January 20, 2016
|
RISA-3D,
RISAFloor ES,
RISAFoundation,
New
The
new
ACI
318-14
code
has
been
implemented
into
RISA-3D
V14,
RISAFloor
V10,
and
RISAFoundation
V8.
One
of
the
big
changes
between
the
ACI
318-11
and
the
ACI
318-14
was
to
minimum
flexural
reinforcement
for
one-way
and
two-way
slabs,
as
well
as
foundation
elements.
In
many
cases
this
has
the
effect
of
increasing
the
required
reinforcement
in
these
elements.
Here
we
will
discuss
why.
ACI
318-11
In
this
code
the
flexural
minimums
are
considered
in
Section
10.5.
Sections
10.5.1
and
10.5.2
are
where
the
minimum
flexural
reinforcement
calculation
is
looked.
For
common
values
of
reinforcement
and
concrete
properties
this
would
result
in
a
rho
=
0.0033.
In
Section
10.5.3
there
is
an
additional
provision
that
allows
you
to
disregard
10.5.1
and
10.5.2
as
long
as
the
area
of
steel
provided
is
at
least
1/3
greater
than
required
by
analysis.
There
has
always
been
a
bit
of
gray
area
as
to
where
this
provision
is
applicable.
In
RISA
this
provision
is
applied
to
all
beam
and
slab-type
elements.
ACI
318-14
This
code
re-arranged
it’s
sections
to
each
element
type
and
thus
updated/clarified
the
language
for
each
element.
Section
7.6.1
&
8.6.1
Minimum
flexural
reinforcement
in
non-prestressed
Slabs.
For
60
ksi
reinforcement…
