Novel composite constraint square steel tube concrete column

Abstract

The invention discloses a novel composite constraint square steel tube concrete column, and relates to the field of assembling type constructional engineering. The novel composite constraint square steel tube concrete column comprises a reinforcement cage, a square steel tube, stiffening ribs and core concrete, wherein four inner walls of the square steel tube are independently welded with the stiffening rib; the square reinforcement cage is arranged in the square steel tube; four longitudinal ribs of the reinforcement cage are independently connected with four stiffening ribs; and the core concrete is poured in the square steel tube. The square steel tube and square stirrups perform a composite constraint effect on the core concrete, large confining pressure is provided, the core concreteis under a three-directional stress state, the compression bearing capacity of the concrete is increased, and the brittle failure of the concrete is delayed. In addition, requirements, including goodeconomic efficiency, a simple production technology, convenience in construction and installation and the like, can be met, and the novel composite constraint square steel tube concrete column can bewidely applied to an assembling type structural system.

Description

technical field [0001] The invention relates to the field of prefabricated construction engineering, in particular to a composite constrained square steel pipe concrete column with a built-in square stirrup cage. Background technique [0002] Steel tube confined concrete column is a new type of composite structural member developed since modern times, and the most widely used ones are circular steel tube confined concrete and square steel tube confined concrete. The confining pressure provided by the circular steel pipe on the core concrete in the circular steel pipe concrete is relatively large, and the restraint effect is relatively uniform, so the restraint effect on the core concrete is stronger, and the circular steel pipe is less prone to local buckling than the square steel pipe in the stress process, but The flexural bearing capacity of circular steel tube concrete is small, and its connection structure with the beam in the structural frame is relatively complicated....

AI Technical Summary

Problems solved by technology

However, the constraints of square steel tubes on the core concrete are mainly concentrated at the four corners, and the constraint effect on the concrete at the four sides is small, and the square steel tubes are prone to local buckling under the action of vertical loads

At present, the confinement effect of steel pipes on concrete is mainly enhanced by using restraint tie rods, built-in spiral stirrups or round stirrups, and stiffeners at the corners of steel pipes. , but the above method has disadvantages such as high cost, difficult positioning of component production, and complicated assembly process on site.

[0003] Therefore, it is necessary to design a new type of composite structural member that not only has the advantages of square concrete filled steel tube concrete, but also overcomes the shortcomings of square steel tube concrete, such as poor restraint, easy buckling of steel tubes, and poor fire resistance.

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