Concrete-filled square steel tubular column with built-in spiral stirrup

A technology of spiral stirrups and concrete columns, applied in the direction of columns, pier columns, pillars, etc., can solve the problems of uneven core concrete restraint, local buckling of pipe walls, and increased welding difficulty, so as to improve the poor restraint effect And non-uniform, good constraint performance, template-saving effect

Inactive Publication Date: 2014-03-05
GUANGXI UNIV
7 Cites 9 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, since the square steel pipe section is composed of four straight sides, the restraint effect of the steel pipe on the core concrete at the same section is not uniform, the restraint is mainly concentrated in the four corners, and the restraint in the middle of the straight side is very weak. Therefore, the bearing capacity of the square steel pipe concrete The ductility is lower than that of circular concrete filled steel tubes with the same cross-sectional size, and the tube wall is prone t...
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Method used

Built-in spiral stirrup square steel pipe concrete column, built-in spiral stirrup to the restriction of core concrete, square steel pipe to the restriction of core concrete, the concrete between square steel pipe and spiral stirrup to the restriction of spiral stirrup, the three cooperate The function can effectively restrain the local buckling of the ...
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Abstract

The invention belongs to a building structure member in the technical field of building engineering, and particularly relates to a concrete-filled square steel tubular column with a built-in spiral stirrup. The concrete-filled square steel tubular column comprises a square steel tube, the spiral stirrup, a longitudinal reinforcement and core concrete, wherein the longitudinal reinforcement is arranged on the inner wall of the spiral stirrup to form a spiral reinforcement cage which is arranged in the center of the square steel tube, the core concrete is filled in the internal space of the square steel tube to form the concrete-filled steel tubular column with the built-in spiral stirrup. The concrete-filled steel tubular column with the built-in spiral stirrup has the advantages of being high in bearing capacity, good in ductility, excellent in anti-seismic property, simple in structure, simple and convenient to construct, and good in economy.

Application Domain

StrutsPillars +1

Technology Topic

Steel tubeDuctility +2

Image

  • Concrete-filled square steel tubular column with built-in spiral stirrup
  • Concrete-filled square steel tubular column with built-in spiral stirrup
  • Concrete-filled square steel tubular column with built-in spiral stirrup

Examples

  • Experimental program(1)

Example Embodiment

[0023] Specific embodiment: The square steel tube concrete column with built-in spiral stirrups of this embodiment is composed of square steel tube 1, spiral stirrup 2, longitudinal steel bar 3 and core concrete 4. The inner wall of spiral stirrup 2 is provided with longitudinal steel bar 3 to form a spiral reinforcement cage. Place the spiral reinforcement cage at the center of the square steel tube 1, and the central axis of the spiral reinforcement cage coincides with the central axis of the square steel tube 1, and fill the inner space of the square steel tube 1 with core concrete 4 to form a square steel tube concrete column with built-in spiral stirrups.
[0024] The heights of the spiral steel bars 2 and the longitudinal steel bars 3 and the square steel pipe 1 described in this embodiment are the same. The longitudinal steel bars 3 are tied or welded to the inner wall of the spiral stirrup 2 and the minimum distance from the inner wall surface of the square steel pipe 1 to the outer surface of the spiral stirrup 2 is 30-50mm. The square steel pipe 1 can be made of Q235 steel, Q345 steel, Q390 steel, and Q420 steel. The diameter and spacing of the spiral stirrup 2 and the diameter and number of the longitudinal steel bars 3 are determined according to the wall thickness and section size of the square steel pipe 1. The number of steel bars 3 is not less than 4, the spiral stirrup 2 is cold-formed by HPB300 or HRB335 steel bars with a diameter of 6-12mm, the longitudinal steel bars 3 are made of HRB335 or HRB400 steel bars with a diameter of 10-16mm; the core concrete 4 is made of Ordinary concrete or high-performance concrete.
[0025] The square steel tube concrete column with built-in spiral stirrups, the built-in spiral stirrups restrain the core concrete, the square steel tube restrains the core concrete, and the concrete between the square steel tube and the spiral stirrup restrains the spiral stirrup. Effectively suppress the local buckling of the steel plate, improve the bearing capacity and ductility of the concrete-filled square steel tube column, and give full play to the performance of the material, so that the concrete-filled square steel tube column with built-in spiral stirrups has high bearing capacity, good ductility, superior seismic performance, and simple construction , Features of good economy.

PUM

PropertyMeasurementUnit
Diameter6.0 ~ 12.0mm
Diameter10.0 ~ 16.0mm

Description & Claims & Application Information

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