Built-in polyvinyl chloride (PVC) pipe enhanced square steel pipe concrete combined column

Abstract

The invention discloses a built-in polyvinyl chloride (PVC) pipe enhanced square steel pipe concrete combined column, which comprises a PVC circular plastic pipe, a square steel pipe and concrete, wherein the PVC circular plastic pipe in which the concrete is grouted is embedded in the center of the section of the square steel pipe; and the concrete is grouted in a residual space on the section of the combined column to form a double-sleeve multi-constraint concrete combined column in which one pipe is embedded into another pipe. The combined column has the advantage of improving the comprehensive performance of the square steel pipe concrete column; by the PVC circular pipe, and due to the multiple constraint effect, a constraint effect of the concrete in the column is improved, so that the axial compression strength of the column is improved; furthermore, under the condition that requirements on the bearing capacity and the vibration resistance are met, the sectional area of the column can be greatly reduced by using the cheap PVC plastic pipe, so that the usability of a building space is improved; and the consumption of steel and comprehensive manufacturing cost are reduced.

Description

technical field [0001] The invention belongs to a square steel pipe concrete composite column, a PVC pipe concrete and a composite structural column thereof, in particular to a square steel pipe concrete composite column reinforced with a built-in PVC pipe. Background technique [0002] With the development of modern high-rise, long-span and heavy-duty structures, the "steel-concrete composite structure", which is a combination of steel structure and concrete structure, has been more and more widely used because of its common advantages. As a kind of composite structure, the concrete-filled steel tube composite column is surrounded by external steel pipes, which effectively restricts its lateral development and greatly improves the bearing capacity of the column itself, and the high steel ratio of the section makes this type of composite column It has good anti-seismic performance. Scientific research and engineering practice have shown that the mechanical properties of squ...

AI Technical Summary

Problems solved by technology

The reason is that the confinement mechanism of the circular steel pipe and the square steel pipe to the core concrete is different: the former has the same cross-sectional symmetry axis as the diameter, and the circular steel pipe on the same cross-section has the same lateral deformation, so that the concrete can be uniformly compressed after lateral expansion under compression. Constraint, the restraint effect is good; while the restraint of the square steel pipe section is mainly concentrated in the four corners, the core concrete is compressed and pushed laterally after the square steel pipe is pushed, and the steel plate in the middle of each side is bent and deformed, the restraint capacity is reduced, and the overall mechanical performance is convenient. Not as good as round concrete filled steel pipe

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