Circular/elliptical tube

@SHAPE_BUILDER_ANALYSIS {
@SHAPE_BUILDER_NAME {TubeName} {
@SHAPE_GROUP {WALLED_CLOSED}
@SHAPE_TYPE {CIRCULAR_TUBE}
@DIMENSIONS {
@DIMENSION_01 {RoA}
@DIMENSION_02 {RiA}
@DIMENSION_03 {RoB}
@DIMENSION_04 {RiB}
}
@MATERIALS {
@MATERIAL_01 {Mat1}
}
@IS_DEFINED_IN_FRAME {FrameName}
@MESH_DENSITY {md}
@COMMENTS {CommentText}
}
}

Notes

  • ShapeBuilder can generate beam cross-sections in the shape of a circular or elliptical tube. To define a circular/elliptical tube, use the following parameters.
    1. @SHAPE_GROUP: WALLED_CLOSED, and
    2. @SHAPE_TYPE: CIRCULAR_TUBE.
  • The base section is a circular or elliptical tube, as illustrated in figs. 1 and 2, respectively. No options are available for this shape.
  • Sectional shapes are defined in their own local coordinate system, which is assumed to coincide with the global coordinate system. If a fixed frame, FrameName, is specified, the local coordinate system coincides with this fixed frame.
  • The mesh density parameter, md, determines the level of mesh refinement. (Default: md = 4)
  • It is possible to attach comments to the definition of the object; these comments have no effect on its definition.

The circular/elliptical tube: base configuration

  • Fig.1 and 2 illustrate the base configurations of the circular and elliptical tube, respectively. No options are available for this shape.
  • The geometric configuration of the circular/elliptical tube if defined by the dimensions listed in table 1, which are also indicated in figs. 1. Dimensions labeled in red are required. Dimensions labeled in blue are optional and are assigned the default value indicated in table 1. If dimension RoB is not defined, RoB = RoA; similarly, if dimension RiB is not defined, RiB = RiA. If RoB = RoA and RiB = RiA, the tube is circular.
Figure 1. Configuration of the circular tube.             Figure 2. Configuration of the elliptical tube.
Component Dimension Symbol Default Nb.
Circular tube Radius RoA required 01
Circular tube Radius RiA required 02
Circular tube Radius RoB RoA 03
Circular tube Radius RiB RiA 04
Table 1. Dimensions defining the geometry of the circular/elliptical tube
  • Zone 1 of the circular/elliptical tube is defined as follows.
    • It comprises the following faces: Quadrant1, Quadrant2, Quadrant3, and Quadrant4.
    • It is associated with material Mat1 , which can refer to material properties or solid properties.