Associates section type information with a section ID number.

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Section identification number. If SECID is blank or zero, the SECID number is incremented by one from the highest section ID number currently defined in the database. (See Notes for SECID input specific to general contact.)




Defines a beam section.



Defines a tapered beam or pipe section. The sections at the end points must be topologically identical.



Defines a nonlinear general (temperature-dependent) beam section.



Defines a composite (temperature-dependent) beam section.



Defines a pipe section.



Defines a link section.



Define the axis for a general axisymmetric section.



Defines a shell section.



Defines a preintegrated general (temperature-dependent) shell section.



Defines a pretension section.



Defines a joint section.



Defines a reinforcing section.



Defines a contact section.


When Type = BEAM, the possible beam sections that can be defined for Subtype are:

CSOLIDCircular solid
CTUBECircular tube
II-shaped section
ZZ-shaped section
LL-shaped section
TT-shaped section
HATSHat-shaped section
HRECHollow rectangle or box
ASECArbitrary section -- integrated cross-section inertia properties supplied by user
MESHUser-defined mesh -- see the SECREAD command for more information about this data

The following figure shows the shape of each cross section subtype:

When Type = GENB, the possible nonlinear general beam sections that can be defined for Subtype are:

ELASTICThe generalized-stress/generalized-strain relationship is elastic (linear or nonlinear).
PLASTICThe generalized-stress/generalized-strain relationship is elasto-plastic (and allows for permanent deformation).

When Type = COMB, the only possible composite-beam section that can be defined for Subtype is:


When Type = JOINT, the possible joint sections that can be defined for Subtype are:

UNIVUniversal joint
REVORevolute joint
SLOT3-D Slot joint
PINPPoint-in-plane joint
PRISTranslational joint
CYLICylindrical joint
PLANPlanar joint
WELDWeld joint
ORIEOrient joint
SPHESpherical joint
GENEGeneral joint
SCREScrew joint

When Type = REINF, the possible reinforcing sections that can be defined for Subtype are:

DISCDiscrete reinforcing. The reinforcing fibers are arbitrarily oriented and modeled individually.
SMEARSmeared reinforcing. The reinforcing fibers are homogeneous and defined as a membrane.

When Type = CONTACT, the possible contact sections that can be defined for Subtype are:

CIRCLEGeometry correction for a portion of a circle (or nearly a circle).
SPHEREGeometry correction for a portion of a spherical (or nearly spherical) surface.
CYLINDERGeometry correction for a portion of a revolute (or nearly revolute) surface.
NORMALGeometry correction to specify a user-defined contact surface normal.
BOLTGeometry correction for a bolt thread surface.
RADIUSEquivalent beam/edge radius for 3-D beam-to-beam or 3-D edge-to-edge contact in a general contact definition; or radii associated with rigid target segments in a general contact definition.

An eight-character name for the section. Name can be a string such as "W36X210" or "HP13X73" for beam sections. Section name can consist of letters and numbers, but cannot contain punctuation, special characters, or spaces.


Sets mesh refinement level for thin-walled beam sections. Valid values are 0 (the default - no mesh refinement) through 5 (high level of mesh refinement). This value has meaning only when Type = BEAM.


SECTYPE sets the section ID number, section type, and subtype for a section. A previously-defined section with the same identification number will be redefined. The geometry data describing this section type is defined by a subsequent SECDATA command. Define the offsets (if applicable) by a subsequent SECOFFSET command. The SLIST command lists the section properties, and the SECPLOT command displays the section to scale. The SECNUM command assigns the section ID number to any subsequently-defined elements.

When defining a section for contact elements (Type = CONTACT) that are used in a general contact definition, a section number representing a general contact surface can be specified. Alternatively, you may define a subset of a region by inputting a valid label for SECID (ALL_EDGE, ALL_FACE, ALL_VERT, ALL_TOP,or ALL_BOT), or by inputting a node component name with or without a component name extension (_EDGE, _FACE, _VERT, _TOP, or _BOT). For more information, see Applying Surface Geometry Correction in the Contact Technology Guide.

Beam Section Considerations

For a beam section (Type = BEAM), a subsequent SECDATA command builds a numeric model using a nine-node cell for determining the properties (Ixx, Iyy, etc.) of the section and for the solution to the Poisson's equation for torsional behavior. See Beam Analysis and Cross Sections in the Structural Analysis Guide for examples using the section commands.

For a nonlinear general beam section (Type = GENB), the Subtype and REFINEKEY options do not apply. Subsequent commands are necessary to define the section: BSAX, BSM1, BSM2, BSTQ, BSS1, BSS2, BSMD, and BSTE are available. All other section commands are ignored for this section type.

For a preintegrated composite-beam section (Type = COMB), the REFINEKEY options do not apply. Subsequent commands are necessary to define the section: CBTMP, CBMX, CBMD, and CBTE are available. All other section commands are ignored for this section type.

Tapered Section Considerations

For a tapered beam or pipe section (Type = TAPER), two subsequent SECDATA commands are required (one for each end section). Section ends must be topologically identical (same Subtype, number of cells and material IDs). For a tapered pipe section, end sections must have the same number of cells around the circumference and along the pipe wall, and the same shell section ID for a composite pipe wall.

Shell Section Considerations

For a preintegrated general shell section (Type = GENS), the Subtype and REFINEKEY options do not apply. Subsequent commands are necessary to define the section: SSPA, SSPB, SSPD, SSPE, SSMT, SSBT, and SSPM are available. All other section commands are ignored for this section type.

Pretension Section Considerations

The PRETENSION section options of the SECTYPE and SECDATA commands are documented primarily to aid your understanding of the data written by the CDWRITE command. ANSYS, Inc. recommends that you generate pretension sections via the PSMESH command.

Reinforcing Section Considerations

For a reinforcing section (Type = REINF), each subsequent SECDATA command defines the material, geometry, and orientation of one discrete reinforcing fiber (Subtype = DISC) or one smeared reinforcing surface (Subtype = SMEAR). When referenced by a MESH200 element, only one SECDATA command is valid.

Displaying Elements with Section Definition

To display elements with shapes determined from the section definition, issue the /ESHAPE command.

Product Restrictions

ANSYS Mechanical Pro SECTYPE,COMB is not valid.

Menu Paths

Main Menu>Preprocessor>Sections>Axis>Add
Main Menu>Preprocessor>Sections>Axis>Edit
Main Menu>Preprocessor>Sections>Beam>Common Sections
Main Menu>Preprocessor>Sections>Beam>Composite Sections
Main Menu>Preprocessor>Sections>Beam>Custom Sections>Read Sect Mesh
Main Menu>Preprocessor>Sections>Beam>NL Generalized
Main Menu>Preprocessor>Sections>Beam>Taper Sections>By Picked Nodes
Main Menu>Preprocessor>Sections>Beam>Taper Sections>By XYZ Location
Main Menu>Preprocessor>Sections>Contact>Add
Main Menu>Preprocessor>Sections>Contact>Edit
Main Menu>Preprocessor>Sections>Joints>Add / Edit
Main Menu>Preprocessor>Sections>Link>Add
Main Menu>Preprocessor>Sections>Link>Edit
Main Menu>Preprocessor>Sections>Pipe>Add
Main Menu>Preprocessor>Sections>Pipe>Edit
Main Menu>Preprocessor>Sections>Reinforcing>Add / Edit
Main Menu>Preprocessor>Sections>Shell>Lay-up>Add / Edit
Main Menu>Preprocessor>Sections>Shell>Pre-integrated

Release 18.2 - © ANSYS, Inc. All rights reserved.