Radial reinforcement - bars

This option is used to define a distribution of reinforcing bars for 2D contours (e.g. an RC slab) in the shape of a circle or circle sector. There are several ways to access this option:

• Menu: Reinforcement > Radial reinforcement - bars
• Ribbon: ASD - Reinforcement > Reinforcement - definition > Radial reinforcement - bars
• Toolbar: Definition - bars > Radial reinforcement - bars
• Command line: RBCR_CREATE_RADIAL.

The following dialog displays:

The distribution defines two types of bars:

• Radial distribution - bars distributed perpendicularly to the circle along radiuses, with the assigned distribution angle (bars are spaced regularly along the circle circumference or circle sector)
• Polar distribution - bars of the circumferential reinforcement distributed uniformly with the assigned spacing, perpendicularly to the radius.

The dialog is divided into three main parts:

The left side of the dialog contains icons defining a distribution type / contour type:

1. SELECTION OF A CONTOUR TYPE

   - a contour of surface distribution of bars (this may only be a contour in the shape of a circle, circle sector, ring or ring sector) - radial or polar distribution

   - a contour of surface distribution of bars above an intermediate support (with respect to the support axis) - radial and polar distribution (Note: such a distribution may be defined only above an arc or circle)

   - a contour of surface distribution of bars above the outermost support (along the support edge) - radial and polar distribution (Note: such a distribution may be defined only above an arc or circle)

2. SELECTION OF A DISTRIBUTION TYPE

   - a surface distribution of bars within a defined contour (this may only be a contour in the shape of a circle, circle sector, ring or ring sector) - radial distribution

   - a surface distribution of bars within a defined contour (this may only be a contour in the shape of a circle, circle sector, ring or ring sector) - polar distribution

The central part of the dialog box includes parameters which are indispensable while defining a selected type of the reinforcement distribution:

1. Radial distribution (within a contour)

   The upper part of the dialog contains options for defining a distribution region or opening(s): additionally, there are edit fields which enable defining values of support widths and a reinforcement cover.

   When defining a reinforcement distribution contour, the Opening option is inaccessible, whereas the Distribution region option is active and selected. Once definition of a contour is completed, the Distribution region option is no longer active, whereas the Opening option is active and selected. You can then define an opening contour; a number of openings can be defined.

   Once the beginning point of a distribution is indicated, reinforcing bars are distributed perpendicularly to the arc of the radius length reduced by twice the value of the cover (at the beginning and end of the bar). If a bar length does not exceed the allowable maximum bar length, then single bars are drawn. If it is longer, bars are automatically divided into segments with lap splices.

2. Radial distribution (with respect to the support axis)

   The following options are provided in the central part of the dialog (reinforcing bars are distributed perpendicularly to the arc):

   • The edit field for defining a support width.
   • Edit fields for defining values of the reinforcement overhang outside the support face (in both directions).
3. Radial distribution (above the outermost support)

   The following options are provided in the central part of the dialog (reinforcing bars are distributed perpendicularly to the arc):

   • The edit field for defining a value of the reinforcement cover
   • The edit field for defining a support width
   • The edit field for defining a value of the reinforcement overhang outside the support face.
4. Polar distribution (within a contour)

   Circle-shaped bars are distributed parallel to the circle or arc, with the defined spacing. There may be more than one zone in a distribution of circle-shaped bars. If a length of ring bars exceeds the allowable maximum bar length, then they are divided into segments considering the lap splice. Division into segments is performed according to the following rule:

   1. The length of a number of bars does not exceed the maximum allowable bar length (considering the lap splice)
   2. Lengths of all bars are identical.

   Ring bars are distributed perpendicular to the radius of a distribution region.

5. Polar distribution (above the support)

   Reinforcing bars are distributed parallel to the circle or arc (above the support).

   The right side of the dialog includes icons for selecting a mode of graphical distribution definition. The number of icons depends on a selected type of the surface distribution.

6. Radial and polar distributions (within a contour)

   Select - is used to select a contour defined as a circle, circle sector, ring or ring sector.

   Pick point - is used to indicate an internal point of a closed contour; the operation results in detecting a contour.

   Region - is used to define a ring of two radiuses: inner and outer - for this mode it is possible to define supports of different widths on the contour edges.

   Delete opening - is used to delete an earlier-defined opening contour; available while modifying reinforcement in a defined region with an opening or while defining a greater number of openings.

7. Radial distribution (with respect to the support axis and above the outermost support) and polar distribution (above the support)

   Select - is used to select one edge of a contour defined as a line or support.

   Start - Center - End - is used to indicate three characteristic points of an arc: arc beginning, arc end and center of a circle to which the arc belongs.

   3 Points - is used to indicate three points which lie on the arc.

Click OK, to open the Reinforcement: definition and detailing - radial reinforcement dialog.