| Carbon Fiber Reinforced Polymer, abbreviated as CFRP,is coming to be a new kind of structural material in the architecture field with it's light weight,high strength and high wear. CFRP tendons are the substitute of the reinforced steel bars. The applications and researches about them are carried out all over the world. Aimed at the CFRP tendons anchoring problems, a kind of wedge anchorage for high-strength prestressing CFRP tendons is developed, and the numerical analysis on its anchoring capability is given as well as the main reasons impacting its anchoring capability.The main contents of this thesis are as follows:The characters and research status of CFRP tendons and their anchorages in and around the world are discussed and concluded.The wedge-sleeve anchorage for CFRP tendons is selected as the research object. The academic analysis about the processing that the anchor system grips the CFRP tendon is conducted. And the academic provements about intensity which the barrel endured are conducted.A fiducial finite element model of the wedge-sleeve anchorage for the high-strength prestressing CFRP tendons is designed elementarily in virtue of the technology of the finite element.Then the basic parameters constituting the anchor system are predigested reasonably. And the process the anchor system gripping the CFRP tendon is simulated. Great emphases are put on researching and studying the basic mechanics capability of the CFRP-tendon anchorage system in different thickness of the cupreous sleeve,different friction coefficient, different jam-packed pressure, different length of anchor system and different angles of the barrel and wedge.The analysis indicates: In order to avoid slip of the CFRP tendon, the friction angle between soft metal sleeve and the CFRP tendon should be larger than the sum of barrel's conical angle and friction angle between wedge and barrel. The difference between the average tension of barrel in circumferential direction and the average compression stress of barrel should be less than the yield strength of barrel. When the conical angle of barrel changes between 1.79°and 2.19°, the larger the conical angle of barrel is, the smaller the contact stress of the CFRP tendon is. At the same time its anchoring capability goes down with it.If the conical angle difference is increased, the effective anchorage length will be minished and the contact stress of the CFRP tendon will be increased accordingly. It's more advantageous to the CFRP tendon if the anchorage length is longer or the thickness of the cupreous sleeve is more appropriate. The prestressing load has something to do with the displacement of CFRP tendon. |
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