Which statement best describes a post and beam system?

• A. It uses diagonal bracing only.
• B. It uses vertical posts and horizontal beams to form a frame.
• C. It is a rigid arch.
• D. It uses slabs as primary elements.

Answer: (B)

Post-and-beam framing uses vertical posts carrying horizontal beams to form a rigid frame. Loads from floors and roofs are carried by the posts down to the foundation, while the beams span between posts to transfer loads along the frame. This arrangement creates open interior spaces since non-load-bearing walls can be placed freely. It’s distinct from systems that rely solely on diagonal bracing for stiffness, from rigid arches that carry loads along an arched path, or from slabs that serve as the primary structural elements. So, describing vertical posts and horizontal beams forming a frame best captures what a post-and-beam system is.