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为了锚固碳纤维增强复合材料(CFRP)筋材,并将其应用于实桥中,提出了一种黏结型锚具,首先采用有限元法分析该锚具的受力性能,再采用试验方法研究该锚具锚固单根CFRP筋的锚固性能;然后利用该锚具制作了5束大吨位试验索,并测试其极限承载力,同时研究黏结型锚具的黏结强度、锚具效率系数、持荷效应等;最后将该黏结型锚具应用于试验桥中。研究结果表明:平均黏结应力随黏结长度的增大而减小,但是锚具的极限承载力提高;锚具的效率系数达到93%以上,满足试验桥设计要求;树脂灌注型锚具的大部分蠕变变形在加载后较短的时间内发生;试验桥拉索测试时各根筋材受力均匀性较好,且持荷一定时间后测试的应力下降较小。
In order to anchor the carbon fiber reinforced composite (CFRP) bars and apply them to the real bridge, a bond type anchorage was proposed. First, the force behavior of the anchorage was analyzed by finite element method Anchorage performance of anchoring single CFRP tendons. Then, five large tonnage test cables were made with the anchorage and their ultimate bearing capacity was tested. At the same time, the bond strength, anchor efficiency coefficient, holding load effect Etc .; Finally, the bond anchor applied to the test bridge. The results show that the average bond stress decreases with the increase of the bond length, but the ultimate bearing capacity of the anchor increases; the efficiency coefficient of the anchor reaches more than 93%, which meets the design requirements of the experimental bridge; the majority of resin infusion anchor Creep deformation occurs within a short time after loading. The stress uniformity of each root bar is good when the cable is tested in the test bridge, and the stress drop of the test is small after holding for a certain period of time.