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{live-template:Test Problem}

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You can solve pendulum problems*Pendulum* systems may be [modeled|kb:Modeling techniques] in [SAP2000 by performing|sap2000:home] using nonlinear [time-history|kb:Time-history analysis] analysis with large deflections. 
If you are trying to solve typical structural problems with a pendulum used for isolation or as a tuned-mass damper, this is usually represented by using Typically, the restoring force comes from a linear spring to represent the restoring force. For a pendulum, this could bemodeled either beas a torsional spring at the support, or as a horizontal spring, attached to the free bottomend. Pendulum systems h1.may Screenshotsbe useful Thefor screenshotssimulation belowand andsolution theof attachedisolation videoand show modeling of set of pendulums hitting each other (so called [Newton's cradle|tuned-mass [damper|kb:Damping] problems.

As shown in Figures 1 and 2, a {link-window:http://en.wikipedia.org/wiki/Newton%27s_cradle]). The contact was}Newton's cradle {link-window} pendulum system is modeled using axially stiff [frame|kb:Frame] objects and gap (compression-only) [links|kb:Gap link property DRAFT] connecting each adjacent pairLink], located at the points of ballscontact. However,Attached becauseis thean rodsanimation wereof axiallythe stiff, the gaps contacted nicely.system oscillating.

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!Pendulum_1.png|align=center,border=1!

{center-text}Figure 1 - Newton's cradle pendulum system{center-text}

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!Pendulum_2.png|align=center,border=1!

{center-text}Figure 2 - Newton's cradle pendulum system{center-text}


h1. See Also

* [Contact surface|kb:Contact surface] article


h1. Attachments

* [Pendulum video |Pendulum^Pendulum_video.zip] (zipped .AVI file)

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*ToTO DoDO:* Upload model for test problem with pendulum (by Rob).
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