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I've created a Schedule/Quantities for steel beams which gives me a count, size and length but i also want a weight for each beam for the given lengths...
I don't understand your issue. Revit claculates the volume of steel in cubic feet. The density of steel is 490 lbs per cubic foot. I believe you have to insert the volume/1 * 490 because of the units that Revit uses. But it should work fine.
The way to do steel tonnages is the length times the weight per foot. I just did a real quick 20x40 building and calculated the weight by hand, then I had Revit calculate it. Revit was low by 5%. That doesn't sound like much, but given the size buildings we do, that is a difference of several tons. We also take our tonnage and increase it by about 10% to account for connections and misc. steel. As such, most of our estimates are right on. If we use this formula, our estimates will be somewhere around 5% low. I guess my issue is that Length times Wt per foot is so simple, all the parameters are in the program, and it's not available to use.
I agree that this should be addressed. In the formula that I stated above, did you use cut legnth of member or the actual length. When doing it by hand you do not use the actual cut length of the member. Depending on your member weights, this could be a significant difference in the total tonnage.
It is an industry standard in this country to calculate steel weights and not volume. It is also an industry standard to use the TOP of footing elevation and not the bottom, but Autodesk has yet to address that issue too.
Also check for rounding mis-calcs. In your schedule props/formatting tab, see if the default Cubic feet rounding of 2 decimal places is still being used. Switch it to 4 decimal places and you'll get a drastically different number.
The totals that the schedule generates are about the same either way but the rounding really shows up in individual beam volume. When my beams were listing as the same CF even though there was a 6" variance, that was a red flag to the accuracy.
I do like this: mass = cut length x cost. And in ''cost'' I give the value kg/m of the element, of course you can use/make any other parameter, but I am to lazy for that. And I wonder why revit does not have such important (kg/m), main paramater for columns, beams, rebars and so on.
