Which term describes the primary metal material used to provide structural support in large buildings?

• A. Wood
• B. Steel
• C. Concrete
• D. Brick

Answer: (B)

Steel is the primary metal material used to provide structural support in large buildings. It forms the building’s skeleton, with columns and beams carrying vertical loads and resisting lateral forces from wind and earthquakes. Its high strength-to-weight ratio allows for long spans and tall structures, and its ductility helps it absorb energy without brittle failure. Steel frames can be prefabricated and erected efficiently, supporting complex designs and multiple stories. Wood can’t sustain the loads or fire performance required for large-scale buildings; concrete is not a metal and, while reinforced concrete is common, it doesn’t provide the same metal-frame skeleton as steel; brick is masonry and not suited for the primary structural frame in large modern constructions.