earthquake
earthquake
(OP)
Hello,
for determination of the acceleration from earthquake, the first natural frequency of the part has to be evaluated to determine, if you have rigid body motion (for a high natural frequencies) or if a response analysis has to be performed.
Which natural frequency is normaly used for this: the undamped or the damped natural frequency ?
Thanks
michael
for determination of the acceleration from earthquake, the first natural frequency of the part has to be evaluated to determine, if you have rigid body motion (for a high natural frequencies) or if a response analysis has to be performed.
Which natural frequency is normaly used for this: the undamped or the damped natural frequency ?
Thanks
michael





RE: earthquake
This is somewhat outside my area, and you're obviously not getting much of a response. I'm assuming that since you posted this in the nuclear forums, you're interested in determining earthquake responses for a nuclear plant.
Have you done a search on the Nuclear Regulatory Commission's website to see if any of the NUREG's or regulatory guides cover your question? I came across a recently issued regulatory guide 1.208, "Performance-Based Approach to Define the Site-specific Earthquake Ground Motion" which references a couple NUREGs (available in the NRC's online electronic system), but I'm not sure whether it addresses your question or not.
Patricia Lougheed
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RE: earthquake