| Application of carbon fiber reinforced polymer plate for structural reinforcement is a new novel type of reinforcement method.Compared with other traditional strengthening methods, this method has the advantages of light weight, high strength, convenient construction and good effect of repair reinforcement. However, through a large number emerging evidences of engineering practice and in-depth theoretical studies, suggest that there are several problems in the ordinary paste way: firstly, material strength utilization rate of CFRP is too low, can’t play its high strength performance; furthermore, the interface of CFRP and concrete interface is easily stripped; moreover, due to the stress hysteresis, the CFRP plate would function effectively only after further deformation occurs on the reinforced component induced by secondary loading, the CFRP plate come into effect gradually. Prestressed CFRP plate can not only solve the above problems,to give full play to the high performance of CFRP plate,but also can improve the bearing capacity and the normal workoing condition performance of the reinforced component. Our research team has done a large number of experimental studies and theoretical analysis on prestressed carbon fiber plate anchorage system. Previously, we excogitated prestressed CFRP plate anchorage, fixture and a set of anchor tension system.Based on our previous study, This paper, on the basis of our previous study, the main purpose of this paper is to improve the workmanship of the prestressed CFRP plate anchor, the main research content is as follows:(1) The effect of the different interface friction coefficient on the mechanical properties and the slip influence of the anchorage inside colloid and carbon fiber plate was analyzed by ABAQUS finite element analysis software, using simulating perfusion-type cylindrical wedge anchor limit anchoring force test. The analysis results showed that, increasing friction coefficient of the anchor cup—epoxy interface can would help ease attenuate the internal pressure stress concentration of epoxy and reduce slippage of CFRP plate and epoxy,which laid the theoretical basis of anchorage wormanship improved;(2) Our research team designed a set of friction test device based on the characteristics of perfusion-type cylindrical wedge anchor, our research team designs a set of friction test device, which explored the interface friction coefficient of epoxy-steel interface added to various materials on the interface. And we found a kind of material applied to anchor anchorage cup- epoxy,which can increase interface friction coefficient from 0.25 to 0.34, applied to anchorage cup- epoxy interface.(3) According to the friction test results and considering the characteristics of perfusion-type cylindrical wedge anchor, we invented a prefabricated interface material that can apply to the anchor. The limited force and the load-slip curve of anchorage were examined through the anchorage limited force test. The test results indicated that, the limited anchoring force of the improved anchorage can achieve 192 kN, converted to CFRP plate stress for 2743 MPa. According to the test results,we can see that the material strength utilization rate of CFRP is high, and the method of improving interface friction coefficient is useful.The innovations of this paper mainly reflects in:(1) The mechanism of the perfusion-type cylindrical wedge anchor was analyzed and we put forward the idea that the performance of anchorage can be improved by increasing the interface friction coefficient of anchor cup- epoxy interface.(2) We designed a friction test device,based on the characteristics of perfusion-type cylindrical wedge anchor interface,to inquiry the practical methods of how to improve the interface friction coefficient of anchorage for.(3) We developed a novel prefabricated interface material to improve the workmanship of anchorage. |
PDF Full Text Request