May 5, 2021
|
RISAFloor,
New,
Equivalent Uniform Load,
Steel Joists
When
a
steel
joist
has
special
loading
that
requires
extra
consideration,
the
most
economical
solution
may
be
to
use
a
standard
joist
that
is
capable
of
resisting
the
non-standard
or
special
loading.
When
this
type
of
design
arises,
RISAFloor
will
add
an
(SP)
extension
to
the
joist
designation
in
order
to
indicate
that
it
is
resisting
a
non-standard
load.
Because
this
loading
falls
outside
the
normal
design
criteria
for
the
joist
tables,
these
(SP)
joists
may
warrant
further
detailing
by
the
engineer
or
joist
manufacturer
to
insure
adequate
performance.
The
RISAFloor
detail
report
provides
a
Special
Joist
Load
Diagram
which
shows
the
Point
Loads,
Distributed
Dead,
and
Distributed
Live
loads
with
their
magnitudes
and
dimensions.
RISAFloor
will
choose
a
joist
such
that
the
capacity
shear
envelope
of
the
joist
under
a
standard
uniform
load
is
still
greater
than
the
actual
shear
at
all
locations
along
the
length
of
the
joist.
Because
the
joist
will
have
a
shear
strength
greater
than
zero
at
the
midspan
of
the
beam,
the
shear
envelope
for
a
joist
with
a
maximum
uniform
load
capacity
of
W,
would
be
given
by
the
figure
shown
below:
In
addition
to
checking
the
shear
envelope,
the
program
will
make…
