The Empire State Building is a quintessential example of which structural system?

• A. Reinforced Concrete
• B. Timber Frame
• C. Masonry
• D. Structural Steel Framed

Answer: (D)

The main idea here is how tall buildings carry their loads. The Empire State Building uses a structural steel frame, meaning a grid of steel columns and beams forms the skeleton that supports the floors and roof. The exterior masonry is attached to this frame and does not bear the vertical loads. This steel skeleton lets the building rise tall with slender members and allows the walls to be relatively lightweight and non-load-bearing, which was a breakthrough for skyscraper construction in its era.

Reinforced concrete is more typical for mid-rise or more recent tall structures, timber frame is not used for skyscrapers of this height, and masonry alone would require incredibly thick walls to carry the weight and wind loads. The steel frame is the defining system that enabled the Empire State Building’s height and rapid construction.