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  1. Figure 01 - Load Case 1

    Warping Torsion Analysis According to AISC Design Guide 9

    The design of a torsional loaded beam according to AISC Design Guide 9 will be shown based on a verification example. The design will be performed with the RF-STEEL AISC add-on module and the RF-STEEL Warping Torsion module extension with 7 degrees of freedom.
  2. Figure 01 - Virtual Joists and Virtual Joist Girders in the Cross-section Database

    SJI Virtual Joists Available

    The Steel Joist Institute (SJI) has previously developed Virtual Joist tables to estimate the section properties for Open Web Steel Joists. These Virtual Joist sections are characterised as equivalent wide-flange beams which closely approximate the joist chord area, effective moment of inertia, and weight. Virtual Joists are also available in the RFEM and RSTAB cross‑section database.

  3. RF-/STEEL AISC Mode Shapes

    RF-/STEEL AISC Mode Shapes

    After running an analysis in RF-/STEEL AISC, the mode shapes for sets of members can be viewed graphically in a separate window. Select the relevant set of members in the result window and click the [Mode Shapes] button.

  4. RF-/STEEL AISC: Notional Loads to Represent Imperfections

    Notional Loads to Represent Imperfections

    In the AISC 360 – 14th Ed. C2.2, the direct analysis method requires the consideration of initial imperfections to be taken into consideration. The important imperfection of recognition is column out-of-plumbness. According to C2.2a, the direct modeling of imperfections is one method to account for the effect of initial imperfections. However, in many situations, the expected displacements may not be known or easily predicted.

  5. AISC: Direct Analysis Method and Stiffness Reduction

    Direct Analysis Method and Stiffness Reduction

    Requirements for the design of structural stability are given in the AISC 360 – 14th Ed. Chapter C. In particular, the direct analysis method provisions, which was previously located in Appendix 7 of the AISC 360 – 13th Ed., are described in detail. This method is considered an alternative to the effective length method which in turn eliminates the need for effective length (K) factors other than 1.0.

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

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

    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.

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