On structural plans, you see a beam labeled "W12x26." What does this designation indicate?
Correct Answer
D) Wide flange beam, 12 inches deep, 26 pounds per linear foot
W12x26 designates a wide flange steel beam that is nominally 12 inches deep and weighs 26 pounds per linear foot. The first number is the nominal depth, and the second number is the weight per linear foot.
Why This Is the Correct Answer
The designation W12x26 follows the standard American steel beam nomenclature where 'W' indicates a wide flange beam, '12' represents the nominal depth in inches, and '26' represents the weight per linear foot in pounds. This is the universal system used in structural engineering and construction drawings. The beam is approximately 12 inches deep and weighs 26 pounds for every foot of length.
Why the Other Options Are Wrong
Option A: Wood beam, 12 inches wide, 26 inches deep
This completely misinterprets the designation. 'W' stands for wide flange beam, not wire mesh. The numbers refer to depth and weight per foot, not gauge and spacing measurements used for reinforcing mesh.
Option B: Wide flange beam, 12 inches deep, 26 inches wide
This misidentifies the material entirely. 'W' specifically designates wide flange steel beams, not wood beams. Additionally, it incorrectly interprets both numbers as dimensional measurements rather than depth and weight per foot.
Memory Technique
Remember 'W = Wide flange, Weight follows' - the W means wide flange steel beam, and the number after 'x' is always the weight per linear foot, never width.
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