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A platform for research: civil engineering, architecture and urbanism
Damping Estimation from Full-Scale Traffic-Induced Vibrations of a Suspension Bridge
We present an automatic technique for structural damping estimation, based on traffic-induced vibrations of a long-span suspension bridge. First, an identification algorithm is applied to the acceleration data of the Lysefjord Bridge to capture traffic load events, i.e. when vehicles are crossing the bridge. Thereafter, a time domain decomposition is adopted to compute the modal displacement response triggered by the traffic excitation. The damping ratio and the eigenfrequency are then estimated by fitting a single degree-of-freedom system to the modal response. The damping estimates exhibit a lower dispersion and bias than the corresponding results based on a covariance driven stochastic subspace identification algorithm. Estimating damping ratios using traffic-induced decays removes the problems of frequency resolution for short-length records and may, therefore, complement other ambient vibration identification techniques.
Damping Estimation from Full-Scale Traffic-Induced Vibrations of a Suspension Bridge
We present an automatic technique for structural damping estimation, based on traffic-induced vibrations of a long-span suspension bridge. First, an identification algorithm is applied to the acceleration data of the Lysefjord Bridge to capture traffic load events, i.e. when vehicles are crossing the bridge. Thereafter, a time domain decomposition is adopted to compute the modal displacement response triggered by the traffic excitation. The damping ratio and the eigenfrequency are then estimated by fitting a single degree-of-freedom system to the modal response. The damping estimates exhibit a lower dispersion and bias than the corresponding results based on a covariance driven stochastic subspace identification algorithm. Estimating damping ratios using traffic-induced decays removes the problems of frequency resolution for short-length records and may, therefore, complement other ambient vibration identification techniques.
Damping Estimation from Full-Scale Traffic-Induced Vibrations of a Suspension Bridge
Daniotti, Nicolò (author) / Cheynet, Etienne (author) / Jakobsen, Jasna B. (author) / Snæbjörnsson, Jonas (author)
ASCE International Conference on Computing in Civil Engineering 2019 ; 2019 ; Atlanta, Georgia
Computing in Civil Engineering 2019 ; 171-179
2019-06-13
Conference paper
Electronic Resource
English
Damping Estimation from Full-Scale Traffic-Induced Vibrations of a Suspension Bridge
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