Isarsteg Nord Near Freising, Germany

Structures Analysed with Dlubal Software

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Isarsteg (© Oliver Jaist)

Integration of the Slim Bridge into the Natural Setting (© Oliver Jaist)

3D Model of the Supporting Structure of Isarsteg in RFEM (© Bergmeister Ingenieure GmbH)

Customer Project

29 July 2018

Germany RFEM

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.it
Structural Design	Arch. Christoph Mayr, J2M Architekten www.j2m-architekten.de Dr.-Ing. Josef Taferner, Bergmeister Ingenieure GmbH Dr.-Ing. Oliver Englhardt, &structures www.andstructures.com
Final Planning	Dipl.-Ing. Matthias Gander und Dipl.-Ing. Philipp Prighel, Bergmeister Ingenieure GmbH Prof. Antonio Capsoni, B&C Associati www.bieciassociati.it

The bridge construction of Isarsteg as integrating artwork fits perfectly into the surrounding landscape. Taking nature as an example, the bridge overspans the Isar river like a branched limb. The ramps, stairs, columns and horizontal beams represent together the spatial framework. The pedestrian and cycle bridge, in total 160 m long, was made of weather-resistant structural steel S355 J2G2W (corten steel).

The engineering office Bergmeister Ingenieure used the programs RFEM and SHAPE-THIN for the structural analysis of the 3D structure.

Structure

The structural design of the bridge was carried out in a sutainable manner. The slim bridge is a rigid, statically indeterminated frame structure. All components, including the foundation and the abutment, are rigidly connected to each other.

The maximum span of the bridge amounts to 55 m and the width to 3.75 m. 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 15 cm and a concrete quality of C35/45. It is rigidly connected to the cover plate t = 25 mm of the steel box section by welded studs. The studs have a distance of 0.5 m in transversal direction and 0.6 m in longitudinal direction.

The bridge has been cambered by the deformation components from the self-weight. Under maximum variable load, the structure deforms by about 112 mm, which corresponds to l/504. The dynamic analysis resulted in a natural frequency of 1.33 Hz for the first mode shape. To ensure the user comfort, a vibration damper was arranged.

The aesthetic structure of the Isarsteg was awarded with the German Steel Construction Award in 2016 and with the second place at the Engineering Prize of the Bavarian Chamber of Engineers in 2017. Moreover, it received a nomination for the German Bridge Engineering Award in 2018.