October 30, 2020
|
RISA-3D,
RISAFloor,
RISA-2D,
Concrete,
RISAFoundation,
New,
Updated Shear Contribution for Concrete (Vc) per A,
Interaction of Shear Forces Acting Along Orthogona,
RISAFloorES
The
new
ACI
318-19
concrete
code
has
been
implemented
into
RISA-3D
v19,
RISAFloor
v15,
RISAFoundation
v13
and
RISA-2D
v19.
To
select
this
code
for
your
design,
simply
choose
them
from
the
Codes
tab
of
the
Model
Settings:
A
summary
of
the
major
changes
that
have
been
incorporated
include:
The
expansion
of
permissible
applications
for
high-strength
reinforcement.
As
a
result,
many
requirements
for
strength
and
ductility
have
been
adjusted.
Some
of
these
requirements
include
but
are
not
limited
to
the
the
strength
reduction
factor,
the
maximum/minimum
flexural
reinforcement
limit,
and
the
axial
compressive
strength
of
columns.
The
calculation
for
the
shear
contribution
of
concrete
(Vc)
in
accordance
with
Table
22.5.5.1.The
calculation
of
Vc
must
consider
axial
load
(Nu)
and/or
the
flexural
reinforcement
ratio
(ρw)
when
Av
>
Av,min.
A
new
size
effect
modification
factor
(λs)
must
be
considered
when
Av
<
Av,min.
The
consideration
for
the
interaction
of
biaxial
shear
forces
in
members
when
Vu/ΦVn
>
0.5
in
both
orthogonal
directions.
New
equations
for
the
allowable
compressive
strength
of
concrete
piles
based
on
the
type
of
pile.
Additional
slab
reinforcement
requirements
at
critical
sections
for
punching
shear.
Refer
to
the
articles
linked
below
for
more
information
on
effects
that
ACI
318-19…
