The structural analysis of the 3D model was performed by the German engineering office Sailer Stepan und Partner, who used structural analysis software RFEM by Dlubal Software. Furthermore, the structural engineers performed a comparative calculation by means of a beam analysis program.
Structure
The oval main building, with eleven stories, is based on three basement stories. In order to accommodate seminar rooms, restaurants, and a ballroom on the first floor, broader column grids were needed. Therefore, V‑shaped columns were arranged in the first floor. This way, it was possible to set up smaller and more efficient column grids in the upper floors. In addition, the V‑columns couple the ceiling of the first floor horizontally to the cellar.
The 10th floor (11th floor US), where the sky lounge is placed, spans an inner courtyard of a length of 34 m (112 ft). A floor-to-ceiling composite truss girder was therefore designed in this area, to which the two composite girder ceilings of the ninth and 10th (10th and 11th US) stories are connected monolithically.
As the building is designed without joints, the truss girder was integrated into the building structure without any sliding connections. With its high bending stiffness, it connects the two stiffening cores at the upper end like a beam and is elastically restrained in the adjacent walls.
As the hotel building lies in seismic zone Z2 according to SIA 261, the corresponding seismic calculations were performed in addition to the structural analysis.
| Structural Engineering | Sailer Stepan und Partner GmbH, Ingenieure für Bauwesen VBI Munich, Germany www.tragwerk.team |
