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Calculated Tonnage for Structural Steel

Weight in Tons Parameters

Due to Revit structural steel objects using different weight parameters, and the requests for both Imperial and Metric weight, Assemble has modified how weight in Tons or Tonnes is calculated. Models published prior to October 9, 2014, will need to be republished to utilize these modified parameters.

Assemble will provide the Weight in tons by Length, calculated using the length field, as Length x Weight in Lbs / 2000.

    • For Imperial structural steel objects, the Weight in Lbs parameter is identified as W.
    • For Metric structural steel objects beginning with M_, the W parameter is invalid. When using these structural members, we recommend using the Weight in Tons by Volume formula.

Assemble will provide the Weight in ton by Volume, specifically for Metric elements, as Volume x Density (of Iron).

    • For Metric structural steel objects, the Weight in Kg/m parameter is identified as M.

Our Formulas:

Weight By Length:

If we find the object to have Wt property, then Wt(lbs/ft)*L(ft)/2000 = W(T) , where T = Tons.

Else, we look for M property (since we store all quantities in our reference units, we convert M to lbs/ft).  M(kg/m)*L(m)/1000 = W(t) , t = Tonnes

eq. (M*.3048*L(ft))/907.18474= W(T)

If we don’t find Wt or M we look for W and calculate W(lbs/ft)*L(ft)/2000 = W(T). What this means is that if a metric model is published that contains W, our calculation engine will pick the formula using W prior to using the formula with M. Making Weight By Volume a more reliable calculation in such cases.

Weight By Volume:

One formula for all. 

V(cy)*6.615= W(T) here, 6.615 is the density of iron expressed in (T/cy)

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