CN201649444U

CN201649444U - Novel prestressed composite FRP reinforcing bar

Info

Publication number: CN201649444U
Application number: CN2010201731961U
Authority: CN
Inventors: 杨勇; 邓宇; 张鹏; 薛建阳
Original assignee: Xian University of Architecture and Technology; Guangxi University of Science and Technology
Current assignee: Xian University of Architecture and Technology; Guangxi University of Science and Technology
Priority date: 2010-04-28
Filing date: 2010-04-28
Publication date: 2010-11-24
Anticipated expiration: 2020-04-28

Abstract

The utility model relates to a novel prestressed composite FRP (fiber-reinforced plastic) reinforcing bar used for bridges, water conservancy projects, sea ports and other concrete structures. The FRP reinforcing bar comprises a high-strength concrete prism body and an FRP reinforcing bar, wherein the FRP reinforcing bar is embedded in the high-strength concrete prism body; rib marks are arranged on the two side surfaces of the high-strength concrete prism body and adopt either vertical rib marks perpendicular to the bottom surface of the high-strength concrete prism body or inclined rib marks, and the included angle Alpha between the inclined rib marks and the bottom surface of the high-strength concrete prism body ranges from 30 DEG to 60 DEG; and the FRP reinforcing bar adopts a CFRP (carbon fiber reinforced plastic) reinforcing bar, a GFRP (glass fiber reinforced plastic) reinforcing bar, a BFRP (boron fiber reinforced plastic) reinforcing bar, or an AFRP (aramid fiber reinforced plastic) reinforcing bar. Compared with the common FRP-reinforced concrete, the utility model has the advantages of slower crack expansion, smaller crack width, higher rigidity, strength and drawability of constructional elements, full use of FRP materials, etc; and compared with the common prestressed FRP reinforcing bar, the novel prestressed composite FRP reinforcing bar has the advantages of convenient construction, higher drawability and the like due to the availability for batch prefabrication.

Description

The compound muscle of new type FRP prestressing force

Technical field

The utility model relates in the concrete structures such as a kind of bridge, hydraulic engineering and sea port dock with the compound muscle of new type FRP prestressing force.

Background technology

The corrosion of prestressed reinforcement and plain bars in the concrete structures such as bridge, hydraulic engineering, sea port dock is domestic and international civil engineering field problem of being concerned about and the challenge that faces always.Use the area of ice-removal salt and the area of bordering on the sea in the winter time in a large number, this type of problem is particularly outstanding.Existing engineering practice shows, is the required reinforcing of the normal functional performance that keeps structure and the maintenance cost several times of the cost of structure normally own.

How improving the durability of reinforced concrete structure, the application life that increases them is problem extremely urgent in the civil engineering.Be head it off, people have carried out multiple trial, the Chinese scholars countermeasure that just begun one's study from the sixties in 20th century, and through the exploration and practice of nearly half a century, having developed fibre reinforced plastics (Fiber Reinforced Plastic) is FRP.FRP has tensile strength height, in light weight, self-diagnostic feature, nonmagnetic and do not have a good characteristic such as corrosion row, and the FRP bar can be made the shape of plain bars, thereby the FRP muscle is considered to a kind of good substitution material of prestressed reinforcement and plain bars in the prestressed reinforced concrete construction, becomes at present one of research focus of field of civil engineering both at home and abroad.At present, existing in the world many countries and regions are applied to the FRP muscle in the civil engineering, especially in some adverse circumstances, FRP has demonstrated wide application prospect, and therefore the Study on behavior to the FRP tendon concrete structure has important in theory meaning and real value.

Most fibrous material is compared the tensile strength height with steel, modulus of elasticity is low.Because modulus of elasticity is low, during FRP reinforced concrete flexural member cracking, the member section natural axis rapid on move, cause stiffness of structural member to reduce, companion's and be the reduction of member amount of deflection and the increase of crack width.The quantity of reinforcement that increases the FRP muscle in cross section is to improve the member amount of deflection, satisfies the safety requirements of design specifications.Yet this will mean that FRP muscle use cost is too high.In addition, the sectional reinforcement rate is too high, and the high-tensile characteristics of FRP muscle can not fully be utilized in design.

The utility model content

The technical problems to be solved in the utility model is: provide a kind of have delay crack developing, reduce crack width, improve stiffness of structural member, increase component strength, improve member ductility and make full use of the compound muscle of new type FRP prestressing force of advantages such as FRP material, to solve the weak point that exists in the above-mentioned present technology.

The technical scheme that solves the problems of the technologies described above is: the compound muscle of a kind of new type FRP prestressing force, comprise high-strength concrete prism and FRP muscle, and the FRP muscle is imbedded in the high-strength concrete prism, and high-strength concrete prism two sides also are provided with the rib line.

Described rib line or the perpendicular rib line vertical or form the diagonal rib line of 30～60 ° of angle α with high-strength concrete prism bottom surface with high-strength concrete prism bottom surface.

Described FRP muscle is CFRP muscle, GFRP muscle, BFRP muscle or AFRP muscle.

