Structural steel cost curve

[vvaccare]

I've been tasked with trying to come up with an optimal span cost analysis for an owner. Typically, the architects have governed the locations of columns and beam spans, but I actually have freedom in choosing this go round. Of course, cost is the main concern. I know the larger my spans, the deeper my beams may get, but this may be offset by needing fewer columns and foundations. I also know by keeping my spans shorter that I'd be able to use shallower beams, but this would result in more columns and foundations, which could also drive up the cost.

Would any one be able to point me in the right direction to come up with some sort of cost analysis to try and come up with some sort of optimal span?

Thank you all.

 

[msquared48]

You would also have to factor in the transportation costs, number of picks, size of crane(s), crane rental costs, decking cost (ribbed steel decking). How detailed to you want to get? A good local steel contractor might have some hard data on that.

If you want to do it yourself, you might want to start with the Means Structural System costs catalog.

Mike McCann, PE, SE (WA)

 

[vvaccare]

For the time being, I was going to focus on just the beam and column costs to te and get a very rough estimate. I'll check out the mss catalogs in the mean time.

 

[KootK]

~30' o/c grids seems to work well. I recommend getting your hands in this paper and patterning your work from it Link. It's a very detailed version of the same exercise. At minimum, it'll make you look like a wizened genius for having thought of everything imaginable.

Here's an Internet freebie: Link

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[JAE]

AISC does this for you for free I think. Check with them in Chicago.

I would second msquared48's point about not forgetting the labor, picks, etc. These affect the overall costs to a similar degree as the materials do.



Check out Eng-Tips Forum's Policies here:
faq731-376

 

[jdgengineer]

AISC used (amd im assuming still does) to have a floor study software which could quickly calculate veams and girders (including vibration) to help estimate different configurations to determine which is optimal.