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Fig.2. 1.
Typical seismic block system
A sketch of a typical seismic block system is shown in Fig.2.1.
The block either stands above the lab floor or is mounted in a pit.
In
the example shown,
the springs are in compression.
In
another type of mounting, each corner of the block is
hung from a matched pair
of
springs in tension (Fig.2.2).
Note
that
in
either case the coupling of mass to springs is done in the plane of the cen
ter of gravity .
The mounting bolts for the exciter trunnion can be set into the concrete during pouring,
but a better matching of bolt-holes is achieved if the bolts are welded to a plate and the
plate anchored to the concrete. This can be done as shown In Fig.2.3.
The bolt is pushed through the location hole in the plate from underneath and the head is
welded to the plate. J-bars of
suitable
dimension can be welded on, to anchor the plate
8
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