CN103669725A - Hybrid FRP (fiber reinforced plastic) pipe high-strength reinforcing steel bar active powder concrete column and preparation method thereof - Google Patents

Abstract

The invention discloses a hybrid FRP (fiber reinforced plastic) pipe high-strength reinforcing steel bar active powder concrete column and a preparation method thereof and belongs to the field of buildings. The hybrid FRP pipe high-strength reinforcing steel bar active powder concrete column comprises a hybrid FRP pipe and active powder concrete in the hybrid FRP pipe, wherein stirrups and longitudinal high-strength reinforcing steel bars are arranged in the active powder concrete in the hybrid FRP pipe; the stirrups are wound on the longitudinal high-strength reinforcing steel bars to form a reinforcing steel bar cage; a gap is reserved between the reinforcing steel bar cage and the hybrid FRP pipe; compared with the conventional steel pipe high-strength concrete combined column and the single fiber FRP pipe high-strength concrete, the component provided by the invention has the advantage that the bearing capacity, the deformation capacity, the anti-seismic capacity and the durability can be improved. The hybrid FRP pipe high-strength reinforcing steel bar active powder concrete column and the preparation method thereof are applicable to the technical field of concrete combined column structures, can be used for new building structures and can also be used for a reinforcing and hoisting project of the active powder concrete combined column.

Description

Mix FRP pipe high tensile reinforcement reactive powder concrete column and preparation method

Technical field

The present invention relates to specific admixture FRP pipe high tensile reinforcement RPC (RPC) coupled column and a preparation method, be applicable to concrete combination column technical field of structures, belong to building field.

Technical background

FRP pipe adopts wet winding technology, by traction wheel, the continuous fiber tow after mylar soaks is guided on dolly, make fiber and mandrel overlap joint, along with core rotates, dolly moves back and forth, and fibre is evenly covered with mandrel surface, by computer control Filament-wound Machine angle, guarantee that Filament-wound Machine is not overlapping, gap not, the FRPGuan factory making is cut into the length of appointment.

FRP pipe constraint RPC, has formed a kind of Novel combined column: mix FRP pipe reactive powder concrete column.

RPC is comprised of cement, quartz sand, silica flour, high efficiency water reducing agent etc., is after high-strength, high performance concrete, a kind of high strength of developing, high tenacity, high durable super high strength concrete.Its basic preparation principle is: by improving the fineness and defect active, that farthest reduce material internal of component, to obtain superhigh intensity and high-durability.But the RPC fragility of not mixing micro steel fiber is large, deformability is poor, under heavily stressed or complicated applied force state, easily produce burst brittle fracture, its safety reduces greatly.Mix fiber, although improved to a certain extent the toughness of RPC, fragility is still larger, has affected its application in Practical Project.For solving the problem that RPC deformability is not enough, brittle fracture easily occurs, Chinese scholars adopts steel tube confinement RPC, improves ductility, prevents that RPC from brittle fracture occurring.But because the poisson's ratio of steel is greater than the initial poisson's ratio of RPC, thus Steel Pipe Reactive Powder Concrete member at the loading initial stage, restraint forces is little, occurs the phenomenon of the disengaging of RPC and steel pipe.

The problem existing in order to overcome steel tube confinement RPC, people propose the mentality of designing of single FRP constraint RPC, although retrain RPC with single FRP, have improved toughness and bearing capacity, due to the stretching of single FRP-be deformed into straight line, destruction belongs to fragility, destroys suddenly.

The FRP that adopts assorted fibre to prepare, there is pseudo-yield phenomenon, there is strain hardening feature, multistage ductile fracture, ductility high, be similar to the surrender that steel are the same, and there is strain hardening feature, the deficiency that can overcome single FRP constraint RPC, has realized not only and can improve columns bearing capacity, deformability, and can improve coupled column durability.If with mixing the single FRP of FRP pipe belt, RPC is poured into mix in FRP pipe and form and mix FRP pipe RPC member, mix FRP pipe and not only can more effectively retrain inner RPC, prevent that RPC from brittle fracture occurring, significantly improve its deformation performance, and can improve structure durability; Compare steel pipe RPC, FRP pipe RPC deadweight reduces.Mix in addition FRP constraint RPC and can adjust assorted fibre kind, ratio and winding direction according to designer's intention, performance mixes the binding effect of FRP to greatest extent, and modulus of elasticity, poisson's ratio, intensity and restraint forces, the deformability etc. of FRP are prepared according to designing requirement.Mixing FRP pipe can just retrain inner RPC effectively at the loading initial stage.Meanwhile, FRP pipe can also, as the protecting sheathing of RPC, improve structure durability.Therefore, mix FRP pipe reactive powder concrete column than steel pipe reactive powder concrete column and single FRP constraint RPC post, there is higher intensity, better deformation performance and anti-seismic performance, can be used under the adverse environments such as salinity is large, humidity is high.

