On a structural drawing, what does the notation 'W12x26' indicate?
Correct Answer
B) A steel wide flange 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 in pounds per linear foot. This is standard structural steel nomenclature.
Why This Is the Correct Answer
The 'W' designation is the standard AISC (American Institute of Steel Construction) notation for wide flange steel beams. The first number (12) always represents the nominal depth of the beam in inches, while the second number (26) represents the weight of the beam in pounds per linear foot. This standardized nomenclature is universally used in structural drawings and specifications throughout the construction industry.
Why the Other Options Are Wrong
Option A: A concrete beam 12 inches wide weighing 26 pounds per cubic foot
The 'W' designation specifically refers to steel wide flange beams, not concrete beams. Additionally, the second number (26) represents pounds per linear foot, not pounds per cubic foot, and concrete beam notations follow completely different naming conventions.
Option C: A wood beam 12 inches by 26 inches in cross-section
Wood beam designations are typically shown as actual dimensions (like 2x12 or 6x12) or as engineered lumber designations. The 'W' prefix is exclusively used for steel wide flange beams, and wood beams are never described using the weight per linear foot notation.
Option D: A steel column 12 feet high with 26-inch spacing
Steel columns use different designations and the 'W' specifically indicates a wide flange beam, not a column. The numbers represent depth in inches and weight per linear foot, not height in feet and spacing dimensions.
Memory Technique
'W' looks like a wide flange beam profile when viewed from the end. Remember: Width designation, Depth first, Weight per foot second (W-D-W).
Reference Hint
Look up AISC Steel Construction Manual or structural steel sections in building code references. Chapter on structural drawings and steel beam designations.
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