In the Steel Joint add-on, you can arrange objects with a relative reference to other objects.
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![Steel Connection Rigidity and Its Influence on Structural Design](/en/webimage/051432/3972404/Rigidity-caseA.png?mw=512&hash=3be64e68ab2956fd2b92f0afa1559b3a8c72b468)
Understanding steel connection rigidity is crucial in structural design. Often, connections are treated as strictly pinned or rigid, but this can lead to uneconomical or even dangerous designs. Explore how Dlubal Software's RFEM and Steel Joints add-on help verify connection stiffness and moment resistance, ensuring safer and more economical designs.
![KB 001853 | Initial Stiffness Analysis in Steel Joints](/en/webimage/042196/3554460/01-en.png?mw=512&hash=65e98cfe859ce35a3e3e9da47a0ef9335401520e)
This article explains how the calculation in the initial stiffness analysis in Steel Joints works.
![Supporting Structure](/en/webimage/040038/3505659/1_Tragkonstruktion.jpg?mw=512&hash=b2147bfe692511de7b1da8159becc11136d10522)
In this article, a lap joint of a ZL purlin on a monopitch roof is modeled and designed using the Steel Joints add-on, and compared with the load-bearing capacity table of the manufacturer.
![Running Steel Joint Design](/en/webimage/030019/3272843/7_calculaiton.png?mw=512&hash=d4da9e78f2ced1add1ae39c3756578cd5568ddcd)
The advantage of the RFEM 6 Steel Joints add-on is that you can analyze steel connections using an FE model for which the modeling runs fully automatically in the background. The input of the steel joint components that control the modeling can be done by defining the components manually, or by using the available templates in the library. The latter method is included in a previous Knowledge Base article titled “Defining Steel Joint Components Using the Library". The definition of parameters for the design of steel joints is the topic of the Knowledge Base article “Designing Steel Joints in RFEM 6".
![Feature 002851 | Relative placement of objects](/en/webimage/051664/3996295/2.png?mw=512&hash=495637ed9f78ff76e0ac09e73585e9001cb15ebb)
In the Steel Joint add-on, you can arrange objects with a relative reference to other objects.
![Add-on "Steel Joints for RFEM 6" | Component Library](/en/webimage/043097/3898884/steel_joints_components.png?mw=512&hash=e4f835906155863fc7019d5043b22e553dc766f9)
- Numerous component types, such as base and end plates, web angles, fin plates, gusset plates, stiffeners, tapers, or ribs for easy input of typical connection situations
- Universally applicable basic components (such as plates, welds, bolts, auxiliary planes) for modeling complex connection situations
- Graphical display of the connection geometry with dynamic updating during the input
- Wide range of cross-section shapes: I-sections, U-sections, angles, T-sections, hollow sections, built-up cross-sections and thin-walled sections
- Library in Dlubal Center with program template connections as well as user-defined templates
- Automatic adaptation of the connection geometry based on the relative arrangement of the components to each other – even in case of subsequent editing of the structural components
![Feature 002841 | Component "Stub"](/en/webimage/051229/3952563/Stummel.png?mw=512&hash=2b87f781933bb351e063b4ad912f355ec4c57a02)
The "Stub" component is available to you in the Steel Joints add-on. It allows you to extend a member using a purlin joint with another member (stub) and to connect it to a reference component.
![Feature 002831 | Rib Pattern](/en/webimage/050989/3931834/1.png?mw=512&hash=9d7f6c198b6d4ae6ee8f2fa8bca75f85579e14c9)
In the Steel Joint add-on, you can define several ribs at the same time on one member or plate. The distribution can be carried out according to an orthogonal and a polar pattern.
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