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Numerical Model Updating Based on Univariate Search Method for High Speed Railway Bridges

단변분 탐색법에 기초한 고속철도교량의 수치해석 모델 개선

  • 박동욱 (부산대학교 지진방재연구센터) ;
  • 김남식 (부산대학교 사회환경시스템공학부) ;
  • 김성일 (한국철도기술연구원 첨단인프라연구단 TFT)
  • Received : 2013.04.16
  • Accepted : 2013.10.08
  • Published : 2014.02.01

Abstract

Numerical model became one of most important tools for identifying the state of an existing structure in accordance with development of numerical analysis techniques. A numerical model should be updated based on the measured responses from the existing structure to accurately use the model for identifying the state of the bridge and executing numerical experiments. In this study, a new model updating method based on repetition method without a differential function is introduced and applicability for high speed railway bridge is verified with dynamic stability analysis. A fine measurement based on measurement points roaming method was executed with an wireless measurement system for precise dynamic characteristic analysis. The natural frequencies and mode shapes were estimated by correlation analysis and a mode decomposition technique. An initial numerical model was constructed based on design drawings and the model have been updated in accordance with the introduced model updating method. The results from numerical experiment and field test have been compared for verifying the applicability of the model updating method. And the dynamic stability analysis has been executed to verify the usability of the updated numerical model and the model updating method. It seems that the model updating method can be used for various bridges after evaluation of applicability for other type bridges in further studies.

Acknowledgement

Grant : 400 km/h급 고 속철도 인프라 시범적용 기술개발

Supported by : 국토해양부

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