steel truss strengethening

[eslah]

Dear all,
I'm currently working on an old 3d steel truss in order to strengthen it. Du to resent renovation, the DLL became heavier and deflections appears on the roof.
The idea is how to strenghen this steel structure? I was proposing a solution with steel cables.
Can somone please help or guide me in this reflection?
In advance thank you.

 

[klaus.]

No..never saw that before..also I dont think it is a good idea ...also it does not strengthen the connection
( Bolt and sleeve )

I dont know how many elements need to be strengthened...if it is only some you can replace them be new and stronger ones....
How old is that SF ?

 

[eslah]

Almost 1/3 are to be strengthened. Th SF is 15 years old.
Connections are in good conditions and by calculation we stil have about 20% to reach the maximum of resistance. The problem is, we have to strengthen it witout removing the roof and with the minimum of works and as faster as we can. A good headache!!

 

[klaus.]

good luck.....
please post the result once it is done.....

 

[eslah]

Sure i'll do it!!
Thanks again

 

[ldeem]

eslah

Have you considered adding a new bottom chord below the existing bottom chord? This would increase the truss depth which would do a lot for your deflection issue.

 

[eslah]

Ideem,
Doing so, it needs a bigger boles and means increase their seize and finally decrease the lenght of the existing chords...

 

[klaus.]

Have you considered adding a new bottom chord below the existing bottom chord? This would increase the truss depth which would do a lot for your deflection issue.

this is not possible to do this with a space frame that kind due to many reasons
in that case it be easier to replace it .....