Nonlinear Dynamic Analysis of Railway Viaduct with Centenary Poles for updating Seismic Design Code

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Catenary poles set on railway viaducts fell down and caused trains to be stopped due to the Great East Japan Earthquake even though the viaducts were not damaged severely. To evaluate not only the seismic performance of a viaduct but also that of poles set on it, in this study, nonlinear dynamic analysis was conducted using models of poles and a viaduct considering their material nonlinearity and geometric nonlinearity. The results of analysis reproduce the real damage situation of catenary poles and viaducts in Tohoku district. And one of the results shows that the design input ground motion for catenary poles is not so influential to them. Therefore, it is suggested that design ground motion should be reconsidered.