Can you name this structural roof system?

[cedent]

We are doing some minor modifications to this hollow corrugated concrete structural system. The corrugations are used as ducts... so at the center of each of the corrugations, there is a penetration in the supporting concrete beam.

 

[dik]

Nice... it looks like a folded plate a bit...

Dik

 

[cedent]

The system spans 70 feet between beams.

 

[BAretired]

Agree with dik...folded plate.

BA

 

[dik]

Span is consistent with a folded plate... main rfg at top and bottom 'points' with adjacent plate providing lateral support (like a series of arches). Matter of taking a look at the last panel to see how it is braced.

Dik

 

[structuresguy]

What does it look like from above? Does the roof follow the same ridge/valley pattern as the ceiling? Or is it flat roof, with a flat structural slab over the entire system? I have seen both.

 

[TXStructural]

Page 29 of the Dec 2009 Concrete International pictures a precast system like this. Prestressed, hollow box girders carrying mechanical services inside.

It appears to be this system.