Stirrup

Stirrups are used to resist shear and torsional forces in concrete members.

Dialog Box "New Stirrup"

The stirrup number is assigned automatically, but can be changed. The order is not relevant for numbering. It also does not have to be consecutive; gaps in the numbering are permitted.

Cover points No.

You can position stirrups at cover points. Cover points are points of the 'On Line' type on the cover line. You can also create additional cover points on the cover line and use them for the stirrup arrangement.

For the 'Standard' stirrup type, both open and closed stirrups can be defined. A closed stirrup is created when the start cover point is identical to the end cover point. To do this, enter the start cover point again at the end of the point sequence. For example, specifying the cover points 504–501,504 creates a closed stirrup, since the start cover point 504 is also the end cover point 504.

Stirrup type

Different stirrup types are available in the list.

Stirrup Types

Standard

The 'Standard' stirrup type allows the definition of any stirrup shapes, including rectangular, circular, and triangular stirrups as well as stirrups with straight and curved segments.

To create a stirrup, enter the desired cover points. The resulting stirrup segments are listed in the 'Segments' tab and can be edited there.

Standard Stirrup Type, Segments

For each segment, you can adjust the associated cover points, change the segment type, and for 'Arc' type segments also edit the control point coordinates.

In addition, segments can be split, merged, or deleted. Use the buttons below the list for this purpose.

	Splits selected straight stirrup segments
	Merges selected straight stirrup segments
	Deletes the selected segments

Circle

The 'Circle' stirrup type is used for the quick and easy definition of circular stirrups.

Stirrup Type 'Circle'

Various options are available for defining a circular stirrup. You can define the circular stirrup directly via the center of the circle and the radius. Alternatively, you can specify one or two cover points and the center of the circle; in this case, the radius is calculated. You can also specify three cover points. The center of the circle and the radius are then determined from the cover points.

Material

In the list of materials already created, you can select a material for the stirrup or edit and redefine it. Only materials of the 'Reinforcing steel' type are permitted.

Parameters

The available parameters depend on the selected stirrup type. For the 'Standard' stirrup type, the stirrup diameter d_s,st, bend diameter d_br,st, and bend roller diameter factor k are interdependent. The relationship is described by the following equation:

d_br,st = k · d_s,st

Information | Analytical

This section provides an overview of important properties such as reinforcement area, length, and weight of the stirrup.