Pendulum Structure ETABS (Support Conditions)

[Rahal008]

Hi, im modelling a pendulum type structure and i am having problems with the analysis, im using ETABS. Could someone please help me to verify if this are the correct support conditions? Because deformed shapes are really not making sense. They are not behaving correctly to dead,live and wind demands. Just in case, the structure is symmetrically in shape and load. The only support condition that exists is on top a pinned support.

 

[driftLimiter]

What is your expected result? What type of analysis are you performing? Is it just the deformed shape or also the magnitudes of the displacement that is unexpected?

Its not clear to me what the loading is, or what the restraint to those loads would be. Have you verified the loads are being combined and applied the way that you think?

In the absence of some restraint or counter balancing force, a lateral load would cause excessive horizontal displacement because the pin support at the top provides no restraint to rotations due to lateral load.

If you are relying on the weight of the structure downward to restrain excessive horizontal displacements it seems to me that you need to consider a non-linear analysis technique.

 

[milkshakelake]

You know that you can't do this in ETABS, right?

 

[BulbTheBuilder]

I haven't done enough rigging to comment but hope this helps

Rigging and Bracing Stability: Considerations for Moving, Lifting and Placing a Non-Building Structural Module