Met Mast on Radstadt Tauern, Austria
The construction of a 328-foot-high tower at an altitude of about 6,890 ft above sea level is a particularly challenging task. A project of this type was realized in September 2020 in the area of the "Windsfeld" summit in Flachau / Flachauwinkl, Austria. The met mast is one of the tallest structures in Austria.
|Structural Design, Assembly Assistance||
The Dlubal customer m3-ZT GmbH performed the structural analysis and design of the tower, including the planning and calculation of the construction details. They utilized RFEM for the structural analysis and design. Additionally, the engineers from m3-ZT supported the assembly at this incredible height.
Structure and Structural Design
The 328-foot-high truss tower has a triangular floor plan and consists of tubular steel sections. The center distance between the three main columns is about 1 ft. Every 33 ft, the slender mast is fixed by steel cables. Depending on the load, the cables have a diameter between 0.47 in. and 0.75 in.
The structure was designed for an average wind speed of vb,0 = 101.71 ft/s (according to the Central Institution for Meteorology and Geodynamics report [ZAMG]). m3-ZT GmbH generated wind loads utilizing RWIND Simulation and imported them to the RFEM model. The civil engineering office of DI Stallinger Johann+Partner from Upper Austria carried out the verification of the structural analysis and design. This office utilized a different structural analysis and design software and applied the wind loads according to the standard (EN 1991-1-4). One result of the verification was that the support forces from wind in both models only differed by a maximum of 2%.
Industrial climbers and a helicopter helped to assemble the mast. The tower will carry out wind measurements over a period of 1.5 years.
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RFEM/RSTAB add-on module RF-/JOINTS Steel-Tower | Hinged connections of lattice tower members according to EC 3
RFEM/RSTAB add-on module RF-/TOWER effective lengths | Determination of effective lengths of lattice towers
The tower model in the RFEM program (the entire tower on the left, detail of the steel part on the right) (© Allcons sro)
Look-out Tower Model (Left) and Deformation Image (Right) in RFEM (© Ingenieurbüro Braun GmbH & Co. KG)
SHAPE-THIN determines the effective cross-sections according to EN 1993-1-3 and EN 1993-1-5 for cold-formed sections. You can optionally check the geometric conditions for the applicability of the standard specified in EN 1993‑1‑3, Section 5.2.
The effects of local plate buckling are considered according to the method of reduced widths and the possible buckling of stiffeners (instability) is considered for stiffened sections according to EN 1993-1-3, Section 5.5.
As an option, you can perform an iterative calculation to optimize the effective cross-section.
You can display the effective cross-sections graphically.
Read more about designing cold-formed sections with SHAPE-THIN and RF-/STEEL Cold-Formed Sections in this technical article: Design of a Thin-Walled, Cold-Formed C-Section According to EN 1993-1-3.
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