PEB Knee

Last updated November 20, 2017 by Developer TIN

Software version: 
United States (Imperial)
United States (Metric)

PEB Knee

The PEB Knee plugincomponent that is developed using Tekla Open API

Plugin is a .dll file and loaded inside Tekla Structures process.

Plugins can be started from the applications and components catalog.

allows you to create the desired knee at the column and rafter (beam) junction.

How to locate

Installers are available at Pre-Engineered Building Tools for Tekla Structures version 21.0 and above.
For older version,s download at Pre-Engineered Building Tools old installers

After installation, the PEB Knee plugin is available in the component catalogcatalog that contains all system components and custom components, and the macros and applications



Click PEB Knee in the component cataloguser interface for displaying or modifying information in categorized lists

For example, profile catalog and shape catalog are catalogs.

. Select a column component and a rafter component as input. The columns and beams should be PEB Member.

PEB Knee dialog box

The dialog box has the following tabs:

  • Parameters
  • Parts
  • Bolts
  • Stiffeners
  • Add Stiffeners



Knee types

  The plugin can create the following knee types:
  • Horizontal
  • Vertical
  • Parallel to rafter
  • Parallel to column


The following parts are created:

  1. End Platecomponent object that represents a plate welded perpendicular to the end of the component secondary part

  2. Cover Plate(1) part that represents a flat structure

    (1) In some contexts, for example in analysis, the term plate object may be used to refer to plates.

    (2) plate that represents a steel structure

    (2) Plate is mainly used as a connection piece or as a floor plate.

  3. Knee Plate
  4. Web Stiffenercomponent object that represents a structure that strengthens a steel beam or column

    Stiffeners are usually plates.

    Stiffeners are used to prevent web buckling at supports or concentrated loads.

  5. Outer flange Stiffener
  6. Inner flange Stiffener
  7. Knee Stiffener
  8. Diagonal Stiffener
  9. Eaves Stiffener

The parts are numbered in black in the dialog box image.


There are two plate length types: one is by total length and the other is projection.
The distances are numbered in red in the dialog box.

  1. Projection of rafter from the cover plate
  2. Cover plate top from the rafter flange
  3. Projection of the end plate from the web of the column
  4. Total length of the plate
  5. Projection of the end plate from the web of the column

Note: When Total Length is selected, distance box 3 is not available. When Projection is selected, distance box 4 is not available.



  The parts are shown in the image on the left:
  1. End Plate
  2. Cover Plate
  3. Knee Plate

End plate

You can define end plate properties such as width and thickness.

Cover plate

  There are two ways to define the cover plate width: one automatically calculates the width from the column/rafter flange width and the other is width defined by the user.


  There are two ways to define the cover plate thickness: one automatically calculates the thickness from the column/rafter flange thickness, and the other is thickness  defined by the user.

Knee plate

Knee plate creation is controlled with a Yes or No option.
You can define properties such as thickness for the knee plate.

Note: When the Knee plate option is set to Yes, a knee plate is created and shown only after the rafter member is updated.


  User field 8 is for additional information about bolts. The value is shown in the bolt UDAobject property created by the user in order to widen the range of predefined object properties

User-defined attributes are used when the predefined object properties are not sufficient but more properties are needed. For example, comment, locked, and erection status are user-defined attributes.

of Bolt User Field 8.



See PEB Base plate help

Additional stiffeners


Knee stiffener

 Select Yes in (7) Knee stiffener to create a knee stiffener.

Knee stiffener type

  Knee stiffener types:
  1. Perpendicular to the flanges of the rafter
  2. Perpendicular to the end plate
  3. Parallel to the column flange


  There are two options for thickness: one to calculate the thickness from the column flange automatically, and the other is width defined by the user.


  Stiffener length:
  1. Total length of the stiffener to the rafter depth
  2. Length with clearance from the top flange
  3. Length defined from the end plate


  Stiffener width:
  1. Calculated from the flange
  2. Calculated from the end plate
  3. User-defined

Diagonal stiffener

 Diagonal stiffener controlled by a Yes or No option.

  Location of diagonal stiffener:
  • First option is based on the offset from the diagonal points.
  • Second option is based on the minimum clearance from the nearest faces of flanges / end plate / cover plate / knee stiffener.

Eaves stiffener

 Eaves stiffener creation controlled by a Yes or No option.

Additional stiffeners can be detailed in the 4 web stiffener section.

Additional information

  • Update the column and the rafter (PEB Members) after applying or modifying the connection.

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