Ultra-high-performance concrete reinforced concrete column with fiber reinforced polymers wound around steel pipe

A technology of concrete reinforcement and reinforced concrete columns, which is applied in the direction of columns, pier columns, pillars, etc., can solve the problems that the confinement effect of steel sleeves is not as good as that of steel pipe confinement ultra-high performance concrete, the concrete strength is not high, and the structural integrity is not strong, etc., to achieve Improved corrosion resistance, high strength, and enhanced seismic performance

Inactive Publication Date: 2014-08-27
BEIJING UNIV OF TECH
9 Cites 26 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0006] At present, when steel casings reinforce building columns and bridge pier columns, the steel pipes are filled with mortar, ordinary concrete, high-strength concrete, self-compacting concrete, and fiber concrete. Due to the small gaps, it is difficult to vibrate and compact, resulting in weak structural integrity. Affect the reinforcement...
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Abstract

The invention provides an ultra-high-performance concrete reinforced concrete column with fiber reinforced polymers wound around a steel pipe, and relates to the technical field of novel combination column reinforced existing structures. FRP cloth is wound around the steel pipe and used for wrapping around and reinforcing existing reinforced concrete columns. A combination column comprises planting ribs, the steel pipe, ultra-high-performance concrete, the FRP cloth and an original reinforced concrete column. Compared with the method for expanding the section of traditional reinforced concrete, high-strength steel pipe concrete (steel pipe self-compaction concrete and steel pipe common fiber concrete) and an angle steel reinforced column, the component can effectively improve carrying capacity, deformability, seismic-resistance and antiseptic durability. Besides, the ultra-high-performance concrete reinforced concrete column is especially suitable for reinforcing high-rise and ultra-high-rise underlying columns, large-span bridge pier columns, structural engineering in a bad environment and industrial factory buildings in a corrosion environment.

Application Domain

StrutsBuilding repairs +2

Technology Topic

Steel tubeRebar +15

Image

  • Ultra-high-performance concrete reinforced concrete column with fiber reinforced polymers wound around steel pipe
  • Ultra-high-performance concrete reinforced concrete column with fiber reinforced polymers wound around steel pipe
  • Ultra-high-performance concrete reinforced concrete column with fiber reinforced polymers wound around steel pipe

Examples

  • Experimental program(5)

Example Embodiment

[0037] Example one
[0038] Such as figure 1 As shown, when the original reinforced concrete column is a circular structure, first plant the reinforcement 1 on the existing concrete surface; make a half-section steel pipe, hoist it in place and fix it, and weld the two half-circle sections into a closed steel pipe 2; Pour the ultra-high performance concrete 3 in the steel pipe 2; and wrap the FRP cloth 4 outside the steel pipe 2, and perform fire protection treatment on the FRP.
[0039] In this embodiment, the original reinforced concrete column 5 adopts a circular section column with a diameter of 800 mm.
[0040] The planting bar 1 adopts HRB335 steel bar with a diameter of 12mm, and the arrangement spacing along the longitudinal direction of the column is 100mm, and the planting bar depth is 88mm.
[0041] The steel model used for steel pipe 2 is Q345, the thickness is 30mm, and the steel pipe length is 3.5m. The steel tube axis is concentric with the original reinforced concrete column 5.
[0042] The axial compressive strength of ultra high performance concrete 3 is C130MPa.
[0043] FRP cloth 4 adopts carbon fiber bidirectional cloth, double-layer cloth and column axis +55 degrees wound on the outer surface of the steel pipe.

Example Embodiment

[0044] Example two
[0045] Such as figure 2 As shown, when the original reinforced concrete column is a square structure, first plant the reinforcement 1 on the existing concrete surface; make half a steel tube, hoist it in place, fix it, and weld the two L-shaped section steel members into a closed square steel tube 2; Pour ultra-high performance concrete 3 in the steel pipe 2, and wind FRP cloth 4 outside the steel pipe 2, and fire-proof the FRP.
[0046] In this embodiment, the original reinforced concrete column 5 adopts a square column with a side length of 600 mm.
[0047] The planting bar 1 adopts HRB335 steel bar with a diameter of 12mm, and the arrangement spacing along the longitudinal direction of the column is 100mm, and the planting bar depth is 95mm.
[0048] The steel model used for steel pipe 2 is Q345, the thickness is 20mm, and the steel pipe length is 3m. The steel tube axis is concentric with the original concrete square column.
[0049] The axial compressive strength of ultra-high performance concrete 3 is C140MPa and the thickness is 35mm.
[0050] FRP cloth 4 adopts bidirectional aramid cloth, and three layers are wound on the outer surface of the steel pipe at +45 degrees to the axis of the column.

Example Embodiment

[0051] Example three
[0052] Such as image 3 As shown, when the original reinforced concrete column is a circular structure, the steel pipe 2 is placed eccentrically. First, the reinforcement 1 is planted on the existing concrete surface; the steel pipe of half section is made, hoisted in place and fixed, and the two half The cross-section circular steel plate is welded to form a closed steel pipe 2; ultra-high performance concrete 3 is poured into the steel pipe 2, and FRP cloth 4 is wound around the steel pipe 2, and the FRP is fire-resistant.
[0053] In this embodiment, the original reinforced concrete column 5 adopts a circular section column with a diameter of 600 mm.
[0054] The planting bar 1 adopts HRB335 steel bar with a diameter of 12mm, and the arrangement distance along the longitudinal direction of the column is 80mm, and the planting bar depth is 105mm.
[0055] The steel type used for steel pipe 2 is Q345, the thickness is 25mm, and the steel pipe length is 3m. The steel tube axis is not concentric with the existing concrete circular column.
[0056] The axial compressive strength of ultra-high performance concrete 3 is C145MPa and the thickness is 40mm.
[0057] FRP cloth 4 adopts two-way glass fiber cloth, and 3 layers are wound on the outer surface of the steel pipe at +45 degrees to the axis of the column.
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PUM

PropertyMeasurementUnit
Diameter800.0mm
Diameter600.0mm
Diameter900.0mm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • High strength
  • Improve earthquake resistance
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