Static Performances Of CFRP Strengthen Concrete Filled Square Steel Tube Long Columns In Axial Compression

Concrete filled steel tubular structure isformed within a new type of composite structure. The function of concrete and steel tube can be fully exerted in concrete-filled steel tubestructure, it shows excellent mechanical performance,moreover it can overcome the unstable hysteretic loading capacity.In recent years, with in-depth theoretical study and a new generation of construction technology, engineering has been used widely. Steel tube structure in accordance with the cross-section can be divided into different forms :concrete filled rectangular steel tube, circular steel pipe concrete structure and concrete structure of the polygon and so on.The two laters has been popularly applied in variety fields of engineering. CFRP Concrete-filled tubular composite structures have obvious merits,suchas high strength, good ductility, better seismic behavior, and convenient construction. The effective approach to lighten the weights of tall building structures and its social and economic benefit in practical projects am discussed from the following aspects: the reasonable choice of the structural modal, the method of calculation, the optimization of the structure and the application of high strength and light weight building materials both in China and overseas. CFRP constraint concrete-filled steel tube can not only effectively delaying the buckling, steel can improve the bearing capacity and durability of concrete filled steel tube to make up for the shortage of ductility.Base on the experiment and theoretical analysis, the two aspects have reaserched the CFRP concrete Filled Quadrate Steel Tube Column eccentrically compressed members mechanical properties and working mechanism, end in the system that based on the results of the analysis parameters,while the bearing capacity and practical advice simplified calculation method have been presented.1.Summarizing the domestic and overseas scholars about concrete-filled steel tube tests , theoretical aspects and strengthening of the concrete filled steel tube on CFRP research results systematically, the paper explains the necessity of research work.2.The 24 core concrete strength C60, eccentrically compressed concrete filled rectangular CFRP strengthening of steel tubular members tests.And we acquire the specimen data and draw relevant data curve.3.Using ABAQUS software which based on finite element analysis, established concentrically compressed concrete filled rectangular CFRP-steel tubular Members stress on the deformation under load calculation model, the theoretical calculation result of test results is fully verified in this paper, the reliability of the finite element analysis model. The theoretical analysis model has been studied, and the core tube concrete interaction, the core concrete stress-strain variation on the key problems, thoroughly reveals the axial compression state of the working mechanism.4.In the system based on the results of the analysis parameters, the bearing capacity of the practical Suggestions, simplified calculation method of calculation and test results. The results show good agreement with experimental data.5.To summarize the present paper and give an outlook of the future study in this field.