无锚固条件下预应力FRP端部应力分析

THE ANALYSIS OF END STRESS OF PRESTRESSED FRP WITHOUT ANCHORAGE

  • 摘要: 通过对预应力FRP放张后端部应力状态的分析后发现,适当加大粘结层的厚度和提高粘结层的变形性能可大幅度提高端部粘结锚固的能力,满足预应力加固的需要. 附加的简易锚固措施可进一步提高锚固能力和可靠性. 分析为预应力FRP加固技术的成本降低和施工工艺简化提供理论依据.

     

    Abstract: If there is usually no anchor measure in the end, theprestressed level provided by the usage of prestressed FRP reinforcement islimited and does not reach the desired results. While relying entirely onthe permanent mechanical anchorage, the high cost of anchoring fixture isnot beneficial to the widespread application of prestressed FRPreinforcement technology. Through the analysis of stress state of theend after release of prestressed FRP, it is found that the appropriateincrease of the thickness of cohesive layer and the improvement of itsdeformation performance can increase substantially the end bonding abilityto satisfy the needs of prestressed reinforcement. The additional simpleanchorage measures can further improve the capacity and reliability ofanchorage. This analysis provides a theoretical basis for the prestressed FRP reinforcementtechnology to reduce the cost and to simplify the construction process.

     

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