Simulating Seismically Isolated Buildings Under
Earthquake-induced Pounding Incidences
Author(s)
P. C. Polycarpou & P. Komodromos
Abstract
Seismically isolated buildings usually experience large horizontal relative
displacements during strong earthquakes due to the flexibility that is
incorporated, through seismic bearings, at their bases. If the available clearance
around a seismically isolated building is, for any reason, limited, then there is a
possibility of the building pounding against adjacent structures. This paper,
presents a methodology for simulating this problem using numerical methods, in
order to investigate the effects of potential pounding on the overall seismic
response of seismically isolated buildings.
Keywords: seismic isolation, earthquake, pounding, impacts.
1 Introduction
Seismic isolation is usually based on the incorporation of flexible elastomeric
bearings, typically at the base of a building, in order to shift its fundamental
period outside the dangerous for resonance range of periods and avoid resonance
with the induced earthquake excitation. However, strong seismic actions cause
large horizontal relative displacements at the isolation level of seismically
isolated structures due to the excessive flexibility that is provided through the
seismic bearings. Therefore, a wide clearance, known as \“seismic gap”, must be
provided around a seismically isolated building in order to accommodate the
expected large horizontal displacements during a strong earthquake.
Nevertheless, the width of the provided seismic gap cannot be unlimited due to
practical constraints, especially in cases of retrofitting existing structures. In
addition, it is widely accepted that there are several uncertainties about the
characteristics of the expected earthquake and the methods of estimating the
Keywords
seismic isolation, earthquake, pounding, impacts
Related Book
Other papers in this volume
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