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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 effect
At present, the strength of concrete filled in the steel sleeve is not high, which affects the reinforcement effect
[0007] At present, in the reinforcement of steel sleeves, concrete is not ultra-high performance concrete, and the restraining effect of steel sleeves is far inferior to that of steel tubes for ultra-high performance concrete

Method used

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  • 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
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 As shown, when the original reinforced concrete column is a circular structure, first plant bars on the existing concrete surface 1; make a half-section steel pipe, hoist it in place and fix it, and weld the two semi-circular sections to form a closed steel pipe 2; Pour ultra-high performance concrete 3 into the steel pipe 2; wrap 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 800mm.

[0040] Rebar planting 1 adopts HRB335 steel bars with a diameter of 12mm, and the spacing along the longitudinal direction of the column is 100mm, and the depth of planting bars is 88mm.

[0041] The type of steel used in the steel pipe 2 is Q345, the thickness is 30 mm, and the length of the steel pipe is 3.5 m. The axis of the steel pipe is concentric with the original reinforced concrete column 5 .

[004...

Embodiment 2

[0045] Such as figure 2As shown, when the original reinforced concrete column is a square structure, first plant bars on the existing concrete surface; make half a steel pipe, hoist it in place and fix it, and weld two L-shaped cross-section steel members to form a closed square steel pipe 2. Pouring ultra-high performance concrete 3 in the steel pipe 2, and wrapping FRP cloth 4 outside the steel pipe 2, and performing fire prevention treatment on the FRP.

[0046] In this embodiment, the original reinforced concrete column 5 adopts a square column with a side length of 600 mm.

[0047] Rebar planting 1 adopts HRB335 steel bars with a diameter of 12mm, and the spacing along the longitudinal direction of the column is 100mm, and the depth of planting bars is 95mm.

[0048] The type of steel used in the steel pipe 2 is Q345, the thickness is 20mm, and the length of the steel pipe is 3m. The axis of the steel pipe is concentric with the original concrete square column.

[004...

Embodiment 3

[0052] Such as image 3 As shown, when the original reinforced concrete column is a circular structure, the steel pipe 2 is placed eccentrically. Circular cross-section steel plates are welded to form closed steel pipes 2; ultra-high performance concrete 3 is poured into the steel pipes 2, and FRP cloth 4 is wrapped around the steel pipes 2 to perform fireproofing treatment on the FRP.

[0053] In this embodiment, the original reinforced concrete column 5 adopts a circular section column with a diameter of 600 mm.

[0054] Rebar planting 1 adopts HRB335 steel bars with a diameter of 12mm, and the spacing along the longitudinal direction of the column is 80mm, and the depth of planting bars is 105mm.

[0055] The type of steel used in the steel pipe 2 is Q345, the thickness is 25mm, and the length of the steel pipe is 3m. The axis of the steel pipe is not concentric with the existing concrete circular column.

[0056] The axial compressive strength of ultra-high performance ...

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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.

Description

technical field [0001] The invention relates to a fiber-reinforced polymer winding steel pipe ultra-high performance concrete reinforced concrete column, which belongs to the technical field of concrete composite column structure. technical background [0002] FRP-wound steel tube ultra-high performance concrete outsourcing reinforced concrete column means that when strengthening the existing reinforced concrete column, the outside of the original column is surrounded by on-site welded steel pipes, the steel pipes are filled with ultra-high performance concrete, and FRP cloth is wound outside the steel pipes. [0003] It has been more than 20 years since the research and application of composite columns for the reinforcement of existing concrete columns. It has outstanding advantages, such as good mechanical performance and significant economic benefits. [0004] In the concrete-filled steel tube structure, the steel tube serves as the structural formwork and effectively res...

Claims

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Application Information

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IPC IPC(8): E04G23/02E04C3/36
Inventor 邓宗才
Owner BEIJING UNIV OF TECH
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