CN1896436A

CN1896436A - Fibre-reinforced plastic steel twisting-wire composite rib

Info

Publication number: CN1896436A
Application number: CN 200610009936
Authority: CN
Inventors: 欧进萍; 张志春; 周智; 王川
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2006-04-19
Filing date: 2006-04-19
Publication date: 2007-01-17
Anticipated expiration: 2026-04-19
Also published as: CN100390369C

Abstract

This invention is fiber reinforced plastics-steel strand composite reinforcement. It includes thin steel strand or super-thin high strength steel wire bundle, enveloped with fiber reinforced plastics integument. This invention uses the characters of steel strand and FRP materials and produces a kind of new type FRP-steel strand composite reinforcement. It is light and has high strength and high modulus. It is also corrosion preventive and has high extensibility. This invention is safe and reliable replacing materials of steels in the civil engineering structure such as steel reinforced concrete and bridge anchor line.

Description

Fibre-reinforced plastic steel twisting-wire composite rib

(1) technical field

What the present invention relates to is a kind of civil engineering structural meterials.Specifically a kind of have good mechanics and the fibre reinforced plastics of durability index (FRP)-steel twisting-wire composite rib in civil engineering structure.

(2) background technology

Fibre reinforced plastics hereinafter to be referred as FRP, are the composite materials of forming with continuous fiber.This continuous fiber at first is immersed in the polymer that is used for binder fibre, is processed into needed shape then.According to the difference of kinds of fibers, fibre reinforced plastics can be divided into carbon fibre reinforced plastic, glass fiber reinforced plastics, basalt fibre reinforced plastic and aromatic polyamide fiber reinforced plastics and mix reinforced plastic etc.Fibre reinforced plastics have tensile strength height, in light weight, corrosion-resistant, nonmagnetic, endurance, easy good characteristic such as processing.Wherein, the fibre reinforced plastics bar can be made the shape of plain bars, is considered to a kind of possible substitution material of reinforcing bar; For the FRP rod of light face, can replace steel strand or high tensile steel wire in the bridge cable.Fibre reinforced plastics are suitable for the demanding important engineering structuress in aspect such as Service Environment, durability, antifatigue as a kind of novel constructional materials that development potentiality is arranged, as underground structure, ocean engineering, and hydraulic engineering etc.Set up fibre reinforced plastics research association in developed countries such as the U.S., Japan, Canada at present, tentatively formulated the standard of structure design, and be successfully used to actual engineering.

For the FRP material of various fibers, except the modulus big (similar with steel) of carbon fiber, other modulus is less.Because various fibre reinforced plastics all are the linear elasticity materials, do not surrender in its destructive process simultaneously, mode of failure is a brittle fracture, does not have omen thereby caused in use to destroy, and has reduced the safety that this material uses.In concrete work, use to have only and to improve the security performance of structure, but caused the waste of material like this by the overreinforced design.In addition, utilize the fiber of multiple different modulus and limit elongation to mix the modulus and the ductility problem that can improve the FRP material, but for assorted fibre FRP material, its offset procedure is that the inefficacy with the part fiber realizes, cause its possibility that brittle fracture takes place in this section process very big, very dangerous like this.

So the FRP material has broad application prospects in the building industry with the advantage of himself.Because himself, also restricted its application in civil engineering to a certain extent simultaneously.

(3) summary of the invention

The deficiency of the FRP muscle that solo fibre causes the object of the present invention is to provide a kind of can remedying, owing to can substitute reinforcing bar or the steel strand fibre-reinforced plastic steel twisting-wire composite rib as primary structure member.

The object of the present invention is achieved like this: it comprises the thin steel strand or the ultra-fine high-strength steel tow of core, externally parcel form to the fibre reinforced plastics integument.

The present invention can also comprise some architectural features like this:

1, the surface of fibre reinforced plastics integument has the rib of similar reinforcing bar.

2, the surface of fibre reinforced plastics integument is smooth clavate.

3, described fibre reinforced plastics are a kind of in carbon fibre reinforced plastic, glass fiber reinforced plastics, basalt fibre reinforced plastic or the aromatic polyamide fiber reinforced plastics.

