A building is composed of these four primary structural elements.

• A. Foundations, columns, beams and connections
• B. Foundations, walls, roofs, floors
• C. Columns, beams, slabs, joints
• D. Foundations, columns, beams, walls

Answer: (A)

At the heart of how a building stands is the path loads take from the top down to the ground. The four primary structural elements that form this load-path are foundations, columns, beams, and connections. Foundations anchor the building and transfer loads into the soil. Columns carry vertical loads from floors and roofs down to the foundation. Beams span between columns to support floors and roofs, distributing those loads horizontally toward the columns. Connections are the joints that tie these members together, allowing them to act as a single, stable frame and to transfer forces properly throughout the structure.

Other options mix in walls, roofs, or slabs. Walls can be infill or non-load-bearing in many framing systems, and slabs or floors are part of the floor system rather than the essential frame that transfers loads from top to bottom. The listed four elements best capture the primary framework that carries and redirects structural forces.