CN203238979U

CN203238979U - FRP reinforcement circular arc concrete shock-resistant column

Info

Publication number: CN203238979U
Application number: CN 201320278974
Authority: CN
Inventors: 郭永昌; 李云雷; 陈光明; 李丽娟
Original assignee: Guangdong University of Technology
Current assignee: Guangdong University of Technology
Priority date: 2013-05-21
Filing date: 2013-05-21
Publication date: 2013-10-16
Anticipated expiration: 2023-05-21

Abstract

The utility model discloses an FRP reinforcement circular arc concrete shock-resistant column. Prefabricated circular arc-shaped HDPE pipe concrete blocks are pasted on the outer surface of an existing concrete column to form a circular or oval arc concrete column; then, an FRP stripe is wound and pasted on the surface of each HDPE pipe concrete block to obtain the FRP reinforcement circular arc concrete shock-resistant column; after the concrete column is reinforced, HDPE pipes wrapped by FRP cloth provide lateral restraint for the concrete column; under the action that the axis is pressed and bears a load, concrete is pressed in three directions, longitudinal cracking at the time of pressing is delayed, and the axle load strength and the ductility of the concrete can be improved remarkably. The FRP reinforcement circular arc concrete shock-resistant column is reasonable in stress performance, resistant to corrosion, strong in deformability, good in shock resistance, convenient to construct, and high in popularization and application value.

Description

FRP reinforces circular arc elastic modulus of concrete post

Technical field:

The utility model relates to a kind of FRP and reinforces circular arc elastic modulus of concrete post.

Background technology:

Structural column in bridge, multilayer and the highrise building is the most basic, most important structural bearing component.All there are the problems such as Lack of support, concrete loosely peel off, crack in the raising of (such as earthquake etc.), long neglected and in disrepair and design standard etc. because geographical environment, natural calamity, many concrete columns.The appearance of these problems, actual conditions do not allow it is all pushed over reconstruction, and take suitable technical measures it is carried out reinforcement and consolidation process more realistic.Enlarging section method and Covered with Angles method are two kinds of conventional methods of reinforced steel concrete post.The Covered with Angles method is more more effective than steel concrete enlarging section method, because the enlarging section method makes dead load and sectional dimension that larger increase be arranged.All comparatively labor intensive and site operation are sometimes comparatively difficult for these two kinds of methods.Except steel were heavier, Covered with Angles encloses cover, and to resist the ability that adverse circumstances corrode relatively poor.Comparatively speaking, FRP (Fiber Reinforced Plastics) is fiber-reinforced plastic, refers generally to strengthen unsaturated polyester, epoxy resin and phenolic resin as matrix resin with glass fiber, is commonly called as glass fiber reinforced plastic.The FRP reinforcing technique has the advantages such as high-strength efficient, corrosion-resistant, durable, constructability, and important construction value and application prospect are widely arranged.

Experimental study and engineering practice show that externally bonded FRP reinforcement provides effective constraint to circular columns, but to the binding effect of rectangular column well below cylinder.This is because the distribution of FRP restraint stress is inhomogeneous in the rectangular column, only has the part core concrete to be subject to operative constraint.Therefore, if change first the rectangular column cross sectional shape into circle or ellipse (hereinafter to be referred as " circular arc "), with the FRP constraint, can obtain better effect again.For small size, among a small circle rectangular column (such as the used short column of experimental study) circular arc, can adopt methods such as pasting precast concrete block or artificial sand finish, but related column dimension, highly larger in practical engineering application, is installed comparatively difficulty at site operation; Expend in a large number manually, be not easy to control construction quality, consolidation effect is had adverse effect.

Development along with China's shipping industry, ships tonnage and traffic density increase, bridge is subject to the possibility that ship hits also to be increased, it is also more and more serious that bridge is subject to the consequence that ship hits, being subject to ship collision such as wuhan yangtze river one bridge since building up reaches more than 70 time, repeatedly repair, Guangdong Jiujiang Bridge in 2007 occurs to be hit collapse accident, causes great casualties.So, bridge is carried out shock resistance reinforce, should be subject to enough attention.

The utility model content:

The purpose of this utility model is: for the problem that prior art exists, proposes a kind ofly can to improve that the material reinforced concrete column utilization rate of FRP and anti-corruption superior performance, ductility are good, easy construction, FRP reinforcing circular arc elastic modulus of concrete post that shock resistance is good.

A kind of FRP that the utility model provides reinforces circular arc elastic modulus of concrete post, paste prefabricated circular-arc HDPE pipe concrete piece at the external surface of existing concrete post, form circular or oval-shaped circular arc concrete column, then twine on HDPE pipe concrete piece surface and paste the FRP band, obtain FRP and reinforce circular arc elastic modulus of concrete post.

Described prefabricated circular-arc HDPE pipe concrete piece is semicircle, half elliptic or circular arc HDPE pipe, fill concrete in the HDPE pipe.

Described existing concrete post is rectangular concrete column or circular concrete column.

Described winding is pasted the FRP band and is infiltrated to paste by resin and be wrapped in HDPE pipe concrete piece surface, machine direction along the band of column to.

Described FRP band is chosen the CFRP(carbon fiber according to Practical Project place environment, bearing capacity and cost requirement etc.), the AFRP(aramid fiber), the GFRP(glass fiber), the BFRP(basalt fibre), the circumferential tightening force of member and the distortion different and selected FRP material property of size requirements different variations in the engineering of the several factually border of winding layer.Twining the number of plies is 10～20 layers.

