ProductsAbaqus/StandardAbaqus/ExplicitAbaqus/CAE TypeModel data LevelPartPart instance Abaqus/CAEGeneral beam sections with linear
response are supported in the
Property module. Required parameters ELSET
Set this parameter equal to the name of the element set for which the
section is defined.
Required parameter in
Abaqus/Explicit,
optional parameter in
Abaqus/Standard DENSITY
Set this parameter equal to the mass density (mass per unit volume) of the
beam material. In an
Abaqus/Standard
analysis this parameter is needed only when the mass of the elements is
required, such as in dynamic analysis or gravity loading. This parameter cannot
be used when SECTION=MESHED.
Optional parameters DEPENDENCIES
This parameter cannot be used when SECTION=NONLINEAR GENERAL or SECTION=MESHED.
Set this parameter equal to the number of field variable dependencies
included in the definition of material moduli, in addition to temperature. If
this parameter is omitted, it is assumed that the moduli are constant or depend
only on temperature.
 LUMPED
This parameter is relevant only for linear Timoshenko beam elements in
Abaqus/Standard.
Set LUMPED=YES (default) to use a lumped mass matrix in frequency extraction
and modal analysis procedures.
Set LUMPED=NO to use a mass matrix based on a cubic interpolation of
deflection and quadratic interpolation of the rotation fields in frequency
extraction and modal analysis procedures.
 POISSON
Set this parameter equal to the effective Poisson's ratio for the section to
provide uniform strain in the section due to strain of the beam axis (so that
the crosssectional area changes when the beam is stretched). The value of the
effective Poisson's ratio must be between −1.0 and 0.5. The default is POISSON=0. A value of 0.5 will enforce
incompressible behavior of the element.
For PIPE elements with SECTION=PIPE, this parameter will also be used along with the Young's
modulus given on the third data line to compute the axial strain due to hoop
strain.
This parameter is used only in largedisplacement analysis. It is not used
with element types B23, B33, or the equivalent “hybrid” elements (which are available only in
Abaqus/Standard).
 ROTARY INERTIA
This parameter is relevant only for threedimensional Timoshenko beam
elements.
Set ROTARY INERTIA=EXACT (default) to use the exact rotary inertia corresponding to the
beam crosssection geometry in dynamic and eigenfrequency extraction
procedures.
Set ROTARY INERTIA=ISOTROPIC to use an approximate rotary inertia for the crosssection. In
Abaqus/Standard
the rotary inertia associated with the torsional mode of deformation is used
for all rotational degrees of freedom. In
Abaqus/Explicit
the rotary inertia for all rotational degrees of freedom is equal to a scaled
flexural inertia with a scaling factor chosen to maximize the stable time
increment. ROTARY INERTIA=ISOTROPIC is not relevant and cannot be used when SECTION=MESHED; the default value of EXACT always applies for meshed sections.
 SECTION
Set SECTION=GENERAL (default) to define a general beam section with linear
response.
Set SECTION=NONLINEAR GENERAL to define general nonlinear behavior of the crosssection.
Set SECTION=MESHED to define an arbitrarily shaped solid crosssection meshed
with warping elements.
Set this parameter equal to the name of a library section to choose a
standard library section (see
Beam crosssection library).
The following crosssections are available:
ARBITRARY, for an arbitrary section.
BOX, for a rectangular, hollow box section.
CIRC, for a solid circular section.
HEX, for a hollow hexagonal section.
I, for an Ibeam section.
L, for an Lbeam section.
PIPE, for a hollow, circular section.
RECT, for a solid, rectangular section.
TRAPEZOID, for a trapezoidal section.
 TAPER
This parameter is relevant only for
Abaqus/Standard
analyses.
Include this parameter to define a general beam section with a tapered
crosssection.
 ZERO
This parameter cannot be used when SECTION=MESHED.
Set this parameter equal to the reference temperature for thermal expansion
(${\theta}^{0}$),
if required. The default is ZERO=0.
