19 September 2019

FAQ 003317 EN

# I get an implausible result with the expression "1.#J" in the RF‑/ALUMINUM add-on module.How can I fix it?

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 if 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 Figure 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 the case of the design in RF‑/ALUMINUM, please note that you have to select the material which also involves 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.