Measurement by laser bridge deformation tester in static/dynamic test of the full size PSC girder for HSR-bridge

초록

. The dynamic interaction between a bridge super structure and a passing train is one of the critical issues in High-Speed-Rail(HSR). Because it has been believed that the beam type girder has some troubles in the dynamic behavior, it has been restricted to apply to especially high-speed railway bridge in Korea. The PSC(Pre-stressed concrete) beam girder is widely used for the upper structure of various bridges except for the HSR bridges. The beam type girder is reconsidering to reduce the construction cost of the HSR line. In this paper, a full scale PSC girder of 40 meters long as a test specimen is fabricated and modal testing on it is carried out to evaluate the modal parameters, including the natural frequency and the modal damping ratio. Young’s modulus is also obtained from global stiffness of the test specimen. The laser deformation tester is used to measure the dynamic displacement and the acceleration on the test specimen. The measurements are compared with those by the traditional LVDT and accelerometer.