THE ANALYSIS OF END STRESS OF PRESTRESSED FRP WITHOUT ANCHORAGE$
无锚固条件下预应力FRP端部应力分析

If there is usually no anchor measure in the end, the prestressed level provided by the usage of prestressed FRP reinforcement is limited and does not reach the desired results. While relying entirely on the permanent mechanical anchorage, the high cost of anchoring fixture is not beneficial to the widespread application of prestressed FRP reinforcement technology. Through the analysis of stress state of the end after release of prestressed FRP, it is found that the appropriate increase of the thickness of cohesive layer and the improvement of its deformation performance can increase substantially the end bonding ability to satisfy the needs of prestressed reinforcement. The additional simple anchorage measures can further improve the capacity and reliability of anchorage. This analysis provides a theoretical basis for the prestressed FRP reinforcement technology to reduce the cost and to simplify the construction process.