Research And Development Of Prestress-strengthened Anchor Of Carbon Fiber Reinforced Plastics Plate And Test Platform

FRP (Fiber Reinforced Plastics, FRP) reinforcement technology is a relatively hot research in civil engineering field, in which CFRP (Carbon Fiber Reinforced Plastics, CFRP) reinforcement technology is most widely applied. Compared with other reinforcement methods, prestressed CFRP plate reinforcement has significant advantage. However, a good anchorage of CFRP plate is a prerequisite for prestressing. So it is necessary to research the anchor. At present, there are many forms of anchors, in which carbon fiber tendons anchors take up a great proportion. Because of carbon fiber plate reinforcement technology has less experience than carbon fiber tendons, the anchor style is relatively few. In this paper, based on the clip-type anchors, author developed a new type of arc-shaped clip anchor, analyzed it by the finite element software, designed a CFRP plate anchor performance test platform, and carried out comparing test research between arc-shaped anchor and plane anchor. The main contents include the following:(1) Author designed an arc-shaped clip anchor, and the advantages of this anchor is maximized to eliminate eccentric force influence on the ultimate strength of CFRP plate, and carried out the structural design. Meanwhile, according to the three stages, including preload phase, unloading stage, tension stage, author carried out force analysis, and got the value ranges of anchor plate angle and reasonable value of preload. Finally, through analyzing the stress of the anchor plate, width ranges of anchor plate were obtained.(2) Anchor and CFRP plate were analyzed by using the finite element software through the parametric modeling method, and established nonlinear finite element model. The old modeling method which only has one contact surface between the clip and the anchor plate was changed. In this model, two contact surfaces were established, one is between the clip and the anchor plate, the other is between the clip and the CFRP plate. Taking the multiple sets of comparison method, a set of optimal design parameters was determined, through the comparison of stress of CFRP plate under different control parameters.(3) Designed a type of tension device that applied to the performance test of CFRP plates. And contrast test for two kinds of tension device is carried out. The result indicates the tension device that designed in this paper has a larger advantage which is relatively lighter weight, easy to assemble, easy to operate, strong practicability and has stable test data. (4) According to the above design, machining the anchor and carried out the anchoring performance static load test. In the same time, the anchoring efficiency modulus of anchor and failure mode and the comparative analysis of CFRP plate uneven stress test were carried out. The test result was up to expectations. The anchoring efficiency modulus of designed anchor was higher and failure mode of CFRP plate was reasonable, which indicated anchoring performance is reliable.