Ideas for building one assembly to take off the tons of steel in a package using StackCT?
I know what I’m thinking but I bet a lot of you have a better Idea. As my historical data for all of my structural steel budget lines revolve around their relationship to the tons of steel in a package, what would be the best way to do the in house, residential, tonnage of a package with only the Cost Per Ton as an Item? This would exclude installation labor, installation materials (j-bolts, bolts, dry pack, bracing, ect), field welding, and freight. All of these I can relate back once the package tonnage is determined. I have our fabrication sub’s cost per pound for material and fabrication.
I’m thinking four take offs. Columns, beams, baseplates, connection tabs. All use the same assembly and a Count take off. Item groups for either Tons by Volume (plates and tabs) or Tons by PLF (user defined variable). Excluded items above are linked in as Item costs relative to $/Ton to round out the data piped to the estimate worksheet.
I always have to compile three steel numbers per job. The first structural set that comes with the construction set of drawings, the second set after the engineer changes their mind later, and the third design that goes, “I know I told you for the last year that we can engineer those crazy trusses but now that it is time to stamp it, lets add a bunch more steel.”
This will also give me an accurate in house number for vetting and leveling the bids. I do realize that tonnage bought by the fabricator and tonnage delivered is very different but I can work around that.
Any ideas?
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I'm in the same position and I've been meaning to do this myself. I was planning on using item groups so that I could do a member with one take off. EX. Count takeoff, item group drop down to select the member, user defined variable for the height (PLF X Height = Tons), item group for baseplate thickness w user defined variable for the baseplate dimensions (PSF X Dimensions = Tons), tabs done same as baseplates. My fabricators do labor by the pound and buy stock by the ton. My back end metrics all relate back to tons of steel as well. As you said, we can work around overages as some of our larger components are only available in certain lengths and those line items can have a very high waste factor. At least something like this would let us analyze bids easier as we'd have a reasonable starting point.
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