Passive and Adaptive Damping Systems for Vibration Mitigation and Increased Fatigue Service Life of a Tied Arch Railway Bridge

In this paper, the use of external damping systems for vibration mitigation of railway bridge dynamics is studied. Theoretical analysis and numerical simulations are presented based on both passive and adaptive tuned mass dampers (TMD). Routines for a variable stiffness TMD in combination with incremental frequency estimates are developed and its performance under different loadings is studied. The potential of the dampers are studied on a tied arch railway bridge by means of numerical simulations. The bridge has earlier been the subject of extensive dynamic assessments and available field measurements of the response during train passage are reanalyzed and used for model calibration. Both field measurements and numerical simulations show resonant behavior of several hangers during train passage. Due to low structural damping, the resulting stresses are shown to significantly reduce the fatigue service life. A system of passive pendulum dampers was installed in 2005, proving an increased damping ratio due to free vibrations. Its performance during train passage was however not measured. The dynamic response is studied for different damping models based on a calibrated 3D finite element model. The response is highly sensitive to the train speed due to the risk of resonance. Fragility curves are adopted to estimate the extent of cumulative damage under mixed traffic loads at variable speeds.

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