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when is a shakedown analysis required?

when is a shakedown analysis required?

when is a shakedown analysis required?

(OP)
When is a shakedown analysis required? i.e. when do we need to analyze a structure to its ultimate failure mechanism?  

I hear shakedown analysis mentioned fairly frequently, but it has never been explained to me when this is actually required.  My work is primarily on commercial buildings in a non-seimic zone and I have never heard of such refined analysis used.  

Are there some industrial applications where it is necessary?  Or it is needed for some seismic applications?  I am curious to hear from anyone with experience in performing limit analysis.  Thanks.

RE: when is a shakedown analysis required?

Ultimate failure analysis can be done on anything you want...it just isn't usually done on buildings or static structures.  Manufactured products, fracture critical structures, and other fatigue-oriented structures can benefit from such analyses.

RE: when is a shakedown analysis required?

Shakedown can/should be used for plastic design whenever there is a possiblilty of load reversal.  Lateral loads from wind and 'rigid' frames, for example.  I have a pretty decent power point discription of what it is... I'll try to dig it up later.

Dik

RE: when is a shakedown analysis required?

(OP)
Dik,

I'd be happy to view your powerpoint if you will post it.

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