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  1. Differences Between the Analytical and Nonlinear Deformation Analysis of Reinforced Concrete

    Different methods are available for calculating the deformation in the cracked state. RFEM provides an analytical method according to DIN EN 1992-1-1 7.4.3 and a physical-nonlinear analysis. Both methods have different features and can be more or less suitable depending on the circumstances. This article will give an overview of the two calculation methods.

  2. Figure 01 - Adjusted Value Range

    Documenting Graphical Results of Reinforcement in RF-CONCRETE Surfaces

    RFEM offers different options to display results graphically which have been determined in RF-CONCRETE Surfaces. This article gives an overview of these options.
  3. Figure 01 - Setting: Reinforcement Direction With Main Tension Force in the Considered Element

    Secondary Reinforcement According to DIN EN 1992-1-1 9.2.1 to Ensure Ductile Structural Component Behavior

    The secondary reinforcement according to DIN EN 1992-1-1 9.2.1 is used to ensure the desired structural behavior. It should avoid failure without prior notification. The minimum reinforcement has to be arranged independently of the size of the actual loading.
  4. Figure 01 - Exemplary Display of Singularity and Countermeasure

    Singularities in Design of Reinforced Concrete Surfaces

    Singularities occur in a limited area due to the concentration of the stress-dependent result values. They are conditioned by the FEA methodology. In theory, the stiffness and/or the stress in an infinite size concentrate on an infinitesimal small area.

  5. Figure 01 - M1: Member Structure in Rendered View

    Downstand Beams, Ribs, T-Beams: Deformation and Deflection in Cracked State

    RFEM and the RF‑CONCRETE add‑on modules provide various options for the deformation analysis of a T‑beam in cracked state (state II). This technical article describes the calculation methods (C) and modeling options (M). Both the calculation methods and the modeling options are not limited to T‑beams, but will only be explained using an example of this system.

  6. Figure 01 - Partial Cross-Sections with Example of Distribution of Mean Concrete Stress

    Downstand Beams, Ribs, T-Beams: Minimum Reinforcement for Partial Cross-Sections According to 7.3.2

    According to Section 7.3.2 (2), the standard EN 1992‑1‑1 [1] states: “In profiled cross‑sections like T‑beams and box girders, minimum reinforcement should be determined for the individual parts of the section (webs, flanges).”

    In the case of a T‑beam with a T‑section, the minimum reinforcement should be determined for both the chord and the web if the corresponding partial cross‑sections are in the tension area. Figure 01 shows the cross‑section classification.

  7. Figure 01 - Effective Flange Width Parameters ([1], Figure 5.3)

    Downstand Beams, Ribs, T-Beams: Specifics in Design

    In the case of combined FEM structures (surface and member elements) as well as folded plate structures, it is possible to attribute a beam structure for the design on a member to a fictitious T‑beam cross‑section, whose geometry depends on the effective width. When using the “Rib” member type in RFEM, the stiffness is represented by a slab component (surface element) and a web component (member element). This approach has some design specifics, which are explained in this article.

  8. Effective Concrete Tensile Strength at Time of Cracking in RF-CONCRETE Members

    Effective Concrete Tensile Strength at Time of Cracking

    As of the program version 5.06, you can use the option to adjust the effective concrete tensile strength fct,eff,wk at the time of cracking. At the start of the SLS design, the program checks whether the internal forces can cause cracks in the concrete. For this, the effective concrete tensile strength at the time of cracking is applied. You can adjust the strength via the factor. The calculation details display the adjusted value.

  9. Simultaneously Editing Several Tendons in RF-TENDON

    Simultaneously Editing Several Tendons

    As of the program version RFEM 5.06, it is possible to edit several tendons in the RF‑TENDON add‑on module at the same time. For this, it is necessary to select the corresponding tendons in the table of tendon arrangement.

  10. Design Situation Settings for SLS Checks in RF-CONCRETE Surfaces and RF-CONCRETE Members

    Design Situation Settings for SLS Checks

    As of the program version 5.06, RF‑CONCRETE Surfaces and RF‑CONCRETE Members perform the serviceability limit state designs automatically according to the design situation of the calculated load cases, load combinations and result combinations.

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