CN100507176C

CN100507176C - Steel pipe-FRP pipe core concrete combination structure

Info

Publication number: CN100507176C
Application number: CNB2007101910926A
Authority: CN
Inventors: 王静峰
Original assignee: Hefei University of Technology
Current assignee: Hefei University of Technology
Priority date: 2007-12-06
Filing date: 2007-12-06
Publication date: 2009-07-01
Anticipated expiration: 2027-12-06
Also published as: CN101177965A

Abstract

The invention relates to the composite structure of a steel pipe-FRP with concrete being filled inside, which is characterized in that the composite structure is a hollow pipe column which comprises a steel pipe used as a lateral wall, an FRP barrel used as a inside wall and a concrete layer which is fixedly connected between the steel pipe and the FRP barrel. The invention has good structural mechanical performance and earthquake resistance, which reduces the sole weight of the structure and strengthens the bending rigidity of the structure, thereby resulting in the convenient convey of the components and quick construction and installation; the invention is applicable to strengthen the modification works, which is especially suitable for the pole and bracing members of buildings, bridges and special structures.

Description

A kind of steel pipe-FRP pipe concrete filled combining structure

Technical field

The present invention relates to tubing, a kind of being applied in the technical field of structural engineering of more specifically saying so can be used for strengthening and rebuilding engineering; Be particularly suitable for post and supporting member as building, bridge and special construction.

Background technology

The FRP pipe is meant that fibre reinforced composites (FRP) by the tubulose section bar that production technologies such as pultrusion, mold pressing and winding form, can be used for the Structural Engineering field.At present, in actual engineering, encased structures and fiber reinforced plastic FRP confined concrete structure applications are more, and its principal mode is included in concreting in the steel pipe, or in FRP pipe fill concrete, or twine the load-bearing pillar of concrete formation solid section with FRP cloth.

In actual engineering, solid steel pipe concrete or FRP pipe concrete are normally used for axial compression or the eccentric less bending component of load.Yet, when member slenderness ratio or load eccentricity are big, its bearing capacity to a great extent will be by its bending rigidity control, this moment, how many bending rigidities solid steel pipe concrete or FRP pipe concrete can not provide near the material at centre of form position, cross section, but increased the deadweight of member, member section is also bigger simultaneously, makes effective usage space of building and structure reduce.

Summary of the invention

The present invention is for avoiding above-mentioned existing in prior technology weak point, a kind of strengthening and rebuilding engineering that can be used for being provided; Be specially adapted to build, bridge and the post of special construction and steel pipe-FRP pipe concrete filled combining structure of supporting member, in the hope of obtaining good structure tension performance and anti-seismic performance, reduce the bending rigidity of dead load and raising structure, be convenient to transportation and installation.

Technical solution problem of the present invention adopts following technical scheme:

The characteristics of steel pipe of the present invention-FRP pipe concrete filled combining structure be described combining structure be by as the steel pipe of lateral wall, as the FRP core pipe of inside wall and be cemented in steel pipe and FRP core pipe between the hollow tubing string that constitutes of layer of concrete.

Design feature of the present invention also is the cross section of described combining structure, is the cross section that the cross section of the FRP core pipe of cross section and the inner circle of the steel pipe of the circle with the outside, square or rectangle, square or rectangle is combined to form arbitrarily.

Compared with the prior art, beneficial effect of the present invention is embodied in:

1, the present invention has made full use of the premium properties of steel pipe, FRP pipe and concrete three kinds of materials and has interacted, the shortcoming when having remedied solid component as the big member of high-fineness ratio or load eccentricity.On the one hand, lateral wall steel pipe and FRP core pipe can the operative constraint concrete, can obviously improve the stress performance of concrete material; On the other hand, layer of concrete has also effectively improved the strength and stiffness of FRP pipe, prevents steel pipe generation flexing, and bending rigidity is big, from heavy and light, and stress performance and anti-seismic performance are good, and have superior fire resistance.

2, the present invention is after with steel pipe and FRP core pipe installation in position, and concreting between steel pipe and core pipe forms combining structure, can effectively reduce construction formwork expense and operating expenses.

3, the member transportation is convenient in the present invention, and construction and installation are quick, can be used for strengthening and rebuilding engineering; Be specially adapted to build, the post and the supporting member of bridge and special construction.

Description of drawings

Fig. 1 is the invention structural representation.

Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 and Fig. 9 are the different embodiment structural representations of the present invention.

Number in the figure: 1 is that steel pipe, 2 is that FRP core pipe, 3 is layer of concrete.

Below by the specific embodiment, the invention will be further described in conjunction with the accompanying drawings.

The specific embodiment

Referring to Fig. 1, by as the steel pipe 1 of lateral wall, as the FRP core pipe 3 of inside wall and be cemented in steel pipe 1 and FRP core pipe 3 between layer of concrete 2 constitute hollow tubing string.

In concrete the enforcement, the section form of combining structure is with any combination between the FRP core pipe 3 of the steel pipe 1 of circular, square or rectangle and circular, square or rectangle.Comprise:

The circular FRP core of circular steel pipe box shown in Figure 1 pipe concrete filled structure;

The square FRP core of circular steel pipe box pipe concrete filled structure shown in Figure 2;

Circular steel pipe box rectangle FRP core pipe concrete filled structure shown in Figure 3;

The circular FRP core of square bar pipe box shown in Figure 4 pipe concrete filled structure;

The square FRP core of square bar pipe box pipe concrete filled structure shown in Figure 5;

Square bar pipe box rectangle FRP core pipe concrete filled structure shown in Figure 6;

The circular FRP core of rectangle steel pipe box shown in Figure 7 pipe concrete filled structure;

The square FRP core of rectangle steel pipe box pipe concrete filled structure shown in Figure 8;

Rectangle steel pipe box rectangle FRP core pipe concrete filled structure shown in Figure 9.

Below in conjunction with drawings and Examples technical scheme of the present invention is described further.

In the present embodiment, steel pipe 1 can adopt regular tenacity steel or the yield strength high-strength steel more than 550Mpa, FRP core pipe 3 can adopt glass fiber GFRP pipe, carbon fiber CFRP pipe or aramid fiber AFRP pipe, and concrete can be ordinary concrete or compressive strength high-strength concrete and the self-compacting concrete at 80-120MPa.Concrete preparation is that the concreting layer 3 betwixt behind steel pipe 1 and FRP core pipe 3 installation in position, and the fixed formation of layer of concrete promptly forms the combining structure of steel pipe-FRP pipe concrete filled.

The present invention can specifically be applied to column piece, support member, truss in the civil engineering etc.

Claims

1, a kind of steel pipe-FRP pipe concrete filled combining structure, it is characterized in that described combining structure be by as the steel pipe (1) of lateral wall, as the FRP core pipe (3) of inside wall and be cemented in described steel pipe (1) and FRP core pipe (3) between the hollow tubing string of layer of concrete (2) formation.

2, steel pipe according to claim 1-FRP pipe concrete filled combining structure, the cross section that it is characterized in that described combining structure is the cross section that the cross section of the FRP core pipe (3) of cross section and the inner circle of the steel pipe (1) of the circle with the outside, square or rectangle, square or rectangle is combined to form arbitrarily.