TIE BAR EXTENSION FORCE ON LINE MONITORING BY OPTICAL FIBER BRAGG GRATING STRAIN SENSORS

摘要

In this paper, a tie bar extension force on line monitoring system in tied-arch bridge was presented, which the optical fiber Bragg grating strain sensors were embedded in tied-arch bridge for on line monitoring of internal force state changes. The relation between the tie bar extension force measured by optical fiber Bragg grating strain sensors and the internal state of tied-arch bridge under the actions of loading and temperature were discussed. The results showed that the embedded optical fiber Bragg grating strain sensors can display the internal force state of tie bar bridge, and as a powerful and sensitive assistant, which was convenient and beneficial to engineers to make a great variety of options to avoid disaster.