Research On Hinge-type Anchor Tensioning Of Prestressed FRP Sheets Technique

Prestressed CFRP reinforcing technology is a very promising technology, as well ascurrent research on reinforcing technology of hot spots. At present, the two technicalproblems still exist, one being clamp and anchorage of FRP sheets, that has created th-e practicality of the stretching process. Waveform teeth clamp bolt (hereinafter referre-d to as wavy anchor) invention solved the problem of clamping and anchorage of FRP sheets But how are tensioned FRP sheets to give full play to its strength was needed to address the problem. Based on the waveform anchor design flat-anchor and rubbing anchored two stretching process, and have done a lot of carbon FRP sheets tension experiment, get the following research results.Plain end and hinged anchors are two anchors of the wave form. This article withflat-end bolt and hinge-bolt-tensioning of prestressed FRP sheets technique for the following theoretical and experimental research, main content and outcomes are as follows:1, From the perspective of tensioning force of, factors affecting the strength of FRP sheetsis the result of multiple factors. On carbon f FRP sheets resulting in uneven stress of CFRPmain parallel errors, reversing the eccentric error, error, curvature, and so on.2, Tensioning of prestressed FRP sheets technique using Sika company, this team-endexperimental study on bolt tensioning prestressed FRP sheets technique. Experimental studiesshow: there are no strict process control, flat-end bolt tensioning technology should not beused for tensioning of prestressed carbon fiber plate. Shall be carried out on flat-side bolttensioning technology optimization and improvement.3, As possible in order to make FRP sheets centre line consistent with the geometric centerof the force, set at the FRP sheets anchor clamps at both ends two hinges, the hinge is free torotate and slide, FRP sheets is automatically after finding the best focal point, ensure uniformstress of carbon fiber panels. Hinge type anchor tension technology is improved Hou of flatend anchor tension technology, continues to on hinge type anchor tension technology forexperimental research, experimental research found: hinge type anchor for due to nut loose(participation by force screw Rod length changes) caused of FRP sheets eccentric by pull hasmust of regulation role, is Dang FRP sheets exists must degree of initial installed errors fortension, hinge type anchor tension technology by itself of regulation role, makes FRP sheetsGeneral is Center by pull.4Flat-end of bolt tensioning technology and hinge bolt tensioning technology experimental study on the basis of the data, two tensioning technology is used in the comparison. Mainlyfrom the load and static load failure types, comparison of tensile strength, eccentric tensionareas such as comparative analysis of the results. Analysis shows: hinge-bolt tensioningtechnology in the above aspects are much better than the plain end bolt tensioning technology.Prestressed FRP sheets plate-hinge bolt tensioning technology applied to high speed mixertap ditch bridge strengthening works of Gansu province. Project practice shows that the hingebolt tensioned FRP sheets process is simple, fast, and easy to achieve the rapid reinforcementof bridge without disrupting traffic.