The Älvsborg Bridge, built in 1966, is a suspension bridge in Gothenburg, Sweden, connecting the north and south parts of the city across the Göta Älv river. The bridge has a total length of 933 m and a main span of 417 m. To support the planning of bridge renovation works, including the replacement of critical components such as the large sliding finger joints at each abutment, the use of a structural health monitoring system was proposed - in particular, to quantify the structure’s actual movements and rotations, enabling the selection and design of new expansion joints to be optimised.
A ROBO-CONTROL “Permanent” SHM system was installed in 2011, with a network of sensors providing precise records of all movements and giving a detailed understanding of the bridge’s structural behaviour. The data was used to conclude that bridge movements are less than had been expected. Such information was of great value to the bridge engineer in optimising the planning of the bridge renovation works, particularly in relation to the selection and design of the new expansion joints. The recorded data will also serve as a reference for future analysis and modification work.
ROBO-CONTROL permanent “Advanced” SHM system