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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 {hidden-content} *Related emailEmail:* * {email:from=bm|to=ok|date=11/15/2010|subject=Initial cable forces|comment=Recommendations for obtaining initial cable forces|id=6357299} {hidden-content} |
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