Polygonal component (inscribed)

Tools: Downstand Beam, Upstand Beam + Upstand + Strip Foundation + Profile Wall

You can use Polygonal Component (Inscribed) to draw polygonal components based on the radius of an inscribed circle. You enter polygonal components as you would enter curved components. In addition, you define the number of straight sections that make up the component in the Properties dialog box.

Inscribed means that the component is based on the radius of an imaginary, inscribed circle. The sections together count as one partial section. The division is a tangent to the circle that you enter when defining the geometric outline.

Difference between inscribed and circumscribed polygonal components

Schematic overview of curved components and polygonal components

To create an inscribed polygonal component

• A tool for creating linear components is open (for example, Strip Foundation). You have already defined the component’s parameters.

1. Enter the number of corners in the Segments box on the context toolbar.
2. Click the starting point of the polygonal component.
   

   • Click the point.
   • Align to points using the linear snap function and click the point.
   • Define the point by making entries in the dialog line.

   Tip: To find out how to enter points in Allplan, see Precision Drawing.

   Tip: The shortcut menu and dialog line provide tools and options to assist you in the process of entering points. For more information, see Tools and Options.

3. Click the end point of the polygonal component.

   The secant appears.

4. Click in the workspace to define the direction in which the arc is to extend – relative to the component line (secant).

   

   (1) Direction in which the arc is to extend – relative to the secant
   (2) Connecting point = end point of component
   (3) Center point
   (4) Connecting point = starting point of component

   The preview shows the direction of extension and the position of the component axis. In the case of multilayer components (for example, walls), you can see the layer structure with the thicknesses of the layers. The position of the first layer gets the number 1, which is the same color as the component axis.

5. Check the preview to see whether the component’s direction of extension is correct. If it isn’t, click Reverse offset direction on the context toolbar to change the direction.

   You can change the direction of extension at any time, even while entering components.

6. By default, the system proposes the last radius used. If this value is less than ½ a, the system automatically proposes ½ a. As an aid to orientation, the program displays a perpendicular bisector which extends to the base line so that you can define the curve of the arc in terms of a center point (without having to enter numeric values).

   

   (1) Center of circle
   (2) Perpendicular bisector

7. Define the radius in one of the following ways:
   • Confirm the value in the dialog line.
   • Enter a new value in the dialog line.
   • Click in the workspace.
     The system drops an imaginary perpendicular to the perpendicular bisector. The point obtained serves as the center of the circle. You can see the value of the radius in the dialog line.

     

     (1) Proposed center of circle
     (2) New center of circle
     (3) Crosshairs

8. Select the Enter key to confirm the value in the dialog line.

   Allplan draws the polygonal component.