Method for calculating flexural capacity of variable cross-section column

Abstract

The invention discloses a method for calculating the flexural capacity of a variable cross-section column. The method comprises the following steps: S1, calculating and determining a hoop coefficienttheta of a component; and S2, substituting the parameters into a formula to solve the ultimate flexural capacity. The influence of the corrugated plates, the area conversion of the irregular concretesection, the enhancement of the structural constraint effect and other factors are considered, the steel pipe, the corrugated plates and the concrete can be synergistically stressed under the pure bending load, the overall working performance of the combined column is good, and the deflection and cracks of the combined column can be effectively controlled; and the influence of the concrete strength grade on the flexural capacity of the component under the pure bending load is small. The mean value of the ratio of the crustacean column flexural capacity obtained through a calculation formula tothe ultimate bending moment obtained through finite element analysis is 0.999, the variance is 0.009, and the flexural capacity of the crustacean column can be accurately calculated.

Description

technical field [0001] The invention relates to a calculation method for the flexural bearing capacity of a composite column, in particular to a calculation method for the flexural bearing capacity of a variable-section column. Background technique [0002] In order to actively respond to the application and development of prefabricated structures promoted by the country in the construction industry, the report proposes a new type of prefabricated structural column: carapace column, such as figure 1 shown. The side of the column is made of corrugated steel, which is welded and connected with the square steel pipe, so that the corrugated steel and the steel pipe can achieve synergistic stress, and effectively enhance the bending bearing capacity of the structure. In addition, concrete is filled inside the column to delay the buckling of the steel and improve the fire resistance of the structure. [0003] For structural columns, their bearing capacity is the basis of constru...

AI Technical Summary

Problems solved by technology

[0005] The existing calculation formulas are accurate when calculating the flexural bearing capacity of reinforced concrete columns and steel tube concrete columns, but for the complex composite columns with corrugated plates such as carapace columns, the above formulas do not take Factors such as area conversion of regular concrete sections, enhancement of structural constraint effects, etc.

If these factors are not taken into account, the calculation results obtained will not be accurate enough, and the stress of each part of the carapace column will not be clear enough, making it difficult for each part to fully play the combined role

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