Abstract
This paper presents a multi-functional strand capable of introducing prestressing force in prestressed concrete (PSC) girders and sensing their static and dynamic behavior as well. This innovative strand is developed by replacing the core steel wire of the strand used in PSC structures with a carbon fiber-reinforced polymer (CFRP) wire with a built-in optical Fiber Bragg Grating (FBG) sensor. A full-scale girder specimen was fabricated by applying this multi-function strand to check the possibility of tracking the change of prestressing force at each construction stage. Moreover, dynamic data could be secured during dynamic loading tests without installing accelerometers and made it possible to obtain the natural frequencies of the structure. The results verified the capability to effectively manage the prestressing force in the PSC bridge structure by applying the PC strand with a built-in optical sensor known for its outstanding practicability and durability.
Highlights
prestressed concrete (PC) Strand with Built-in Optical SensorThe tendon is a critical member introducing prestressing force in concrete structures to improve its deflection and crack characteristics
This result indicates that the Fiber Bragg Grating (FBG) sensor embedded in the optical sensor PC (OSPC) strand that both wasofarranged transversally in the bridge accurately measure the acceleration of thestrand types data
The present study developed a OSPC strand, a strand incorporating an optical sensor as a core wire, enabling the effective management of the prestressing force in prestressed concrete (PSC) structures
Summary
The tendon is a critical member introducing prestressing force in concrete structures to improve its deflection and crack characteristics. The prestressing force in PSC structures experience changes due to diverse causes. Research on sensor-type PC strands is being led in numerous countries to overcome such problems and achieve a strand that can play the role of sensor, apart from its natural application as a member introducing prestressing force in the structure [3,4,5].
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