> For the complete documentation index, see [llms.txt](https://docs.openbrim.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openbrim.org/templates/truss-bridge-workflow/loading-tb/loads-tb/prestressing-load-tb/truss-cable-stressing-tb.md). # Truss Cable Stressing \[TB] Applies pretension (jacking force) to selected truss cables at a construction stage. Each cable's **Pretension Force** — set on the Truss Cable object — is applied as an initial-tension load scaled by the stressing percentage, so the cable develops force during staged construction. Because it is an initial-tension load, the final force in the cable equals the applied pretension reduced by the elastic give of the surrounding structure (towers, deck, and other members). Supported in linear and staged-linear analysis; in geometric-nonlinear stages a warning is issued that member forces from the stressing load are not recovered. ## Cable Stressing **Stage:** The construction stage at which the selected cables are stressed. Pick a previously defined Construction Stage. The stressing load is bound to this stage's analysis case, so the cables develop their pretension at — and after — this erection step, and not before. The user must provide a value. **Cables:** The truss cables to stress at this stage, picked from previously defined Truss Cable objects. Only cables with a non-zero Pretension Force develop force; each cable's Pretension Force is set on the Truss Cable itself. The user must pick at least one cable. **Stressing (%) - applied as an initial-tension load of Stressing x Cable Pretension. Member-force recovery is supported in linear/staged-linear analysis; geometric-nonlinear stages report a warning.:** The fraction of each cable's Pretension Force to apply at this stage, as a percentage (100 = full pretension). The applied initial tension equals Stressing × the cable's Pretension Force, so a single stressing object can stress a group of cables to the same fraction of their individual design forces. Use values below 100 for partial or staged stressing, and add a second stressing object at a later stage to re-stress. --- # 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.openbrim.org/templates/truss-bridge-workflow/loading-tb/loads-tb/prestressing-load-tb/truss-cable-stressing-tb.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.