Canal Bridge Structure over Ems River No. 911 N – Bypass, Germany
The Ems Canal Bridge (KBr), built in the 1930s, will be renovated at DEK-km 78.806N as part of the German Dortmund-Ems Canal (DEK) expansion effort. A double half-through bridge is planned for the new structure, where construction will begin while the shipment is in progress.
Federal Waterways and Shipping Agency, WNA Datteln, Germany
|Structural Design, Superstructure Planning Execution||
Meyer + Schubart VBI, Wunstorf, Germanywww.meyer-schubart.de
|Steel Superstructure Execution||
SEH Engineering GmbH, Hanover, Germany
At the beginning of the renovation, a bypass route will be constructed: The longitudinal insertion of the half-through bridge into the bypass location took place in October 2020. The bridge will be moved to its final position after the second section is complete.
Dlubal's customer Meyer+Schubart from Wunstorf (Germany) provided the structural design as well as the superstructure execution planning. The entire steel superstructure was modeled and designed as a 3D model in RFEM, using planar shell elements.
The half-through bridge spans 205 ft with a total width of 118 ft. It is supported on 108-foot-wide, 22-foot-thick and 18-foot-high abutments. Three spherical supports are provided for each support. In the water-filled operating state, support forces of up to 7,870 kips act on the outer supports.
Between the tail units, the navigable width is 85 ft and the hydraulic width is 92 ft. On the sides (top of the barrier walls) are 16-foot-wide (east side) and 10-foot-wide (west side) service paths. The bridge bottom forms the bottom chord and the service paths form the cross-section top chord for the structural design.
For the design of the canal bridge, variable actions such as hydrostatic + hydrodynamic actions, ice load + ice pressure, temperature, as well as extraordinary actions such as disaster vessel impact (vessel impact with a 6° approach angle), and a sunken vessel load were applied. The structure is designed for 100 years of service life, according to Eurocode.
Do you have further questions or need advice? Contact us via phone, email, or chat or find suggested solutions and useful tips on our FAQ page available 24/7.
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.
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.
- Is it possible to calculate the weld stresses between surfaces with RFEM 6?
- How can I neglect torsion in the steel and timber design?
- Is it possible to display the deformation analysis of a surface (limit 0.5‰)?
- Does RFEM 6 include the combinations for road bridges according to EN 1991‑2?
- How do I perform stability analysis to determine the critical load factor in RFEM 6?
- How can I optimize cross-sections within the steel design?
- 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?