The engineering office Bergmeister Ingenieure used the RFEM and SHAPE-THIN programs for the structural analysis of the 3D structure.
Structure
The structural design of the bridge was carried out in a sustainable manner. The slim bridge is a rigid, statically indeterminate frame structure. All components, including the foundation and the abutment, are rigidly connected to each other.
The maximum span of the bridge amounts to 180 ft and the width to 12.30 ft. The superstructure, the columns, and the stairs consist of keel-shaped, torsional rigid box sections.
The bridge deck consists of a reinforced concrete flange with a thickness of 5.9 inches and a concrete quality of C35/45. It is rigidly connected to the cover plate t = 0.98 inches of the steel box section by welded studs. The studs have a distance of 1.64 ft in the transverse direction and 1.97 ft in the longitudinal direction.
The bridge has been cambered by the deformation components from the self-weight. Under the maximum variable load, the structure deforms by about 4.4 inches, which corresponds to l/504. The dynamic analysis resulted in a natural frequency of 1.33 Hz for the first mode shape. To ensure user comfort, a vibration damper was arranged.
The esthetic structure of the Isarsteg received the German Steel Construction Award in 2016 and second place in the Engineering Prize of the Bavarian Chamber of Engineers in 2017. Moreover, it received a nomination for the German Bridge Engineering Award in 2018.
| Client | City of Freising, Building Division of the Municipal Administration for Road and Bridge Construction www.freising.de |
| Project Management, Structural Analysis | Bergmeister Ingenieure GmbH www.bergmeister.eu |
| Structural Design | Arch. Christoph Mayr, J2M Architekten www.j2m-architekten.de Dr.-Ing. Josef Taferner, Bergmeister Ingenieure GmbH Dr.-Ing. Oliver Englhardt, &structures |
| Final Planning | Dipl.-Ing. Matthias Gander und Dipl.-Ing. Philipp Prighel, Bergmeister Ingenieure GmbH Prof. Antonio Capsoni, B&C Associati www.bieciassociati.it |
