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 a 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)
New
Compared to the RF-/STEEL EC3 add-on module (RFEM 5/RSTAB 8), the following new features have been added to the Steel Design add-on for RFEM 6 / RSTAB 9:
- In addition to Eurocode 3, other international standards are integrated (e.g. AISC 360, CSA S16, GB 50017, SP 16.13330)
- Consideration of hot-dip galvanizing (DASt guideline 027) in the fire protection design according to EN 1993-1-2
- Input option for transverse stiffeners that can be taken into account in the shear buckling analysis
- Lateral-torsional buckling can also be checked for hollow sections (e.g. relevant for slender, high rectangular hollow sections)
- Automatic detection of members or member sets valid for the design (e.g. automatic deactivation of members with invalid material or members already contained in a set of members)
- Design settings can be adjusted individually for each member
- Graphical display of the results in the gross section or the effective section
- Output of the used design check formulas (including a reference to the used equation from the standard)
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- I have a roof structure resting on a steel column that runs to the foundations. The column runs through a perimeter wall that supports the false ceiling. A considerable part of the load from the roof is transferred to the wall. I want the steel column to carry all the vertical loads from the roof. How can I do it?
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