Estimating Weight of Steel for Steel Office Building Budget

[RFreund]

I thought AISC used to have a worksheet or some guidelines for estimating the weight of steel for a given bay spacing or height, but I can't seem to find this. Also it seems like steeltools is down or gone? Does anyone have any information like this? This would be for a rough budget or estimate at the begining of a project.

Thanks!


EIT

http://www.HowToEngineer.com

 

[JAE]

SteelTools website link at AISC simply says this: "SteelTools is currently unavailable. Please check back for more information."


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[dik]

Can you calculate it?

Joist depth in inches approx 0.7 * span in feet. 30' span *0.7 = 22" OWSJ...

Moment / 0.9 depth yields force / yield for chord member *3 for top chord, bottom chord and web members divided by the joist spacing gives psf for OWSJ. Steel 3.4 plf per in^2

Weight of beam supporting joists divided by beam spacing gives psf for beams.

Weight of columns * height, divided by tributary area gives psf for column.

Increase the total by 15% to accommodate bracing, bridging and connections...

You should have a total weight of about 8 psf for light flimsy structures and 12 psf for medium industrial structures.

Dik

 

[RFreund]

@JAE - Yeah I've been getting that the last few days. Curious as to what's going on there...

@dik - that's what I ended up doing. For some reason I thought AISC or Steel Tools had some spreadsheet or other tables.

Thanks!

EIT

http://www.HowToEngineer.com

 

[dik]

RFreund: What sort of weight did you end up with?

 

[RFreund]

I ran a five story building, 15' floor height, 25'x25' bays.
For Concrete filled metal deck over steel joists framing between beams i got about 8psf.
For composite metal deck over composite steel beams framing between composite steel girders i got about 6.5psf.

The point load requirement for office space seems to hurt the joist design. The composite metal deck in option 2 was thicker so more Concrete less steel.


EIT

http://www.HowToEngineer.com