Study Of Interface Bonding Performance Between Shape Steel And Reactive Power Concrete(RPC) In Steel Reinforced Rpc Structures

Steel reinforced concrete structure is a structure which embedded shape steel and a few steel bar.Steel reinforced concrete structures have advantages like high capacity,outstanding anti-seismic performance and excellent durability.It is an excellent form of structure.Reactive Powder Concrete is a kind of cement-based composite material with ultra high strength,high durability,high toughness and good volume stability.It almost overcomes all the shortcomings of the concrete,such as: low tensile strength,small limit elongation,crisp.Excellent mechanical and durability make Reactive Powder Concrete has broad application prospects in civil engineering.If concrete replaced with Reactive Powder Concrete in steel reinforced concrete structure,upgrade to steel reinforced Reactive Powder Concrete structure,not only Inherits all the advantages of steel reinforced concrete structure faultlessly,but also narrows section size,improves the mechanical properties of components and increases the service life of the structure,to obtain good resources and allocate economic benefits.We can not apply or promote steel reinforced Reactive Powder Concrete structure without corresponding design theory and construction technology.As far as design theory,there is no unified design specification in China.Two of now used national norms respectively neglecting and simplifying the interfacial bonding of two materials.But Interfacial bonding properties between shape steel and Reactive Powder Concrete has a great impact on mechanical properties of composite structures.So,reveal the mechanism of interfacial bond slip,explore the main factors affecting the interfacial bonding properties,is the key to establishment the computational theory of steel reinforced Reactive Powder Concrete structure.Based on the experiments of six steel reinforced Reactive Powder Concrete short column push-out tests,the process of interface fracture and interfacial b ond mechanism are analyzed.The distribution mode of bond stress along the embedment length of shape steel and Reactive Powder Concrete interface is studied,and its equation is provided.Several important parameters of interfacial behavior between shape steel and Reactive Powder Concrete are discussed.Based on test results,the computational formula of ultimate bond strength is established,the calculation results are in good agreement with the experimental results.The present results are believe to be useful for the establishment of calculating theory and finite element analysis of steel reinforce Reactive Powder Concrete structures.The ANSYS software is used for the finite element analysis of the test.The finite element model of steel reinforced Reactive Powder Concrete short column push-out tests is established,Simulation the process of interfacial bonding failure between shape steel and Reactive Powder Concrete.The results of analogue analysis has basically consistent with the test phenomenon.