Analysis Of Earthquake Wave Propagation
In Buildings
Author(s)
H. Kawakami, M. Oyunchimeg & E. A. J. Tingatinga
Abstract
This paper presents a wave propagation modelling analysis of strong motion
records for actual buildings in comparison with an analysis of simple building
models. In previous studies on earthquake response of buildings, vibration
approaches were used more often than wave propagation approaches; thus, wave
propagation through a building has not been investigated enough. We use the
normalized input output minimization (NIOM) method, which can model wave
propagation in multiple linear systems by considering the statistical correlation
among the strong motions at different observation locations. Output wave
models simplified by this method show two clear peaks that correspond to
incident and reflected waves propagating through the building in the vertical
direction. The obtained wave propagation properties, such as wave travel time
and wave amplitude ratio, at each story of the building are found to reflect the
structural properties like rigidity and damping ratio at that story. Further, a new
method for wave-propagation analysis—called evolutionary normalized
input-output minimization—is developed. It models time-variant wave
propagation by considering the time-variant statistical correlation between strong
motions recorded at different levels in the building. In the case of damaged
buildings, the travel time increased during the earthquake; however, in the cases
of undamaged buildings and the elastic model, it remained almost constant
during the earthquake.
Keywords: strong motion records, buildings, wave propagation, wave travel
time, wave amplitude, fundamental period, damping, damage.
Keywords
strong motion records, buildings, wave propagation, wave travel
time, wave amplitude, fundamental period, damping, damage.
Related Book
Other papers in this volume
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