- Integration in RFEM/RSTAB with automatic geometry recognition and transfer of internal forces
- Optional manual definition of connections
- Extensive library of hollow sections for chords and struts:
- Round sections
- Square sections
- Rectangular sections
- Implemented steel grades: S 235, S 275, S 355, S 420, S 450, and S 460
- Various types of connections available, depending on the standard specifications:
- K connection (gap/overlapping)
- KK connection (spatial)
- N connection (gap/overlapping)
- KT connection (gap/overlapping)
- DK connection (gap/overlapping)
- T connection (planar)
- TT connection (spatial)
- Y connection (planar)
- X connection (planar)
- XX connection (spatial)
- Selection of partial safety factors according to the National Annex for Germany, Austria, Czech Republic, Slovakia, Poland, Slovenia, Switzerland, or Denmark
- Adjustable angles between struts and chords
- Optional chord rotation of 90° for rectangular hollow sections
- Consideration of gaps between struts or overlapping struts
- Optional consideration of additional nodal forces
- Design of the connection as the maximum load-bearing capacity of the struts of a truss for axial forces and bending moments
RF-HSS Manual | Features
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Knowledge Base
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Product Feature
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In the RF‑/HSS add‑on module, you can analyze the connections for nodes at which hollow sections join. RF‑/HSS performs the ultimate limit state designs according to EN 1993‑1‑8:2005.
This technical article deals with the design of structural components and cross-sections of a welded truss girder in the ultimate limit state. Furthermore, the deformation analysis in the serviceability limit state is described.
Closed circular cross-sections are ideal for welded truss structures. The architecture of such constructions is popular when designing transparent roofs. This article shows the special features of the connection design using hollow sections.
The three types of moment frames (Ordinary, Intermediate, Special) are available in the Steel Design add-on of RFEM 6. The seismic design result according to AISC 341-22 is categorized into two sections: member requirements and connection requirements.
It is possible to select connection nodes graphically in the RFEM/RSTAB model. The relevant cross-section data and geometry are imported automatically. You can also define the parameters of hollow section connections manually. If necessary, you can modify the sections in the module.
The default angle between struts and chords can be modified as well. The geometric relation of the struts to each other is important for the correct choice of design. This relationship can be defined by specifying a gap between the struts or by overlapping them.
The design includes detailed information about analyzed internal forces, validity limits, and design conditions. Design failures are clearly marked in the result overview.
All input and result data are also documented in the general RFEM/RSTAB printout report. Separate design cases allow flexible analysis of the individual components in large structures.
A successful design check is based on the plausibility check of the geometric conditions.
The RF-/HSS add-on module performs the calculation for the following designs:
- Flange failure of chord member due to normal force
- Shear failure of chord member due to normal force
- Strut failure due to normal force
- Punching shear due to normal force
- Integration in RFEM/RSTAB with automatic geometry recognition and transfer of internal forces
- Optional manual definition of connections
- Extensive library of hollow sections for chords and struts:
- Round sections
- Square sections
- Rectangular sections
- Implemented steel grades: S 235, S 275, S 355, S 420, S 450, and S 460
- Various types of connections available, depending on the standard specifications:
- K connection (gap/overlapping)
- KK connection (spatial)
- N connection (gap/overlapping)
- KT connection (gap/overlapping)
- DK connection (gap/overlapping)
- T connection (planar)
- TT connection (spatial)
- Y connection (planar)
- X connection (planar)
- XX connection (spatial)
- Selection of partial safety factors according to the National Annex for Germany, Austria, Czech Republic, Slovakia, Poland, Slovenia, Switzerland, or Denmark
- Adjustable angles between struts and chords
- Optional chord rotation of 90° for rectangular hollow sections
- Consideration of gaps between struts or overlapping struts
- Optional consideration of additional nodal forces
- Design of the connection as the maximum load-bearing capacity of the struts of a truss for axial forces and bending moments
Is it also possible to design individual hollow sections using the HSS add‑on module?
How do I define a plastic hinge in RFEM 6?
How can I exchange data between RFEM 6 / RSTAB 9 and IDEA StatiCa?
How can I generate an area load on members via cells in RFEM 6 or RSTAB 9?
In the Steel Design add-on, I have set the boundary conditions in such a way that the I-beam flange is restrained against the horizontal displacement. I then calculated the critical load factors using the Structure Stability add-on, but with no effect on the critical load factor value. What is the reason for this?
Can I estimate which minimum cross-sections I should use before starting to design my model?
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