SEISMIC RESPONSE ANALYSIS AND VIBRATION CONTROL BY TUNED MASS DAMPER OF OVERHEAD CATENARY SYSTEM POLES ON SHINKANSEN VIADUCTS

Abstract

 In the Great East Japan Earthquake, the high speed train (Shinkansen) operation system had stopped for long time, because a large number of overhead catenary system poles (OCS-poles) of pre-stressed concrete on Shinkansen viaducts had fell down even though the viaducts were not severely damaged. Thus, the seismic performance of the OCS-poles should be clarified and improved shortly by realistic techniques. In this study, firstly building a three-dimensional coupled frame model of four-block Shinkansen viaducts including OCS-poles and catenary cables, seismic response analysis was conducted and the dynamic response properties of the viaducuts and OCS-poles have clarified. Secondly, based on those results, a vibration control technique using TMD to ease damage of OCS-poles was proposed. Finally, conducting some simulations and referring to various material on TMD, the advantage of the proposed technique to the conventional ones improving seismic performance of OCS-poles in terms of function, cost, workability and maintenance was shown.