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Research on Flexural Stiffness of Concrete-filled Square Steel Tubular Column

Author: ZhangJie
Tutor: ShenDongJian
School: Agricultural University of Hebei
Course: Structural Engineering
Keywords: Steel square tubular column Bending stiffness Nonlinear Analysis Numerical integration
CLC: TU398.9
Type: Master's thesis
Year: 2011
Downloads: 91
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Abstract


Steel pipe concrete structure is concrete filled steel pipe to form a new type of composite structure, combined with it the advantages of concrete and steel pipe in concrete in a three-way pressurized state, improve core strength and deformation of concrete . In recent years, the rapid development of steel pipe concrete structure in our country, especially in the last decade has been widely used in multi-seismic regions. In the seismic design and calculation process, the deformation capacity of the structure is a very important indicator, the calculated deformation capacity inevitably involves the bending stiffness of the concrete to the steel pipe. Recent decades, scholars lot of research for the mechanical properties of the steel pipe concrete, but the majority is calculated on the flexural capacity of less bending stiffness. Commonly used in the national seismic code is \ability as well as the actual damage in a major earthquake. In this context, the performance-based seismic design philosophy caused widespread concern of the country. The structure of the elastic-plastic analysis method has gradually become an indispensable part of performance-based seismic design. Elastoplastic analysis of the structure, how to determine the location of the plastic hinge and study the bending stiffness of the steel tubular column is particularly important. This paper analyzes the the CFST columns flexural stiffness and the use phase of the calculation method of the component bending stiffness, reference provides a performance-based seismic design and research for the steel pipe concrete structure. In order to study the cross-section of the steel square tubular column when a plastic hinge deformation and corresponding sectional flexural stiffness, this paper using numerical integration methods, the use of the the FORTRAN language preparation of the cross-section of the steel square tubular column nonlinear full analysis program (M-Φ program). Procedures and in accordance with the existing experimental data, test the measured values ??with the theoretical values ??of the comparison shows that, both in good agreement with the preparation of the program is safe and reliable, and can be used for the cross-section of the steel square tubular column stress analysis. By the cross-section of the M-Φ curve calculated equivalent yield corresponding to the ratio of the bending stiffness EI ff steel pipe concrete theory stiffness E s I s Ec Ic as steel concrete section bending stiffness reduction factor in the M-Φ procedures basis, using numerical integration method for the preparation of the load - displacement procedure (P-Δ procedures) for the square steel tube concrete column stress analysis. In addition, still square steel pipes on the basis of concrete columns nonlinear analysis program, using numerical integration method for the preparation of the program of calculation of concrete filled steel tubular column flexural stiffness reduction factor (ma program). M-Φ procedures and ma program in the preparation of the application of this article, the three-section in the form of steel square tubular column section and components, four concrete strength grade, three-containing steel ratio, four steel strength, four axial compression ratio, force-deformation properties under four slenderness ratio calculated results show that the CFRT column section corresponding elastic cross section in the plastic hinge bending stiffness was significantly smaller than the cross section of the initial flexural stiffness, its value addition section form, material properties, steel rate of factors, but also with the axial compression ratio. The flexural stiffness EI ff calculated by data fitting. In addition, the analysis found that the smaller stage steel square tubular column core concrete contribution to the bending stiffness of the column by computational analysis, proposed considering material nonlinearity and geometric nonlinear characteristics bending steel square tubular column The stiffness reduction recommendations coefficient.

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