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Frequently Asked Questions (FAQ)
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AnswerSince the equivalent member designs of Eurocode 3 have different interactions than are the case for the designs according to the partial internal prescalcision method and a mixture of these different designs is not desired for reasons of clarity, RFEM deactivates the equivalent member designs when using the RF- / STEEL Plasticity add-on.
AnswerThe critical load factor specifies the factor by which you can increase a load until the system fails. If it is smaller than one, a calculation according to the second-order analysis is usually used unstable because the system is already loaded above the critical load. This factor is also taken into account in standardization. For example, Eurocode 3 specifies that a calculation according to the second-order analysis is no longer necessary from a critical load factor of 10.The critical load factor can be determined with the RSBUCK module or RF-STABILITY.
AnswerPlease check if all sets of members selected for the design are sets of members. The equivalent member method is only applicable for straight sets of members with a uniform cross-section involving, for example, no taper. In this case, use the preset General Method.
AnswerThe reason is that there is no stability analysis for unsymmetrical, open cross-sections according to EN 1999-1-1 when the compressive normal forces and the bending moments are effective.You can neglect the bending moments in Details in the Stability tab by selecting a filter. Then, the flexural buckling design is performed without moments. However, this is under your own responsibility. An alternative is to use a stability check according to the second-order analysis, which would be possible by means of the RF-/FE-LTB add-on module.
AnswerModifications are not considered in the add-on module and have to be adjusted manually.
AnswerIn the load generators, you can exclude individual members from the area load generation by means of the 'Without Effect On' function and thus specify a tension direction.
AnswerThe RF STEEL Surfaces add-on module is responsible for performing an elastic stress analysis for surfaces. A fire resistance design is not implemented, but can be carried out by manual adjustment of the stiffness in RFEM and by adjustment of the yield strength in the add-on module.
This is because no results have been selected. If at least one check box is activated which leads to results, the members are also displayed.
If you need to define different types of lateral intermediate supports, you need to divide the specific member. After that, you can create a set of member and with that done, you can easily define different types of intermediate supports along this set of member, or you can use different nodal supports in the nodes of the set of member.
AnswerIn the module's results tables, you can find all intermediate values depending on the wind direction and the side as well as the section. This function is also available in the long version of the report, but can significantly increase the size of the report.
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