STEEL Fatigue Members: Fatigue Design According to EC 3

Add-on Module for RSTAB 8

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STEEL Fatigue Members Add-on Module for RSTAB 8

The STEEL Fatigue Members add-on module allows you to perform fatigue design of steel members or set of members according to EN 1993‑1‑9. The fatigue design checks according to EN 1993‑1‑9 are based on the nominal stress concept. The internal forces are determined according to the structural analysis for members. The stresses are calculated according to the mechanics of materials at the location where the crack formation is expected. This means that in the fatigue design, the nominal stress ranges Δσ and Δτ are compared to the design values of the fatigue strength ΔσR and ΔτR due to the actions.

The STEEL Fatigue Members add-on module includes an extensive cross-section library and an extensible material library with the standard-specific strength values.

Fatigue Design of Members and Sets of Members

Total items: 4

RF-/STEEL Fatigue Members Add-on Module for RFEM/RSTAB | Fatigue Design of Members According to EN 1993-1-9

RF-/STEEL Fatigue Members | Features

Full integration in RFEM/RSTAB including import of all relevant information and internal forces
Determination of stress ranges for the available load cases and load or result combinations
Free assignment of detail categories on the available stress points of the cross-section
User-defined specification of damage equivalent factors
Design of members and sets of members according to EN 1993-1-9
Optimization of cross-sections with the option to transfer the data to RFEM/RSTAB
Detailed result documentation with references to design equations 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
Visualization of the design criterion on RFEM/RSTAB model
Data export to MS Excel

RF-/STEEL Fatigue Members | Input

After opening the add-on module, it is necessary to define designed members/sets of members, load cases, load or result combinations for the fatigue strength design.

The materials from RFEM/RSTAB are preset and can be adjusted in RF-/STEEL Fatigue Members. The material properties listed in the respective standard are included in the material library.

The design requires damage equivalent factors as well as detail categories on the designed stress points to be considered in the calculation.

RF-/STEEL Fatigue Members | Design

The fatigue strength design is based on the analysis using damage equivalent factors. The damage equivalent stress ranges Δσ_E,2 and Δτ_E,2 related to 2*10⁶ stress cycles have to be compared to the limit values of the fatigue strength Δσ_C or Δτ_C for 2*10⁶ stress cycles of the corresponding detail, taking into account the partial safety factors.

In this way, the individual design requirements are specified. Separate design cases enable flexible analysis of selected members, sets of members, and actions, as well as of individual cross‑sections. Design-relevant parameters such as B. selecting the design concept as well as partial safety factors can be defined freely.

RF-/STEEL Fatigue Members | Results

After the calculation, the module displays results in clearly arranged result tables. All intermediate values (for example, governing internal forces, adjustment factors, and so on) can be included in order to make the design more transparent. The results are sorted by load case, cross-section, set of members, and members.

If the analysis fails, the affected cross-sections can be modified in an optimization process. It is also possible to transfer the optimized cross-sections to RFEM/RSTAB for a new calculation.

The design ratio is represented with different colors in the RFEM/RSTAB model. This way, you can quickly recognize critical or oversized areas of the cross-section. Furthermore, result diagrams displayed on the member or set of members ensure targeted evaluation.

In addition to the input and result data, including design details displayed in tables, you can add all graphics into the printout report. This way, comprehensible and clearly arranged documentation is guaranteed. You can select the report contents and extent specifically for the individual designs.

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