FAQ 002812 EN-US


Calculation RFEM RSTAB

When trying to calculate a beam structure, error message 1677 "Member No. 75: Invalid effective length factors" appears.


In RSTAB 8 and RFEM 5, it is possible to define the effective length factors that are then applied in the add-on modules.

If the described message appears, the entry of the factors in an old version has been set to 0. Due to this incomplete member definition, a calculation in the main program is not possible. To fix this, enter a value > 0.

If the effective length factors still are not relevant for the design, you can select the entire model and then open the "Edit Member" dialog box by double-clicking a member. Then, set the factors to the default value of 1.0 in the "Effective Lengths" tab.


Error 1677 Invalid effective length factors


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RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

Price of First License
3,540.00 USD
RSTAB Main Program
RSTAB 8.xx

Main Program

The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

Price of First License
2,550.00 USD