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Dynamic Performance Evaluation of New Type PSC Railroad Bridges  

Choi, Sanghyun (한국철도대학 철도시설토목과)
Publication Information
Journal of the Society of Disaster Information / v.7, no.4, 2011 , pp. 259-265 More about this Journal
Abstract
After the commercial opening of the KTX in 2005, the high speed railroad has been rapidly emerged as the major transportation means due to its high energy efficiency. Recently, the government has announced its plan to build the future transportation system around the high speed railroad. Based on this policy, the existing lines as well as the lines under construction or design are planning to increase design speed. In this paper, the suitability of the mid-span PSC girder bridges for the high speed railroad is evaluated via dynamic analysis. IT, Precom, and WPC girder bridges are considered for the purpose of this study and, for comparison, the identical modeling method and the analysis technique are utilized. The performance indices used for dynamic performance evaluation are the natural frequency, the vertical displacement, the end axial displacement, track irregularity, etc. The KTX train is utilized as a dynamic load, and the dynamic analysis is performed up to the train speed of 420km/hr with the increment of 10km/hr.
Keywords
PSC Girder; Dynamic Safety; IT; Precom; WPC;
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