Study Of The Corrosion Law Of Prestressed Anchor Cables Based On Spiral Distributed Optical Fiber Sensor

Prestressed anchor cable is subject to corrosion under the harsh environment.The corrosion of anchor cable will shorten the service lifespan of the concrete structure,which is associated with serious potential safety trouble and huge economic loss come.Due to the characteristics of time randomness,space randomness,concealment of cable corrosion and the defectively common engineering monitoring methods,it is significantly difficult to realize the long-term and effective real-time monitoring of the corrosion of the anchor cable.Therefore,it is challengeable to study the corrosion law of prestressed anchor cables under the actual engineering environment.In this dissertation,the corrosion law of prestressed anchor cable based on spiral distributed fiber is studied and it is valuable for predicting lifespan of engineering structures,the main work consists of as follows:(1)Using simplified analysis model based on the concrete elasticity theory,a theoretical prediction model of corrosion rate based on spiral fiber sensor is studied and the influencing factors on spiral fiber strain are analyzed.(2)Uses electric accelerated corrosion method,the correctness of the theoretical prediction model based the helical fiber sensor was investigated.Moreover,the influence of effective length of steel bar and the thickness of concrete protective layer on t spiral fiber strain illustrated,and the corrosion law of reinforced concrete structure is illuminate here.(3)Based on the spiral distributed optical fiber test method,the corrosion model of prestressed anchor cable is established,and the corrosion law of prestressed anchor cable is studied.