Research On Flexural Capacity Of Aluminum Alloy-Concrete Composite Beam

Aluminum alloy profiles have the advantages of light weight,easy machining and non-magnetic,indicating that aluminum alloy materials have a good application prospect in the field of engineering structure,compared with steel structure,these advantages can be widely used in national defense projects.The aluminum alloy-concrete composite beam is a new type of composite structure.The study shows that the aluminum alloy-concrete composite structure has good application potential.However,there are few researches on the flexural performance of aluminum alloy and concrete composite beams at home and abroad,and the related specifications are not perfect,which hinders its development.Therefore,with the increasing application of aluminum alloy structure in civil engineering and other fields,it is of great significance to study the flexural properties of aluminum alloy and concrete composite beams.In this paper,by means of experimental research,numerical simulation and theoretical calculation,the finite element analysis of different parameters affecting the flexural capacity of aluminum alloy and concrete is carried out,and the calculation formula of flexural capacity of composite beams is derived,and the theoretical value is compared with the analytical value,work out its proposed calculation method,etc.The main research contents are as follows:（1）The 6061-T6 aluminum alloy standard specimen tensile test,extract and analyze the data to obtain the mechanical parameters and stress-strain curve of 6061-T6 aluminum alloy material,calculate the strain hardening parameter n is 26,and obtain the material constitutive relationship according to the Ramberg-Osgood model;The experimental research results of aluminum alloy and concrete composite beams are verified by finite element model,and the error of ultimate bending capacity is 6.8%,which is consistent with the experimental results.（2）Based on the tensile test data of 6061-T6 aluminum alloy standard specimen and the modeling method of model verification,finite element analysis software is used to conduct finite element modeling of the aluminum alloy and concrete composite beam to be studied in this paper.Through calculation,29 bolts are arranged across the whole span with a spacing of160 mm.According to the stress cloud diagram,the maximum stress of aluminum alloy is380.7 MPa,the maximum stress of concrete is 60.3 MPa,and both materials have reached the yield.（3）Respectively using finite element analysis software for composite beams of different web plate thickness and aspect ratio,concrete strength grade,stud spacing and location,and in the aluminum alloy configuration between concrete and reinforcing steel bar in finite element modeling,finite element analysis and extract the ultimate flexural bearing capacity under the influence of different parameters analysis values,analysis shows that changing the parameters of composite beams of different influence.The ultimate bending capacity of composite beams is affected in different degrees.（4）In order to obtain the calculation formula of the flexural bearing capacity of the H-shaped aluminum alloy-concrete composite beam,the formula is derived according to the two calculation methods of complete shear connection and partial shear connection.According to the stress distribution of each part of the composite beam,the force analysis is carried out,the mechanical balance equation of the composite beam is established,and the calculation formula of the flexural bearing capacity of the composite beam is obtained;the different influencing parameters are substituted into the proposed calculation formula,and the ratio of the theoretical value to the analytical value is obtained to be between 0.97-0.98,so as to verify the correctness of the proposed formula proposed in the paper;finally,the proposed calculation method and application range of aluminum alloy-concrete composite beams are proposed.