VoltAir Office Façade, Berlin, Germany
The new VoltAir office building in Berlin includes a 394 ft x 213 ft area and a height close to 98 ft. The building envelope consists of multiple box elements which form the interior and exterior corners.
|Investor||Volt Berlin GmbH & Co KG|
J. MAYER H. und Partner, Architekten mbB
Metallbau Früh GmbH
Rümmele Bauingenieur GmbH
RFEM Data for Façade Corner Element
The façade elements are suspended from relatively long cantilevers/outriggers fixed to steel brackets. The steel brackets are further fastened to the concrete floors by Halfen rails or anchors. Each box element has a height of approximately 26 ft; a width of 8 ft, 10 in; a fixed support for the vertical and horizontal loads; and two additional roller supports for horizontal loads.
The model is a combination of member, surface, and solid elements with several releases and hinges to absorb tolerances and accurately model the slotted holes. The front T-sections (posts and beams) are modeled with member elements and the outriggers with solid elements to ensure correct force distribution between the front beam elements and the secondary supporting structure. The brackets are displayed as surface elements.
In the locations where screw elements intersect surfaces or solids, average regions have been defined to properly distribute the stresses. The anchor points utilize the concrete surface’s pressure points to withstand the large downward force due to self-weight. At the fixed supports, spring stiffnesses were defined to determine the allowable concrete stress and the tensile force acting on the Halfen rails. At the roller point supports, difficulties arose due to the relatively thin 8 in concrete floor, which was solved by modifying the direction of the stirrup’s slotted holes.
Rümmele Bauingenieur GmbH drew this conclusion: "The user-friendly interface of RFEM made it possible to easily make the necessary changes, which saved us a lot of time in finding practical solutions."
Project LocationAlexanderstraße & Voltairestraße
10179 Berlin, Germany
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"RFEM's user-friendly interfaceM made it possible to make the necessary changes easily, saving us a lot of time and finding practical solutions."
The support conditions of a beam subjected to bending are essential for its resistance to lateral-torsional buckling.
Facade construction | Standard lot point modeled 1: 1 according to workshop drawing in RFEM | © Rümmele Bauingenieur GmbH
RFEM model of a facade corner element with fixed points at the top as well as loose points in the middle and at the bottom | © Rümmele Bauingenieur GmbH
The tower model in the RFEM program (the entire tower on the left, detail of the steel part on the right) (© Allcons sro)
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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Stress analysis of steel surfaces and members