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Built-in FRP locally restrained concrete combined member

A technology of restraint concrete and local restraint, applied in the direction of columns, piers, pillars, etc., can solve the problems of increasing the amount of FRP, limited restraint effect, reduced restraint effect, etc., to avoid steel corrosion, good durability, and high bearing capacity. Effect

Inactive Publication Date: 2015-11-18
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still some deficiencies in this type of member: firstly, the restraining effect of FRP on concrete has a significant effect only in circular cross-section columns. For other cross-sectional shapes, especially commonly used rectangular cross-section columns, this restraining effect is very limited; Secondly, under the condition of eccentric force, especially when the eccentric distance is large, this restraint effect will be significantly reduced or even disappeared; in addition, this restraint effect will also decrease with the increase of column size, so it is necessary to increase the amount of FRP

Method used

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  • Built-in FRP locally restrained concrete combined member
  • Built-in FRP locally restrained concrete combined member
  • Built-in FRP locally restrained concrete combined member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as Figure 8 Shown: A built-in FRP locally confined concrete composite column for high-rise structures, which is composed of an external concrete column 1 and an internal FRP-confined concrete sub-column 2. Among them, the external concrete column 1 is an ordinary concrete column, and the longitudinal reinforcement is 12C φ 20. The stirrup is φ12100, the concrete of the column body is C30, and the thickness of the protective layer is 30mm. The FRP confined concrete sub-column 2 is composed of an FRP pipe 3, an internal concrete 4 and an internal profile 6, and the FRP pipe 3 is a carbon fiber reinforced epoxy resin winding pipe with a circular cross section. Concrete 4 inside the FRP pipe adopts C60 high-strength concrete. The internal profile 6 is 20#A I-beam, and the FRP-confined concrete sub-column 2 is arranged inside the stirrup along the four corners of the composite column section. All concrete was poured in situ.

Embodiment 2

[0034] Such as Figure 9 Shown: a high-bearing-capacity pile in the form of a built-in FRP locally restrained concrete composite structure, consisting of an external concrete column 1 and an internal FRP-confined concrete sub-column 2. The external concrete column 1 is a steel pipe-concrete-steel pipe column with a circular cross-section, in which the longitudinal reinforcement is 8 φ 25. The stirrup is φ14150, the column concrete is C40, and the thickness of the protective layer is 50mm. The FRP confined concrete sub-column 2 is composed of FRP pipe material 3 and internal concrete 4, and the FRP pipe 3 is a glass fiber reinforced unsaturated polyester resin winding pipe with a circular cross section. The FRP-confined concrete sub-column 2 is arranged on the inner side of the stirrup 9 along the circumferential direction of the longitudinal reinforcement of the composite column section. The combined component is integrally prefabricated in the factory. In order to prevent...

Embodiment 3

[0036] Such as Figure 10 Shown: A built-in FRP locally confined concrete composite structure for large bridge piers, consisting of external concrete-like columns 1 and internal FRP-confined concrete sub-columns 2. The external concrete column 1 is an ordinary reinforced concrete column, its section is a composite section composed of a rectangle and two semicircles, and the interior is a rectangular hollow area, the column body is made of concrete C30, and the thickness of the protective layer is 30mm. The FRP confined concrete sub-column 2 is composed of an FRP pipe 3 and internal concrete 4, and the FRP pipe 3 is a glass fiber reinforced epoxy resin winding pipe with a circular cross section. The concrete 4 inside the FRP pipe 3 adopts C80 high-strength concrete. The FRP-confined concrete sub-column 2 is arranged along the inner side of the stirrup 9 of the semi-circular section of the composite column. All concrete was poured in situ.

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Abstract

The invention discloses a built-in FRP locally restrained concrete combined member, which comprises FRP constrained concrete sub pillars formed by filling FRP tubes with concrete. Multiple FRP constrained concrete sub pillars are embedded in concrete pillars to jointly bear force with the external concrete pillars so as to form a built-in FRP locally restrained concrete combined pillar; and the multiple FRP constrained concrete sub pillars are embedded in a concrete shear wall to form an FRP locally constrained concrete combined shear wall. According to the invention, the combined pillar and combined shear wall adopt the built-in FRP constrained concrete sub pillars to improve the integral forced performance, the combined pillar is applicable to such engineering fields as large-scale bridge piers, high-bearing capacity concrete piles and super high-rise structure colossal columns, and the combined shear wall is applicable to super high-rise structures and high structures in high seismic intensity areas.

Description

technical field [0001] The invention relates to an FRP restrained concrete composite member, which comprises a composite column and a composite shear wall. Background technique [0002] FRP-confined concrete members have a good restraint effect on the internal concrete due to the external FRP, which can effectively inhibit the micro-crack propagation of the concrete under compression, thereby significantly improving the bearing capacity and deformation capacity of the compression members. At present, there are still some deficiencies in this type of member: firstly, the restraining effect of FRP on concrete has a significant effect only in circular cross-section columns. For other cross-sectional shapes, especially commonly used rectangular cross-section columns, this restraining effect is very limited; Secondly, under the condition of eccentric force, especially when the eccentricity is large, this restraint effect will be significantly reduced or even disappeared; in addit...

Claims

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Application Information

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IPC IPC(8): E04C3/36
Inventor 齐玉军孙运楼刘伟庆方海冯鹏
Owner NANJING UNIV OF TECH
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