Applied Sciences,
Год журнала:
2024,
Номер
14(22), С. 10283 - 10283
Опубликована: Ноя. 8, 2024
In
this
work,
the
seismic
response
of
a
multi-story,
multi-bay
special
truss
moment
frame
(STMF)
with
Ni-Ti
shape
memory
alloys
(SMAs)
incorporated
in
form
X-diagonal
braces
segment
is
investigated.
The
diameter
SMAs
per
diagonal
each
floor
was
initially
determined,
considering
expected
ultimate
strength
segment,
developed
when
reaches
its
target
drift
and
desirable
collapse
mechanism,
i.e.,
formation
plastic
hinges,
according
to
performance-based
design
procedure.
To
further
investigate
structure
incorporated,
half
calculated
SMA
diameters
were
introduced.
Continuing,
three
more
cases
investigated:
mean
value
introduced
at
(case
DC1),
case
DC1
DC2),
twice
CD3).
Dynamic
time
history
analyses
under
seven
benchmark
earthquakes
conducted
using
commercial
nonlinear
Finite
Element
software
(SeismoStruct
2024).
Results
presented
top-displacement
histories,
force–displacement
curves,
maximum
inter-story
drifts,
calculating
also
displacements.
analysis
outcomes
highlight
potential
be
considered
as
novel
material
retrofit
steel
structures.
Both
approaches
exhibit
certain
amount
effectiveness,
depending
on
distribution,
placement
bars
excitation
considered.
Further
research
suggested
fully
understand
capabilities
use
dissipation
devices
Applied Sciences,
Год журнала:
2024,
Номер
14(6), С. 2504 - 2504
Опубликована: Март 15, 2024
This
study
presents
a
detailed
comparative
analysis
of
different
methods
for
evaluating
seismic
response
in
structures,
focusing
on
maximum
displacements
and
collapse
assessment.
The
results
obtained
through
modal
spectral
analysis,
non-linear
dynamic
the
incremental
pushover
applied
to
specific
structure
are
compared.
It
has
been
found
that
choice
time
step
consideration
ductility
critical
obtaining
accurate
predictions.
building’s
indicate
an
earthquake
equivalent
one
affected
city
Lorca
(southeast
Iberian
Peninsula)
2011
would
have
devastating
impact
studied
structure,
highlighting
importance
finite
element
method
modelling
predicting
formation
plastic
hinges
assessing
structural
safety.
These
findings
highlight
utilising
multiple
approaches
fully
understand
behaviour
structures
ensure
adequate
resistance
stability
extreme
events.
Journal of Earthquake and Tsunami,
Год журнала:
2024,
Номер
18(06)
Опубликована: Июнь 30, 2024
This
paper
investigates
numerically
the
seismic
behavior
of
multi-degree-of-freedom
(MDOF)
systems
with
novel
2–4
direction
and
displacement-dependent
(2–4DDD)
Displacement-Velocity-
(2–4DVD)
Semi-Active
(SA)
controls.
study
builds
upon
SA
2–4DDD
control
system,
in
which
damper
forces
are
controlled
by
inter-story
drifts.
For
first
time,
this
an
MDOF
system
A
3-story
steel
frame
is
modeled
OpenSees
then
subjected
to
real
earthquake
records.
The
considering
three
systems:
(i)
conventional
passive
nonlinear
viscous
dampers
(NVDs),
(ii)
dampers,
(iii)
a
new
2–4DVD
damper.
Parametric
studies
conducted
determine
optimal
parameters
designed
frames.
New
design
methodologies
for
controls
also
proposed.
results
discussed
terms
drift,
base
shear
force,
acceleration,
dissipated
energy
required
force.
Results
from
Nonlinear
Time
History
Analyses
show
that,
compared
traditional
NVDs,
drifts
up
72%
32%
lower,
respectively.
reduces
damping
acceleration
60%
87%,
respectively,
control.
It
shown
that
was
not
stable
high-frequency
Conversely,
leads
smoother
force
changes
between
quadrants
case
investigated
paper.
contributes
toward
development
retrofitting
systems.
Applied Sciences,
Год журнала:
2024,
Номер
14(22), С. 10238 - 10238
Опубликована: Ноя. 7, 2024
U-shaped
seismic
dampers,
passive
metallic
devices
that
dissipate
energy
by
cyclic
plastic
deformation,
are
designed
to
mitigate
the
effects
of
loads
on
structures.
This
study
focuses
development
an
advanced
computational
model
a
damper,
chosen
for
its
unique
design
variable
thickness
and
width,
which
contributes
superior
performance.
The
simulation
uses
nonlinear
finite
element
analysis
bilinear
hardening
calibrated
actual
stress–strain
curve
low-carbon
steel.
To
ensure
accuracy,
rigorous
mesh
convergence
is
performed
quantify
numerical
prediction
errors
establish
suitable
predicting
local
deformation
phenomena,
including
strain
stress
fields,
throughout
displacement-based
loading
protocol.
Mesh
sensitivity
analysis,
examining
equivalent
cumulative
strain,
derives
damper
hysteresis
confirms
criteria
within
experimentally
observed
response
range
material.
resulting
novel
contribution
provides
reliable
predictions
inhomogeneous
dissipation,
essential
optimizing
performance
through
more
sophisticated
damage-fatigue
models
guarantee
lifetime
damper.
