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Fiber reinforced plastic-concrete composite beam

A technology of fiber-reinforced plastics and reinforced plastics, applied in bridges, joists, girders, etc., can solve the problems of large initial investment, low stiffness, and low strength utilization rate, and achieve the effects of anti-fatigue, low price, and light weight

Inactive Publication Date: 2011-03-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the pure FRP structure has many of the above advantages, it also has disadvantages such as large initial investment, low stiffness and low strength utilization rate, and it is urgent to develop new structural forms to solve these problems

Method used

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  • Fiber reinforced plastic-concrete composite beam
  • Fiber reinforced plastic-concrete composite beam
  • Fiber reinforced plastic-concrete composite beam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 2 and Figure 6 Shown, the composite beam that the present invention provides is the FRP-concrete composite beam that adopts box-shaped FRP beam and shear connector to be fine stones, mainly by box-shaped FRP beam 1, shear connector (fine stone) 2 and FRP reinforced concrete Plate 3 composition. (1) Box-shaped FRP beam 1 is composed of upper flange 4, lower flange 5 and double-row web 6, the upper end of web 6 is connected to upper flange 4, the lower end is connected to lower flange 5, web 6 and upper flange 4 is perpendicular to the lower flange 5; continuous fiber felt or cloth and continuous fiber bundles are formed by pultrusion process, and the fiber used is one of glass fiber, carbon fiber, basalt fiber, aramid fiber or a mixture of these four fibers. (2) The shear connector (fine stone) 2 adopts the bonded fine stone method: first, use coarse sandpaper or a grinder to polish the upper surface of the FRP beam upper flange 4; secondly, use aceton...

Embodiment 2

[0027] Such as figure 2 and Figure 6 Shown, this composite beam of the present invention is the FRP-concrete composite beam that adopts box-shaped FRP beam and shear connector as adhesive, mainly consists of box-shaped FRP beam 1, shear connector (adhesive) 2 and FRP reinforced concrete slab 3 composition.

[0028] Wherein the specific manufacturing method of the box-shaped FRP beam 1 and the FRP-reinforced concrete slab 3 is the same as that of Embodiment 1. The shear connector (adhesive) 2 uses the adhesive to directly bond the concrete: first, use coarse sandpaper or a grinder to polish the upper surface of the FRP beam upper flange 4; second, use acetone to scrub the polished surface; finally, use acetone to scrub the polished surface Evenly brush a layer of 2-3mm thick epoxy adhesive suitable for curing in a humid environment. The concrete needs to be poured before the epoxy adhesive is cured, and then cured together.

Embodiment 3

[0030] Such as image 3 and Figure 7 Shown, this composite beam of the present invention is the FRP-concrete composite beam that adopts box-shaped FRP beam and shear connector to be FRP shear nail, mainly by box-shaped FRP beam 1, shear connector (FRP shear nail) 2 It is composed of 3 FRP reinforced concrete slabs.

[0031] Wherein the specific manufacturing method of the box-shaped FRP beam 1 and the FRP-reinforced concrete slab 3 is the same as that of Embodiment 1. The shear connector (FRP shear stud) 2 adopts the method of embedding FRP shear studs, and the FRP shear studs use deformed FRP tendons: firstly, use a drilling machine to open a round hole on the upper flange 4 of the FRP beam, and the diameter of the round hole is slightly smaller than The diameter of the FRP shear nail (interference fit), the vertical and horizontal distance between the round holes, the distance between the round holes at the longitudinal ends and the longitudinal ends, and the distance bet...

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Abstract

The invention relates to a fiber reinforced plastic (FRP)-concrete composite beam, which belongs to the technical field of bridge engineering. The composite beam comprises a box-shaped FRP beam or an I-shaped FRP beam, a shear connector and an FRP rib concrete slab, wherein the box-shaped FRP or the I-shaped FRP beam consists of a top flange, a lower flange and a web plate; the shear connector consists of fine stones, an adhesive or FRP shear nails and is arranged on the top flange of the FRP beam; and the FRP rib concrete slab consists of concrete, longitudinal FRP ribs and horizontal FRP ribs and is positioned above the top flange of the FRP beam. By optimally combining the tensile property of an FRP material with the compressive property of a concrete material and taking simple and reliable shear connection measures, a steel-free composite beam is realized; and the composite beam has the advantages of corrosion resistance, high rigidity, fatigue resistance, low cost and the like, is easy and convenient to construct, and is a novel choice for modern bridge construction.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a fiber-reinforced plastic-concrete composite beam with excellent mechanical properties and high durability. Background technique [0002] Steel and concrete are the main construction materials in infrastructure at present, but for a long time, the corrosion and deterioration of steel structures and reinforced concrete structures have been very serious, which not only affects the normal use and life of the structures, but also causes a large number of safety accidents and hidden dangers . In recent years, Fiber Reinforced Plastic (FRP) has been used more and more in civil engineering due to its advantages of corrosion resistance, fatigue resistance, high specific strength and large specific modulus, and has gradually become a solution to infrastructure. One of the important ways to the growing steel corrosion problem. [0003] Although the pure FRP struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D19/00E04C3/29E04C5/07
Inventor 王言磊欧进萍
Owner DALIAN UNIV OF TECH
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