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Behavior Character Analysis of Super Long Suspension Bridge using GNSS

GNSS를 활용한 초장대 현수교의 거동 특성 분석

Park, Je-Sung;Hong, Seunghwan;Kim, Mi-Kyeong;Kim, Tai-Hoon;Sohn, Hong-Gyoo
박제성;홍승환;김미경;김태훈;손홍규

  • Received : 2019.09.20
  • Accepted : 2019.10.16
  • Published : 2019.10.31

Abstract

Recently, the span length of long-span bridges is getting longer. As a result, it has been suggested that a new concept called 'super long-span bridge'. In case of super long span bridges, the structure is being complicated and the importance of structural stability is being emphasized. However, until recently, the most commonly used sensors (dual axis clinometer, anemometer, strain gauge, etc.) have got limit about the bridge monitoring. Consequently, we researched the application of a Global Navigation Satellite System (GNSS) to improve the limit of the existing sensors. In this study, the dual axis clinometer, the anemometer and the strain gauge together with the GNSS were used to analyze the behavior of a super-long suspension bridge. Also, we propose the detailed method of bridge monitoring using the GNSS. This study consisted of three steps. First step calculated the absolute coordinates of the towers and the longitudinal axis direction of the study bridge using the GNSS. In second step, through the analysis of the long-term behavior in shortly after construction, we calculated the permanent displacement and evaluated the stability of main towers. Third step analyzed the behavior of bridge by the wind direction and was numerically indicated. Consequently, the bridge measurement using the GNSS appeared that the acquired data is able to easy processing according to the analysis purpose. If we will use together the existing measurement sensors with the GNSS on the maintenance of the super long-span bridge, we figure each error of measurement data and improve the monitoring system through calibration. As a result, we acquire the accurate displacement of bridge and figure the behavior of bridge. Consequently, we identified that it is able to construct the effective monitoring system.

Keywords

Super long-span bridge;GNSS;Permanent displacement;Behavior;Stability

Acknowledgement

Grant : 재난원인 현장감식 기술개발

Supported by : 국립재난안전연구원