...
To
...
simulate
...
a
...
two-span
...
structure
...
which
...
is
...
simply
...
supported
...
under
...
dead
...
load,
...
and
...
continuous
...
under
...
live
...
load,
...
a
...
...
...
load
...
case
...
is
...
defined
...
with
...
five
...
stages,
...
outlined
...
as
...
follows:
...
Stage
...
1:
...
Add
...
two
...
...
objects,
...
one
...
for
...
each
...
span.
...
Stage
...
2:
...
Define
...
frame
...
end
...
releases
...
through
...
Define
...
>
...
Named
...
Property
...
Sets
...
>
...
Frame
...
Releases,
...
then
...
assign
...
these
...
moment
...
releases
...
to
...
the
...
start
...
...
of
...
the
...
second
...
span.
...
Additional information is available in the Staged-construction
...
...
and
...
...
...
articles.
...
Stage
...
3:
...
Apply
...
load
...
to
...
the
...
structure.
...
Response
...
will
...
be
...
as
...
though
...
the
...
system
...
is
...
simply
...
supported.
...
Stage
...
4:
...
Fix
...
the
...
moment
...
end
...
releases
...
which
...
are
...
applied
...
in
...
Stage
...
2.
...
Stage
...
5:
...
Apply
...
additional
...
load
...
to
...
the
...
structure.
...
Response
...
will
...
now
...
be
...
as
...
though
...
the
...
system
...
is
...
continuous.
...
The structural response is presented in Figure 1:
Figure 1 - Structural response
Attachments
...
model (zipped SDB file)
Metadata
Name: Two-span girder simply-supported for DL and continuous for LL
Description: Modeling demonstration for a two-span girder which is simply-supported for DL and continuous for LL.
Program: SAP2000
Program Version: 12.0.1
Model ID: 130