L-section

@SHAPE_BUILDER_ANALYSIS {
@SHAPE_BUILDER_NAME {LsecName} {
@SHAPE_GROUP {WALLED_OPEN}
@SHAPE_TYPE {L_SECTION}
@OPTION_DEFINITION {o1, o2}
@DIMENSIONS {
@DIMENSION_01 {hw}
@DIMENSION_02 {tw}
@DIMENSION_03 {wbf}
@DIMENSION_04 {tbf}
@DIMENSION_05 {αbf}
@DIMENSION_06 {twr}
@DIMENSION_07 {tbfr}
@DIMENSION_08 {α}
@DIMENSION_09 {β}
}
@MATERIALS {
@MATERIAL_01 {Mat1}
@MATERIAL_02 {Mat2}
@MATERIAL_03 {Mat3}
}
@IS_DEFINED_IN_FRAME {FrameName}
@MESH_DENSITY {md}
@COMMENTS {CommentText}
}
}

Notes

  • ShapeBuilder can generate beam cross-sections in the shape of a “L.” To define an L-section, use the following parameters.
    1. @SHAPE_GROUP: WALLED_OPEN, and
    2. @SHAPE_TYPE: L_SECTION.
  • The base section is an open section consisting of a bottom flange connected by a web, as illustrated in fig. 1. Two options are available for this shape.
    1. Option 1, activated by setting o1 = 1, consists of a reinforcement located on the side of the web.
    2. Option 2, activated by setting o2 = 1, consists of a reinforcement located at the bottom of the bottom flange.
  • Optional dimensions @DIMENSION_08 and @DIMENSION_09 define two shaping parameters, denoted α and β, respectively, which are used to round the corners of the section.
  • 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 L-section: base configuration

  • Fig.1 illustrates the base configuration of the L-section, which is composed of the web and bottom flange.
  • The geometric configuration of the L-section if defined by the dimensions listed in table 1, which are also indicated in figs. 1, 2, and 3. 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.
L-section height hw required 01
Web thickness tw required 02
Flange width wbf hw 03
Flange thickness tbf tw 04
Flange skew angle αbf 05
Table 1. Dimensions defining the geometry of the L-section.
Figure 1. The L-section: base configuration.             Figure 2. The L-section: options 1 and 2.
  • Zone 1 of the L-section is defined as follows.

The L-section: option 1

  • When option 1 is active, i.e., when o1 = 1, the web is reinforced, as illustrated in fig. 2.
  • The geometric configuration of the reinforcement if 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.
Web thickness twr tw 06
Table 2. Dimensions defining the reinforcement of the web.
  • Zone 2 consists of the reinforcement of the web and is defined as follows.

The L-section: option 2

  • When option 2 is active, i.e., when o2 = 1, the bottom flange is reinforced, as illustrated in fig. 2.
  • The geometric configuration of the reinforcement if 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.
Flange thickness tbfr tbf 07
Table 3. Dimensions defining the reinforcement of the bottom flange.
  • Zone 3 consists of the reinforcement of the bottom flange and is defined as follows.