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![KB 001829 | Determination of Bilinearization for Pushover Curve (N2 Method)](/en/webimage/040495/3514716/beitrag_en.png?mw=512&hash=3e2f0d632077789d4057f3f5f70913e5dbcdd9e6)
![KB 001833 | Using Nonlinearities in Response Spectrum Analysis in RFEM 6](/en/webimage/040014/3505148/01-en.png?mw=512&hash=65e98cfe859ce35a3e3e9da47a0ef9335401520e)
![Modifying Boundary Lines](/en/webimage/010439/2986115/01_Begrenzungslinien_ändern_en.png?mw=512&hash=10deb357bfb8bf3668412234fddacaeb75926b05)
![RF-MOVE Surfaces - 1.1 General Data](/en/webimage/014835/2948753/01-en.jpg?mw=512&hash=6882bdf317819915c8ed0a390b2a4a91f036117f)
![AISI S100 / CSA S136 Cold-Formed Steel Design in RFEM 6](/en/webimage/040277/3509688/Cold_formed_AISI_EN.png?mw=512&hash=64fe70077d24767102745523ca11a1880ab1ff6e)
The design of cold-formed steel members according to the AISI S100-16 / CSA S136-16 is available in RFEM 6. Design can be accessed by selecting “AISC 360” or “CSA S16” as the standard in the Steel Design Add-on. “AISI S100” or “CSA S136” is then automatically selected for the cold-formed design.
RFEM applies the Direct Strength Method (DSM) to calculate the elastic buckling load of the member. The Direct Strength Method offers two types of solutions, numerical (Finite Strip Method) and analytical (Specification). The FSM signature curve and buckling shapes can be viewed under Sections.
![Effective Cross-Section in SHAPE-THIN 8](/en/webimage/006822/484232/DUENQ.png?mw=512&hash=96d43be20a4528cf741503961d2b0429d7f70ef4)
In SHAPE-THIN 8, the effective cross-section of stiffened buckling panels can be calculated according to EN 1993-1-5, Cl. 4.5.
The critical buckling stress is calculated according to EN 1993-1-5, Annex A.1 for buckling panels with at least 3 longitudinal stiffeners, or according to EN 1993-1-5, Annex A.2 for buckling panels with one or two stiffeners in the compression zone. The design for torsional buckling safety is also performed.
![Feature 002842 | Sign-Dependent Stress Analysis](/en/webimage/051240/3953337/1.png?mw=512&hash=9d7f6c198b6d4ae6ee8f2fa8bca75f85579e14c9)
In the Stress-Strain Analysis add-on, you can use the option to specify sign-dependent limit stresses by stress component.
![Feature 002830 | Timber Materials According to American Standard ANSI/AWC NDS‑2024](/en/webimage/050941/3955385/2024-06-28_9-24-31.png?mw=512&hash=5c5e7570b000cecb312e3f2c977caa97d8cd3604)
The material library of RFEM and RSTAB includes the timber materials according to the American standard ANSI/AWC NDS‑2024.