Arch bridge over the Isar
On August 12, 1903 the companies Wayss & Freytag and Heilmann & Littmann in Munich founded Eisenbeton GmbH and appointed Ludwig Zöllner as managing director. Under his management some remarkable bridges were built in Munich and within a radius of 30 km.
The elegant two-span bridge over the River Isar at Isarlust in Munich close to Maximilianeum, which was completed in 1898, is a good example of this. Each of the two arches has a span of 37.50 m. Since the arches are not very high (basket arches), the resulting forces do not pass into the centre of the vault so that the reinforcement has to bear the unavoidable tensile forces. It is remarkable that in 1898 neither comprehensive knowledge nor regulations existed for the construction of reinforced concrete bridges