Marina Hotel Kressbronn-Gohren at Lake Constance, Germany
The marina hotel is situated between Friedrichshafen and Lindau, on Lake Constance, one of the most attractive regions in Germany. However, this exclusive location offers some challenges which must be considered in the structural engineering. For example, actions due to wind and earthquakes are considerably increased in the area around the lake.
Ingenieurbüro Rohmer GmbH, Laupheim, Germany
|Architect||Götz Siegmann, Langenargen, Germany|
Ingenieurbüro Ugo Mordasini, Langenargen, Germany
Georg Reisch GmbH & Co. KG, Bad Salgau, Germany
Meichle + Mohr GmbH, Kressbronn, Germany
The multi-story hotel is situated in seismic zone 2. RFEM allowed to model and calculate the complex geometry in a realistic way. Using the RF‑DYNAM add-on module, the seismic design could be performed without problems.
Structure and Design
The entire design of the multi-storey hotel has been carried out in a spatial FEA model in RFEM. In addition to the load cases self-weight, live load, snow and wind, equivalent seismic loads have been taken into account.
The building consisting of several segments is stiffened by reinforced concrete frames and a staircase core. Due to the structure shape and the requirement to determine the natural frequencies, it had been obvious that a spatial calculation would be advantageous.
The hotel has a length of 134 ft, a width of 105 ft and a height of 51.5 ft. The total mass is approximately 2,100 tons.
The structural model consists of 626 nodes, 92 surfaces and 123 members. The FE mesh has 12,758 nodes and 12,923 finite elements. The calculation time for all load cases (linear analysis) was about 30 seconds.
"The multi-story hotel building is located in seismic zone 2. RFEM made it possible to model and calculate the complex geometry in a realistic way. By using the add‑on module RF‑DYNAM, seismic design could be performed without any problems. With a conventional analysis, a realistic calculation of the structure wouldn’t have been possible and would have led to significantly increased construction costs." says Anton Rohmer, the responsible structural engineer.
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Since wind on laterally open structures is not addressed in the Eurocode, the 4 cases of the German DIN 1055 Part 4 are referenced.
The material model Orthotropic Masonry 2D is an elastoplastic model that additionally allows softening of the material, which can be different in the local x- and y-direction of a surface. The material model is suitable for (unreinforced) masonry walls with in-plane loads.
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Programs Used for Structural Analysis
Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements
Design of reinforced concrete members and surfaces (plates, walls, planar structures, shells)
Dynamic analysis of natural frequencies and mode shapes of member, surface, and solid models
Dynamic and seismic analysis including time history analysis and multi-modal response spectrum analysis
Seismic and static load analysis using the multi-modal response spectrum analysis