Which structural element is installed below grade to provide support for other structural elements and to retain soil?

Which structural element is installed below grade to provide support for other structural elements and to retain soil?

• A. Foundation walls
• B. Footers
• C. Pilings
• D. Beams

Answer: (A)

Foundation walls are placed below grade to do two jobs at once: they carry the loads from the structure above and hold back the surrounding soil. The wall transfers vertical forces down to the footing and into the soil, while its continuous surface against the earth acts as a barrier that resists earth pressure, helping keep the interior space dry and stable. Footers mainly spread loads from walls or columns into the soil and don’t themselves retain soil. Pilings transfer loads to deeper, more stable soils but aren’t intended to serve as soil-retaining barriers. Beams are horizontal structural members that support floors and roofs, typically above grade, and don’t function to retain soil. So foundation walls uniquely combine both load-bearing and soil-retaining roles.

Foundation walls are placed below grade to do two jobs at once: they carry the loads from the structure above and hold back the surrounding soil. The wall transfers vertical forces down to the footing and into the soil, while its continuous surface against the earth acts as a barrier that resists earth pressure, helping keep the interior space dry and stable. Footers mainly spread loads from walls or columns into the soil and don’t themselves retain soil. Pilings transfer loads to deeper, more stable soils but aren’t intended to serve as soil-retaining barriers. Beams are horizontal structural members that support floors and roofs, typically above grade, and don’t function to retain soil. So foundation walls uniquely combine both load-bearing and soil-retaining roles.