Structural Identification to Improve Bridge Management

摘要

This paper presents results from static loads tests performed on the new Langensand Bridge built inrnSwitzerland. A systematic study of over 1000 models subjected to three load cases identifies a set ofrn11 candidate models through static measurements. Predictions using the set of candidate models arernhomogenous and show an averaged discrepancy ranging of 4 to 7% from the displacementrnmeasurements. All candidate models have values for material proprieties that are close to expectedrnvalues. This finding confirms that the behaviour of the structure conforms to the designrnexpectations. Comparing the candidate model set to a design model that takes into account onlyrnmain structural elements shows that the structure has approximately 30% reserve capacity withrnrespect to a typical deflection risk scenario according to Swiss codes. The population of candidaternmodels may be used to understand and predict the behaviour of the full bridge prior to itsrncompletion.