Aluminum Alloy Plate-concrete Interface Based On Double Shear Test Bond Slip Test And Constitutive Curve Study

Aluminum alloy plate has the advantages of light weight and high strength,corrosion resistance and good extensibility.It is an ideal material for strengthening concrete structure in complex and harsh environment,but the bond property between aluminum alloy plate and concrete is the key to affect the cooperative force of two different materials.Therefore,on the basis of the existing research,the effects of bond length of aluminum alloy plate,bond thickness of aluminum alloy plate and the type of structural adhesive on the interfacial bond properties are comprehensively analyzed in this paper.the main results are as follows:In order to ensure the pure shear state of the specimen,the following key processes have been adopted in the manufacture of the specimen: grinding the concrete surface;using positioning mould and foam tape to locate the aluminum alloy plate;designing a double shear test device based on manual jacking;the test device has set up rotating upper and lower hemispherical hinges,which reduces the tensile eccentricity of the specimen and ensures that the aluminum alloy is in a pure shear state.The failure tests of 48 aluminum alloy-concrete double shear specimens were completed.The effects of bond length of aluminum alloy plate,bond thickness of aluminum alloy plate and type of structural adhesive on the interfacial bond failure mechanism,failure mode and interfacial peeling bearing capacity were analyzed.The strain distribution along the bond length direction,the evolution law of bond shear stress and the load-slip evolution law at the loading end were obtained.Based on the strain test results,the standardized bond slip dispersion diagram of aluminum alloy concrete interface is obtained by integral method,and the differences between bilinear model,hyperbolic model,Nakaba model and standardized aluminum alloy concrete interface bond slip dispersion diagram are compared and analyzed.the results show that the Nakaba model is in good agreement with the experimental results in the rising section of the curve.The bond slip dispersion points obtained from the test are uniformly distributed on both sides of the curve,but there is a certain degree of deviation in the descending section of the curve.Based on the analysis of the stress balance equation of aluminum alloy plate element and the introduction of four basic assumptions,the aluminum alloy concrete boundary is established.The surface elastic mechanics model lays a foundation for the further development of aluminum alloy slabs to strengthen concrete structures.