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Static Performance Study on the Strengthened of Concrete Filled Square Steel Tubular Beam-columns by CFRP

Author: LiuYang
Tutor: WangQingLi
School: Shenyang University of construction
Course: Structural Engineering
Keywords: CFRP enhance the CFRT Experimental study Bending Mechanical Properties Finite Element Analysis
CLC: TU398.9
Type: Master's thesis
Year: 2011
Downloads: 61
Quote: 0
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Abstract


Steel pipe concrete structure has the characteristics of high capacity, durability, reduce the size of the member section to reduce the structural weight. Concrete filled steel tube has a three-way bound higher compressive strength of concrete, are becoming more widely used in industrial plants, high-rise buildings and bridges and other structures, made good architectural effect. However, the project will encounter Concrete Filled Steel Tubular need to add new features or minor damage, the above comes to take certain measures to constrain reinforcement or repair Moment (square) shaped concrete filled steel tubular. CFRP (Carbon Fiber Reinforced Polymer, of CFRP) reinforced concrete structure technology in recent years developed a new method to enhance the reinforced concrete structure. Currently, formed a research, development, and use of the technology in the world within the new hot spot. In civil engineering, studied the transformation of the existing structure, renovation and reinforcement, that enhance the structure under load; For structure loaded ago, of CFRP completely or partially replace steel for structural enhanced research has begun. In the latter study, a with CFRP Simplified cater to a template-CFRP cylinder of internal pouring reinforced concrete structure in the form of reinforced concrete structures attracted the attention of many professionals. It not only enhances the column strength and ductility, and good corrosion resistance. Concrete Filled Steel Tubular able to adapt to the trends of modern engineering to meet the requirements of modern construction technology, and thus used more and more widely, and achieved good economic and architectural renderings, is one of the important development direction of the structural engineering disciplines. In recent years there has been a new structure of a CFRP-steel tube concrete. This structure is CFRP steel composite pipe pouring concrete, to a CFRP steel pipe concrete structure in order to make up for some deficiencies both in full play to the advantages of steel tube concrete and the FRP concrete cylinder two structural forms, to a certain extent. The CFRP constraints concrete filled steel tube can not only effectively delay the local buckling of the steel pipe, can also improve the bearing capacity and durability of concrete filled steel tube, and the combination of CFRP and steel pipes can also make up for the lack of ductility of CFRP tube concrete. Both from experimental and theoretical analysis, this paper studies CFRP enhance the mechanical properties of the components of the CFRT bending and working mechanism, and finally, on the basis of the analysis of the system parameters, derived component carrying capacity and practical simplified calculation method. System and summarizes the results of domestic and foreign scholars on concrete filled steel tube test, theory and research on CFRP Strengthened Concrete Filled Steel Tubular illustrates the necessity to carry out this study. 2 24 core concrete C50 of CFRP-reinforced steel square tubular Experimental Study of Compression Members. The main parameters to consider: (1) The slenderness ratio (λ), from 10.39-62.35; (2) load eccentricity (e / r) from 0 to 0.6. 3. Using finite element analysis software ABAQUS established CFRP enhanced side concrete filled steel tube bending member state of the force under the load - deformation of the calculation model, the theoretical results to get a large number of experimental results verify more fully explained in this paper finite element analysis model of reliability. Theoretical analysis model of the steel tube and core concrete interactions, the core concrete stress - strain the relationship between changes in the law and other key issues, reveal the mechanism of compression elements in. 4 on the basis of the analysis of the system parameters, derived a practical method of calculation of the bearing capacity, to simplify calculation results with the experimental results are in good agreement. 5 This work summarizes the prospect for future research.

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