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  1. Temperature-Time Curve Diagram According to the Simplified Natural Fire Model

    Structural Fire Design According to EN 1993-1-2 (Parametric Fire Exposure)

    With RF-/STEEL EC3, you can apply nominal temperature-time curves in RFEM or RSTAB. The standard time-temperature curve (ETK), the external fire curve and the hydrocarbon fire curve are implemented. Moreover, the program provides the option to directly specify the final temperature of steel. This steel temperature can be calculated using the parametric temperature-time curve, as described in the Annex to EN 1992‑1‑2. The different fire exposures are explained in this article.

  2. Figure 01 - Importing a DXF File as Lines

    Importing a DXF File as Basis for the Modeling

    In RFEM and RSTAB, you can import DXF files via the import function. These DXF files can be used as the basis for modeling a structural system.

  3. Determination of the Maximum Horizontal and Vertical Loads to Calculate the Stability Coefficient

    Consideration of P-Delta Effects (Second-Order Analysis) in the Response Spectrum Analysis According to ASCE 7-16

    RFEM offers the option to perform a response spectrum analysis according to ASCE 7-16. This standard describes the determination of seismic loads for the US-American market. It might happen that the so-called P-Delta effect has to be considered due to the stiffness of the entire structure to be able to calculate the internal forces and carry out the design.
  4. Generation of Result Beam

    Determination of Transversal Shear Under Seismic Loads

    In RF-/DYNAM Pro - Equivalent Loads, the equivalent seismic loads can be calculated according to different standards. By calculating the equivalent loads for each eigenvalue, it is not directly possible to obtain the transversal shear for each story to perform an analysis afterwards. The following example describes the option to calculate the transversal shear quickly and efficiently.
  5. Figure 01 - Thermal Expansion of Steel

    Structural Fire Design According to DIN EN 1993-1-2 (Thermal Material Properties)

    Using RF-/STEEL EC3, you can apply nominal temperature‑time curves in RFEM or RSTAB. For this, the standard time‑temperature curve (ETK), the external fire curve and the hydrocarbon fire curve are implemented in the program. Based on these temperature curves, the add‑on module can calculate the temperature in the steel cross‑section and thus perform the fire design using the determined temperatures. This article explains the thermal behavior of structural steel as this is a direct impact on the calculation of component temperatures in RF‑/STEEL EC3.

  6. Figure 01 - Section Factor Am/V for Unprotected Steel Components (Source: [5])

    Structural Fire Design According to EN 1993-1-2 (Heating Behavior)

    Using RF-/STEEL EC3, you can apply nominal temperature-time curves in RFEM or RSTAB. For this, the standard time-temperature curve (ETK), the external fire curve, and the hydrocarbon fire curve are implemented in the program. Based on these diagrams, the add‑on module can calculate the temperature in the steel cross‑section and thus perform the fire design. This article explains the behavior of protected and unprotected steel cross‑sections.

  7. Figure 01 - Structure Composition

    Bending Beam with Circular Opening

    This article presents a bending beam with a circular opening analyzed using the numerical method. As a reference point, there is an example of a perforated beam from [1]. In our case, the 3D model was simplified to a two‑dimensional discretization.

  8. Figure 01 - Fire Curve Concepts According to DIN EN 1991-1-2

    Structural Fire Design According to EN 1993-1-2 (Fire Curves)

    Using RF-/STEEL EC3, you can apply nominal temperature-time curves in RFEM or RSTAB. The standard time-temperature curve (ETK), the external fire curve and the hydrocarbon fire curve are implemented. Moreover, the program provides the option to directly specify the final temperature of steel. This steel temperature can be calculated using the parametric temperature-time curve, as described in the Annex to EN 1992‑1‑2. The different fire exposures are explained in this article.

  9. Generate Surfaces From Member: Settings

    Generate Surfaces From Member: Settings

    In RFEM, it is possible to generate surfaces from members, for example to perform an accurate FE simulation on a member. Specific parameters such as automatic FE mesh refinement or rigid surfaces can be defined prior to the generation.

  10. 3 - Input in SHAPE-THIN

    Calculation of Shear Area in SHAPE-THIN

    Design of cross-sections usually requires many different cross-section properties. In RFEM and RSTAB, all required properties of standardized cross-sections are available in the cross-section library and can be used directly for the calculation. If the cross-sections are not standardized, SHAPE-THIN allows you to use these cross-sections, too. You can simply enter the geometry to determine all required cross-section properties. The following example shows the calculation of a shear area on a practical example.

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