On a structural drawing, what does the notation 'W12x26' indicate?
Correct Answer
C) A wide flange steel beam 12 inches deep weighing 26 pounds per linear foot
The 'W' designation indicates a wide flange steel beam, where the first number (12) represents the nominal depth in inches, and the second number (26) represents the weight per linear foot in pounds. This is standard structural steel nomenclature.
Why This Is the Correct Answer
The 'W' designation is the standard American Institute of Steel Construction (AISC) notation for wide flange steel beams. In the notation 'W12x26', the 'W' identifies it as a wide flange beam, the '12' indicates the nominal depth of 12 inches, and the '26' represents the weight per linear foot in pounds. This standardized nomenclature is universally used in structural steel design and construction drawings.
Why the Other Options Are Wrong
Option A: A concrete beam 12 inches wide by 26 inches deep
Steel columns use different designations and the numbers don't represent height in feet or gauge thickness. The 'W' specifically indicates a wide flange beam, and the second number is always weight per linear foot, not gauge.
Option B: A wood beam 12 inches by 26 inches in cross-section
Wood beam specifications are shown as actual cross-sectional dimensions (like 2x12 or 6x12) and don't use the 'W' prefix or weight per linear foot designation that's specific to structural steel.
Option D: A steel column 12 feet tall with 26 gauge thickness
The 'W' prefix specifically denotes steel wide flange beams, not concrete beams. Concrete beam notations would typically show dimensions differently and wouldn't use the 'W' designation or weight per linear foot format.
Memory Technique
Think 'W = Wide flange, Weight per foot' - the W tells you it's steel, and steel is sold by weight per foot, not dimensions like wood.
Reference Hint
Florida Building Code Chapter 16 - Structural Design, or AISC Steel Construction Manual for standard steel beam designations
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