Experimental study and theoretical analysis of limbs, concrete filled steel tubular lattice column

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Of steel pipe concrete lattice column design calculation theory of concrete filled steel tubular lattice column analogy steel lattice column, without considering the shear deformation effect, nor do they reflect the limb of the compressive strength and tensile strength of concrete filled steel tubes have a significant difference this characteristic, the calculated value and experimental value there is considerable error, the design formula there is a big defect. In-depth theoretical analysis of concrete filled steel tubular lattice column presented a more accurate calculation of the theoretical and practical calculation method is necessary.

This article will focus on the ultimate bearing capacity of concrete filled steel tubular lattice column design calculations, the problems, to carry out the following research:
20 batten layout for the K-shaped limbs, steel tube concrete lattice column of bias and axial pressure (1) ultimate bearing capacity and mechanical properties of a pilot study of K decorated tube limbs concrete filled steel tubular lattice column in a certain eccentricity rate and slenderness different than the range of eccentricity and slenderness ratio on the mechanical performance of the lattice column.

(2) consider the influence of shear deformation and limb of the compressive strength of concrete filled steel tubes and tensile strength of its bearing capacity, the establishment of the axial compressive concrete filled steel tubular lattice column stability ultimate load numerical method bias ultimate bearing capacity of segments synthesis of numerical methods and model column value analysis method, and the preparation of the corresponding computer sprial pipe program, through comparative analysis of calculation results with the test results and procedures to validate the proposed calculation method is reasonable in the theoretical calculation methods and standardize procedures.

(3) the use of the proposed segment synthesis and model column values ​​calculated for different steel ratio, eccentricity, slenderness ratio, concrete strength and the strength of steel lattice column, numerical computation, analysis of different steel ratio, eccentricity, slenderness ratio, concrete strength and steel strength reduction factor of the lattice columns.
(4) the use of thin shell theory and thin-walled theory column limb steel pipe and decorated with shell and tube partial derivation of the local buckling of concrete filled steel tubes steel tube shell critical load that concrete filled steel tubes steel shell is not pure steel pipe shell has buckling load.
(5) of the existing norms of order on concrete filled steel tubular lattice column eccentricity reduction coefficient and slenderness ratio of the reduction factor calculation results with the numerical results and test results were analyzed, analysis three procedures in the eccentricity reduction factor slenderness ratio of the reduction factor to calculate the terms of the advantages and disadvantages. Proposed the concept of concrete filled steel tubular lattice column equivalent slenderness than in the modified equivalent slenderness ratio on the basis of simple, practical, clear physical meaning of ultimate bearing capacity of concrete filled steel tubular lattice column practical formula.

Key words: the ultimate bearing capacity of Experimental Welded pipe – study on the theory of concrete filled steel tubular lattice column analysis and design methods

[Degree-granting units: Central South University

[Degree levels: Master

[Degree-granting Year: 2009

【Key Words】: TU398.9