CN2911057Y

CN2911057Y - Concrete beam having partially bond prestressed FRP bars

Info

Publication number: CN2911057Y
Application number: CN 200620040250
Authority: CN
Inventors: 薛伟辰; 张蜀泸
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2006-03-16
Filing date: 2006-03-16
Publication date: 2007-06-13
Anticipated expiration: 2016-03-16

Abstract

Partial bonding prestressed fiber reiforced plastic(FRP) concrete beam which comprises a concrete beam, a prestressed FRP reiforcement,a non-prestressed reiforcement, a stirrup, an anchorage device, a bellow,a grouting material, a casing and a head plate. The arrangement of non-prestressed reiforcement and the stirrup in the beam is the same as the common reinforced concrete.The the prestressed FRP reinforcement and the concrete adopt the form of unbonded structure in the medium section of the beam span;the bonding structure is adopted at end of the beam with the concrete. The prestressed FRP reinforcement is penetrated into the casing at the unbonded section and the both ends of the casing are sealed with the head plate then is positioned into the bellow. The prestressed FRP reinforcement is directly placed into the bellow at the bonding section. After the pouring concrete achieves certain compressive strength, the prestressed FRP reinforcement should be stretched and the grouting material should be poured into the bellow thus to partially form unbonded structure in the casing and partially form bonding structure out of the casing by prestressed reinforcement and the concrete.

Description

Part binding prestress compo (FRP) reinforced concrete beam

Technical field

The utility model relates to the concrete beam in the field of civil engineering, and the prestressing force that is specifically related to part bonding between a kind of FRP muscle and the concrete is subjected to camber beam.

Background technology

Traditional reinforced concrete structure, because building is in the exposure property environment for a long time, reinforcing bar can produce corrosion, when especially being on the verge of erosion environment condition such as sea port dock when building, the corrosion problem of reinforcing bar is even more serious.For thoroughly addressing this problem, present a kind of new method is to adopt the FRP muscle to replace reinforcing bar.Compare with reinforcing bar, the FRP muscle has characteristics such as tensile strength height, corrosion resistance is good, modulus of elasticity is low, proportion is little, can give full play to its high-intensity advantage in prestressed reinforced concrete construction; But the stress-strain relation of FRP muscle all presents linear elasticity before destroying, these are different with the reinforcing steel bar bear performance with clear and definite surrender step, make pre-stress FRP reinforced concrete member not have manifest signs before destruction, and the ductility of member is poor.

The FRP muscle is applied to concrete beam, adopts complete bonded prestress concrete beam or complete two kinds of form of structure of no-bonding pre-stress concrete beam usually; Experimental study shows: though bonded prestress FRP reinforced concrete beam has advantages of high bearing capacity fully, but its distortion and ductile performance are relatively poor; Compare with bonded prestress FRP reinforced concrete beam, prestressing without bondn FRP reinforced concrete beam has deformability preferably fully, but its supporting capacity is starkly lower than bonded prestress FRP reinforced concrete beam, and depends on the operate as normal of end anchorage device.For this reason, the utility model proposes a kind of part binding prestress FRP reinforced concrete beam, result of study confirms: it has not only gathered the advantage of above-mentioned two kinds of adhesive form pre-stress FRP reinforced concrete beams, and on the basis that has than high bearing capacity, improve the distortion of structure greatly and improve ductile performance.

Summary of the invention

The purpose of this utility model provides a kind of part binding prestress compo (FRP) reinforced concrete beam, overcome the distortion of complete bonded prestress FRP reinforced concrete beam and prolong poor performance, prestressing without bondn FRP reinforced concrete Liangqi supporting capacity is low and depend on the shortcoming of end anchorage device fully.

Part binding prestress compo (FRP) reinforced concrete beam, it comprises concrete beam, pre-stress FRP muscle, non-prestressing tendon, stirrup, anchor device, bellows, grouting material, sleeve pipe, head plate.The layout of non-prestressing tendon and stirrup is identical with normal reinforced concrete beam in the beam, and pre-stress FRP muscle section and the no adhesive structure form of concrete employing in girder span; In beam end and concrete employing the adhesive structure form is arranged;

At no adhesive structure section, in pre-stress FRP muscle threading, each seals the sleeve pipe two ends with a head plate, places bellows then, and the pre-stress FRP muscle can be free to slide in sleeve pipe;

In that the bonding section is arranged, directly the pre-stress FRP muscle is placed bellows; Inject the grouting material in bellows, presstressed reinforcing steel and concrete beam are divided with inside at sleeve pipe form no adhesive structure, part is formed with adhesive structure beyond sleeve pipe.

