In addition to our technical support (e.g. via chat), you’ll find resources on our website that may help you with your design using Dlubal Software.
Frequently Asked Questions (FAQ)
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AnswerFor the design of steel surfaces please use the module of the same name RF-STEEL Surfaces. If you also want to consider local denting, then the additional modules RF-STABIL (to determine the bulge and branching loads) and RF-IMP (to determine the imperfection figure, based on the bulge pattern) are also recommended.
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.
AnswerRF- / STEEL EC3 measures cross-sections of cross-section class 4 using the effective width method according to EN 1993-1-5. The existing voltage is taken into account.
AnswerIf you have edited the cross-section values of a cross-section or the stiffnesses of a bar with the function "Modify stiffnesses", these are not used in the additional module STAHL EC3. The modified stiffnesses are only used in the internal force calculation. Therefore, it is better to work with double bars when using the STAHL EC3 design.
AnswerTo perform the calculation without imperfection, select the check box "L manually" (see figure) and leave the length to 0.00 meters.
That's right, both add-on modules count on the 7th. Degree of freedom, warping.
The difference is that in RF- / FE-LTB, only those loads that act directly on the set of members are automatically recognized. Loads from other structural components that have an indirect effect on the design set must be added manually as additional loads. In RF- / FE-LTB, a complete recalculation of the system takes place.
RF- / STEEL Warping Torsion, however, 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. This eliminates the load input, which saves time.
AnswerFor example, the checkbox activates the use of the simplex method also for I-profiles,which otherwise automatically with the partial section size method incl. Rearrangement be measured. If the checkbox is deactivated, the Simplex Method or the partial section size method, depending on the choice, is only used if a general cross section (for example from DuenQ) is to be dimensioned.
AnswerNo, hinges have to be defined separately in the model and cannot be generated automatically by RF-/STEEL EC3.
In Window 2.2 "Member Loads," you can define the eccentricity of the load by scrolling to the right in the table.
By using a button, you can also graphically select the stress points of a cross-section and thus define the eccentricity on the basis of the cross-section (see figure).
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