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Document Description
Title
Bond
characteristics
of
high
strength
concrete
Author
Alavi-Fard
,
Mehdi
,
1959-
Description
Thesis
(Ph.D.)--Memorial
University
of
Newfoundland
,
1999.
Engineering
and
Applied
Science
Date
1999
Pagination
xxii, 254 leaves : ill.
Subject
High
strength
concrete;
Reinforced
concrete;
Chemical
bonds
Degree
Ph.D.
Degree Grantor
Memorial University of Newfoundland. Faculty of Engineering and Applied Science
Discipline
Engineering and Applied Science
Language
eng
Notes
Bibliography:
p.
237-254
Abstract
High
strength
concrete
is
used
mostly
in the
construction
of
bridges
,
high
rise
buildings
and
marine
structures.
Bond
strength
between
high
strength
concrete
and
rebar
is
an
important
factor
in
designing
any
reinforced
concrete
structures
under
various
kinds
of
loadings.
Therefore
, this
study
is
conducted
to
investigate
the
strength
of
bond
between
high
strength
concrete
and
reinforcement
, to
determine
the
internal
distribution
of
stresses
and
strains
along
the
rebar
interface
with
high
strength
concrete.
--
In the
experimental
phase
of this
research
a
total
of
150
specimens
made
of
high
strength
concrete
were
cast
to
investigate
the
bond
strength
under
monotonic
and
cyclic
loading.
The
influences
of
load
history
,
confining
reinforcement
,
rebar
diameter
,
concrete
strength
,
rebar
spacing
,
rate
of
pull
out
, and
deformation
pattern
were
investigated
experimentally
for
reinforcement
bars
of
25
mm
and
35
mm
diameter.
The
internal
concrete
strains
close
to the
contact
surface
and also the
steel
rebar
strains
were
measured.
The
test
set
up
,
load
application
,
instrumentation
and
measurement
,
test
procedure
, and
type
of
materials
were
designed
to
measure
accurate
strains
and
deformations.
Several
specimens
with
different
rebar
diameters
and
rib
geometries
were
tested.
The
range
of the
tested
concrete
compressive
strengths
was
between
75
MPa
and
95
MPa.
The
rib
geometries
were
examined
for
rebar
with
nominal
diameter
of
25
mm
and
35
mm.
--
The
test
results
revealed
that the
maximum
bond
stress
of
high
strength
concrete
is
higher
than the
corresponding
one
for
normal
strength
concrete.
However
, the
behavior
of
high
strength
concrete
is
more
noniinear-brittle
and
it
must
be
considered
in the
bond
model.
The
development
of a
new
technique
of
strain
measurement
around
the
steel
rebar
was
unique
and
it
can
be
useful
to
identify
the
internal
crack
pattern
and to
predict
possible
failure
modes.
The
area
under
the
curve
of the
bond
stress-slip
curve
can
define
the
bond
energy.
The
bond
energy
should be
used
to
evaluate
the
bond
behavior
rather
than the
maximum
bond
stress.
A
new
expression
for
calculating
bond
stress
based
on the
cubic
root
of
concrete
strength
is
recommended
and the
results
are
compared
with
similar
equations.
Also
, the
influences
of
several
parameters
under
cyclic
loading
condition
are
investigated.
--
In the
numerical
investigation
, an
attempt
has been
made
to
consider
the
effect
of
tension
stiffening
in the
material
model.
The
concepts
of
bond
energy
,
fracture
energy
,
tension
softening
and
biaxial
failure
envelope
of
high
strength
concrete
were
applied
in the
development
of a
material
model
for
high
strength
reinforced
concrete.
The
improved
model
is
implemented
in the
UMAT
subroutine
for
use
with the
ABAQUS
finite
element
program.
In
addition
,
three
dimensional
rebar
element
was
added
to the
program
in
order
that the
new
model
will be
able
to
analyze
reinforced
high
strength
concrete
structures.
The
model
has been
checked
against
several
standard
problems.
Further
, A
new
parametric
study
based
on the
effect
of
bond
energy
on the
fracture
energy
was
introduced.
Based
on
sensitivity
analysis
, the
results
were
applied
to
analysis
of
slabs
with
low
,
moderate
and
high
steel
ratio.
The
modified
model
can
be
used
to
analyze
reinforced
high
strength
concrete
members
Type
Text
Resource Type
Electronic
thesis
or
dissertation
Format
Image/jpeg;
Application/pdf
Source
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifier
a1358239
Rights
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
Collection
Electronic
Theses
and
Dissertations
Scanning Status
Completed
PDF File
(28.84
MB)
--
http://collections.mun.ca/PDFs/theses/Alavi-Fard_Mehdi.pdf
CONTENTdm file name
86168.cpd
