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In October 2011, the sailing ship Alexander von Humboldt II started its service and has been conquering the seas ever since. The ship, operated by the German Sail Training Foundation (DSST), is a barque rigged with three masts. The masts and the hull consist of steel.
It is the first new vessel of a German tall ship after the construction of the Gorch Fock, the training ship of the Navy. On the Alex II, you can enjoy sailing trips lasting one or more days or learn to sail on special training trips.
HB Hunte Engineering GmbH was responsible for the construction of the new ship. Marine Engineering Wollert GmbH performed calculations of the rigging (the masts and the cordage holding the masts) as well as strength calculations of the hull. Both of them have been Dlubal customers for many years and use RFEM for their analyses.
Rig of Sailing Ship
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Customer Project / View Only
| Number of Nodes | 340 |
| Number of Lines | 423 |
| Number of Members | 422 |
| Number of Surfaces | 5 |
| Number of Load Cases | 35 |
| Number of Load Combinations | 12 |
| Number of Result Combinations | 3 |
| Total Weight | 25.793 tons |
| Dimensions (Metric) | 65.015 x 9.720 x 38.218 m |
| Dimensions (Imperial) | 213.3 x 31.89 x 125.39 feet |
| Program Version | 4.10.07 |
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A two-stage calculation is necessary to correctly model and calculate floating bodies (special rafts, pontoons, floating jetties, dredgers, floating houses, inflatable islands, floating cranes, houseboats, etc.).
The deformations of the FE nodes are always the first result of an FE calculation. It is possible to calculate strains, internal forces, and stresses based on these deformations and the stiffness of the elements.
Plate girder is an economical choice for long spans construction. I-section steel plate girder typically has a deep web to maximize its shear capacity and flange separation, yet thin web to minimize the self-weight. Due to its large height-to-thickness (h/tw) ratio, transverse stiffeners may be required to stiffen the slender web.
In this article, you will learn how to model and design cable structures in RFEM 6 or RSTAB 9.
Various design parameters of the cross-sections can be adjusted in the serviceability limit state configuration. The applied cross-section condition for the deformation and crack width analysis can be controlled there.
For this, the following settings can be activated:
- Crack state calculated from associated load
- Crack state determined as an envelope from all SLS design situations
- Cracked state of cross-section - independent of load
In the "Deflection and Design Support" tab under "Edit Member", the members can be clearly segmented using optimized input windows. Depending on the supports, the deformation limits for cantilever beams or single-span beams are used automatically.
By defining the design support in the corresponding direction at the member start, member end, and intermediate nodes, the program automatically recognizes the segments and segment lengths to which the allowable deformation is related. It also automatically detects whether it is a beam or a cantilever due to the defined design supports. The manual assignment, as in the previous versions (RFEM 5), is no longer necessary.
The "User-Defined Lengths" option allows you to modify the reference lengths in the table. The corresponding segment length is always used by default. If the reference length deviates from the segment length (for example, in the case of curved members), it can be adjusted.
This feature also contributes to the clearly-arranged display of your results. Clipping planes are intersecting planes that you can place freely throughout the model. The zone in front of or behind the plane is consequently hidden in the display. This way, you can clearly and simply show the results in an intersection or a solid, for example.
The results of solid stresses can be displayed as colored 3D points in the finite elements.
Can I use surface releases to separate two overlapping surfaces?
I have calculated a box girder. Which surface results or surface stresses can I use to evaluate the buckling behavior of the web plates?
What is the component-based finite element method (CBFEM)?
Can I calculate a composite beam with RFEM 6?
How can I deactivate the automatic self-weight for a particular member in my model?
How can I reduce the calculation time for members with a nonlinear material model in RFEM 6 and RSTAB 9?
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