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Abstract The durability problem of anchor rods used to reinforce slopes can be solved by substituting fiber reinforced polymer(FRP) bars for steel bars. The FRP bars have small elastic moduli，and therefore should be prestressed in order to limit the deformation of the reinforced slope during its service stage. This paper described the grating sensing technology to be applied to monitor the bond behavior of sand-coated GFRP anchor rod under cyclic prestressing. The results showed that prestressing of the sand-coated GFRP anchor rod led to the damage of rod-mortar interface bonding of the anchor. The effect of repeated load on the bonding was negligible and the effect of the surcharge load was significant. The damage to the bonding of rod-mortar interface of the anchor is dependent only on the surcharge load，and not on the service load. The shear force of the anchor rod is provided by the bonding force and friction；with the bonding force generated at the initial stage，and then changed into friction at the later stage. The excessive peak loading leads to the damage to the bonding and the loosening of the anchor structure. The over tension load of the prestressed anchor rod structure must exceed the service load to an extent in order to ensure a stable anchorage force in the service stage.
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Received: 21 October 2013
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2014, Vol. 33 
