Which structural element commonly uses reinforcement with rebar?

• A. Piers
• B. Columns
• C. Glass
• D. Wood

Answer: (B)

Concrete handles compression well but is weak in tension. Rebar provides the tensile strength that concrete lacks, making the member able to resist cracking and failure under bending, shear, and axial loads. Columns, as vertical members carrying loads from above, constantly face compression but also experience bending and lateral forces. By embedding steel bars along the height and tying them with lateral reinforcement, columns gain ductility, stiffness, and the ability to sustain higher loads without sudden brittle failure. This combination is the hallmark of reinforced concrete columns. Glass is inherently brittle and not designed to be reinforced in this way, and wood relies on different material behavior and connections rather than rebar reinforcement. Piers can be plain or reinforced, but the typical example that clearly uses rebar reinforcement is a reinforced concrete column.