On a structural drawing, what does the symbol 'W12x26' represent?
Correct Answer
D) A wide flange beam 12 inches deep weighing 26 pounds per linear foot
The designation 'W12x26' follows the AISC standard for wide flange steel beams, where 'W' indicates wide flange, '12' is the nominal depth in inches, and '26' is the weight in pounds per linear foot. This is standard structural steel nomenclature.
Why This Is the Correct Answer
The designation 'W12x26' follows the American Institute of Steel Construction (AISC) standard nomenclature for structural steel members. The 'W' indicates a wide flange beam, '12' represents the nominal depth of the beam in inches, and '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 without additional reference materials.
Why the Other Options Are Wrong
Option A: A wire mesh reinforcement 12 gauge by 26 inch spacing
Wire mesh reinforcement uses completely different designation systems, typically involving gauge numbers and spacing measurements. The 'W' prefix in structural steel specifically denotes wide flange beams, not wire products. Reinforcement mesh would be specified with different symbols and notation systems on structural drawings, often including 'WWF' (welded wire fabric) designations.
Option C: A welded beam 12 feet long with 26 connection points
This confuses steel beam nomenclature with wood beam sizing conventions. Wood beams are typically designated by actual dimensions (width x depth), but the 'W' prefix specifically indicates steel wide flange beams in AISC standards. Additionally, the '26' in steel nomenclature represents weight per linear foot, not a dimensional measurement in inches.
Memory Technique
Remember 'W-D-W': Wide flange, Depth, Weight per foot. The 'W' always means wide flange beam, middle number is depth in inches, last number is pounds per linear foot.
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