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*
REBAR LAYER
ORIENTATION
This parameter is meaningful only for rebar in general shell, membrane, and surface elements. Set
this parameter equal to the name of an orientation definition that defines the a ngular orientation of
the rebar on the data lines. If this parameter is omitted, the angular orientation of rebar on the data
lines is specified relative to the default projected local surface directions. This param eter is not
permitted with axisymmetric shell, axisymmetric membrane, and axisymm etric surface elements.
Data lines to define rebar layers:
First line:
1. A name that will be used to identify this re bar layer. This name can be used in defining rebar
prestress and output requests. Each layer of rebar m ust be given a separate name in a particular
element or elem ent set.
2. Cross-sectional area of the rebar.
3. Spacing of rebar in the plane of the membrane, shell, or surface elem ent. The value is given as
a length measure unless the GEOMETRY=ANGULAR param eter is specified, in which case
the value should be given in terms of angular spacing in degrees. Sp ecify the spacing in the
uncured geometry if GEOMETRY =LIFT EQUATION.
4. Position of the rebar in the shell section thickness direction. This value is given as the distance
of the reb ar from the middle surface of the shell, positive in the direction of the positive normal
to the shell. This value is modified if the NODAL THICKNESS parameter is included w ith
the
*
SHELL SECTION option for the underlying shell element. This entry has no meaning
for rebar in either membrane or surface elements.
5. Name of the material forming this rebar layer.
6. For three-dimensional shell, membrane, and surface elements, specify the angular orientation
of rebar (in degrees) between the positive local 1-direction and the rebar. Specify the angle in
the uncured geom etry if GEOMETRY=LIFT EQUATION.
The local 1-direction can be defined by using the
*
ORIENTATION optio n and setting the
ORIENTATION parameter equal to the orientation nam e. If the ORIENTATION parameter is
omitted, the local 1-direction is defined by the default projected local surface directions. The
optional ORIENTATION parameter given on the
*
MEMBRANE SECTION and the
*
SHELL
SECTION options has no influenc e on the rebar angul ar orientation.
For axisymmetric shell, axisymm etric membrane, and axisymmetric surface elements, specify
the angular orientation of rebar from the meridional plane in degrees (0° is meridional, 9 0°
is circumferential). Positive rotation is about the positive normal to the shell, membrane, or
surface elem ents.
7. The isoparametric direction from which the rebar angle output will be measured. The default
is 1.
8. Extension ratio, e, for rebar defined with GEOMETRY=LIFT EQUATION. This entry has no
meaning for rebar defined using GEOMETRY=CONSTA NT or G EOMETRY=ANGULAR.
17.11–2
ABAQUS Version 6.1 Module:
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