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Protecting Wellington Hospital
Alistair Cattanach, a structural engineering consultant from Dunning Thornton-Beca, explains how modelling big earthquakes helped analyse the performance of base isolators. How do scientists know that the new Wellington Hospital will withstand the next big earthquake?
Acknowledgements:
Capital Coast District Health Board
Fletcher Construction
Dunning Thornton-Beca
National Information Service for Earthquake Engineering, University of California, Berkeley
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Transcript
ALISTAIR CATTANACH
A lot of work a lot of testing, physical tests, and computer modeling software which has been used for non base isolation has been through the rigours of time. We have to try and imagine the likely earthquake that come out of the Wellington fault and one of the risks for this site is the Wiretap fault as well. So through Geological and Nuclear Sciences we selected 7 earthquakes which are very similar to what we think will come out of these faults. And we scaled them to give us our 1000 year event which is the one where the hospital has to continue operating, and a 2500 year event which is the extreme event where a hospital still shouldn't slide of its bearings. So we scaled those earthquakes and we ran seven different ones through in the two different directions, so 14 different analysis we had to do. So we are pretty confident with the approach that we use to understand the physics of something that’s a pretty extreme earthquake event.
