Hi ALL I work with steel structure

[Ayham85]

Hi ALL
I work with steel structure, has any one have any references about POST-TENSIONED STEEL TRUSSES for long spans?
this method of construction reduces the steel up to 50% ( check Telstra Stadium in australia-span 112m ) the idea of this method is to use cables in the bottom chord of the truss to resist the tension forces and reduces the deflection by post-tensioning the cables after assembling the trusses

 

[Ayham85]

sorry I forgot the subject ((POST-TENSIONED STEEL TRUSSES for long spans))

 

[MiketheEngineer]

I am sure this probably has been done. But steel is cheap and labor is high - so I have never seen it here in US. Concrete - yes

 

[ztengguy]

I have seen a similar concept for a airport concourse, but cant remember where.

 

[MiketheEngineer]

If I am not mistaken, the St Louis airport - or the last one I was in - god knows where - uses a threaded steel rod for the bottom chord for trusses. Kind of pretty and seems to work just fine

 

[BAretired]

Sounds like a workable idea. Why not?

BA

 

[hokie66]

The post-tensioned trusses for the Telstra Stadium roof were used in the post-Olympic reconfiguration. Not something which is done everyday.

http://eprints.qut.edu.au/27130/1/27130.pdf

On the other hand, there have been a number of posttensioned arch structures built, mostly as aircraft hangars. The ones I am familiar with were called "Strarch" arches. After a structural failure or two, I think the company went bust.

 

[BAretired]

Extreme care must be taken whenever one is innovating, but lots of companies have gone bust doing the mundane.

BA

 

[steellion]

I believe Dulles Airport in Washington, D.C. uses a system similar to what you are describing for part of its concourse.

 

[JAE]

We used three 4" diameter wire ropes to create bowstring trusses on the Alamodome in San Antonio.
These weren't post-tensioned exactly but were set to length to provide the required camber. I've attached a photo of one of the trusses.