철도교량의 구조건전성 모니터링 시스템 개발

Recently a challenging project has been carried out to construct a nationwide network for safety management and monitoring of civil infrastructures in Korea. As a part of this project, structural health monitoring (SHM) systems have been implemented on railroad bridges using various types of sensors such as accelerometers, optical fiber sensors (OFS), and piezoelectric sensors (PZT). This paper presents the current status of the SHM systems on the railroad bridge testbeds. Emerging sensors and monitoring technologies have been utilized. They are local damage detection using PZT-based electro-mechanical impedances and OFS-based dynamic strains, global response monitoring using accelerations and wireless sensor data acquisition systems. The monitoring systems provide real-time responses under train-transit and environmental loadings, and can be remotely accessible and controllable through the commercial internet service. The guideline of safety management has been established by investigating the long-term behaviors of the railroad bridge testbeds together with numerical simulation results.