Light Gauge Steel Portal Frame ??? 1

[TekEngr]

I am designing a theater in light gauge steel structure which clear span is 17 m, length is 30m and height is 3.8m.
So my question is that does this possible in light gauge steel structure by using the Light gauge steel portal frames @ 5m bay spacing as shown below because i don't want to use the trusses in short spacing , however we don't have internal partition walls for strap bracing.

For this scheme C150-1.55 section will be enough for the portal frame???

 

[DaveAtkins]

It is definitely possible, but I don't think it is a good idea. There will be A LOT of labor involved in building a portal frame out of cold formed members.

Why not go with a pre-engineered metal building?

DaveAtkins

 

[TekEngr]

Our company basically deal in light gauge that is why my boss dont want this in hot rolled. You can advise me any doc which is helpfull for design of this type of portal frames in LGS

 

[CANPRO]

I didn't take a close look at the links below - but they look like they might get you started in the right direction. Google is your friend.

http://scholarsmine.mst.edu/cgi/viewcontent.cgi?article=1602&context=isccss

http://mmcengineer.com/DEM_Portal_Frame.pdf

 

[XR250]

I agree with DaveAtkins. Just because your company specializes in this does not make it a good idea. This would be a tough design and detailing job for even the most experienced designer - which you are not (no offense intended).

 

[BUGGAR]

Canpro: Interesting how much ductility they achieve with the light gage steel haunches.

Shahg: Have you researched AISI requirements? What are your thoughts on the MMC trusses?

 

[OlafTheBlack]

Technically, you can make such a structure. I would expect it to be labor intensive cutting and welding lots of light weight pieces. One drawback is that light gauge metal is thin and easily damaged say from forklifts. Another is the surface to volume ratio of light gauge compared to hot rolled steel is much higher. This means the steel will heat up and lose strength faster in a fire. Who would buy that?

 

[CANPRO]

seems like the most difficult areas to design/construct out of light gauge steel would beam the haunches. I wonder if you could have the haunches made of plate steel (typical rigid frame style) and then attach the truss-like roof and column members with bolts.