Data
lines for SECTION=GENERAL First
line
Area, A.
Moment of inertia for bending about the 1axis, ${I}_{11}$.
Moment of inertia for cross bending, ${I}_{12}$.
Moment of inertia for bending about the 2axis, ${I}_{22}$.
Torsional constant, J.
Sectorial moment, ${\mathrm{\Gamma}}_{0}$.
(Only needed in
Abaqus/Standard
when the section is associated with opensection beam elements.)
Warping constant, ${\mathrm{\Gamma}}_{W}$.
(Only needed in
Abaqus/Standard
when the section is associated with opensection beam elements.)
 Second line (optional; enter a blank line if the default values
are to be used)
First direction cosine of the first beam section axis.
Second direction cosine of the first beam section axis.
Third direction cosine of the first beam section axis.
The entries on this line must be (0, 0, $1$)
for planar beams. The default for beams in space is (0, 0,
$1$)
if the first beam section axis is not defined by an additional node in the
element's connectivity. See
Beam element crosssection orientation
for details.
 Third
line
Young's modulus, E.
Torsional shear modulus, G. (Not used for beams in a
plane.)
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 SECTION=GENERAL if the TAPER parameter is included First line (properties of node
A)
Area, A.
Moment of inertia for bending about the 1axis, ${I}_{11}$.
Moment of inertia for cross bending, ${I}_{12}$.
Moment of inertia for bending about the 2axis, ${I}_{22}$.
Torsional constant, J.
Sectorial moment, ${\mathrm{\Gamma}}_{0}$.
(Only needed in
Abaqus/Standard
when the section is associated with opensection beam elements.)
Warping constant, ${\mathrm{\Gamma}}_{W}$.
(Only needed in
Abaqus/Standard
when the section is associated with opensection beam elements.)
 Second line (properties of node
B)
Area, A.
Moment of inertia for bending about the 1axis, ${I}_{11}$.
Moment of inertia for cross bending, ${I}_{12}$.
Moment of inertia for bending about the 2axis, ${I}_{22}$.
Torsional constant, J.
Sectorial moment, ${\mathrm{\Gamma}}_{0}$.
(Only needed in
Abaqus/Standard
when the section is associated with opensection beam elements.)
Warping constant, ${\mathrm{\Gamma}}_{W}$.
(Only needed in
Abaqus/Standard
when the section is associated with opensection beam elements.)
 Third line (optional; enter a blank line if the default values
are to be used)
First direction cosine of the first beam section axis.
Second direction cosine of the first beam section axis.
Third direction cosine of the first beam section axis.
The entries on this line must be (0, 0, $1$)
for planar beams. The default for beams in space is (0, 0,
$1$)
if the first beam section axis is not defined by an additional node in the
element's connectivity. See
Beam element crosssection orientation
for details.
 Fourth
line
Young's modulus, E.
Torsional shear modulus, G. (Not used for beams in a
plane.)
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 SECTION=NONLINEAR GENERAL First
line
Area, A.
Moment of inertia for bending about the 1axis, ${I}_{11}$.
Moment of inertia for cross bending, ${I}_{12}$.
Moment of inertia for bending about the 2axis, ${I}_{22}$.
Torsional constant, J.
The axial and bending behaviors of the section are defined by using the
AXIAL,
M1,
M2,
TORQUE, and
THERMAL EXPANSION options.
 Second line
(optional)
First direction cosine of the first beam section axis.
Second direction cosine of the first beam section axis.
Third direction cosine of the first beam section axis.
The entries on this line must be (0, 0, $1$)
for planar beams. The default for beams in space is (0, 0,
$1$)
if the first beam section axis is not defined by an additional node in the
element's connectivity. See
Beam element crosssection orientation
for details.
Data
lines for SECTION=MESHED First
line
First direction cosine of the first beam section axis.
Second direction cosine of the first beam section axis.
Third direction cosine of the first beam section axis.
