Structural vibration characteristics of a pedestrian bridge by the 3D acceleration sensing of smart sensors and detailed 3D-FEM model

In this study, we conducted fundamental study of structural health monitoring (SHM) by using 3- dimensional acceleration measurement and high resolution FE model analysis of a simple pedestrian overpass having an actual damage. Vibration measurement is performed on the pedestrian bridge by using Imote2 smart sensors. Plural vibration modes are identified from damped free vibration experiments. To reproduce the measured vibration characteristics with satisfactory accuracy for SHM in the analytical model, it is necessary to appropriately model the boundary conditions and secondary members. In this study, modelling of connecting part of main girder and stairs is examined in several patterns. Then, appropriate method of detailed FE modelling is discussed by comparing natural vibration characteristics from eigenvalue analysis.