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Puente para la autopista Lausana-San Mauricio

1964; Spanish National Research Council; Volume: 17; Issue: 166 Linguagem: Espanhol

10.3989/ic.1964.v17.i166.4468

1988-3234

Roland Hofer,

Structural Engineering and Vibration Analysis

As Switzerland is modernising its road network, and the National Exhibition at Lausanne will also place increased demands on road transport, the construction of the new bridge over the river Sorge has been urgently started. This bridge has two independent sections for the traffic in each direction. During the first phase a single bridge was built, and later a second one will be added. Present day Swiss road specifications are being used for the design of these structures. The bridge is about 180 ms long, runs 40 m over the valley, and consists of three spans, of 48, 82 and 48 m length. Its concrete deck is a box section, whose depth varies between 1.80 m at the springers, to 4.40 m, over the piles. The central span has been built cantilevering it from either side, and the other spans according to the standard practice in these cases. Owing to the great height of the piles, and the poor quality of the soil, a very detailed study of the subsoil was necessary, both below the piles, and at the two extremities of the bridge. A special source of difficulty was the calculation of the various positive and negative deflections that had to be foreseen so that the two cantilevered branches should meet at the centre span. To achieve this, the prestressing cables, and their loading were planned most accurately.