On structural drawings, what does the notation 'W12x26' indicate?
Correct Answer
A) A wide flange steel beam 12 inches deep weighing 26 pounds per linear foot
The designation 'W12x26' refers to a wide flange steel beam that is 12 inches deep and weighs 26 pounds per linear foot. This is standard structural steel nomenclature.
Why This Is the Correct Answer
The 'W12x26' designation follows the standard American Institute of Steel Construction (AISC) nomenclature for wide flange steel beams. The 'W' indicates it's a wide flange beam, the '12' represents the nominal depth of the beam in inches, and the '26' represents the weight of the beam in pounds per linear foot. This standardized system allows engineers and contractors to quickly identify beam specifications from structural drawings.
Why the Other Options Are Wrong
Option B: A steel column 12 feet tall with 26 inch spacing
This is incorrect because 'W' specifically denotes steel wide flange beams, not wood beams. Wood beams are typically shown with actual dimensions like '2x12' or nominal lumber sizes.
Option D: A wood beam 12 inches by 26 inches
This is incorrect because 'W' does not refer to concrete beams, and the notation doesn't indicate width or weight per cubic foot. Concrete beams are typically dimensioned differently on drawings.
Memory Technique
'W' for Wide flange, first number is 'Way deep' (depth), second number is 'Weight per foot' - remember the phrase 'Wide, Way deep, Weight per foot'
Reference Hint
Look up structural steel designations in the AISC Steel Construction Manual or the structural steel section of building codes (typically Chapter 22 in IBC)
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