Theoretical And Experimental Study On Failure Modes Of Reinforced Concrete Beams With Aluminum Alloy

With the emergence of new ideas, new materials, reinforcement technology also continued to emerge. Aluminum alloy 6061-T6 with high strength, low elastic modulus fully meets the ideal of reinforcement materials requirements. Therefore this paper try to introduce aluminum alloy to the field of structural strengthening, and apply for strengthening reinforced concrete beams.Aluminum alloy reinforced concrete structure is a new technology combination of reinforcement engineering and materials engineering, its reinforcement effect and the failure mode is to be verified by testing. For the purpose this paper design 24 beams with different section and different bond length ( there are 6 different sections according to section width and stiffening rib height) and 2 control beams .Through experimentation, summarize failure modes and analyze failure mechanism, and make a theory research on the failure modes.As a result of the consolidation of new materials and unique sections,in addition to the common failure models in the test, such as shear failure, plate end interfacial debonding, critical diagonal crack debonding,intermediate crack induced interfacial debonding,a new type of failure mode——plate-end bending-shear failure appeared in the experiment,and the failure mode has good ductility. Considering the failure model about the plate sections are too many and without any law, and plate-end bending-shear failure always appeared in the stiffener sections, so this paper make plate-end bending shear failure mode as the main research object, and make theoretical analysis and research on it.This article starting with through the interface shearing stress, through analysis I believe that plate-end bar yield due to plate end bending moment and interfacial shear stress in the plate end cracks,and thus established the failure criterion and calculation formula of plate-end bending- shear failure according to this. By comparison between theoretical values and experimental value, it indicates that the formula has a certain degree of reliability and practicality, and thus the formula can be used to predict bearing capacity of this class failure modes. The theory of this article can address any of the specified profile type, any specified bond length of flexural bearing capacity of reinforcement beam.Test results indicate that the aluminum alloy used for reinforcement of reinforced concrete beams achieved good results, and stiffener sections for inhibition of debonding failure have a very large role. The research finding on plate end bending-shear failure and calculation method of bearing capacity of aluminum alloy beams strengthened can provide reference for engineering practice.