Structural Drawing — Reinforced concrete (RC) includes embedded steel reinforcement (rebar or welded wire) to carry tensile forces and control cracking.

Introduction / Context:
Concrete is strong in compression but weak in tension. Reinforcing steel (rebar) or welded wire reinforcement is embedded to resist tensile stresses, improve ductility, and control crack widths, making RC the world’s dominant structural material for slabs, beams, columns, and walls.

Given Data / Assumptions:

• Concrete’s tensile strength is a small fraction of its compressive strength.
• Steel reinforcement provides high tensile capacity and bond.
• Design places rebar where tension is expected.

Concept / Approach:
By combining concrete and steel, composite action leverages the strengths of each: concrete handles compression and fire protection; steel carries tension and enables redistribution. Proper cover ensures durability and bond.

Step-by-Step Solution:
1) Identify tension zones from bending and axial forces.2) Detail bars (size, spacing, development) in those zones.3) Provide cover, hooks, and splices as required.4) Check crack control and serviceability.

Verification / Alternative check:
Construction drawings show rebar schedules and bar marks that explicitly define embedded steel in concrete members.

Why Other Options Are Wrong:
Concrete alone is insufficient in tension; aluminum is not the default; reinforcement is functional, not cosmetic.

Common Pitfalls:
Insufficient development length; inadequate cover; misplacing bars away from tension zones.

Final Answer:
Correct