INVERSE ANALYSIS OF NONLINEAR BEHAVIOR FOR RAILWAY POLES BUILT ON BRIDGES UNDER TRAIN PASSAGE

Abstract

Railway poles vibrate significantly when high-speed railway passes. There are the reference values to avoid damage to the electrical wires. However, the reference values do not take into account the non-linearity caused by the wire restraint. This study proposes a Time-Varying Auto Regressive with eXogenous (TV-ARX) model that clarifies the pole natural frequency, which increases instantaneously with wire restraint. The proposed model is obtained by reformation of the existing model, such that the railway bridge deformation is replaced by the excitation force on the railway pole. The proposed model is applied to the measured displacement response of the railway pole and the railway bridge when a railway passage. It was shown that the relationship between the railway pole displacement and the estimated railway pole natural frequency. In addition, it was clarified that the current reference values are also valid for the pole on operating lines.