This video shows how to assign effective lengths. To perform a stability analysis in Steel Design, it is necessary to determine the definition of effective lengths. After assigning the effective length to an object, the settings are taken into account in the stability design.
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![KB 001824 | Distortional Buckling Design of Bottom Flange of Steel Frame Beam According to GB](/en/webimage/039757/3498651/Image_05_1200x900_EN.jpg?mw=512&hash=f4dfecd996373a0b9349f601c5a7d6220336caf8)
When a concrete slab is set upon the top flange, its effect is like a lateral support (composite construction), preventing problems of torsional buckling stability. If there is a negative distribution of the bending moment, the bottom flange is subjected to compression and the top flange is under tension. If the lateral support given by the stiffness of the web is insufficient, the angle between the bottom flange and the web intersection line is variable in this case so that there is a possibility of distortional buckling for the bottom flange.
![KB 001840 | Fire Resistance Design of Steel Components with Hot-Dip Galvanizing in RFEM 6 / RSTAB 9](/en/webimage/040242/3508895/fire_resistance_configuration_galvanized_surface.png?mw=512&hash=890480b0d5bbf5138ef4732c471fd06ffce4f034)
With the Steel Design add-on, you can design structural steel components in the event of fire using the simple design methods according to Eurocode 3. The component temperature at the time of the design check can be determined automatically according to the temperature-time curves specified in the standard. In addition to considering a cladding for fire protection, it is also possible for you to take account of the beneficial properties of hot-dip galvanization.
![KB 001782 | SJI Virtual Joists](/en/webimage/036638/3434204/image1.png?mw=512&hash=160c93fe370c3820a1a2d84a2abc84c861bcfba5)
The Steel Joist Institute (SJI) previously developed Virtual Joist tables to estimate the section properties for Open Web Steel Joists. These Virtual Joist sections are characterized as equivalent wide-flange beams which closely approximate the joist chord area, effective moment of inertia, and weight. Virtual Joists are also available in the RFEM and RSTAB cross-section database.
![KB 001759 | Consideration of Second-Order Effects in RFEM 6 and RSTAB 9](/en/webimage/034042/3377316/2022-09-08_14-32-04.png?mw=512&hash=f234df60c72ad9e85c0f1a2210bf9dc0cede3bda)
Consideration of p-δ Second-Order Effects in RFEM 6 and RSTAB 9
![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 the Dlubal Center with a large number of program-side template connections, including 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 002820 | Limit Plastic Strain for Welds](/en/webimage/050344/3881226/1.png?mw=512&hash=9d7f6c198b6d4ae6ee8f2fa8bca75f85579e14c9)
In the ultimate configuration of the steel joint design, you have the option to modify the limit plastic strain for welds.
![Component "Base Plate"](/en/webimage/050345/3936120/50345.png?mw=512&hash=3bd641cb1a2445804b338855e4debfc40c6563e9)
The "Base Plate" component allows you to design base plate connections with cast-in anchors. In this case, plates, welds, anchorages, and steel-concrete interaction are analyzed.
![Feature 002807 | 3D Display of FSM Results](/en/webimage/049281/3861162/2024-05-01_10-32-55.png?mw=512&hash=2377d291bc20ac3d78d617b50c131614e99ac6f7)
In the "Edit Section" dialog box, you can display the buckling shapes of the Finite Strip Method (FSM) as a 3D graphic.
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