Name three fundamental structural systems and explain how they transfer loads.

Name three fundamental structural systems and explain how they transfer loads.

• A. Load-bearing masonry transfers loads through walls; a frame system transfers loads to columns and beams; a truss system uses triangulated members to carry loads to supports.
• B. A shell system transfers loads through the roof only; a damper system transfers loads to the ground; a balloon frame uses masonry.
• C. A cable-net system transfers loads through tension; a post-tension system transfers loads via slabs; a single-wall system transfers all loads to a single element.
• D. A solid-wall system transfers loads through contiguous masses; a slab system transfers loads to foundations; a drum system uses circular members to carry loads.

Answer: (A)

Loads must travel from the building to the ground, and three classic ways to do this are through walls that bear the load, through a skeletal frame of columns and beams, or through a triangulated network of members that carry forces along their axes. In a system where walls carry the load, the mass of the walls themselves acts as the structural element that transfers gravity loads down to the foundation. This is typical of traditional brick or stone construction where the wall thickness provides the necessary strength. In a frame system, a skeleton of columns and beams carries the loads. The frame members transfer loads from the floors and roofs to the columns and then down to the foundations, with bending in the beams and sometimes moment transfer at the connections forming the overall structural behavior. In a truss system, triangulated members carry loads primarily in axial tension or compression. The joints act as nodes, and the forces flow along the straight members toward supports and foundations, making efficient use of material for longer spans. The other options mix ideas that don’t fit these fundamental load-transfer categories, such as suggesting loads transfer only through a roof, or mischaracterizing how certain systems use materials like masonry or how dampers function.

Loads must travel from the building to the ground, and three classic ways to do this are through walls that bear the load, through a skeletal frame of columns and beams, or through a triangulated network of members that carry forces along their axes.

In a system where walls carry the load, the mass of the walls themselves acts as the structural element that transfers gravity loads down to the foundation. This is typical of traditional brick or stone construction where the wall thickness provides the necessary strength.

In a frame system, a skeleton of columns and beams carries the loads. The frame members transfer loads from the floors and roofs to the columns and then down to the foundations, with bending in the beams and sometimes moment transfer at the connections forming the overall structural behavior.

In a truss system, triangulated members carry loads primarily in axial tension or compression. The joints act as nodes, and the forces flow along the straight members toward supports and foundations, making efficient use of material for longer spans.

The other options mix ideas that don’t fit these fundamental load-transfer categories, such as suggesting loads transfer only through a roof, or mischaracterizing how certain systems use materials like masonry or how dampers function.