What is the term for a construction method where two vertical posts support a horizontal beam?

The term for a construction method where two vertical posts support a horizontal beam is known as "post and lintel." This architectural system is one of the oldest and most fundamental in the history of construction, used across various cultures and time periods.

In this method, the vertical posts are referred to as "posts," while the horizontal beam that spans between them is called the "lintel." This simple yet effective structural arrangement allows for the distribution of weight from the lintel down to the posts, creating open spaces and supporting roofs or upper structures.

The significance of the post and lintel system lies in its straightforward design, which provides stability and support. Many iconic structures, including ancient temples and modern buildings, utilize this principle, demonstrating its lasting relevance in architecture.

Other choices mentioned—like arch and beam, truss system, and braced frame—represent different architectural techniques that involve various configurations and structural mechanics. However, none of them accurately describe the direct relationship of two vertical posts supporting a single horizontal beam as clearly as the post and lintel method does.