...
The
...
...
...
allows
...
users
...
to
...
parametrically
...
define
...
several
...
types
...
of
...
girder-bridge
...
systems.
...
This
...
template-based
...
approach
...
streamlines
...
modeling
...
by
...
automatically
...
creating
...
and
...
linking
...
spine,
...
area,
...
and
...
solid
...
components.
...
Bridge-deck
...
specification
...
defines
...
the
...
superstructure
...
cross-section.
...
Layout
...
lines
...
envelope
...
the
...
bridge
...
profile
...
in
...
plan
...
and
...
elevation.
...
From
...
these
...
high-level
...
objects,
...
the
...
bridge
...
modeler
...
generates
...
...
,
...
...
,
...
...
,
...
and
...
other
...
low-level
...
objects
...
which
...
define
...
the
...
computational
...
model.
...
The
...
bridge
...
modeler
...
is
...
ideal
...
for
...
regular
...
and
...
irregular
...
bridge
...
design.
...
For
...
irregular
...
systems
...
developed
...
using
...
...
,
...
the
...
core
...
of
...
the
...
model
...
is
...
best
...
developed
...
using
...
the
...
bridge
...
modeler.
...
Users
...
should
...
then
...
use
...
SAP2000
...
to
...
manually
...
incorporate
...
irregular
...
features
...
outside
...
of
...
the
...
bridge
...
modeler.
...
Users
...
should
...
ensure
...
that
...
manual
...
changes
...
are
...
not
...
overwritten
...
when
...
the
...
parametric
...
definition
...
is
...
changed
...
and
...
the
...
analysis
...
model
...
regenerates.
...
For
...
bridge
...
types
...
without
...
girder
...
systems,
...
including
...
truss,
...
arch,
...
suspension,
...
and
...
cable-stayed,
...
users
...
may
...
create
...
deck
...
and
...
substructure
...
assemblies
...
using
...
the
...
bridge
...
modeler,
...
then
...
detail
...
additional
...
systems
...
and
...
elements
...
outside
...
of
...
the
...
modeler.
...
Sometimes
...
SAP2000
...
alone
...
is
...
best
...
for
...
the
...
entire
...
modeling
...
process.
...
Generally,
...
however,
...
bridge
...
models
...
are
...
best
...
created
...
in
...
the
...
bridge
...
modeler
...
and
...
then
...
enhanced
...
using
...
SAP2000.
...