The most common type of structural system is called what?

• A. Post and beam
• B. Frame
• C. Truss
• D. Shell

Answer: (A)

Think of how a building carries its loads: the most common approach is a frame system, a skeleton of vertical columns and horizontal beams that supports gravity and resists sideways forces. This frame setup is versatile and works in steel, reinforced concrete, or wood, giving open interior spaces and flexible layouts while efficiently transferring loads to the foundation. Post-and-beam is a traditional timber arrangement using posts and beams, but it’s not as widely used across modern multi‑story buildings as a full frame system. Trusses are mainly used to span large roof or floor areas within a frame, and shells are curved, thin structures used for specific architectural forms, not the standard structural approach for typical buildings. So the frame system is the most common.