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Users must assign concentrated [hinges|kb:Hinge] to [frame|kb:Frame] elements which may experience nonlinear behavior. Definition of nonlinear material behavior does not enable plastic behavior, though it is necessary for the generation of the interaction surface and moment-rotation curves which characterize the yield criteria of a nonlinear frame element.


h1. Key steps to modeling hinges

* Define hinge properties using the Define > Section Properties > Hinge Properties menu.

* Assign hinges to nonlinear frame elements using the Assign > Frame > Hinges menu.

* Create a nonlinear [load case|kb:Load case] and run the analysis.

* Use the Display > Show Hinge Results menu to plot hinge deformation against applied loading. Moment vs. plastic rotation is one such option.


h1. See Also

* {new-tab-link:http://www.csiberkeley.com/}CSI{new-tab-link} [_Analysis Reference Manual_|doc:CSI Analysis Reference Manual] (Frame Hinge Properties, page 131)

* Verification Example 1-026, available through Help > Documentation > Analysis Verification > Frames > 1-026 Moment and Shear Hinges

* Habibullah, A., Pyle, S. (1998). _Practical Three Dimensional Nonlinear Static Pushover Analysis_, Computers and Structures, Inc., Berkeley, CA
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