Anchoring Performance Comparison Study Of Two Carbon Fiber Anchor Fixtures

Carbon fiber reinforced plastics(Carbon Fiber Reinforced Plastics referred CFRP),with a lightweight, high strength, corrosion resistance, etc., at home and abroad in engineering structure reinforcement has been more widely used. Carbon fiber and CFRP structural reinforcement of the more commonly used, the amount is much larger than other types of fibrous material. Compared with carbon fiber, carbon fiber sheet with good quality and stable performance, convenient construction, etc., CFRP structural reinforcement is always required for the construction aspects of the impregnating resin,and resin impregnation method scene instability quality defects more The problem, so in prestressed CFRP reinforcement technology, the prestressed carbon fiber is the main object of study.Prestressed carbon fiber reinforcement technology, the anchor fixture reliability is the key merits of the technical performance or success. Reliable anchoring is a prerequisite for the ends of prestressed carbon fiber reinforcement methods, but also improve the utilization of carbon fiber sheet strength must first solve the problem.Unreliable anchor clamps inability to achieve a reliable carbon fiber clamp and anchor,prestressed tension level is very low, and the use of carbon fiber stress level is not easy to reach a higher level, or because the carbon fiber anchor jig leaving the carbon fiber slip occurred peel or a greater loss of prestress.Prestressed carbon fiber reinforcement technology development to the present, it has a variety of fixture types of anchors, but in our common bridge strengthening works mainly Wedge Clip Type Anchors(hereinafter referred to as the clip anchor), flat type anchor clamps(hereinafter referred to as Flat anchor), tooth waveform clamps anchor(hereinafter referred to as waveform anchor), which clip anchors and anchor waveform performance is relatively stable, this paper these two anchors fixture experimental study comparing the mechanical properties of the two anchor fixtures index test and compare the performance to find the two anchor fixture similarities and differences, to provide a basis for engineering applications and choose.In this article, refer to "tendons anchorage, clamps and connectors GB /T14370-2007" anchor fixture on the performance of traditional detection methods tendons, specially designed waveform anchor- carbon fiber assemblies, clip anchor-Carbon fiber assembly of the measured data were static breaking test, anchor for two different forms of performance comparison, the main results obtained are as follows:â‘  anchor clip from the design principle is a "widens tight" structure, in order to avoid excessive compressive stress(carbon fiber anti-extrusion capacity is weak), then clip design point should not be large, angle exists between the cup and the clip with the anchor poor, so in the "clip anchor- carbon fiber assembly" of static stretching, much larger than the measured slip "wave anchor- carbon fiber assemblies." The small amount of slip, prestressed tension control accuracy and control prestressing loss is more favorable.â‘¡ Based on the literature designed to clip anchor for low-strength carbon fiber to provide a better anchor, but the high-strength carbon fiber can not provide a reliable anchor.â‘¢ In the assembly breaking experiment, the two are quite different in the final fixture anchor failure modes of carbon fiber, the "wave anchor- carbon fiber assembly" in the carbon fiber can be a "hairline" breaking form no local or overall carbon fiber slip,and "clip anchor- carbon fiber assembly" is mainly localized slip and broken wires.