Question
“My Group is having a difficult time identifying the cross sectional dimensions from the TP Bridge Sketch that you provided us. We found the width and the height from the given drawing, also we have all of our measurements we made of the width, height, and cross sectional dimensions. Are there any tips you can provide us for figuring out how to read the cross sectional dimensions from the TP bridge PDF you supplied us? Thanks for your time.”
Response
You should be able to read the dimensions of the elements of the bridge on the drawings that are contained in the resources folder. One particularly helpful drawing is the one entitled “Continuous Truss Details.
On that drawing and elsewhere a typical notation is 4 Ls 6 x 4 x 3/8. This translates into a statement that member contains four angle pieces (in cross section) with the length of the two legs being 6” and 4”, and a thickness of 3/8”. From that kind of information for each component of the member and an estimate of the length of the member you can calculate its volume and thus its weight.
If you cannot find specific information about a member it’s OK to extrapolate from what you already know – just identify the extrapolation.
Remember that this is an estimate. We expect you to have considerable uncertainty in your results, but still be a plausible to an order of magnitude.
PS. If I were doing this assignment I’d make use of Excel to keep all my parts and pieces orderly.
Jim Mitchell
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