Bridge Calculation Question

Question

I find the figure 'Truss Chord Diagram' very confusing. Specifically, I am unsure as to where each label is referring to in regards to the information in the 'T-P Lab Description' file. 

The description states:

One Cover Plate: 28 in. by 1/2 in. è Area = 28in(1/2in) = 14 in²

Four Angles: 6 in. by 4 in. by 3/8 in. è Area = 4*(6in(3/8in)+4in(3/8in)) = 15 in²

Two Webs: 24 in. by 1/2 in. è Area = 2*(24in(1/2in)) = 24 in²

Two Plates: 12 in. by 5/8 in. è Area = 2*(12in(5/8in)) = 15 in²

I would like to know where these pieces are, as I see two labels for Web Plate 1 and Web Plate 2 for example, and do not understand which label goes to which piece. 

Follow-On Question: 

My confusion is more about the difference between a "webplate" and "web" and "plate." The diagrams show "Webplate" but the information in the attached description lists these separately. 

 

Response

The Truss Chord (The top one for your problem) is a “built-up” member composed of a series of steel pieces.  The “example” in the instructions for the lab is supposed to help you understand how to read the labeling on the drawings.  Our expectation is that you’ll look at the drawings and find the label that is similar to the one in the example for the truss chord where the strain gauges are labeled.  You then calculate the cross sectional area of the truss chord as in the example.

There is a diagram in the documents attached to the assignment that shows the typical assembly of a top chord.

To perform the calculation you don’t actually have to know where each piece is in the built-up member, although it’s nice to be able to interpret the code to be able to visualize it.

Web is the technical term for  the long middle piece between the two shorter parallel pieces in an “I” or “H” structural member.  Flange is the term for the shorter pieces.

Webplate probably should have been two words meaning “a plate that forms part of the web of a built-up member”