Structural Drawing — A piece mark (unique identifier) should be shown wherever a separately fabricated or handled member appears on the drawings, enabling tracking from shop to site.

Introduction / Context:
Piece marks are the backbone of steel fabrication logistics. Each separately handled member (beam, column, brace, plate assembly) receives a unique identifier that ties the shop drawings, material lists, and erection diagrams together for error-free fabrication and installation.

Given Data / Assumptions:

• Members are fabricated and shipped as distinct pieces or assemblies.
• Shop drawings, cut lists, and bills reference piece marks.
• Erection drawings map locations using the same identifiers.

Concept / Approach:
Consistent piece marking ensures traceability. It reduces site errors, supports quality control, and simplifies changes. Without it, parts could be misplaced or installed incorrectly.

Step-by-Step Solution:
1) Assign a unique piece mark to each separately handled member.2) Show the mark on detail and erection drawings.3) Stamp or tag the mark on the physical member in the shop.4) Use the mark for delivery, staging, and installation sequencing.

Verification / Alternative check:
Field crews reference piece marks to pick, position, and bolt the correct member in the correct bay and elevation.

Why Other Options Are Wrong:
Restricting piece marks to columns or adding them after erection defeats their purpose; they identify members, not paint color.

Common Pitfalls:
Reusing marks; inconsistent notation between drawings and tags; illegible stamping.

Final Answer:
Correct