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Frequently Asked Questions (FAQ)
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AnswerWhen creating a load combination, the calculation type "II. Order "default. For linear systems, however, which are statically indeterminate, the results for load cases, which are calculated by theory according to the first order, can therefore differ.
AnswerFor a vault-free cross-section, a proof of the complete system is recommended using theory II. Order - internal forces and local imperfections. The entry of the effective lengths and nodal bearings (with staff sets) can thus be omitted. However, please activate gamma_M1 for cross-section verification.
No, when using a nonlinear material model, it is not absolutely necessary to determine according to Theorie II. Or III. To calculate order. The material nonlinearity is also considered in the calculation according to the linear static analysis.
The calculation according to Theorie II. Or III. Order means that the equilibrium is set on the deformed system. Thus, it is a geometric nonlinearity.
Difference between II. And III. Order is that at III. Also large rotations may occur.
Thus, if there is no stability problem or the stability problem is analyzed in another way, the calculation according to the linear deformation analysis is sufficient.
That's right, both add-on modules count on the 7th. Degree of freedom, warping.
The difference is that in RF- / FE-LTB, only the loads acting directly on the set of members are automatically detected. Loads from other structural components that are indirectly effective on the set of the RFEM implementations must be added manually as Extra Loads. In RF- / FE-LTB, a complete recalculation of the structure takes place.
RF- / STEEL Warping Torsion on the other hand analyzes the internal force diagrams from the calculation of the main program and then calculates the loads back. They will be newly applied and calculated. Thus, the input of the loading is omitted, which means a time saving.
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