When you create homogeneous shell sections, composite shell sections, membrane sections, or surface sections, you can define one or more layers of reinforcement (rebar) by using the Rebar Layers option. You access the Rebar Layers dialog box from the section editor. For more information, see “Defining reinforcement,” Section 2.2.3 of the ABAQUS Analysis User's Manual.
To define rebar layers:
From the Options field of the shell, membrane, or surface section editor, click Rebar Layers.
The Rebar Layers dialog box appears.
Specify the type of rebar geometry.
Choose Constant for a constant rebar spacing.
Choose Angular if the rebar spacing varies as a function of radial position in a cylindrical coordinate system.
Choose Lift equation–based if the rebar spacing and orientation are determined by the tire lift equation.
In the table, enter a row of data for each rebar layer.
Each row should contain the following information:
The name of the rebar layer.
The name of the material forming the rebar layer. Click in the Material column, then click the arrow that appears to display the list of available materials, and select the material forming the rebar layer.
The cross-sectional area per bar.
The rebar spacing in the plane of the section. For angular rebar spacing, specify the spacing angle in degrees. For lift equation–based spacing, specify the spacing in the uncured geometry.
The angular orientation of the rebar (in degrees) relative to the 1-direction of the rebar reference orientation. For lift equation–based spacing, specify the angle in the uncured geometry.
Alternatively, you can specify an orientation name, in which case ABAQUS/CAE assumes a user-defined orientation. You must supply the user subroutine ORIENT that contains the definition of the user-defined orientation for the specified orientation name.
The position of the rebar in the shell thickness direction measured from the middle surface of the shell, positive in the direction of the positive normal to the shell (not applicable for membrane sections or surface sections).
The cord extension ratio, e, (applies only for lift equation–based spacing).
The radius, 
, that describes the position of the rebar in the uncured geometry, measured with respect to the axis of rotation in a cylindrical coordinate system (applies only for lift equation–based spacing).
Click OK to return to the section editor.
