Beam test device for bonding strength between fiber reinforced composite bars and concrete

Abstract

The invention discloses a girder type test device for bonding intensity between a fiber-enhanced composite rib material and concrete. The girder type test device is used for testing performances of an FRP-concrete test piece, wherein an FRP rib is buried in the FRP-concrete test piece. The girder type test device comprises a first steel girder, a second steel girder, a distribution girder and a press plate, wherein the upper parts of the two ends of the first steel girder and the second steel girder are hinged to each other by a steel bar articulated element, and simultaneously, the lower parts of the first steel girder and the second steel girder are fixedly connected by a fixing steel plate; the distribution girder is arranged above the first steel girder and the second girder, and a central axis passes through a hinged point; two pressure plates are arranged on the lower of the second steel girder; and the FRP-concrete test piece is arranged in the first steel girder, and the FRP rib passes through the hinged end of the first steel girder, and extends between the two pressure plates for fixing. The device can eliminate geometric eccentricity of a preliminary test, guarantees that applied pulling force is an axle center stretching load, and raises test accuracy.

Description

technical field [0001] The invention belongs to the technical field of material performance testing in the fields of buildings, bridges, water cooling, transportation and the like, and in particular relates to a test device for the bonding performance of fiber-reinforced composite bars and concrete. Background technique [0002] FRP is a new type of fiber composite material, which has the advantages of high strength, light weight, corrosion resistance, fatigue resistance and convenient construction, and has been widely used in the field of civil engineering. Replacing steel bars in reinforced concrete structures with FRP bars will greatly improve the service performance and durability of concrete structures, prolong the service life of concrete structures, and reduce building structure costs and maintenance costs. Using FRP bars instead of steel bars, under the action of external load, the key factor affecting the co-operation and coordinated deformation between FRP bars and...

AI Technical Summary

Problems solved by technology

At the same time, the elastic modulus of FRP is small, about 25%-70% of ordinary steel bars, and the shear and extrusion strengths are low. During the pull-out test, the FRP bars are easy to be pinched when the ultimate tensile stress is reached.

[0004] It can be seen from the above that in the study of the bonding performance of FRP bars and concrete, there are many practical problems mentioned above in the pull-out test, which hinder the bonding performance of FRP bars and concrete Research

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