Development of measuring data system of bridges by wirelesstransmission using fiber Bragg Grating sensor

摘要

A bridge, one of primary infrastructures in our society, can be damaged structurally from unexpected environmental changes such as earthquake, storm, or flood. Therefore, bridges have risks of collapse or decrease of life span. Recent researches on safety assessment for structures using fiber optic sensors and real-time measuring system are actively being done in order to obtain basic data of structural damages, degree of damages, and structural problems. At this point of time, this study is to recommend transmission of data measured with FBG(Fiber Bragg Grating) sensor by means of Bluetooth, the wireless communication system.rnIndoor and field experiments were performed to verify the reliance of data by wireless transmission. Indoor experiment was carried out with specimens of reinforced concrete beam, which contains FBG sensor, electric resistance sensor, and LVDT(Linear Variable Differential Transformer). With these specimens, the reliance of data by wireless transmission was verified by static and dynamic stress test. Moreover, field experiment was performed with prestressed concrete bridges for reliability of applying indoor experiment to the field. To make it same condition as indoor experiment, static and dynamic stress tests were done to specimens of reinforced concrete beam, which contained FBG sensor, electric resistance sensor, and LVDT, and this could verify the reliability of data by wireless transmission.rnIn conclusion, it is highly recommended to use Bluetooth, the wireless transmitting system, for transmission of measured data by FBG sensor, which is the safe and accurate measuring means. With all these means, maintenance and management of bridges will be possible without any limitation of time and place.