In this case, it is necessary to change the cross-section to TO 120/40/5/5/5/5.
Question
I get an implausible result with the expression "1.#J" in the RF‑/ALUMINUM add-on module.
How can I fix this?
Answer:
This kind of result may occur if the limit internal forces of the cross-section cannot be determined. In most cases, the problem lies in a wrongly defined cross-section or in the selection of an unsupported cross-section. Please check whether you have selected the cross-section allowed for the aluminum structure in the add-on module. These include the rolled cross-sections and parametric thin-walled cross-sections.The cross-section HK 120/40/5/5/5/5 shown in Image 01 is not a valid cross-section, as it has been selected from the area of solid cross-sections (concrete components).
In this case, it is necessary to change the cross-section to TO 120/40/5/5/5/5.
In this case, it is necessary to change the cross-section to TO 120/40/5/5/5/5.
Please note that when performing a design in RF‑/ALUMINUM, you have to select a material that also covers the material thicknesses used for the cross-sections. A material that is only allowed up to t=3 mm cannot be used for a cross-section with t=5 mm.
Do you have any questions?
![KB 001848 | Timber Column Design as per 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.
![Feature 002827 | Stresses Within Members](/en/webimage/050679/3922742/50679.png?mw=512&hash=89c2586ec7139690a213073aaa5a3e314c7ed023)
Get a better understanding of the stress distribution within member cross-sections by using clipping planes.
![Feature 002426 | Animation of Deformation](/en/webimage/032091/3328083/AnimationRFEM6_EN.jpg?mw=512&hash=ecf9e52031e929ead1b99a37bfa7e0b1c3a2f4f2)
The deformation process of the global deformation components can be represented as a movement sequence.
![Feature 002423 | Displaying Results in Solids](/en/webimage/031923/3325382/FE_Solid_EN.jpg?mw=512&hash=d2950a5e2123942fab13aad296e814c67695c955)
The results of solid stresses can be displayed as colored 3D points in the finite elements.
How can I fix this?
Recommended Products for You