Bulletin of Earthquake Engineering,
Год журнала:
2022,
Номер
21(8), С. 3905 - 3922
Опубликована: Окт. 26, 2022
Abstract
We
present
the
results
of
forced-vibration
experiments
performed
at
large-scale
prototype
structure
EuroProteas
founded
on
gravel-rubber
mixture
(GRM)
layers
acting
as
a
means
Geotechnical
Seismic
Isolation
(GSI).
Three
GRM
with
different
rubber
content
per
weight
(0%,
10%,
and
30%)
but
same
mean
grain
size
ratio
were
used
foundation
soil.
Each
GRM-structure
system
was
subjected
to
harmonic
forces
in
wide
range
excitation
frequencies
force
amplitude.
It
found
that
0.5
m
thick
soil
layer
30%
can
effectively
isolate
structure.
The
strong
effect
fraction
expressed
detected
period
elongation
dominating
rocking
component
which
leads
more
“rigid-body”
response
Moreover,
developed
base
shear
moment
are
significantly
reduced
regardless
frequency,
while
increased
damping
important
energy
dissipation
demonstrate
effectiveness
layer.
Overall,
experimental
demonstrated
use
GSI
be
considered
low-cost
alternative
seismic
isolation
technique.
Australian Journal of Structural Engineering,
Год журнала:
2023,
Номер
24(4), С. 265 - 278
Опубликована: Июнь 29, 2023
Base
isolation
is
a
low-damage
seismic
design
strategy
that
can
be
used
for
constructing
resilient
structures.
Geotechnical
(GSI)
new
category
of
emerging
base
techniques
has
attracted
global
interest
in
the
past
decade.
Research
on
GSI
based
rubber-soil
mixtures
(RSM)
focused
structural
performance
under
earthquake
actions,
whilst
there
are
concerns
over
serviceability
limit
states
(SLS)
requirements
relation
to
(i)
human
comfort
strong
winds
and
(ii)
ground
settlement
gravity,
which
may
induce
cracking
durability
issues
This
article
presents
first
study
buildings
constructed
with
GSI-RSM
system.
The
finite
element
model
coupled
soil-foundation-structure
system
been
validated
by
data
recorded
from
geotechnical
centrifuge
testing.
numerical
estimates
have
also
compared
analytical
predictions.
It
concluded
satisfactorily
fulfill
SLS
requirements.
Bulletin of Earthquake Engineering,
Год журнала:
2023,
Номер
21(10), С. 4851 - 4875
Опубликована: Июнь 14, 2023
Abstract
Geotechnical
Seismic
Isolation
(GSI)
is
an
innovative
technique
for
protecting
structures
in
earthquake-prone
areas.
The
main
idea
to
improve
the
foundation
soil
so
that
seismic
energy
partially
dissipated
within
GSI
before
being
transmitted
structure.
Among
other
materials
proposed
improvement,
gravel-rubber
mixtures
(GRMs),
with
rubber
grains
manufactured
from
end-of-life
tires,
have
attracted
significant
research
interest
thanks
their
good
mechanical
properties.
GRMs
also
represent
a
modern
recycling
system
reduce
stockpile
of
scrap
tires
worldwide.
present
study
investigated
numerically
effect
GRM
layer
located
underneath
shallow
foundations
real
structure
typical
reinforced
concrete
building
southern
Italy.
A
Finite
Element
Modelling
(FEM)
was
carried
out
evaluate
overall
static
and
dynamic
behaviour
soil-GRMs-structure
system.
Three
FEM
models
were
performed
without
layer,
varying
thickness
inputs.
comparisons
among
allow
us
assess
performance
as
new
eco-sustainable
solution
isolation
structures.
Geosynthetics International,
Год журнала:
2024,
Номер
unknown, С. 1 - 14
Опубликована: Март 23, 2024
This
study
proposes
soil
bags
filled
with
a
rubber
sand
mixture
(SFRSM)
to
enhance
the
stability
of
layers
for
effective
seismic
isolation.
To
evaluate
dynamic
characteristics
SFRSM,
large-scale
cyclic
simple
shear
tests
were
conducted
investigate
effects
content,
vertical
pressure,
displacement
amplitude,
fill
percentage,
and
laying
scheme.
Furthermore,
shaking
table
carried
out
impact
vibration
intensity
frequency
on
isolation
SFRSM
layers.
The
results
indicate
that
(1)
exhibits
lower
modulus
higher
damping
than
traditional
rubber-sand
layers,
suggesting
superior
energy
dissipation
capabilities.
(2)
influenced
by
percentage
scheme,
indicating
potential
creating
resilient
isolators
suited
various
conditions.
(3)
isolating
efficacy
is
due
its
high-frequency
vibrations,
threshold
reducing
as
more
are
implemented.
In
summary,
these
experimental
provide
evidence
proposed
innovative
strategy
enhances
strength
stiffness
original
layer,
making
it
well-suited
design
applications
in
low-rise
buildings
less-developed
regions.
Geosciences,
Год журнала:
2021,
Номер
11(5), С. 201 - 201
Опубликована: Май 4, 2021
This
paper
analyses
the
effect
of
polyurethane
injections
on
seismic
surficial
response
cohesionless
soils.
For
this
purpose,
dynamic
finite
element
numerical
were
performed
through
GiD
+
OpenSees.
Both
soil
and
composite
material,
resulted
after
expansion
injected
polyurethane,
are
modelled
with
a
nonlinear
hysteretic
constitutive
model.
Based
percentage,
homogenisation
characteristics
was
considered
for
material:
linear
density
damping,
exponential
(experimentally
calibrated)
stiffness.
An
coefficient
quantifies
how
much
expands:
three
coefficients
considered,
each
them
related
to
different
density.
evaluation
foam
stiffness,
stiffness–density
correlation
used,
derived
impact
tests.
Results
showed
that
reduces
accelerations
proportionally
ratio
its
impedance
volumetric
percentage
respect
total
volume.
is
preliminary
indication
design
in
soils
acceleration
reduction.
