Right. I was thinking in terms of a completely new building designed to
meet the required level of safety, with a facade that retained the
appearance of the old building.
From: Bob Sullivan
Dave, I've not been able to watch the video but I imagine the rebuild
will be a problem, and that's a shame. I can't imagine how to fix
it. The original materials are so inflexible. Regards, Bob S.
On Tue, Feb 14, 2012 at 11:10 PM, David Mann <[email protected]>
wrote:
On Feb 15, 2012, at 5:04 PM, John Sessoms wrote:
I wonder if it would be possible to build an earthquake resistant
structure while retaining the appearance of the old cathedral?
Depends on the earthquake and the level of resistance. ?The
building codes have different levels of earthquake resistance which
depends on the use of the building. ?Most home/office buildings
only need to allow the safe exit of occupants and it doesn't matter
whether it needs to be demolished afterwards. ?Critical buildings
such as hospitals need to remain safe and fully operational
afterwards. ?I think there are four levels in our codes.
The codes do make assumptions about the nature of the potential
quakes in the region and ours significantly exceeded the model due
to its proximity. ?It's only the short duration of ours that
prevented an order of magnitude more casualties.
If they started with seismic base isolation they'd be a long way
ahead. ?The technology was invented in this country but it's barely
been used here - in our city we have one base-isolated building.
?They say it doesn't add much (if any) cost so I'm hoping they
mandate it for our rebuild. ?In a seminar we went to last year they
described how it was used even for houses in L'Aquila that were
built after their earthquake.
The other suggestion I'd have is to use a flexible material instead
of stone but then you'd change the appearance...
Some have suggested leaving part of it as a memorial ruin. ?I'm in
two minds about that...
Cheers, Dave
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