Steel Frame Structure with Tension Members
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Description
For the stability design of members and sets of members with a uniform cross-section, you can use the equivalent member method according to EN 1993-1-1, 6.3.1 to 6.3.3. However, as soon as a tapered cross-section is available, this method can no longer be used or only to a limited extent. This model was used to show how RF-/STEEL EC3 recognizes such cases automatically and switches to the General Method.
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Keywords
Stability design Equivalent member method Tapered member Taper General method
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Design of Tapered Single-Span Beam According to Eurocode 3
The following article describes the design of a single‑span beam subjected to bending and compression, which is performed according to EN 1993‑1‑1 in the RF‑/STEEL EC3 add‑on module. Since the beam is modeled with a tapered cross‑section, and thus it is not a uniform structural component, the design must be performed either according to the General Method in compliance with Ch. 6.3.4 of EN 1993‑1‑1, or according to the second‑order analysis. Both options will be explained and compared, and for the calculation according to the second‑order analysis, an additional design format using the Partial Internal Forces Method (PIFM) is available. Therefore, the design is divided into three steps:
- Design according to Ch. 6.3.4 of EN 1993‑1‑1 (General Method)
- Design according to the second‑order analysis, elastic (warping torsion analysis)
- Design according to the second‑order analysis, plastic (warping torsion analysis and Partial Internal Forces Method)
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Application of Connections to the Structure | Steel Joints
- The proposed connection can be applied to all selected nodes in the structure
- The location of the connection can be defined using the "Main" tab of the Add-on dialog box
- The design is performed for all connections in the structure and after the calculation, the results on all connections can be displayed
- The table shows the results for the individual connections, each connection is designed and can be saved separately
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How do I set a release for warping?
- How can I define a warping spring or a warping restraint?
- At which point on a cross-section are the supports and loads assumed for the calculation with warping torsion?
- The limit stress is activated, but my stress ratio is “non-designable” in the Stress-Strain Analysis add-on. What could be the reason?
- How can I deactivate the 7th degree of freedom for certain members or cross-sections only?
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- How can I define a warping spring or a warping restraint?
