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Using [CSiBridge|csibridge:home], *initial cable forces* may be obtained *for a cable-stayed bridge* by following the process outlined in this article.
h1. Modify undeformed geometry
* Model the final geometry of the bridge in its deformed configuration.
* On the Cable Shape Definition menu, select the option for Relative Undeformed Length.
* Use a nonlinear [load case|kb:Load case] to analyze the bridge under applied dead loads.
* Run analysis again by selecting Analysis > Shape Finding > Modify Geometry. Iterate until deformed shape converges to the geometry desired.
* Extract the [cable|kb:Cable] forces.
h1. Verify cable forces
The procedure used to verify these cable forces is as follows:
* Apply the dead loads and the cable target forces (previously determined), then run a [nonlinear|kb:Nonlinear] static analysis for this loading condition.
* If the cable forces are optimal, then the structure, when modeled in its final configuration, should experience negligible deflection under dead-load and target-cable forces.
h1. Use the unit-load method to tune cable forces
* If deflection is not negligible, then the unit-load method may be manually applied to determine how cable forces should be adjusted.
h1. See Also
* [kb:Accounting for deformed shape in staged construction] article
* [tutorials:Cable-stayed bridge first steps] tutorial
* [kb:Cable-stayed bridge FAQ] article
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*Related Email:*
* {email:from=bm|to=ok|date=11/15/2010|subject=Initial cable forces|comment=Recommendations for obtaining initial cable forces|id=6357299}
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