A kind of novel pre-stressed FRP muscle technology that the utility model is invented in order effectively to utilize pre-stress FRP reinforced concrete excellent performance advantage and convenient construction just, the compound muscle of new type FRP prestressing force (also can be described as the compound muscle of FRP-PCPs) is meant heeling-in pre-stress FRP muscle in the less high-strength concrete prism (PCPs) in cross section, after treating that concrete reaches design strength, pre-stress FRP muscle and high-strength concrete prism have been combined to form the less compound muscle of new type FRP prestressing force that is suitable for axial tension of sectional dimension mutually.The compound muscle of this new type FRP prestressing force can be used as principal rod and directly builds tensile zone in various concrete components (beam, plate etc.), has promptly formed a kind of new type FRP prestressed concrete member---the compound muscle structure of new type FRP prestressing force.

Compare with common FRP reinforced concrete, the utlity model has and delay crack developing, reduce crack width, improve stiffness of structural member, increase component strength, improve member ductility and make full use of advantages such as FRP material, simultaneously because the compound muscle of new type FRP prestressing force can be prefabricated in batches, compare with common pre-stress FRP muscle, the compound muscle of new type FRP prestressing force also has advantages such as easy construction and ductility is better, and because the compound muscle of new type FRP prestressing force can carry out prefabrication and customization, the fabricating quality of compound muscle and mechanical property can obtain strict control.Be provided with the rib line in high-strength concrete prism two sides, having increased by two side rib lines can increase the roughness coefficient of FRP-PCPs muscle and surrounding concrete, improve the frictional force between the concrete, thus the cracking resistance ability of having strengthened the adhesion strength of the compound muscle of new type FRP prestressing force and surrounding concrete and having improved the compound rib component of new type FRP prestressing force with.Therefore, the compound muscle of new type FRP prestressing force of the utility model has good Research Significance and popularizing application prospect as a kind of innovation structure technology in conjunction with new material and prestressing technique.

Because the compound muscle of new type FRP prestressing force has above-mentioned advantage, the utility model has the applications well prospect in following range of application: (1) is used for the bridge deck of newly-built concrete-bridge; (2) be used for the bridge floor beam of newly-built concrete-bridge; (3) the compound muscle of new type FRP prestressing force is embedded in (NSM) reinforced concrete bridge deck, the bridge floor beam on the top layer as embedding muscle; (4) be used for the newly-built and stabilization works that other needs the concrete beam board member of increased durability.Wherein, because in concrete slab, need not stirrup, only join the vertical muscle of unidirectional tension, to characteristics such as be subjected to that lacing wire durability and fatigue behaviour are had relatively high expectations, adopt the compound muscle of new type FRP prestressing force to indulge the performance advantage that the compound reinforced concrete bridge deck of the formed new type FRP prestressing force of muscle can have been given play to the compound muscle of new type FRP prestressing force fully, in China's cold district and equal tool wide application prospect of the coastal south and promotional value as tension in the bridge deck.

Below, the technical characterictic to the compound muscle of new type FRP prestressing force of the utility model is further described in conjunction with the accompanying drawings and embodiments.

Description of drawings

Fig. 1～Fig. 3: the utility model embodiment one structural representation:

Fig. 1: stereogram, Fig. 2: front view, Fig. 3: right view.

Fig. 4～Fig. 6: the utility model embodiment two structural representations:

Fig. 4: stereogram, Fig. 5: front view, Fig. 6: right view.

Among the figure:

The 1-FRP muscle, 2-high-strength concrete prism, 31-erects rib line, 32-diagonal rib line.

The specific embodiment

Embodiment one:

The compound muscle of a kind of new type FRP prestressing force is (referring to Fig. 1～Fig. 3), comprise high-strength concrete prism 2 and FRP muscle 1, FRP muscle 1 is imbedded in the less high-strength concrete prism 2 in cross section, and high-strength concrete prism two sides also are provided with the perpendicular rib line 31 vertical with high-strength concrete prism bottom surface.

Embodiment two:

The compound muscle of a kind of new type FRP prestressing force is (referring to Fig. 4～Fig. 6), comprise high-strength concrete prism 2 and FRP muscle 1, FRP muscle 1 is imbedded in the less high-strength concrete prism 2 in cross section, and high-strength concrete prism two sides also are provided with the diagonal rib line 32 that forms 46 ° of angle α with high-strength concrete prism bottom surface.

Do a kind of conversion of present embodiment two, the angle of described angle α can or reduce according to the actual conditions increase, is generally 30～60 °.

The described FRP muscle of each embodiment of the utility model can be CFRP muscle (carbon fibre bar), GFRP muscle (glass fiber muscle), BFRP muscle (basalt fibre muscle) or AFRP muscle (aramid fiber reinforced plastic bars), and the diameter of FRP, prestressing force level are determined according to the actual loading of primary structure member.The utility model sectional dimension is determined according to the engineering actual conditions.

Claims

1. compound muscle of new type FRP prestressing force, it is characterized in that: comprise high-strength concrete prism and FRP muscle, the FRP muscle is imbedded in the high-strength concrete prism, and high-strength concrete prism two sides also are provided with the rib line.

2. the compound muscle of new type FRP prestressing force according to claim 1 is characterized in that: described rib line or the perpendicular rib line vertical with high-strength concrete prism bottom surface or form the diagonal rib line of 30～60 ° of angle α with high-strength concrete prism bottom surface.

3. the compound muscle of new type FRP prestressing force according to claim 1 and 2 is characterized in that: described FRP muscle is CFRP muscle, GFRP muscle, BFRP muscle or AFRP muscle.