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Re: Base Isolators

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Lead provides damping and is self annealing.  After being displaced a
relatively large amount, a lead core bearing must be jacked back to the
central position.  Lead isn't used in a high damping rubber bearing. The
steel plates cause the axial stiffness to be on the order of 15 to 25 times
the lateral stiffness, depending on the thickness to diameter ratio of the
rubber between the plates.

----- Original Message -----
From: <Francis.Ang(--nospam--at)toyota.com.ph>
To: <seaint(--nospam--at)seaint.org>
Sent: Wednesday, November 03, 1999 12:31 AM
Subject: Base Isolators


> I have some questions regarding the typical base isolators. Base Isolators
> are
> using lead for their core. Any ideas why lead is being used ? Why not
steel?
> I
> have to admit that I am not familiar with base isolation devices. And the
> steel plate between the rubber plate; Are these ordinary steel plates or
do
> they have some properties that are unique for base isolation devices. The
> same question applies to the rubbers.
>
> Any comments or suggestions would be greatly appreciated.
>
> Thanks.
>
> A. Yango
> CE/SE
> TMP
>