In this study a dynamic analysis of a 77-year-old single-span steel truss railway bridge wascarried out. The study was approached by three different methods – field measurement,modal analysis using a three-dimensional finite element model of the bridge, and a simplegeneralised single degree of freedom (SDOF) analysis. Field measurement was conducted usingaccelerometers and displacement transducers, which were mounted on special sections fixedto an adjacent bridge. The finite element models of the bridge were prepared using beamand shell elements. The dynamic responses studied include the displacement, accelerationand natural frequency of the bridge. The results showed that the generalised SDOF model,with simple addition of the effects of each axle, provided reasonably accurate displacementscompared to the measured values. The generalised SDOF model, finite element model withbeam elements and finite element model with shell elements also gave reasonably accurateestimates for the natural frequency of the bridge.
展开▼
