Since several years glassfiber reinforced plastic (FRP)-bars are widely used as prestressing strands in bridge constructions. In those constructions the prestressing forces are normally transferred into the anchorage material by bond. The bond behavior of glassfiber strands surrounded with an epoxy-based coating has been investigated under short term, reversed and cyclic loading up to one million load cycles. The bond slip-behavior and the relation between slip and the number of load cycles has been studied and has been compared with results of FRP-rods which did not have a protection sheet around the bar. It was found that the above mentioned protecting system guarantees that no damaging abrasive slip (which leads to a reduction of the failure load) occurs.
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