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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 add-on module RF- / EL-PL is only designed for the elastic-plastic dimensioning concept of steel cross-sections. As a result, only materials from the category "Steel" can be calculated in the module.
Cross-sections of the type "General" might cause this long-lasting analysis in STEEL EC3 and Aluminium.
You find them in Table 1.3 Cross-Sections. For these cross-sections, it is necessary to calculate the stresses for the cross-section classification with SHAPE-THIN in the background. The result combination (RC) for the design may contain many load combinations (CO). This could lead to the fact that the SHAPE-THIN analysis will be performed very often and might take a very long time. However, there is a workaround. With the option displayed in the second figure, the enveloping internal forces of the RC are used, and each CO included in the RC cannot be calculated. This may be more conservative, however, it is faster because not every CO requires a SHAPE-THIN analysis, only the envelope.
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