Beam tester of bonding strength of fibre reinforced composite sheet and concrete

Abstract

The invention relates to a beam tester of the bonding strength of fibre reinforced composite sheet and concrete. The tester comprises a front compression bar altitude controller, a back compression bar altitude controller, a compression bar, a distributive girder and a steel girder, wherein the distributive girder is arranged above the steel girder, the front and back compression bar altitude controllers are arranged on the sides of the steel girder, the steel girder is connected with a pair of hinge parts, each hinge part is provided with an hinge hole, the inside of the hinge hole is provided with a hinge bar; the front and back compression bar altitude controllers adopt the altitude controllers, each altitude controller contains a base provided with connection holes and a compression bar hole; the inside of each connection hole is provided with a connection bolt, the base is also provided with an upper support and a lower support, a compression bolt is arranged in the upper support, an adjusting bolt is arranged in the lower support; the compression bar hole is arranged between the upper support and the lower support, the compression bar is inserted in the compression bar holes of the front and back compression bar altitude controllers and arranged between the compression bolt and the adjusting bolt, and the front and back compression bar altitude controllers and the pair of hinge parts are arranged on the same side of the steel girder.

Description

technical field [0001] The invention relates to a test device for testing the bonding performance of fiber-reinforced composite sheets and concrete, which belongs to the material performance testing technology. Mainly used in construction, bridges, water conservancy and transportation and other fields. Background technique [0002] FRP (Fiber Reinforced Plastic) composite materials have the advantages of high strength, light weight, corrosion resistance, fatigue resistance and convenient construction, and have been widely used in the field of civil engineering. FRP composite materials can be used to strengthen the concrete structure for bending resistance, shear bearing capacity and earthquake resistance. One of the main determinants of the reinforcement effect is the bonding performance between FRP and concrete. Experimental studies have found that FRP peeling failure is a common failure mode in FRP-strengthened concrete beams, but the causes of FRP peeling damage are diff...

AI Technical Summary

Problems solved by technology

It is difficult to accurately simulate the fracture mode of FRP and concrete in the mixed mode fracture mode and the peeling failure process under cyclic loading by traditional single shear or double shear test.

The main reasons are: (1) When simulating the peeling failure of FRP and concrete under the mixed mode, it is difficult to set the offset of the FRP sheet in the single shear or double shear test; (2) the single shear or double shear test When testing the bonding performance between FRP and concrete under cyclic load or static load, the tensile end of the FRP sheet is prone to slipping at the hydraulic chuck, resulting in test failure

[0005] The above shortcomings seriously limit the wide application of single shear or double shear test in FRP and concrete bond performance test

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