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

A technique of confining concrete and calculation methods, applied in design optimization/simulation, instrumentation, electrical digital data processing, etc., can solve problems such as insufficient ferrule function, poor prediction of bias bearing capacity, and buckling of steel pipe walls, etc., to achieve Widely promote the value and application prospects, improve the integrity, and reduce the effect of the production process

Active Publication Date: 2022-04-08
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1- Embodiment 4

[0139] The constrained concrete composite column is made of C30 concrete, and the measured axial compressive strength design value is 33.24MPa; the corrugated plate and polygonal steel pipe are made of Q345 steel, and the measured yield strength design value is 386.33MPa; the wall thickness of the polygonal steel pipe is 3mm, and the corrugated The thickness of the plates was 1.2 mm, and the eccentricities were 0.2, 0.4, 0.6 and 0.8, respectively. The test values ​​of the bearing capacity of the restrained concrete composite column under bias pressure are 3300kN, 3000kN, 2800kN, 2352kN respectively, and the formula values ​​obtained by the calculation method proposed by the present invention are respectively 3341.24kN, 2908.47kN, 2815.33kN, 2259.64kN, Good fit.

[0140] Due to the uncertainty in the test process and the large loss, the eccentric bearing capacity of the confined concrete composite column obtained by ABAQUS finite element simulation is compared with the calculat...

Embodiment 5- Embodiment 9

[0142] Embodiment 5-Example 9 are comparisons of the ultimate bearing capacity of each eccentric test piece under different steel pipe thicknesses and the calculated value of the formula. The specific structural parameters and the bearing capacity calculated with the ABAQUS finite element software are shown in Table 2.

Embodiment 10- Embodiment 21

[0144] Embodiment 10-Example 21 is a comparison of the ultimate bearing capacity of each eccentric specimen under different steel pipe strengths and the calculated value of the formula. The specific structural parameters and the bearing capacity calculated with the ABAQUS finite element software are shown in Table 3.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F30/13G06F119/14
CPCY02T90/00
Inventor 邹昀潘杰王城泉孙泽轩叶华刘美婧
Owner JIANGNAN UNIV
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