Above-mentioned HDPE thickness of pipe wall, sectional dimension are according to the circumferential tightening force of member in the Practical Project and the different and different variations of concrete column cross-sectional sizes of distortion size requirements.HDPE thickness of pipe wall 3-20mm.

It is different according to member anti-pressure ability in the Practical Project that HDPE manages inner fill concrete strength grade, adopts the different intensity grades concrete.Strength grade of concrete should be elected C25～C60 as;

The utility model is semicircle, half elliptic or the circular arc HDPE(high density polyethylene (HDPE) that adopts prefabricated inside fill concrete) pipe (being called for short " circular-arc HDPE pipe concrete piece "), be pasted on existing rectangular concrete column or circular concrete column surface, then adopt FRP cloth to be infiltrated to paste by resin and be wrapped in the HDPE(high density polyethylene (HDPE)) tube-surface, carry out reinforcement and strengthening to concrete column.

Compare with reinforcement of concrete post traditional in the prior art, the beneficial effects of the utility model are:

(1) mechanical property Effective Raise.After the reinforcement of concrete post, FRP cloth parcel HDPE pipe provides lateral restraint to concrete column, under the axial compression load action, and the concrete three dimension stress, the longitudinal cracking when having delayed pressurized can significantly improve concrete axial compressive strength and ductility.

(2) good integrity.Polythene material has good solderability, and outer subsides HDPE pipe is welded as a whole, and is conducive to improve the binding effect to concrete column.

(3) shock resistance is good.The polythene material resistance to impact is better, is applicable to be equally applicable to the place that bump accident occurs easily for other in the bridge engineering reinforcing of crashproof shock resistance requirement

(4) anti-seismic performance Effective Raise.The deformability of polythene material is very strong, under geological process, can consume a large amount of seismic energies, reaches the energy-dissipating and shock-absorbing effect, and especially being fit to has in the structural strengthening of shockproof requirements.

(5) economic benefit is given full play to.As a kind of comparatively reasonably structural strengthening form, after adopting semicircle or half elliptic HDPE pipe to the processing of rectangular concrete column circular arc, re-use the constraint of CFRP cloth parcel, greatly increase than the validity that directly rectangular column is retrained, make material obtain more abundant and rational application.

(6) easy construction.High density polyethylene pipe in the utility model is widely used in fields such as combustion gas conveying, water supply, heat supply, building water supply and drainages, has formed large-scale production, and customization is convenient; Can directly twine the FRP band that infiltrates resin at the HDFE pipe simultaneously, not need special surfacing, compare other reinforcing mode, simplify installation technology, save cost of labor.

Description of drawings:

Fig. 1～Fig. 2 is the prefabricated circular-arc HDPE concrete block cross sectional representation of the utility model, is formed by fill concrete in the prefabricated high density polyethylene pipe.

Wherein Fig. 1-be applicable to rectangular column is reinforced; Fig. 2-be applicable to circular columns reinforce.

Fig. 3～Fig. 5 is the utility model---FRP reinforces the cross-sectional view of circular arc elastic modulus of concrete post.

Wherein Fig. 3-rectangular column does not carry out chamfered; Fig. 4-be the sectional dimension that reduces to reinforce rear pillar, chamfered is carried out in the bight of original rectangular column; Fig. 5-circular columns is reinforced.

Number in the figure explanation: 1-HDPE pipe; The 2-fill concrete; 3-FRP band integument; 4-rectangular column; 5-circular columns.

The specific embodiment:

The structural representation of the utility model FRP reinforcing circular arc elastic modulus of concrete post is followed successively by FRP band integument, circular-arc high density polyethylene pipe concrete block, rectangular column as shown in Figure 2 from outside to inside, and the implementation step is as follows:

(1) actual according to engineering, the curvature of design concrete column circular arc, the wall thickness of choose reasonable HDPE pipe and sectional dimension;

(2) fill concrete in prefabricated HDPE pipe is made circular-arc HDPE pipe concrete piece, and strength grade of concrete should be elected C25～C60 as;

(3) suitable processing is carried out on the concrete column surface, removed deteriorated, loose concrete, select suitable alignment material to repair levelling;

(4) prefabricated circular-arc HDPE pipe concrete piece is pasted on the concrete column surface with binding material (as: epoxy resin);

(5) infiltrate to be pasted by resin with FRP cloth and be wound in HDPE pipe concrete piece surface, twining the number of plies is 10～20 layers, machine direction along the band of column to, finish reinforcing.

Claims

1. a FRP reinforces circular arc elastic modulus of concrete post, it is characterized in that: paste prefabricated circular-arc HDPE pipe concrete piece at the external surface of existing concrete post, form circular or oval-shaped circular arc concrete column, then twine on HDPE pipe concrete piece surface and paste the FRP band, obtain FRP and reinforce circular arc elastic modulus of concrete post.

2. FRP according to claim 1 reinforces circular arc elastic modulus of concrete post, it is characterized in that: described prefabricated circular-arc HDPE pipe concrete piece is semicircle, half elliptic or circular arc HDPE pipe, fill concrete in the HDPE pipe.

3. FRP according to claim 1 reinforces circular arc elastic modulus of concrete post, and it is characterized in that: described existing concrete post is rectangular concrete column or circular concrete column.

4. FRP according to claim 1 reinforces circular arc elastic modulus of concrete post, it is characterized in that: the winding number of plies that the FRP band is pasted in described winding is 10～20 layers, machine direction along the band of column to.