이 연구에서는 현장타설 캔틸레버공법(free cantilever method)을 적용한 PSC(prestressed concrete) 교량에 콘크리트의 장기거동을 고려한 시공 중 계측분석 방법을 제안하였다. 콘크리트 박스 거더의 장기 거동에 따른 응력을 확인하기 위해 온도센서와 변형률계를 함께 설치하고 계측된 데이터를 이용하여 크리프계수를 산출하였다. 또한 크리프계수를 적용한 콘크리트 박스 거더의 시공 중 응력을 분석하고 설치된 온도 센서의 변화 데이터를 비교하여 세그먼트 시공에 따른 연직변위를 분석하였다. 연구결과, 교량의 장기 거동을 고려한 FCM 교량의 시공 중 계측은 레이저 변위계나 처짐계를 사용하지 않고 온도와 변위 데이터만을 이용하여 효율적인 분석이 가능한 것으로 나타났다.

This study is a part of the research on the development of safety monitoring system and monitoring program of 3MW offshore wind support structure using fiber optic sensor. In this paper, we propose a maintenance system for offshore wind support structure using fiber optic sensor based on the analysis of current monitoring status and related standards of domestic and overseas offshore wind support jacket structures.

This study is a part of the research on the development of safety monitoring system and monitoring program of 3MW offshore wind support structure using fiber optic sensor. In this paper, we propose a maintenance system for offshore wind support structure using fiber optic sensor based on the analysis of current monitoring status and related standards of domestic and overseas offshore wind support jacket structures.

Recently, as a number of long span bridges are constructed, the various studies have been focused on bridge health monitoring system (BHMS). Also, Global Navigation Satellite System (GNSS) is being spotlighted as new concept sensor for BHMS because of its unique advantages. However, GNSS installed for bridge monitoring has been used so far only in measurement of bridge displacement. Therefore, in this study, the dynamic characteristic analysis of bridge using GNSS data collected in bridge was conducted, through which is to increase the utilization of GNSS for bridge health monitoring system (BHMS).

The sensors currently installed for bridge monitoring are faced with limitations in terms of the application and effectiveness of such systems in current long sized bridges, which are developing rapidly in terms of both size and function. Global Navigation Satellite System (GNSS) has been noted as an only way to overcome the limitations of such sensors. This is because they have numerous desirable characteristics that outweigh their high cost. However, GNSS installed for bridge monitoring has been used so far only in measurement of bridge displacement. Therefore, in this study, verify the usability of GNSS through correlation analysis between deflection and temperature

It is well known that multipath disturbance is one of the major error sources impacting high precision GPS positioning. Even though most of the other error sources have been dealt with by modeling or using special practical techniques, multipath disturbance is still the limiting factor of all precise differential carrier-phase applications. Wavelet decomposition techniques proved to be a powerful tool in mitigation as introduced by various researchers. This paper presents a new trend extraction technique for multipath mitigation in carrier phase measurements domain using wavelet multi-resolution analysis.