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Foundation Rocking

Foundation Rocking

Foundation Rocking

(OP)
Perhaps this is a silly question, but can somebody explain what implies the term rocking in foundation seismic retrofit?

RE: Foundation Rocking

It's when the seismic load on a building is capped by the foundation lifting off from the ground rather than by yielding of the superstructure. Link. Think shear walls tipping over. As the theory goes, once your reach a level of force that would rock the foundations in this way, no further force can be absorbed by the structure. For me, the challenge has always been coming up with a suitably conservative, but still useful, determination of how much load induces rocking.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: Foundation Rocking

(OP)
Thanks KootK. Looks like rocking can be related to "Foundation yielding". However, not sure if that can be considered as the ultimate geotechnical capacity of the foundation.

RE: Foundation Rocking

Quote (Okiryu)

Looks like rocking can be related to "Foundation yielding".

That might be possible but I'm accustomed to it essentially meaning whole building tipping / overturning without the wholesale yielding of foundation elements or the supporting soil.

Quote (Okiryu)

However, not sure if that can be considered as the ultimate geotechnical capacity of the foundation.

I would think not but, then, I'm not a geotechnical expert and I many not fully appreciate the meaning behind the terminology that you're using.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

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