The arch bridge in Grünwald
The bridge over the river Isar near Grünwald was the first bridge to be designed and carried out by Emil Mörsch in his capacity as technical director of Wayss & Freytag AG. He described this structure in detail in the Schweizer Bauzeitung (Swiss Construction Journal) 1904, volume XLIV.
The structural system of this bridge, which was partly destroyed during the Second World War, consisted of two 70 m wide three-hinged arches with rising heights of 12.80 m. The geometry of this bridge was designed by Mörsch in such a way that the arches were only exposed to compressive, but not to tensile stress. To increase the load bearing reserves, however, each of the arches was reinforced at the top and bottom by 9 reinforcement bars Ø 28 mm. The thickness of the arch was 75 cm at the crest and 90 cm at the abutment.
A five-web reinforced concrete T-beam, which was elevated every 4 m, served as roadway slab. The total length of the bridge spanning over the river bed of the Isar and the works canal of the electric power station was 220 m. The construction period was one year and the construction costs amounted to 300.000 Marks (Reichsmark).