Mixing FRP pipe concrete member is a kind of very rational structural element, peripheral mix FRP pipe and both can effectively retrain core concrete, improves bearing capacity ability; Can protect core RPC again, improve structure durability; Template in the time of can also being used as construction, accelerates speed of application, the reduction of erection time.

Mix FRP pipe reactive powder concrete column and there is feature: RPC is a kind of super Materials with High Strength; In addition, mix FRP pipe core RPC is produced to constraint, make core RPC in triaxial stress state, more strengthened the bearing capacity of member.FRP pipe is the protecting sheathing of core RPC, and FRP pipe has good corrosion resistance, and FRP pipe RPC member can be used under the adverse environments such as salinity is large, humidity is high, thereby has solved the etching problem of concrete filled steel tubular member.Mix FRP pipe and not only there is extremely strong cuff effect, and there is good deformation performance, can significantly reduce the fragility of core RPC, deformability and the energy dissipation capacity of RPC have significantly been improved, increase substantially ductility and the hysteretic characteristic of post, make to mix FRP pipe reactive powder concrete column and there is good anti-seismic performance.

Therefore, mix FRP pipe reactive powder concrete column and combine the advantage that mixes FRP pipe concrete column and the active concrete column of steel pipe, there is very high bearing capacity, good deformation performance and decay resistance, will be in engineerings such as bridge, super highrise building, large-span structures, or at marine environment, be subject to there is application value in the Structural Engineering of chemical attack.

Mixing FRP pipe RPC coupled column is RPC and the combination that mixes FRP pipe.Mix FRP pipe and make core RPC in triaxial stress state, thereby improve concrete strength, distortion, prevent that RPC from brittle fracture occurring.Mix FRP pipe constraint and not only can improve Combined concrete columns bearing capacity and durability, and good the mixing FRP pipe and can improve post ductility and energy dissipation of ductility.Mix FRP pipe RPC coupled column and can, for newly-built structure, also can promote engineering for the reinforcing to concrete combination column.

Summary of the invention

The object of the present invention is to provide a specific admixture FRP pipe high tensile reinforcement RPC post, this member is compared with conventional steel high-strength concrete coupled column, Single Fiber FRP pipe RPC post, can improve bearing capacity, deformability and anti-seismic performance.

For achieving the above object, the present invention has taked following technical scheme:

The present invention includes and mix FRP pipe and be filled in the RPC mixing in FRP pipe.

Described mixing is provided with stirrup and longitudinal high tensile reinforcement, the preferred HRB500 of high tensile reinforcement or HRB600 in the RPC in FRP pipe; Stirrup is wrapped in that longitudinal high tensile reinforcement is outer forms a reinforcing steel bar cage, and reinforcing steel bar cage has space with mixing between FRP pipe, preferably reinforcing steel bar cage with mix FRP and manage parallel coaxial.

Described mixes FRP pipe for adopting fibre cloth winding around being prepared from, and mixes the preferred multiple cloth formation interlayer of FRP pipe and mixes.Cloth is two-way cloth.Two-way cloth angle is multiple.

The preferred two-way carbon cloth of cloth, aryl fiber cloth, high strength glass fiber sheet, basalt fiber cloth.Further preferred internal layer is carbon fiber, and skin is aramid fiber.

Described concrete column body section be shaped as circular (see figure 1), oval (see figure 2).

The preparation method who mixes FRP pipe high tensile reinforcement reactive powder concrete column, concrete making step comprises as follows:

1) according to designing requirement, with winding process, in factory, prepare and mix FRP pipe;

2) using FRP pipe as template;

3) the good stirrup of colligation is put into FRP pipe with the reinforcing steel bar cage that longitudinally high tensile reinforcement forms;

4) in pipe, build RPC, and carry out maintenance.

Mix FRP pipe reactive powder concrete column and inherited and integrated RPC and the advantage that mixes the constraint of FRP pipe:

In this coupled column, adopt and mix FRP pipe confined concrete; built-in high tensile reinforcement; improve pillar bearing capacity, ductility and energy dissipation; and assorted fibre pipe binding effect is better than Single Fiber FRP pipe; the outer field FRP of the mixing pipe of member has protective effect to member; extend concrete durability, thereby increased the service life of member.

Mix FRP pipe RPC coupled column by mixing the reasonably combined of FRP, RPC and high tensile reinforcement, take full advantage of the performance of various types of materials, increased the utilization rate of material.

Accompanying drawing explanation

Fig. 1 circle mixes FRP pipe constraint reactive powder concrete column schematic diagram;

Fig. 2 ellipse mixes FRP pipe reactive powder concrete column schematic diagram;

The schematic cross-section of Fig. 3 embodiment 1;

The sectional schematic diagram of Fig. 4 embodiment 1;

The schematic cross-section of Fig. 5 embodiment 2;

The sectional schematic diagram of Fig. 6 embodiment 2.

