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Frequently Asked Questions (FAQ)
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An imperfection can be entered manually either using the "New Imperfection Graphically" button or the menu "Insert → Load → Imperfections" (see Figure 01).
This precamber is not to be confused with an imposed precamber, in which, depending on the support condition of the member, bending moments may occur solely by entering the curvature. The load direction in the "Member Load" dialog box is to be understood as a curvature about the corresponding axis (y or z) similarly to a moment (see Figure 02).
Thus, internal forces and deformations are always taken into account in the case of the precamber as a member load (imposed precamber), whereas the precamber as an imperfection only provides internal forces and deformations if an axial force due to another load is present in the imperfect member.
Further option for entering imperfections is to use the RF‑IMP/RS‑IMP module.
The values for the precamber are not shown because the ordinate of the buckling mode is probably too small so that it cannot be considered by using the specify tolerance.
In the "Details" dialog box, you define from which ordinate of the selected buckling mode or deformation the imperfection is to be generated.
Bei der Ermittlung der Schiefstellung muss in RSIMP auch das Nachweisverfahren berücksichtigt werden. In Maske 1.2 können Sie in Spalte B nach einem Klick in die Zelle die Definitionsart festlegen.
Gemäß El. (201) brauchen bei Anwendung des Nachweisverfahrens Elastisch-Elastisch nur 2/3 der Werte angesetzt zu werden.
Stellen Sie dagegen als Definitonsart "DIN 18800 E-P" ein, so wird mit 1/200 gerechnet und Sie erhalten Ihren erwarteten Wert.
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