> For the complete documentation index, see [llms.txt](https://docs.enercalc.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enercalc.com/efr-user-manual/calculation-types/working-with-beam-calculations/tributary-beams14.md). # Tributary Beams How to confirm tributary beams during beam calculation launch to establish load path, recalc order, and change warnings. After the final approval of all supporting elements, the next step in the beam calculation launch process is to confirm the identity of tributary beams. Tributary beams are defined as beams supported by the main designed beam, which may contribute load that influences the design. Identifying these beams will establish the connective relationships that determine load path, re-calculation order, and change warnings, as well as allowing ENERCALC for Revit to retrieve load-linked reaction forces from upstream calculations. ENERCALC for Revit leverages a variety of information available in the Revit model, including physical solid location of the beam element, line location of the beam element, and proximity to other elements in order to suggest the most probable tributary elements and present them to the user. The calculation launch form will proceed automatically to the “Tributary Beams” tab as soon as the support confirmation is complete. ![](https://4249100372-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgHVzpA9PT0VcuNGp6j39%2Fuploads%2Fgit-blob-95d1498f0f0f57f1bea5f5a6e77d0f0a0ae82f4f%2Fclip0123.png?alt=media) --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.enercalc.com/efr-user-manual/calculation-types/working-with-beam-calculations/tributary-beams14.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.