ProductsAbaqus/Standard TypeModel data LevelPartPart instance Required parameters- ELSET
Set this parameter equal to the name of the element set for which the
section is defined.
Optional parameters- BUCKLING
Include this parameter to indicate that buckling strut response is permitted
for these elements and that the default buckling envelope is to be used. When
this parameter is included, the YIELD STRESS parameter is required to determine
and
on the buckling envelope.
To include buckling strut response with a nondefault buckling envelope, use
the
BUCKLING ENVELOPE option in conjunction with the
FRAME SECTION option and the YIELD STRESS parameter. If both the BUCKLING parameter and
BUCKLING ENVELOPE option are present, the user-defined buckling envelope
takes precedence.
To define effective length factors and added lengths for the first and
second cross-section directions with either the default or nondefault buckling
envelope, use the
BUCKLING LENGTH option in conjunction with the
FRAME SECTION option. To define buckling reduction factors for the first
and second cross-section directions with either the default or nondefault
buckling envelope, use the
BUCKLING REDUCTION FACTORS option in conjunction with the
FRAME SECTION option.
- DENSITY
Set this parameter equal to the mass density per unit volume of the frame
element material. This parameter is needed only when the mass of the element is
required, such as in dynamic analysis or for gravity loading.
- DEPENDENCIES
Set this parameter equal to the number of field variable dependencies
included in the definition of material properties, in addition to temperature.
If this parameter is omitted, it is assumed that the properties are constant or
depend only on temperature.
See Material data definition for more information.
- PINNED
Include this parameter to indicate that these elements have uniaxial
response only; that is, the ends have pinned connections.
If this parameter is used and both the BUCKLING parameter and the
BUCKLING ENVELOPE option are absent, these elements have linear elastic
uniaxial response from the beginning of the analysis. If this parameter is used
and the BUCKLING parameter or
BUCKLING ENVELOPE option are present, these elements have uniaxial response
with buckling and postbuckling behavior in compression and isotropic hardening
plasticity in tension as described by the buckling envelope option from the
beginning of the analysis. The
BUCKLING LENGTH option can be used with this parameter when the BUCKLING parameter or
BUCKLING ENVELOPE option is present.
This parameter cannot be used with the PLASTIC DEFAULTS parameter or with any of the
PLASTIC options.
- PLASTIC DEFAULTS
Include this parameter to indicate that elastic-plastic material response is
included and that all plastic options are created with default values based on
the yield stress defined with the YIELD STRESS parameter. The YIELD STRESS parameter is required when this parameter is used.
To include elastic-plastic material response with user-defined plastic
material response, use one or more (as appropriate) of the
PLASTIC AXIAL,
PLASTIC M1,
PLASTIC M2, and
PLASTIC TORQUE options in conjunction with the
FRAME SECTION option. If the PLASTIC DEFAULTS and YIELD STRESS parameters are omitted, only those plastic options specified
will be included in the elastic-plastic material response.
This parameter cannot be used with the PINNED parameter.
- SECTION
Set this parameter equal to the name of a library section to choose a
standard library section (see
Beam cross-section library).
The following cross-sections are available for elastic frame elements (when
elastic-plastic and buckling strut response are omitted):
BOX, for a rectangular, hollow box section.
CIRC, for a solid circular section.
GENERAL, for a general cross-section (default).
I, for an I-beam section.
PIPE, for a hollow, circular section.
RECT, for a solid rectangular section.
For elastic-plastic material response the only available plastic interaction
surface is an ellipsoid, which is recommended for PIPE cross-sections only. Other cross-section types, except the GENERAL section, can be used at the user's discretion.
For buckling strut response only the PIPE cross-section is available.
- YIELD STRESS
Set this parameter equal to the yield stress for the material making up the
cross-section.
This parameter is required when defining default elastic-plastic material
response with the PLASTIC DEFAULTS parameter and when modeling buckling strut response by using
the
BUCKLING ENVELOPE option or the BUCKLING parameter.
- ZERO
Set this parameter equal to the reference temperature for thermal expansion
(),
if required. The default is ZERO=0.
Data lines for
SECTION=GENERAL- First
line
Area, A.
Moment of inertia for bending about the 1-axis, .
Moment of inertia for cross bending, .
Moment of inertia for bending about the 2-axis, .
Torsional constant, J.
- Second line (optional; enter a blank line if the default values
are to be used)
First direction cosine of the first element section axis.
Second direction cosine of the first element section axis.
Third direction cosine of the first element section axis.
The entries on this line must be (0, 0, −1) for FRAME2D elements. The default for FRAME3D elements is (0, 0, −1) if the first element section axis is not
defined by an additional node in the element's connectivity. See
Frame elements
for details.
- Third
line
Young's modulus, E.
Torsional shear modulus, G. (This value is ignored for FRAME2D elements.)
Coefficient of thermal expansion.
Temperature.
First field variable.
Second field variable.
Etc., up to four field variables.
- Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than four)
Fifth field variable.
Etc., up to eight field variables per line.
Repeat this set of data lines
as often as necessary to define the properties as a function of temperature and
other predefined field
variables.
Data lines for
BOX, CIRC, I, PIPE, and RECT sections- First data line
Element section geometric data. Values should be given as specified in
Beam cross-section library
for the chosen section type.
Etc.
- Second data line (optional; enter a blank line if the default
values are to be used)
First direction cosine of the first element section axis.
Second direction cosine of the first element section axis.
Third direction cosine of the first element section axis.
The entries on this line must be (0, 0, −1) for FRAME2D elements. The default for FRAME3D elements is (0, 0, –1) if the first element section axis is not
defined by an additional node in the element's connectivity. See
Frame elements
for details.
- Third data
line
Young's modulus, E.
Torsional shear modulus, G. (This value is ignored for FRAME2D elements.)
Coefficient of thermal expansion.
Temperature.
First field variable.
Second field variable.
Etc., up to four field variables.
- Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than four)
Fifth field variable.
Etc., up to eight field variables per line.
Repeat this set of data lines
as often as necessary to define the properties as a function of temperature and
other predefined field
variables.
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