In the Stress-Strain Analysis add-on, you can use the option to specify sign-dependent limit stresses by stress component.
Sign-Dependent Stress Analysis
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![KB 001848 | Timber Column Design as per the 2018 NDS Standard in RFEM 6](/en/webimage/040983/3525158/Timber_Column_for_KB_1848.png?mw=512&hash=8767c3300658d77c253bb7ff632327937a04dd95)
Using the Timber Design add-on, timber column design is possible according to the 2018 NDS standard ASD method. Accurately calculating timber member compressive capacity and adjustment factors is important for safety considerations and design. The following article will verify the maximum critical buckling strength calculated by the Timber Design add-on using step-by-step analytical equations as per the NDS 2018 standard including the compressive adjustment factors, adjusted compressive design value, and final design ratio.
![Add-on "Stress-Strain Analysis"](/en/webimage/032560/3346069/1_EN_NEW.png?mw=512&hash=a575d6bdf75cc9392f8d3424a554e6f805a60464)
This article shows how to manage the input data for member and surface design configurations within the Stress-Strain Analysis add-on.
![Selecting Thin-Walled Analysis Method in Base Data](/en/webimage/031673/3320002/EN_1_NEW.png?mw=512&hash=20139c15c22ed3af80d7bc27d2ec9cdac8a19340)
The stand-alone program RSECTION is at your disposal for determining section properties and performing stress analysis for thin-walled and massive cross-sections. The program can be connected to both RFEM and RSTAB so that sections from RSECTION are also available in the RFEM and RSTAB library. Likewise, internal forces from RFEM and RSTAB can be imported into RSECTION.
![Analysis Methods Available in RSECTION 1](/en/webimage/031603/3319998/1_EN_new.png?mw=512&hash=1e89d90864b628dc8b2ff7f18b98136de90327f3)
You can use the stand-alone program RSECTION to determine the section properties for any thin-walled and massive cross-sections, as well as to perform a stress analysis. The previous Knowledge Base article titled "Graphical/Tabular Creation of User-defined Cross-sections in RSECTION 1" discussed the basis of defining cross-sections in the program. This article, on the other hand, is a summary of how to determine the section properties and perform a stress analysis.
![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.
![Output of Stresses, Graphically and Tabularly](/en/webimage/022955/3130494/Ausgabe_der_Spannungen,_grafisch_und_tabellarisch_ENG.png?mw=512&hash=d2715b10547f913d3a3bfbdf03b5376362cc421a)
Compared to the RF‑/STEEL add-on module (RFEM 5 / RSTAB 8), the following new features have been added to the Stress-Strain Analysis add-on for RFEM 6 / RSTAB 9:
- Treatment of members, surfaces, solids, welds (line welded joints between two and three surfaces with subsequent stress design)
- Output of stresses, stress ratios, stress ranges, and strains
- Limit stress depending on the assigned material or a user-defined input
- Individual specification of the results to be calculated through freely assignable setting types
- Non-modal result details with prepared formula display and additional result display on the cross-section level of members
- Output of the design check formulas used
![Stress-Strain Analysis for RFEM 6](/en/webimage/043484/3584990/Screenshot_09-04-2023_11.09.44.png?mw=512&hash=d55a481753a454319308a25936b0b811c243097d)
- General stress analysis
- Automatic import of internal forces from RFEM/RSTAB
- Graphical and numerical output of stresses, strains, clearance, and design ratios fully integrated in RFEM/RSTAB
- User-defined specification of the limit stress
- Summary of similar structural components for the design
- Wide range of customization options for graphical output
- Clearly arranged result tables for a quick overview after the design
- Simple traceability of the results due to the complete documentation of the calculation method including all formulas
- High productivity due to the minimal amount of input data required
- Flexibility due to detailed setting options for basis and extent of calculations
- Gray zone display for unimportant value ranges ( Go to Product Feature )
![Surface Stresses](/en/webimage/047223/3686644/Flächenspannungen.png?mw=512&hash=531d394190722f5a361683f5ba935f7f7495eb25)
- Cross-section optimization
- Transfer of optimized sections to RFEM/RSTAB
- Design of any thin-walled section from RSECTION
- Representation of a stress diagram on a section
- Determination of normal, shear, and equivalent stresses
- Output of stress components for the individual member internal force types
- Detailed representation of stresses in all stress points
- Determination of the largest Δσ for each stress point (for example, for fatigue design)
- Colored display of stresses and design ratios for a quick overview of the critical or oversized zones
- Output of parts lists
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