Member Stiffness According to AISC 360-10 C2.3(2)

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As of RFEM version 5.06, the member stiffnesses can be influenced by methods that are aligned with the US steel construction standard ANSI/AISC 360-10. According to this standard, a reduction factor τb must be considered for the determination of internal forces in all members whose flexural resistance contributes to the model's stability. This coefficient depends on the axial force in the member: The larger the axial force, the larger is τb.

τb can be determined iteratively. For this, the design method must be specified (LRFD or ASD). Then, RFEM calculates the coefficient according to equation (C2-2a) or (C2-2b) in several steps until a convergence occurs.


Dipl.-Ing. (FH) Robert Vogl

Dipl.-Ing. (FH) Robert Vogl

Technical Editor, Product Engineering & Customer Support

Mr. Vogl creates and maintains the technical documentation. In addition, he is involved in the development of the SHAPE-THIN program and provides customer support.


Member stiffness Reduction factor LRFD ASD Flexural resistance Axial stiffness


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  • Updated 10/26/2020

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RFEM Main Program
RFEM 5.xx

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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

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