The specific embodiment

Below in conjunction with accompanying drawing, the invention will be further described:

Embodiment 1:

Existing the invention will be further described: first according to the preparation of designing requirement factory, mix FRP pipe; Colligation longitudinal reinforcement and stirrup, put into FRP pipe by the good reinforcing steel bar cage of colligation, in FRP pipe, builds RPC.

Cylinder in the present embodiment adopts the cylinder of diameter 350mm, and cylinder length is 2.1m.

8 vertical muscle of HRB500, diameter 20mm, arranges along even circumferential.The spacing 200mm of spiral stirrup, diameter 8mm.

RPC compressive strength 150MPa.

3 layers mix FRP material and form and to mix FRP pipe, and promiscuous mode is that interlayer mixes, and wraps up from inside to outside 1 layer of carbon cloth, 1 layer of glass fabric and 1 layer of aryl fiber cloth, and schematic cross-section is shown in Fig. 3, and sectional schematic diagram is shown in Fig. 4.Carbon cloth thickness 0.167mm wherein, tensile strength 4420MPa, modulus of elasticity 2.0 * 10 ⁵mPa, elongation per unit length 1.7%; The thick 0.21mm of aryl fiber cloth, tensile strength 3420MPa, modulus of elasticity 1.8 * 10 ⁵mPa, elongation per unit length 2.9%; Glass fabric thickness 0.18mm, tensile strength 3000MPa, modulus of elasticity 0.51 * 10 ⁵mPa, elongation per unit length 3.2%.

Cloth winding angle is+55 °.

FRP pipe thickness is 40mm.

Adopt material and the member of example 1, under bending, mix the bearing capacity of FRP pipe constraint RPC with respect to single glass fibre pipe, improve 52.8%, bending resistance deformability improves 179.6%.

Embodiment 2:

Except mixing FRP pipe, be different from embodiment 1, all the other are identical.See Fig. 5 and 6.

4 specific admixture fibers form and mix FRP pipe, and promiscuous mode is that interlayer mixes, and are followed successively by from inside to outside 1 layer of carbon cloth of parcel, 1 layer of basalt fibre, 1 layer of glass fabric and 1 layer of aryl fiber cloth.Carbon fiber thickness 0.2mm wherein, tensile strength 4420MPa, modulus of elasticity 2.0 * 10 ⁵mPa, elongation per unit length 1.7%; Aryl fiber cloth 0.22mm, tensile strength 3420MPa, modulus of elasticity 1.8 * 10 ⁵mPa, elongation per unit length 2.9%; Basalt fibre thickness 0.22mm, tensile strength 2420MPa, modulus of elasticity 1.0 * 10 ⁵mPa, elongation per unit length 2.4%; Glass fabric thickness 0.18mm, tensile strength 3000MPa, modulus of elasticity 0.51 * 10 ⁵mPa, elongation per unit length 3.2%.

Cloth winding angle is+55 °.

FRP pipe thickness is 40mm.

Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.

Claims (6)

1. mix FRP pipe high tensile reinforcement reactive powder concrete column, it is characterized in that, comprise and mix FRP pipe and be filled in the RPC mixing in FRP pipe;

Described mixing is provided with stirrup and longitudinal high tensile reinforcement in the RPC in FRP pipe, stirrup is wrapped in that longitudinal high tensile reinforcement is outer forms a reinforcing steel bar cage, reinforcing steel bar cage and mix between FRP pipe and have space;

Described mixes FRP pipe for adopting two-way fibre cloth winding around being prepared from, and mixes the preferred multiple cloth formation interlayer of FRP pipe and mixes; Cloth is two-way cloth, the preferred two-way carbon cloth of cloth, aryl fiber cloth, high strength glass fiber sheet, basalt fiber cloth.

2. according to the FRP that mixes of claim 1, manage high tensile reinforcement reactive powder concrete column, it is characterized in that, internal layer is carbon cloth, and skin is aryl fiber cloth.

3. according to the FRP that mixes of claim 1, manage high tensile reinforcement reactive powder concrete column, it is characterized in that the preferred HRB500 of high tensile reinforcement or HRB600.

According to claim 1 mix FRP pipe high tensile reinforcement reactive powder concrete column, it is characterized in that, preferably reinforcing steel bar cage with mix FRP pipe parallel coaxial.

According to claim 1 mix FRP pipe high tensile reinforcement reactive powder concrete column, it is characterized in that, described concrete column body section be shaped as circle, ellipse.

6. any method that mixes FRP pipe high tensile reinforcement reactive powder concrete column described in preparation claim 1-5, is characterized in that, comprises as follows:

1) according to designing requirement, with winding process, prepare and mix FRP pipe;

2) will mix FRP pipe as template;

3) the good stirrup of colligation is put into FRP pipe with the reinforcing steel bar cage that longitudinally high tensile reinforcement forms;

4) in pipe, build RPC, and carry out maintenance.

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