ESTIMATION OF BRIDGE DEFLECTION RESPONSE UNDER PASSING TRAIN LOADS BASED ON ACCELERATION

Abstract

 In this study, a methodology for the displacement response estimation based on the acceleration response observed on the railway bridges under passing train loads by applying the sequential data assimilation was proposed. In particular, The linear dynamic analysis using finite element models was included in the framework of the merging particle filter which is one of the sequential data assimilation techniques, and the methodology which corrects a simulation model and its output sequentially by the acceleration response was constructed. Through the application to numerical computations and field tests targeting a RC simple beam and a RC rigid-frame bridge, It was confirmed that although a problem remains in the estimation of a modal damping ratio, the proposal methodology could estimate the displacement response at the time of a train running with sufficient accuracy on both bridges.