- Full integration in the RF-/STEEL EC3 add‑on module
- Design of cross-sections for tension, compression, bending, torsion, shear, and combined internal forces
- Plastic design of members according to the second‑order analysis with 7 degrees of freedom, including warping torsion (requires module extension RF‑/STEEL Warping Torsion).
RF-/STEEL Plasticity | Features
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When designing a steel cross-section according to Eurocode 3, it is important to assign the cross-section to one of the four cross-section classes. Classes 1 and 2 allow for a plastic design; classes 3 and 4 are only for elastic design. In addition to the resistance of the cross-section, the structural component's sufficient stability has to be analyzed.
The three types of moment frames (Ordinary, Intermediate, Special) are available in the Steel Design add-on of RFEM 6. The seismic design result according to AISC 341-22 is categorized into two sections: member requirements and connection requirements.
The Steel Design add-on in RFEM 6 now offers the ability to perform seismic design according to AISC 341-16 and AISC 341-22. Five types of seismic force-resisting systems (SFRS) are currently available.
The three types of moment frames (Ordinary, Intermediate, Special) are available in the Steel Design add-on of RFEM 6. The seismic design result according to AISC 341-16 is categorized into two sections: member requirements and connection requirements.
The cross-section resistance design considers all internal force combinations.
If cross-sections are designed according to the PIF method, the internal forces of the cross-section, which are acting in the system of the principal axes related to the centroid or the shear center, are transformed into a local system of coordinates that rests in the web center and is oriented in the web direction.
The individual internal forces are distributed on the top and bottom flanges as well as on the web, and the limit internal forces of the cross‑section parts are determined. Provided that the shear stresses and the flange moments can be absorbed, the axial load-bearing capacity and the ultimate load capacity for bending of the cross‑section are determined by means of the remaining internal forces and compared to the existing force and moment. If the shear stress or the flange resistance is exceeded, the design cannot be performed.
The Simplex Method determines the plastic enlargement factor with the given internal force combination using the SHAPE‑THIN calculation. The reciprocal value of the enlargement factor represents the design ratio of the cross‑section.
Elliptical cross-sections are analyzed for their plastic load‑bearing capacity on the basis of an analytical nonlinear optimization procedure. This method is similar to the Simplex Method. Separate design cases enable flexible analysis of selected members, sets of members, and actions, as well as of individual cross‑sections.
You can adjust design-relevant parameters such as the calculation of all cross‑sections according to the Simplex Method.
The results of the plastic design are displayed in RF‑/STEEL EC3 as usual. The respective result tables include internal forces, cross‑section classes, overall design, and other result data.
The RF-/STEEL Plasticity module extension is fully integrated in RF‑/STEEL EC3. You can enter the data in the same way as in the case of usual design in RF‑/STEEL EC3. However, it is necessary to activate the plastic design of cross-sections in detail settings (see the figure).
- Full integration in the RF-/STEEL EC3 add‑on module
- Design of cross-sections for tension, compression, bending, torsion, shear, and combined internal forces
- Plastic design of members according to the second‑order analysis with 7 degrees of freedom, including warping torsion (requires module extension RF‑/STEEL Warping Torsion).
In the "Edit Section" dialog box, you can display the buckling shapes of the Finite Strip Method (FSM) as a 3D graphic.
Why are the equivalent member design checks grayed out in the Stability tab when activating the plastic design using the partial internal force method (RF‑/STEEL Plasticity)?
How do I define a plastic hinge in RFEM 6?
How can I exchange data between RFEM 6 / RSTAB 9 and IDEA StatiCa?
How can I generate an area load on members via cells in RFEM 6 or RSTAB 9?
In the Steel Design add-on, I have set the boundary conditions in such a way that the I-beam flange is restrained against the horizontal displacement. I then calculated the critical load factors using the Structure Stability add-on, but with no effect on the critical load factor value. What is the reason for this?
Can I estimate which minimum cross-sections I should use before starting to design my model?
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