord for the balance of the truss.