October 29, 2020
|
RISA-3D,
RISAFloor,
Concrete,
RISAFoundation,
New,
v15,
v19,
RISAFloorES,
v13
The
new
ACI
318-19
code
has
been
implemented
into
RISA-3D
v19,
RISAFloor
v15,
and
RISAFoundation
v13.
One
of
the
biggest
changes
between
the
ACI
318-14
code
and
the
ACI
318-19
code
is
the
shear
contribution
provided
by
the
concrete,
Vc.
ACI
318-14
In
ACI
318-14,
a
simplified
equation
for
the
calculation
of
Vc
could
be
used
unless
there
is
axial
force
present
in
the
member.
The
area
of
shear
and
flexural
reinforcement
in
the
cross
section
was
not
a
consideration
when
determining
the
shear
strength
contribution
of
concrete
using
the
simplified
equation.
ACI
318-19
Now,
in
ACI-318-19,
the
calculation
of
Vc
is
dependent
on
whether
the
area
of
shear
reinforcement
provided,
Av,
is
lesser
or
greater
than
the
minimum
area
of
shear
reinforcement
required,
Av,min.
When
Av
>
Av,min,
the
axial
load
and
the
flexural
reinforcement
ratio
are
included
in
the
calculation
of
Vc.
ACI
allows
us
to
use
the
larger
of
the
results
from
equation
(a)
and
(b)
in
the
table.
In
RISA-3D
detail
report,
this
calculation
will
be
presented
in
the
shear
design
tab:
When
Av
<
Av,min,
ACI
318-19
introduces
a
new
variable,
the
size
effect
modification
factor,
λs.
Experimental
tests
have
indicated
that
the
shear
strength…