Basic principle of the present invention is according to FRP material design principle, and in fibre reinforced plastics (FRP)-steel twisting-wire composite rib, the steel wire bundle of core is to enter mould with other outer parcel fibers, through heat-treating profiled technology, makes it into as a whole.Because the steel strand of core are fixed good with outside FRP material, make its cooperative transformation together.Its elastic strain is about 1% for steel strand, and the limiting strain of general fiber is 2～3%.Therefore this muscle experiences following three phases and is in the process of tension: reached before 1% in strain, according to the FRP mixed principle, and both compositely proportionals, steel strand and fiber are born load jointly, the modulus of elasticity of this muscle is between steel strand and fiber, and this section is an elastic stage; Along with the increase of strain, before the limiting strain that reaches fiber, because the generation of steel strand surrenders, thereby cause the reduction of this muscle modulus of elasticity, thereby produced the characteristic that is similar to surrender.This stage is the surrender section of this muscle, and this stage does not have the destruction of fiber, also is that steel strand and fiber are born load jointly, so this process is security process, and CYCLIC LOADING can not cause the reduction of whole mechanical property simultaneously.This also is this muscle and the maximum difference that mixes the FRP muscle.In case strain surpasses the limiting strain of fiber, fiber begins fracture, and fiber is deactivated, and load redistributes on the steel strand, is finally broken end with steel strand.Because this muscle moulding proportioning is a recombination process, therefore the mechanical property of this muscle can design, and the theory that mixes according to the FRP muscle causes the fiber isotropic modulus difference according to the kinds of fibers difference, adjust the proportioning of steel strand and fiber, can produce the muscle material of different mechanical properties.This specific admixture muscle has overcome that simple FRP material modulus is low, ductility is poor, surrender section and cause poor stability and the high shortcoming of cost, has inherited the advantage of FRP muscle lightweight, high-strength and high-durability simultaneously.Therefore this kind fibre reinforced plastics (FRP)-steel twisting-wire composite rib is the desirable substitution material of reinforcing bar, steel strand, becomes civil engineering structure material of new generation.

(4) description of drawings

Fig. 1 is the structural representation of embodiment of the present invention;

Fig. 2 is the left view of Fig. 1.

(5) specific embodiments

For example the present invention is done more detailed description below in conjunction with accompanying drawing:

In conjunction with Fig. 1 and Fig. 2, the structure of fibre reinforced plastics (FRP)-steel twisting-wire composite rib is formed and is comprised unidirectional FRP material integument 1, the thin steel wire bundle 2 of core.Product of the present invention can adopt such method to make: with thin steel wire bundle and the fiber that soaks into resin, as carbon fiber, glass fiber, basalt fibre and aramid fiber etc., according to certain ratio, send into drawing mould together, according to the difference of resin, according to different moulding process type moulding.Moulding finishes the back steel strand and outer FRP material organically is consolidated into one.This product is according to the difference of using, and its surface can be the light face, is mainly used in rope class formations such as making bridge cable; The rib of similar reinforcing bar is produced on its surface, improved and concrete bond-anchorage, be used for the reinforced-concrete structure.

Described core is the thin steel strand of multi beam, for the cementation that increases itself and outer wrapping layer FRP material can be adopted ultra-fine high-strength steel tow.

Described outer wrapping FRP layer is the unidirectional fibre trend.Its effect has two kinds, and the one, bear load action, the 2nd, the protection core avoids corrosion.Optionally kinds of fibers has glass fiber, carbon fiber, basalt fibre and aramid fiber etc.

The proportioning of described core and parcel FRP layer will be as requested mechanical performance index, mix theory according to the FRP material and carry out proportioning and calculate.

The foundation that described kinds of fibers is selected is that mechanical performance index, the environment for use of this muscle requires and cost.The selecting for use of low modulus fiber can be caused the reduction of the whole modulus of this muscle; For the reinforcing rib in the concrete work, glass fiber select the reduction that can cause this muscle endurance quality for use; Though high fiber select the performance that can improve this muscle to a certain extent for use, increased its cost.Therefore, carry out comprehensive fiber according to aspects such as mechanical property requirements, environment for use and costs selects for use.

The resin of described outer field FRP integument can be thermosetting or thermoplasticity, wherein thermosetting resin select the whole mechanical property that can improve this muscle for use, but make this muscle not possess the hot worked ability of secondary; Select for use thermoplastic resin to bend the needs of more suitable certain engineering so that carry out secondary hot-working.

In concrete work,, rib is produced on its surface in order to improve this muscle and concrete bonding; And be ganoid bar for the drag-line muscle.

Claims

1, a kind of fibre reinforced plastics-steel twisting-wire composite rib is characterized in that: it comprises the thin steel strand or the ultra-fine high-strength steel tow of core, externally parcel form to the fibre reinforced plastics integument.

2, fibre reinforced plastics-steel twisting-wire composite rib according to claim 1 is characterized in that: the surface of fibre reinforced plastics integument has the rib of similar reinforcing bar.

3, fibre reinforced plastics-steel twisting-wire composite rib according to claim 1 is characterized in that: the surface of fibre reinforced plastics integument is smooth clavate.

4, according to claim 1,2 or 3 described fibre reinforced plastics-steel twisting-wire composite ribs, it is characterized in that: described fibre reinforced plastics are a kind of in carbon fibre reinforced plastic, glass fiber reinforced plastics, basalt fibre reinforced plastic or the aromatic polyamide fiber reinforced plastics.