Reducing Seismic Stress On Buildings Through
Inertia Limiters At Floor Level
Author(s)
M. C. Porcu
Abstract
A seismic stress control method based on the disconnection of non-structural
floor masses during strong earthquakes is investigated in the present paper.
Rigid-plastic devices (very stiff in the elastic range, in practice), which may
plastically yield when a pre-set level of seismic load is reached, are assumed to
connect structural and non-structural floor masses. Such rigid-plastic connectors
act as inertia limiters so reducing seismic loads on building floors. In addition,
they also act as seismic energy dissipaters due to plastic dissipation which is
triggered at the connector level. The method may lead to significant seismic
stress reductions. The price to be paid, however, might be large relative
displacements of the disconnected mass. By referring to a single-storey frame
and to recorded ground motions, a numerical investigation is performed in the
present paper showing that the disconnected mass usually experiences rather
small relative displacements (generally below 10 cm), even when high stress
reductions are achieved. For practical purposes, a useful procedure to obtain a
quick – though approximate – evaluation of the peak relative displacement of the
disconnected mass from the earthquake rigid-plastic pseudo-spectrum is also
provided in the paper.
Keywords: seismic stress control, rigid-plastic connectors, floor mass
disconnection, inertia limiters.
Keywords
seismic stress control, rigid-plastic connectors, floor mass
disconnection, inertia limiters
Related Book
Other papers in this volume
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