Steel Design for RFEM 6 / RSTAB 9
Strength and Stability
“We decided to work with RFEM by Dlubal Software for the calculation of our three-dimensional steel structures after the analysis of different offers on the market. It is the software which seems to be the most suitable for analyses according to Eurocode standards. With its clear and intuitive interface, the data and the results can be entered visibly and editably in a smooth and efficient way which minimizes the effect of a "black box".
The technical support is remarkably patient, competent and responds quickly which confirmed our decision in favor of RFEM. The tutorials, the blog and the detailed user manuals allow a self-study and a comprehensive initial training and then a continuous learning of new functions. A further positive aspect is the modular structure which makes it possible to enlarge the offer based on the same main program without important learning phase. Even if we decide tomorrow to focus more in timber, aluminum or glass structures, the calculation will not be a blocking element for us.”
The Steel Design add-on allows for cross-section resistance design and stability analysis of steel member structures in the ultimate limit state. The input and result evaluation are completely integrated in the user interface of the structural FEA software RFEM and the frame & truss analysis software RSTAB.
- A wide range of available sections, such as rolled I-sections, channel sections, T-sections, angles, rectangular and circular hollow sections, round bars, symmetrical and asymmetrical, parametric I-, T- and angle sections, built-up cross-sections (suitability for design depends on the selected standard)
- Design of general RSECTION cross-sections (depending on the design formats available in the respective standard), for example, equivalent stress design
- Design of tapered members (design method depending on the standard)
- Adjustment of the essential design factors and standard parameters is possible
- Flexibility due to detailed setting options for basis and extent of calculations
- Fast and clear results output for an immediate overview of the distribution of results after the design
- Detailed output of design results and essential formulas (comprehensible and verifiable result path)
- Numerical results clearly arranged in tables and graphical display of the results in the model
- Integration of the output into the RFEM/RSTAB printout report
- Design of tension, compression, bending, shear, torsion, and combined internal forces
- Tension design with consideration of a reduced section area (for example, hole weakening)
- Automatic classification of cross-sections to check local buckling
- Internal forces from the calculation with Torsional Warping (7 DOF) are taken into account by means of the equivalent stress check (currently not for the design standards AISC 360‑16 and GB 50017).
- Design of cross-sections of Class 4 with effective cross-section properties according to EN 1993‑1‑5 (licenses forRSECTION and Effective Sections are required for the RSECTION cross-sections)
- Shear buckling check according to EN 1993‑1‑5 with consideration of transverse stiffeners
- Design of stainless steel components according to EN 1993‑1‑4
- Stability analyses for flexural buckling, torsional buckling, and flexural-torsional buckling under compression
- Import of the effective lengths from the calculation using the Structure Stability add-on
- Graphical input and check of the defined nodal supports and effective lengths for a stability analysis
- Lateral-torsional buckling analysis of the structural components subjected to moment loading
- Depending on the standard, a choice between user-defined input of Mcr, analytical method from the standard, and use of internal eigenvalue solver
- Consideration of a shear panel and a rotational restraint when using the eigenvalue solver
- Graphical display of a mode shape if the eigenvalue solver was used
- Stability analysis of structural components with the combined compression and bending stress, depending on the design standard
- Comprehensible calculation of all necessary coefficients, such as the factors for considering moment distribution or interaction factors
- Alternative consideration of all effects for the stability analysis when determining internal forces in RFEM/RSTAB (second-order analysis, imperfections, stiffness reduction, possibly in combination with the Torsional Warping (7 DOF) add-on)
The structural system is entered and the internal forces are calculated in the programs RFEM and RSTAB. There is an access to the extensive material and cross-section libraries; moreover, it is possible to create general cross-sections by using the RSECTION program.
Steel Design is completely integrated into the main programs and automatically takes into account the structure and the available calculation results. Further entries for the steel design, such as effective lengths, cross-section reductions, or design parameters, are assigned to the objects to be designed. It is possible to select the elements graphically by using the [Select] function.
After the design, the performed design checks are displayed in a table. All result details can be displayed and retraced using the clearly arranged design formulas.
The design checks are carried out at all governing locations of the members and displayed graphically as a result diagram. Furthermore, there are the detailed graphics, such as the stress distribution on a cross-section or the governing mode shape, available in the result output.
All input and result data are part of the RFEM/RSTAB printout report. You can select the report contents and extent specifically for the individual design checks.
RFEM and RSTAB programs provide parameterized input as an advantageous product feature to create or adjust models by means of variables. This article will show you how to define global parameters and use them in formulas to determine numerical values.
RF-/PLATE-BUCKLING Add-on Module for RFEM/RSTAB | Plate Buckling Analysis for Plates with or Without Stiffeners According to 1993-1-5
RF-/STEEL Fatigue Members Add-on Module for RFEM/RSTAB | Fatigue Design of Members According to EN 1993-1-9
RF-IMP/RSIMP Add-on Module for RFEM/RSTAB | Generation of Equivalent Geometric Imperfections and Pre-Deformed Initial Structures
RF-/JOINTS Steel - Tower Add-on Module for RFEM/RSTAB | Hinged Connections of Lattice Towers According to EC 3
In the case of the automatic determination of the component temperature to be applied at the design time, you can adjust the coefficients used for the temperature determination. It is also possible to select hot-dip galvanizing. According to the DASt Guideline 027 "Determination of Component Temperature of Hot-Dip Galvanized Steel Components in Case of Fire," a lower emissivity of the steel surface is applied up to a limit temperature. In the end, this results in a lower temperature for the more favorable fire resistance design.
My results of the calculation with Torsional Warping are implausible. What could be the reason?
- I cannot analyze a UPN cross-section subjected to double bending in the program. Is it possible to do this in the program?
- Where can I find the materials for the corresponding National Annexes in RFEM 6 and RSTAB 9?
- How do I apply the ASCE 7 Orthogonal Directional Combination procedure (100% + 30% rule) to my seismic load in a static analysis?
- Is it possible in the CRANEWAY software to obtain the SLS rotational deformations of a continuous beam at the supports for an isostatic beam in the web plane?
Why does the load wizard "Member Load from Area Load" give unnecessary concentrated loads?
- Why the eHORA map of Austria gives different snow loads than your Geo-Zone tool?
- In the case of stairs with a complicated geometry, it is often difficult to design welds by using the analytical methods. How can I do this with RFEM?
- How can I carry out case-related design for different load situations?
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- Why the eHORA map of Austria gives different snow loads than your Geo-Zone tool?