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Frequently Asked Questions (FAQ)
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AnswerBy default, the compute core of the cross-section program SHAPE-THIN is used in the RF- / ALUMINUM add-on module to determine the stresses of the effective cross-section in an iterative procedure. This method is precise because all vertices and edges of the cross-section are considered, but can be very time-consuming for complex sections.Alternatively, it is possible to determine the effective cross-section by means of a simplified analytical method (see Figure 01) that runs much faster. In this approach, corners, fillets, etc. are neglected and subsequently compensated by a factor. No iterative calculation is performed. Therefore, the effective cross-section values may be higher than with the SHAPE-THIN calculation.In such a case, it is recommended to carry out the calculation with the analytical method and then to design only the governing structural component with the governing load combination with the SHAPE-THIN solution.
AnswerThe limits can not be modified in ALUMINUM. However, you can create a new material with modified boundaries based on the required material. Figure 1 shows the mask of the material library. Select a suitable base material here and then click on "Create new material ...". In the following dialog you can give the material a new name and change all parameters of the material.
AnswerUnfortunately not. Intermediate supports and nodal supports have to be set manually. The default configuration for effective lengths is 1,0*member length and for set of members, one nodal support with definition u_y' and phi_x' is defined on each side of the set of member.To speed up the process of defining nodal supports, you can pick more nodes in one step by using the highlighted function in the attached picture.
AnswerIn the basic information, the rod sets must first be selected so that they can be dimensioned for the corresponding limit states. Thereafter, various requirements for the proof of serviceability can be made in the usability parameters.
AnswerIn the printout report selection, you will find filter options, for example, to display only the maximum amount of evidence in the table. These filters reduce the size considerably. The filter options are also available directly in the module.
AnswerThe DUENQ cross-section consists of several non-contiguous partial cross-sections, so that in DUENQ it is calculated according to the theory of stiffening systems. DUENQ also gives a hint before the calculation. The dimensioning of such cross sections is not possible in add-on modules such as RF / STEEL EC3, RF / ALUMINUM etc.In most cases, however, the cross-sectional parts should be connected to each other. The FAQ describes how this connection can be modeled.
AnswerAll effective length factors are preset to 1.0 by default. There is no calculation of the factors based on the model.
One or more stress points of the cross-section have a thickness that is not covered by the material properties. Therefore, the add-on modules cannot go back to the yield strength for the design and display the warning.
Please select another material that covers the thickness range, or change the thickness range of the existing material.
The "Mode Shape - Overview" window allows you to check the plausibility of the eigenvalue analysis. You can open this window by clicking the button marked in the figure.
The graphical control of the mode shape graphic is available if the eigenvalue solver was used in the calculation, for example, in the case of the analysis according to General Method in compliance with EN 1993‑1‑1.
The individual designs, for example, bending and compression according to Sec. 6.3.3 EN 1993‑1‑1 cannot be deactivated. For a successful analysis, all required designs are to be fulfilled.
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