The entries on this line must be (0, 0, −1) for planar beams. The default
for beams in space is (0, 0, −1) if the first beam section axis is not defined
by an additional node in the element's connectivity. See
Beam element crosssection orientation
for details.
 Second
line
The entries on this line and the
following line consist of the beam section properties that result from the
twodimensional meshed crosssection generation procedure. The properties are
written to the file jobname.bsp
during the crosssection generation and are typically read into a subsequent
beam analysis using the
INCLUDE option. See
Meshed beam crosssections
for details. Axial stiffness of the section, $\left(EA\right)$.
Bending stiffness about the 1axis of the section, ${\left(EI\right)}_{11}$.
Stiffness for crossbending, ${\left(EI\right)}_{12}$.
Bending stiffness about the 2axis of the section, ${\left(EI\right)}_{22}$.
Torsional constant, $\left(GJ\right)$.
 Third line
Total mass of the section per unit length, $\left(\rho A\right)$.
Rotary inertia about the 1axis of the section, ${\left(\rho I\right)}_{11}$.
Rotary product of inertia, ${\left(\rho I\right)}_{12}$.
Rotary inertia about the 2axis of the section, ${\left(\rho I\right)}_{22}$.
Local 1coordinate of the center of mass, ${x}_{1cm}$.
Local 2coordinate of the center of mass, ${x}_{2cm}$.
Data
lines for BOX, CIRC, HEX, I, L, PIPE, RECT, and TRAPEZOID sections First line
Beam section geometric data. Values should be given as specified in
Beam crosssection library
for the chosen section type.
Etc.
 Second line (optional; enter a blank line if the default values
are to be used)
First direction cosine of the first beam section axis.
Second direction cosine of the first beam section axis.
Third direction cosine of the first beam section axis.
The entries on this line must be (0, 0, $1$)
for planar beams. The default for beams in space is (0, 0,
$1$)
if the first beam section axis is not defined by an additional node in the
element's connectivity. See
Beam element crosssection orientation
for details.
 Third
line
Young's modulus, E.
Torsional shear modulus, G. (Not used for beams in a
plane.)
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, HEX, I, L, PIPE, RECT, and TRAPEZOID sections if the TAPER parameter is included First line (properties of node
A)
Beam section geometric data. Values should be given as specified in
Beam crosssection library
for the chosen section type.
Etc.
 Second line (properties of node B)
Beam section geometric data. Values should be given as specified in
Beam crosssection library
for the chosen section type.
Etc.
 Third line (optional; enter a blank line if the default values
are to be used)
First direction cosine of the first beam section axis.
Second direction cosine of the first beam section axis.
Third direction cosine of the first beam section axis.
The entries on this line must be (0, 0, $1$)
for planar beams. The default for beams in space is (0, 0,
$1$)
if the first beam section axis is not defined by an additional node in the
element's connectivity. See
Beam element crosssection orientation
for details.
 Fourth
line
Young's modulus, E.
Torsional shear modulus, G. (Not used for beams in a
plane.)
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 SECTION=ARBITRARY First
line
Number of segments making up the section.
Local 1coordinate of first point defining the section.
Local 2coordinate of first point defining the section.
Local 1coordinate of second point defining the section.
Local 2coordinate of second point defining the section.
Thickness of first segment.
 Second line
Local 1coordinate of next section point.
Local 2coordinate of next section point.
Thickness of segment ending at this point.
Repeat the second data line as
often as necessary to define the ARBITRARY section.
 Third line (optional; enter a blank line if the
default values are to be used)
First direction cosine of the first beam section axis.
Second direction cosine of the first beam section axis.
Third direction cosine of the first beam section axis.
The entries on this line must be (0, 0, $1$)
for planar beams. The default for beams in space is (0, 0,
$1$)
if the first beam section axis is not defined by an additional node in the
element's connectivity. See
Beam element crosssection orientation
for details.
 Fourth
line
Young's modulus, E.
Torsional shear modulus, G. (Not used for beams in a
plane.)
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.
