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

Tips & Tricks

As of the RFEM version 5.06, it is possible to influence member stiffnesses according to a method adapted to the US standard ANSI/AISC 360‑10 for steel structures. According to this standard, the reduction factor τb must be considered in all members when determining internal forces as the flexural resistance of them provides stability to the model. This factor depends on the axial force in a member: The greater the axial force is, the greater τb is also.

τb can be determined iteratively. For this, you should specify the design method (LRFD or ASD). Then, RFEM calculates the factor according to Equation (C2‑2a) or (C2‑2b) in several steps until the convergence is reached.

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