Bellows described in the utility model can be a metal bellows, and sleeve pipe can be a plastic bushing, and head plate can be a plastic foam.

Simple in structure, the easy construction of the utility model, part adhesive structure between pre-stress FRP muscle and the concrete, can effectively improve the stress performance of complete bonded prestress FRP reinforced concrete beam and strengthen its structure ductility on the one hand, can overcome complete prestressing without bondn FRP reinforced concrete beam on the other hand and depend on the shortcoming of end anchorage device operate as normal, and can improve structure bearing capacity greatly.

Below in conjunction with the drawings and specific embodiments the utility model is described in detail.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is that the utility model does not have bond regions segment structure schematic diagram.

1. concrete beam, 2. pre-stress FRP muscle, 3. non-prestressing tendon, 4. stirrup, 5. anchor device, 6. bellows, 7. grouting material, 8. sleeve pipe, 9. head plate.

The specific embodiment

Part binding prestress compo (FRP) reinforced concrete beam, it comprises concrete beam 1, pre-stress FRP muscle 2, non-prestressing tendon 3, stirrup 4, anchor device 5, bellows 6, grouting material 7, sleeve pipe 8, head plate 9.Bellows 6 adopts metal bellows, and sleeve pipe 8 adopts plastic bushing, and head plate 9 adopts plastic foam; Non-prestressing tendon is identical with normal reinforced concrete beam with the stirrup structure in the beam, and pre-stress FRP muscle 2 section and the no adhesive structure of concrete employing in girder span; In beam end and concrete employing adhesive structure is arranged; The layout of pre-stress FRP muscle 2: the length that requires according to pre-stress FRP muscle in the structure is cut muscle; Many pre-stress FRP muscle bundles are rolled together, at nothing bonding section pre-stress FRP muscle 2 usefulness plastic bushings 8 are packaged, and use plastic foam 9 good seals at the sleeve pipe two ends; The pre-stress FRP muscle is put into metal bellows 6 together with plastic bushing 8; And then metal bellows 6 is arranged on the corresponding position of concrete beam template; Carry out simultaneously non-prestressing tendon 3 and stirrup 4 layout, tie up and roll; Disturbing concrete injects template, treats that concrete reaches desired compressive strength, adopts jack pair pre-stress FRP muscle 2 to carry out stretch-draw, after stretch-draw finishes, uses fixedly pre-stress FRP muscle 2 of anchor device 5; In bellows 6, inject grouting material 7, this moment, the pre-stress FRP muscle in plastic bushing 8 was rendered as no adhesive form in plastic bushing, pre-stress FRP muscle outside plastic bushing 8 has been rendered as adhesive form, has realized the part bonding between pre-stress FRP muscle and the concrete.

The concrete beam of the utility model structure can reach on the basis that guarantees supporting capacity, improves the distortion of structure greatly and improves ductile performance.Simple in structure, easy construction are not only applicable to many, high building structure, and more are applicable to multiple buildings such as bridge construction, hydraulic structure and sea port dock.

Claims

1. part binding prestress compo (FRP) reinforced concrete beam, it comprises concrete beam (1), pre-stress FRP muscle (2), non-prestressing tendon (3), stirrup (4), anchor device (5), bellows (6), grouting material (7), sleeve pipe (8), head plate (9), non-prestressing tendon (3) is identical with normal reinforced concrete beam with the layout of stirrup (4) in the beam, it is characterized in that: pre-stress FRP muscle (2) is section and the no adhesive structure of concrete employing in girder span; In beam end and concrete employing adhesive structure is arranged;

At no adhesive structure section, in pre-stress FRP muscle (2) threading (8), each seals the sleeve pipe two ends with a head plate (9), places bellows (6) then;

The bonding section is being arranged, directly pre-stress FRP muscle (2) is being placed bellows (6); Inject the grouting material in bellows (6), presstressed reinforcing steel and concrete beam are divided with inside at sleeve pipe form no adhesive structure, part is formed with adhesive structure beyond sleeve pipe.