Study On Mechanical Properties And Crack Width And Deformation Of Steel Reinforced Reactive Powder Concrete Columns

Reactive powder concrete is a kind of high technology concrete material,mainly composed of two kinds of materials,one is DSP material,the other is fiber reinforced material,which makes the two kinds of materials organically combined,complementary advantages,and mutually promote the final form of active powder concrete.The material has a variety of mechanical characteristics,not only has high toughness and super high durability,but also has super high strength and large density.With the experimental and theoretical research on the mechanical properties of reactive powder concrete gradually deepened,reactive powder concrete has been applied more and more widely in engineering.As a high technology concrete,considering its absolute advantage in the application of civil engineering,it is widely used in various projects,and has high promotion efficiency and development space.The development and utilization of steel reinforced concrete is to make full use of all the high quality functions of concrete.It can be said to have a large number of advantages,such as excellent anti-corrosion kinetic energy,concrete compression function,fire resistance and tensile function of steel.At the same time,the surrounding concrete effectively plays the flexural degree of the protective steel,and the steel will also have a certain limit on the concrete,which makes the bearing capacity of the concrete strengthened.The type steel outsourced reactive powder concrete structure will replace the ordinary concrete on the basis of the steel reinforced concrete.The ultra high compressive strength of the reactive powder concrete makes the bearing capacity of the composite structure greatly improved.The steel fiber of the fractured surface can still bear a certain load until the reactive powder concrete is cracked.Therefore,the composite structure has good ductility and seismic performance and can be used in earthquake areas.At present,the focus of research at home and abroad is focused on the properties of reactive powder concrete.The study of the mechanical properties of the type steel reinforced reactive powder concrete members has not been carried out.And the column is the most basic bearing member in the building.In order to facilitate the popularization and use of the type steel reinforced reactive powder concrete column in the practical engineering,research is of vital importance.The contents of this paper are as follows:(1)Through the axial compression and eccentric compression test of 6 steel reinforced reactive powder concrete columns,the mechanical properties and failure modes of the column specimens under different stress conditions,the law of fracture development and the variation of the specimen deformation with the loading are studied.The damage morphology of the specimen under the same loading condition is roughly the same as that of the crack development.With the increase of the strength grade of the outsourced reactive powder concrete,the ultimate bearing capacity of the column specimen increases.(2)According to the current code and the calculation theory of steel and concrete structure at home and abroad,the ultimate bearing capacity of the two groups of specimens is calculated by different methods and compared with the test results.The calculation parameters are corrected,and the corrected results are close to the test results,and the error is small.(3)The finite element analysis software is used to simulate the axial compression and eccentric compression process of the steel outsourced reactive powder concrete columns,and the specimen model is established and loaded and solved.The experimental results are compared with the simulation results.The influence of reactive powder concrete strength on the bearing capacity of the specimens is further explored.