A load path is the route forces travel through connected structural elements to reach supports, foundations, or the ground.
Definition
A load path describes how forces move through a connected structural system. For example, floor forces may pass to beams, then columns, foundations, and supporting soil. The route depends on the structure's layout, materials, connections, and supports. For an engineering firm, clarifying load paths helps define analysis, design coordination, and responsibilities at interfaces between disciplines or specialty components. Changes to an element or connection can affect other parts that carry the same forces, so project documents and reviews may need to account for those interfaces. Firms may describe a load path at the level of an overall system or trace specific forces through individual components, depending on the scope. A load path is not a load combination, which specifies how multiple load types are considered together. Nor does identifying a route alone show that each component has adequate capacity. The design criteria and project responsibilities establish what must be evaluated.
How owners use it
- Use load path diagrams to explain how forces travel through a system to supports.
- Clarify which party evaluates connections or components at interfaces, especially where design is delegated.
- If 4 floor loads transfer to beams and 4 beam reactions transfer to columns, the path has 4 transfers at each stage, for 8 transfer steps total.
