A Study of Development for Steel Bridge Piers by the Upgrading of a Pseudodynamic Tests

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The present study is aimed at a developing of an upgrading pseododynamic testing system for steel structures. For this purpose, various discuss for improvement on the functional preservation of bridge structures are shown, based on analytical and experimental results.1) Seismic performance of inversed L shape steel bridge piersFor the specimen with stiffened cross section that modeled cantilever and inversed L shape bridge piers, by adding repetition horizontal displacement in the condition that the fixed vertical load that corresponds to the superstructure weight was added in the top of bridge pier, the Pseudodynamic tests were carried out. Seismic performanuces (maximum and residual displacement) for inversed L shape bridge piers were clarified.2) Seismic isolator bearingThe introduction of the seismic isolation bearing which was one of the methods for reducing residual displacement of the bridge pier after the earthquake end in high ductility steel bridge piers that have high earthquake performance was examined.3) Upgrading pseudodynamic testing systemSub structure pseudodynamic testing system that is carried out by separating the steel bridge piers with the seismic isolation bearings from the main part material and sub member is proposed. The responses of the main member are obtained experimentally and the other responses are solved numerically. The verification of that experiment system is discussed by numerical study for whole parts.