매립 FBG 센서를 이용한 긴장력 도입 합성 강절교량의 시공 단계별 거동분석

초록

The key of the steel/concrete composite rigid frame bridge is to ensure the moment distribution in longitudinal direction. In order to verify the moment distribution at every construction stages, a prototype composite rigid frame bridge was designed, constructed, and tested in the structural laboratory. Multiplexed fiber Bragg grating (FBG) sensors are embedded in the rigid frame bridge. Four FBG sensors are multiplexed in single optical fiber and installed in parallel pairs along the length of the steel beam, with one set at the top flange and the other at the bottom flange. The strains are directly measured from multiplexed FBG sensors at various locations followed by curvature calculations based on the plane section assumption. Curvature distribution is then monitored in three construction stages