Development of Finished Fiber-Optic Grating Type Steel Strand Ties
Since cables are the main load-bearing member of cable structures,it is important to assess their service condition,using data from sensors,to ensure the long-term safe operation of the structures.To improve the survival rate of fiber grating sensors and investigate the effect of embedded sensors on the load-bearing performance of finished ties,five sensors are embedded in the center wire groove of each strand.Moreover,the fiber-optic harness is led through the end plug drilling.Three fiber-optic grating type strand specimens are prepared in order to conduct a static load tensioning experiment.The test results show that the sensor survival rate during tensioning is 100%,the cable force monitoring range is up to 80%of the breaking load,and the cable anchoring efficiency factor is more than 97%.By embedding the fiber grating sensor in the center wire and leading it out through the drilling method,the survival rate of the sensor is ensured and reliable monitoring of the axial stress of the cable is achieved.The average load capacity of the finished cable is 821 kN.The finished cable with the sensor embedded in the slot of the center wire of the strand maintains a good load-bearing performance and meets the requirements for engineering applications.
optical fiber grating sensorsteel stranded wire tiesanchor structurestatic load test
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