Method for calculating bearing capacity of confined concrete combination column under action of bias pressure

Abstract

The invention relates to a method for calculating the bearing capacity of a confined concrete combination column under the action of bias pressure, the combination column comprises a polygonal steel pipe and a corrugated plate, and concrete is poured in the polygonal steel pipe to form second cavity concrete; every two adjacent polygonal steel pipes are connected through a corrugated plate, the polygonal steel pipes and the corrugated plates are welded to form a special-shaped multi-cavity body, and concrete is poured into the special-shaped multi-cavity body to form first cavity concrete. The bearing capacity of the confined concrete combination column under the action of bias pressure is jointly determined according to the first cavity concrete bearing capacity, the second cavity concrete bearing capacity and the polygonal steel pipe bearing capacity in the special-shaped multi-cavity. According to the method, the bias bearing capacity of the combination column can be calculated only by restraining information such as the strength and the geometric dimension of the material of the concrete combination column, the problem of overload of the combination column is solved, and meanwhile the engineering precision requirement can be met.

Description

technical field [0001] The invention relates to the technical field of bearing capacity calculation, in particular to a calculation method for the bearing capacity of a constrained concrete composite column under bias pressure. Background technique [0002] Square concrete-filled steel tube columns, such as a corrugated side plate-square concrete-filled steel tube column disclosed in the Chinese invention patent (CN111507040A), have the advantages of simple node structure, convenient connection, regular building layout, and good bending resistance, so they are widely used in high-rise buildings. under construction. However, the amount of steel used in ordinary square concrete-filled steel tube columns is relatively large, and the steel tube wall is prone to local buckling when under pressure, and the cross-section quits work earlier; and the square steel tubes confine the concrete to the corners mainly, and the confinement effect in the middle is general. Due to the phenome...

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Problems solved by technology

However, the amount of steel used in ordinary square concrete-filled steel tube columns is relatively large, and the steel tube wall is prone to local buckling when under pressure, and the cross-section quits work earlier; and the square steel tubes confine the concrete to the corners mainly, and the confinement effect in the middle is general. The phenomenon of stress concentration, the effect of the steel pipe on the concrete hoop is not fully exerted, and the comprehensive mechanical performance and economic efficiency are not strong

[0003] In actual engineering, due to the influence of material heterogeneity, construction deviation and other factors, ideal axially stressed members are rare, and most articles focus on the study of bias and seismic performance of CFST composite columns. However, the research on its eccentric mechanical properties is not deep enough, and the existing codes for concrete filled steel tubes are poor in predicting the eccentric bearing capacity of the new type of composite column, and the constraint characteristics of corrugated plates cannot be accurately considered.

[0004] In summary, the existing composite columns cannot meet the structural performance and local buckling resistance requirements of engineering projects, and at the same time, there is a lack of a feasible calculation method for the ultimate bearing capacity under bias

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