Doubravka Lookout Tower in Prague - Kyje, Czech Republic
Customer Project
In June 2018, a new and unique lookout tower by the world-famous architect Martin Rajniš was opened in the Prague municipal district Kyje. When designing the tower, maximum emphasis was placed on natural and renewable material use.The lookout tower structure is constructed with 3.15 in diameter acacia logs. The main supporting structure includes three legs where a spiral staircase is also suspended. The tower legs are made of a lattice structure in the shape of an elongated barrel. At the top, the legs are interconnected with three steel hoops and a triangular steel structure.The tower is 77.1 ft high with the observation platform located 65.5 feet above the ground elevation. The observation tower can hold up to 9 people during typical operations.
| Investor | Landia Management s.r.o |
| Operator | Prague 14 Municipal District |
| Architect |
Huť architektury Martin Rajniš s.r.o. Prof. Ing. arch. Martin Rajniš |
| Structural Analysis |
STATIC Solution s.r.o. Ing. Tomáš Fremr, Ph.D. |
Model
Structural Analysis
The RFEM model was initially created by importing the architectural model from AutoCAD. End releases were conservatively applied to all members even though many members overlap.
The RFEM calculation included a second-order analysis with the Picard method. For the design, a possible progressive collapse of the structure was taken into consideration where one of the highly loaded elements may fail (break). The model was also used to verify the various construction stages when installing the structure with cranes.
Project Location
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New
Modeling Downstand Beams in Cross-Laminated Timber Constructions with Ribs
This time, we want to look at modeling downstand beams by means of ribs.
The cross-section resistance design analyzes tension and compression along the grain, bending, bending and tension/compression as well as the strength in shear due to shear force.
The design of structural components at risk of buckling or lateral-torsional buckling is performed according to the Equivalent Member Method and considers the systematic axial compression, bending with and without compressive force as well as bending and tension. Deflection of inner spans and cantilevers is compared to the maximal allowable deflection.
Separate design cases allow for a flexible and stability analysis of members, sets of members, and loads.
Design-relevant parameters such as the stability analysis type, member slendernesses, and limit deflections can be freely adjusted.
- How can I create a curved or arched section?
- How are the signs for the release results of a line release and line hinges interpreted?
- After the design with RF‑/TIMBER Pro, I optimized a cross-section. Why is the utilization of the optimized cross-section exceeded now?
- Is it possible to design the support pressure or the compression perpendicular to the grain in RX‑TIMBER?
- Why are the stresses of the 90° orientation not displayed for a layer with the orthotropy direction 90° for σb,90 in RF‑LAMINATE?
- How can I get the member end forces to design the connections?
- How can I create a drilled beam in RFEM?
- I design timber components. The deformations of load combinations deviate from the manual calculation exactly by the factor of the material partial safety factor. Why?
- How can I run the RX‑TIMBER Frame plugin? I did not find it in the Add-on Modules menu nor in Project Navigator - Data.
- I have a question about the results of the serviceability limit state design: How is the increment of the dead load by the factor 1.8 and the imposed load by 1.48 explained in the result combinations for the SLS design?
