Tube with Fins

@SHAPE_BUILDER_ANALYSIS {
@SHAPE_BUILDER_NAME {TfinName} {
@SHAPE_GROUP {WALLED_CLOSED}
@SHAPE_TYPE {TUBE_WITH_FINS}
@OPTION_DEFINITION {o1, o2}
@DIMENSIONS {
@DIMENSION_01 {Ro}
@DIMENSION_02 {Ri}
@DIMENSION_03 {wf1}
@DIMENSION_04 {tf1}
@DIMENSION_05 {θf2}
@DIMENSION_06 {wf2}
@DIMENSION_07 {tf2}
@DIMENSION_08 {θf3}
@DIMENSION_09 {wf3}
@DIMENSION_10 {tf3}
@DIMENSION_11 {θf4}
@DIMENSION_12 {wf4}
@DIMENSION_13 {tf4}
}
@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 tube with fins. To define a tube with fins, use the following parameters.
    1. @SHAPE_GROUP: WALLED_CLOSED, and
    2. @SHAPE_TYPE: TUBE_WITH_FINS.
  • The base section is an closed circular tube with two fins, as illustrated in fig. 1. Two options are available for this shape.
    1. Option 1, activated by setting o1 = 1, consists of a third fin.
    2. Option 2, activated by setting o2 = 1, consists of a fourth fin.
  • 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 tube with fins: base configuration

Figure 1. The base configuration for the tube with fins.
  • Fig.1 illustrates the base configuration of the tube with fins, which is composed of a closed circular tube with two fins.
  • The geometric configuration of the tube with fins 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.
Component Dimension Symbol Default Nb.
tube radius Ro required 01
Web radius Ri required 02
Fin1 width wf1 required 03
Fin1 thickness tf1 required 04
Fin2 angle θf1 90° 05
Fin2 width wf2 wf1 06
Fin2 thickness tf2 tf1 07
Table 1. Dimensions defining the geometry of the tube with fins.
  • Zone 1 of the tube with fins is defined as follows.
    • It comprises the following faces: Tube1, Tube2, Tube3, Tube4, Fin1, and Fin2.
    • It is associated with material Mat1 , which can refer to material properties or solid properties.

The tube with fins: option 1

Figure 2. The tube with fins: option 1.
  • When option 1 is active, i.e., when o1 = 1, a third fin is added, as illustrated in fig. 2.
  • The geometric configuration of the third fin is defined by the dimensions listed in table 2, which are also indicated in fig. 2. Dimensions labeled in red are required. Dimensions labeled in blue are optional and are assigned the default value indicated in table 2.
Component Dimension Symbol Default Nb.
Fin3 angle θf3 180° 08
Fin3 width wf3 wf1 09
Fin3 thickness tf3 tf1 10
Table 2. Dimensions defining the third fin
  • Zone 2 consists of the reinforcement of the top flange and is defined as follows.

The tube with fins: option 2

Figure 3. The tube with fins: option 2.
  • When option 2 is active, i.e., when o2 = 1, a fourth fin is added, as illustrated in fig. 3.
  • The geometric configuration of the third fin is defined by the dimensions listed in table 3, which are also indicated in fig. 3. Dimensions labeled in red are required. Dimensions labeled in blue are optional and are assigned the default value indicated in table 3.
Component Dimension Symbol Default Nb.
Fin4 angle θf4 270° 08
Fin4 width wf4 wf1 09
Fin4 thickness tf4 tf1 10
Table 3. Dimensions defining the fourth fin
  • Zone 3 of the the reinforcement of the bottom flange is defined as follows.