Fanggraben Railroad Bridge in Biebesheim am Rhein, Germany
The railroad bridge over the Fanggraben River is part of a manufacturing plant’s new construction in Biebesheim am Rhein.
LM BW Projekt GmbH & Co. KG
64584 Biebesheim, Germany
|Rail Siding Facility Draft||
Bauplanungsbüro M & K
08107 Kirchberg, Germany
|Bridge Structural Engineering||
Schröder + Raue
Ingenieurbüro für Tragwerksplanung GbR
08058 Zwickau, Germany
The plant, which manufactures railroad ties, required access over the Fanggraben River to the rail siding warehouse. The new railroad bridge spans the Fanggraben River at an incline angle of 63 gradians (56.7°).
Due to the limited distance between the top of rail to the top of the water height, the bridge’s supporting structure required minimal depth. A steel half-through bridge design constructed with a thick sheet metal deck without supporting transverse beams was selected.
The bridge dimensions include a 42-foot length, 37-foot span, and 16-foot clear width. The engineering office of Schröder + Raue from Zwickau utilized the RFEM finite element program to analyze and design the structure.
Project Location64584 Biebesheim am Rhein
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Defining the appropriate effective length is crucial to obtain the correct member design capacity. For X-bracing that is connected at the center, the engineers often wonder if the full end-to-end length of the member shall be used or using half of the length to where the members are connected is sufficient.
This article outlines the recommendations given by the AISC and provides an example on how to specify the effective length of the X-braces in RFEM.
Visualized Planning Model of New Plant with Pedestrian and Media Bridge (Middle) and New Factory Building (Top) (© Ingenieurbüro Grassl GmbH)
For the joint components, it is possible to check whether the stability failure is relevant (requires the Structure Stability add-on for RFEM 6 / RSTAB 9).
In this case, the critical load factor for all analyzed load combinations and the selected number of mode shapes is calculated for the connection model. The smallest critical load factor is compared with the limit value 15 from the standard EN 1993‑1‑1, Clause 5. Furthermore, a user-defined adjustment of the limit value is possible. Moreover, the corresponding mode shapes are displayed graphically as the result of the stability analysis.
For the stability analysis, an adapted surface model is used to specifically recognize the local buckling shapes. The model of the stability analysis, including the results, can also be saved and used as a separate model file.
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- Where can I find the materials for the corresponding National Annexes in RFEM 6 and RSTAB 9?
- How do I apply wind load on members of open structures?
- Is it also possible to use RF‑/TOWER Loading without the other TOWER add-on modules?
- I do not want to design a cross-section in the RF‑/STEEL EC3 add-on module. Can I quickly remove this cross-section from the selection?