When
defining
loads
in
RISA,
you’ll
see
two
live
load
categories:
LL
and
LLS.
Both
are
live
loads,
but
the
preset
load
combinations
incorporate
them
differently.
Understanding
this
difference
helps
you
assign
loads
correctly
and
get
accurate
results.
Quick
Definitions:
LL
=
Live
Load
typical
live
load
that
qualifies
for
lower
load
factor
in
code
0.5
factor
applied
in
applicable
LRFD
load
combinations
from
ASCE
7
Standard
factor
applied
in
applicable
load
combinations
from
NBC
LLS
=
Live
Load
Special
higher
or
special
use
live
load
that
does
not
qualify
for
lower
load
factor
such
as
loading
over
100psf,
garages,
and
assembly
areas.
1.0
factor
applied
in
applicable
LRFD
load
combinations
from
ASCE
7
Increased
load
factor
applied
in
applicable
NBC
load
combinations
Why
There
are
Two
Live
Load
Categories
The
two
categories
exist
to
incorporate
the
different
load
factors
required
for
the
live
load
as
prescribed
in
both
ASCE
7
and
NBC.
In
ASCE
7,
an
exception
is
allowed
for
the
load
factor
applied
to
the
live
load
in
strength
design
(LRFD)
load
combinations.
“The
load
factor
on
L
in
combinations
3a
and
4a
is
permitted
to
equal
0.5
for
all
occupancies
in
which
L0
in
Chapter
4,
Table…
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