Method for calculating axial compression bearing capacity of concrete filled steel tube short column

Abstract

The invention discloses a method for calculating the axial pressure bearing capacity of a concrete-filled steel tube short column, and the method comprises the steps: building an expression of the unified axial pressure bearing capacity of round, square and square concrete-filled steel tube short columns with fillets, representing the cross-sectional area of concrete in the concrete-filled steel tube cross section; representing the section area of the steel pipe in the steel pipe concrete section; cF is a constraint effect coefficient. The method is used for calculating the axial pressure bearing capacity of the square concrete filled steel tube short column, the circular concrete filled steel tube short column and the square concrete filled steel tube short column with fillets, the calculation expressions are unified, the bearing capacity expression established on the basis of mature and universal steel and concrete yield criteria is clear in concept, the section change rule is also met, and the method is suitable for large-scale popularization and application. And a bearing capacity calculation formula is not limited by the material strength, and the method is suitable for calculating the axial pressure bearing capacity of various concrete filled steel tube short columns.

Description

technical field [0001] The invention relates to a bearing capacity calculation method in engineering, in particular to a calculation method of the axial compression bearing capacity of a concrete-filled steel tube short column. Background technique [0002] At present, there are four main specifications for the calculation of the axial compressive bearing capacity of CFST short columns, the Chinese specification GB50936-2014, the Japanese AIJ 2001, the European specification Eurocode 4, and the American specification AISC 360-16. The above four specifications can only provide circular and The formula for calculating the bearing capacity of CFST with square section is as follows: [0003] [0004] It can be seen from the table that the calculation expressions of the bearing capacity of the circular CFST and the square CFST are not uniform, and many parameters need to be calculated. In addition, for the square CFST with rounded corners, none of the above four specifications...

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Problems solved by technology

[0004] It can be seen from the table that the calculation expressions for the bearing capacity of circular CFST and square CFST are not uniform, and many parameters need to be calculated. In addition, for square CFST with rounded corners, the above four specifications cannot calculate the axial pressure bearing pressure, and the calculation formula for the axial compressive bearing capacity provided by the above specification cannot achieve the effective unification of circular CFST and square CFST, nor can it reflect the evolution law of the inherent continuity of the two cross-sections (square cross-section and circular cross-section) (also shape factor The effect of changing law on section bearing capacity)

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