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  • More than 45,000 users in 95 countries
  • One software package for all application areas
  • Free support provided by experienced engineers
  • Short learning time and intuitive handling
  • Excellent price/performance ratio
  • Flexible modular concept, extensible according to your needs
  • Scalable license system with single and network licenses
  • Proven software used in many well-known projects


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  1. Stability Design Including Warping Torsion in RF-/STEEL AISC

    Warping Torsion Analysis in RF-/STEEL AISC

    By using the integrated module extension RF-/STEEL AISC Warping Torsion, the design according to the Steel Design Guide 9 can be performed in RF-/STEEL AISC.
    The calculation is effected with 7 degrees of freedom according to the warping torsion theory and allows the realistic stability design including the consideration of torsion.

  2. Graphical Display of Mode Shape in RF-/STEEL AISC

    Eigenvalue Solver for Member Design in RF-/STEEL AISC

    The determination of the critical buckling moment is carried out in RF-/STEEL AISC by using the eigenvalue solver which allows an exact determination of the critical buckling load.

    The eigenvalue solver is completed by a display window of the eigenvalue graphics which ensures the check of the boundary conditions.

  3. Definition of Lateral Restraints in RF-/STEEL AISC

    Consideration of Lateral Restraints in RF-/STEEL AISC

    In RF-/STEEL AISC, it is possible to consider lateral restraints at any location. It is, for example, possible to stabilize only the upper flange.

    Moreover, user-defined lateral restraints can be assigned, for example single rotational and translational springs at any location at the cross-section.

  4. 2.2 Design by Cross-Section

    RF-/STEEL AISC | Results

    The results sorted by load case, cross-section, member, set of members, or x-location are displayed in clearly arranged result windows. By selecting the corresponding table row, detailed information about the performed design is displayed.

    The results include a comprehensible list of all material and cross-section properties, design internal forces, and design factors.

    Parts lists by member/by set of members for the individual cross-section types complete the detailed and structures result presentation. To print the input and result data, you can use the global RFEM/RSTAB printout report.

    For further processing of various data, it is possible to export all tables to MS Excel.

  5. 1.4 Lateral Intermediate Restraints

    Working with RF-/STEEL AISC

    The AISC 360 design option is set according to ASD or LRFD. Then, the load cases, load combinations, and result combinations are selected for design consideration. Load combinations can be generated either manually or automatically according to the ASCE 7 for example in RFEM/RSTAB.

    Additional input includes intermediate lateral supports (top/bottom flange bracing), effective lengths for buckling, and other standard-specific design parameters such as the shear lag factor. For the stability analysis, you can specify for each member or set of members whether flexural buckling occurs in the strong or weak axis.
    The RF-/STEEL AISC add-on module automatically determines the slenderness ratios and elastic critical buckling loads for both members and sets of members based on the boundary conditions. The elastic critical moment for lateral-torsional buckling required for the lateral-torsional buckling analysis is automatically calculated. The load application point for transverse loads which affects the torsional resistance can be considered in the detail settings. In connection with RFEM/RSTAB, the Direct Analysis Method (Ch. C) can be considered including automatic stiffness reduction factors. In turn, the Effective Length Method (App. 7) can be used instead with Effective Length Factors directly in the module.

  6. RF-/STEEL AISC | Features

    • Design of members and sets of members for tension, compression, bending, shear, combined internal forces, and torsion
    • Stability analysis of buckling and lateral torsional buckling
    • Optional application of discrete lateral supports to beams and continuous members
    • Automatic determination of the ideal elastic critical moment Mcr for each member or set of members on every x-location according to the Eigenvalue Method or by comparing moment diagrams. You only have to define the lateral intermediate supports.
    • Module extension RF-/STEEL Warping Torsion (the licence is required) for stability analysis according to the second‑order theory as stress analysis, including consideration of 7th degree of freedom (warping)
    • Automatic cross-section classification (compact, noncompact, and slender)
    • Serviceability limit state design (deflection)
    • Cross-section optimization
    • Wide range of cross-sections available, for example rolled I-sections, C-sections, T-sections, angles, rectangular and circular hollow sections, round bars, symmetrical, asymmetrical and parameterized I- and T-sections as well as angle irons and double angles
    • Clearly arranged input and result windows
    • Detailed result documentation including references to design equations of the standard used
    • Various filter and sorting options of results including result lists by member, cross-sections, x-location, or by load case, load and result combination
    • Result window of member slenderness and governing internal forces
    • Parts list with weight and solid specifications
    • Seamless integration in RFEM/RSTAB
    • Metric and imperial units

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First Steps

First steps

We provide hints and tips to help you get started with the main programs RFEM and RSTAB.

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