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  1. Cantilever with Lateral Support

    Influence of the Parameters for Lateral-Torsional Buckling on the Design in RF-/STEEL EC3

    The input windows in RF-/STEEL EC3 distinguish between the flexural and lateral-torsional buckling analysis. In the following, an example will show the parameters for lateral-torsional buckling.

  2. Figure 01 - Structure

    Entering Lateral Supports and Their Effects in RF-/STEEL EC3

    When designing steel columns or steel beams, it is usually necessary to carry out cross-section and stability analyses. In most cases, cross-section design can be carried out without giving further details; the stability design, however, needs additional user-defined specifications. To a certain extent, the member is cut out from the structure and therefore, the support conditions have to be specified. This is particularly important to determine the ideal critical moment for lateral torsional buckling Mcr. In addition, the correct effective lengths Lcr have to be defined. They are necessary for the internal calculation of the slenderness ratios.
  3. Figure 01 - Generate Catenary

    Assistance Tools for Cable Structures

    RFEM and RSTAB are able to cover a large number of branches in the field of building and construction industry with their generally usable structural frame analysis and FEM programs. The design of cable structures is thus also possible in both software solutions. In the following, some assistance tools for modeling and design will be presented.
  4. Figure 01 - System

    Pipes under internal pressure load

    Piping systems are exposed to a variety of loads. Among the most authoritative is the internal pressure. This article will therefore deal with the stresses and deformations resulting from a pure internal pressure load in the pipe wall or for the pipe.
  5. Redistributing Shear Stresses from Null Elements

    SHAPE-THIN allows you to calculate section properties and stresses of any cross‑sections. If a flange or a web is weakened by bolt holes, you can consider this by using null elements. The stresses are subsequently recalculated with the reduced cross‑section values. In this case, it is necessary to pay special attention to shear stresses. By default, these are set to zero in the area of the null elements. When recalculating shear stresses with the reduced cross‑section values and without further adaptation, it turns out that the integral of the shear stresses is no longer equal to the applied shear force. The following example shows in detail how to calculate the shear stress.

  6. Figure 01 - Combinatorics

    Load Combinations for Pipe Stresses due to Occasional Loads

    The add-on modules RF-PIPING and RF-PIPING Design allow you to design piping systems according to EN 13480-3 [1], ASME B31.1 and B31.3. In the case of the European standard, the determination of pipe stresses is based on the formulas of Section 12.3 Flexibility analysis. Depending on the stress type, one or more resulting moments is applied without regard to each other. This differentiation occurs when determining the stresses due to occasional loads, for example.

  7. Figure 01 - Result Combinations

    Result Combinations 2 | Application Example and Comparison with Load Combinations

    My previous article Result Combinations 1 explained the basic principles of result combinations on simple examples. This article describes a further application case, which combines the definition options of Example 1 and Example 2. Likewise, the effort should be compared to a combination by means of load combinations.

  8. Figure 01 - Result Combination

    Result Combinations 1 | Basis

    RFEM and RSTAB provide two different methods for the superposition of load cases. Using load combinations, the loads of individual load cases are superimposed and calculated in a ‘big load case’. On the other hand, result combinations only combine the results of the individual load cases. This article describes the basis of defining result combinations and explains it in detail in two examples.

  9. Axial Expansion Joint in RF-PIPING

    Axial Expansion Joint

    In RF‑PIPING, it is now possible to use axial expansion joints. These are applied to absorb movements of extension and compression in the axis direction due to thermal expansions of piping.

  10. Synchronized Selection in Project Navigator

    Synchronized Selection in Project Navigator

    RFEM and RSTAB provides a wide range of selection options. Some of the previous posts have already described selection using ‘Special Selection’ or tables.

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