CN113684968A - Assembled FRP section bar-concrete combination beam - Google Patents
Assembled FRP section bar-concrete combination beam Download PDFInfo
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- CN113684968A CN113684968A CN202111174838.9A CN202111174838A CN113684968A CN 113684968 A CN113684968 A CN 113684968A CN 202111174838 A CN202111174838 A CN 202111174838A CN 113684968 A CN113684968 A CN 113684968A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
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Abstract
The invention discloses an assembled FRP (fiber reinforced plastic) profile-concrete composite beam which comprises a precast concrete plate and an FRP profile, wherein the precast concrete plate is provided with preformed holes which are arranged at intervals along the length direction of the precast concrete, the upper surface of the FRP profile is provided with a shear connector, the precast concrete plate is arranged above the FRP profile, UHPC (ultra high performance concrete) is poured in the preformed holes, and the FRP profile is in shear connection with the UHPC. The assembled FRP profile-concrete composite beam has the advantages of saving templates, improving construction environment, improving construction efficiency and the like of an assembled structure, and simultaneously has the advantages of small self weight, high bearing capacity, good durability and the like of the FRP profile-concrete composite structure.
Description
Technical Field
The invention belongs to the technical field of composite beams, and particularly relates to an assembled FRP (fiber reinforced plastic) section-concrete composite beam.
Background
The Fiber Reinforced Polymer composite (FRP) has the obvious advantages of corrosion resistance, fatigue resistance, light weight, high strength, no magnetism and the like, can replace steel and the like to be used as a structural material, and is one of effective measures for solving the problem of steel corrosion in severe environment. At present, the application of FRP profiles in bridge engineering enters a new stage of a large number of constructions, and more than 200 engineering examples are available all over the world.
The Ultra-High-Performance Concrete (UHPC for short) is a heterogeneous composite material formed by doping disorderly and randomly distributed micro steel fibers into a UHPC matrix, and has ultrahigh compressive strength (more than 150 MPa), ultrahigh breaking strength, excellent toughness, excellent fatigue resistance and impact resistance, and excellent wear resistance and explosion resistance. The adoption of the ultra-high performance concrete to replace the common concrete can effectively solve the durability problem, can better adapt to the development trend of the current civil engineering structure, and can also meet the development requirement of social sustainable development on high-performance materials.
In the FRP profile-concrete combined structure, a combined interface is a weak and key part of the FRP profile-concrete combined structure, and the premise and the foundation for developing the FRP profile-concrete combined structure are to ensure the reliability and the durability of the combined interface. Due to the non-weldability of FRP materials, the interface connection has always prevented the development and wide application of FRP profile-concrete composite structures. Therefore, the interface connection between FRP profiles and concrete slabs is of critical importance. The FRP section-concrete combined interface connecting part often has stress concentration, and common concrete is easy to seriously deteriorate under the coupling action of high stress and environmental factors.
UHPC is a new high-performance cement-based composite material with excellent mechanical properties and durability, e.g., ultra-high compressive strength (above 150 MPa), ultra-high flexural strength, excellent toughness, superior fatigue resistance, impact resistance, and antiknock properties. Compared with common concrete, the material has obvious durability advantage, however, because the UHPC material has high cost which is about 10 times of the cost of the common concrete, the FRP profile-UHPC combined structure also faces the problem of difficult popularization in the practical engineering application.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides the assembled FRP profile-concrete composite beam which has the advantages of saving templates, improving the construction environment, improving the construction efficiency and the like, and has the advantages of small self weight, high bearing capacity, good durability and the like.
The FRP profile-concrete composite beam comprises a precast concrete plate and an FRP profile.
The precast concrete slab is provided with a preformed hole which is arranged along the length direction of the precast concrete;
the prefabricated concrete slab is arranged above the FRP sectional material and is abutted against the FRP sectional material, UHPC is poured in the reserved hole, the FRP sectional material is locally connected with the UHPC in a shearing manner through the shearing force connecting piece, and the shearing force connecting piece is partially arranged in the UHPC material and is fixedly connected with the UHPC.
In some embodiments, the FRP section has a flange, and the shear connector is provided at the flange.
In some embodiments, the shear connector is a steel bolt or FRP connector.
In some embodiments, the diameter of the bolt is 0.8-1.2 times of the thickness of the flange of the FRP section, and the length of the bolt embedded in the UHPC part is one third to two thirds of the thickness of the UHPC.
In some embodiments, the preformed holes may be circular holes, continuous holes, or intermittent holes.
In some embodiments, the diameter of the circular hole may be 0.4-0.6 times the width of the precast concrete plate.
In some embodiments, the width of the intermittently formed holes or the continuously formed holes has the same cross-sectional width along the length direction of the beam, which is 0.4 to 0.6 times the width of the precast concrete slab.
In some embodiments, the length of the discontinuity forming hole is 0.06 to 0.1 times the length of the precast concrete slab.
In some embodiments, there are structural ribs within the concrete, the structural ribs being evenly spaced along a transverse or longitudinal direction within the concrete slab.
In some embodiments, the longitudinal structural rib reinforcement ratio of the structural ribs is between 0.5% and 1.5%, the longitudinal spacing of the structural ribs is between 100 millimeters and 150 millimeters, and the transverse spacing is between 100 millimeters and 200 millimeters. Has the advantages that:
1. according to the assembled FRP profile-concrete composite beam, the advantages of saving templates, improving construction environment, improving construction efficiency and the like can be achieved, and the assembled FRP profile-concrete composite beam has the advantages of being small in self weight, high in bearing capacity, good in durability and the like.
2. The assembled FRP profile-concrete composite beam is formed by combining and connecting local UHPC and bolts, and has good stress performance and strong bearing capacity.
3. The strength and density of concrete around the stud are enhanced by adopting the UHPC in the reserved hole, the shear resistance and the connection performance of the bolt are improved, and the anti-sliding capability of a combined interface is further improved.
4. The UHPC material is only used at the key connection part, the prefabricated common concrete slab is used in other areas, the material cost is greatly reduced, meanwhile, the safety, the durability and the building industrialization degree of the composite beam are greatly improved by using the specially designed bolt shear connection piece, and on the basis of having the advantages of prefabricated assembly type, the UHPC partially replaces the common concrete to realize the improvement of the composite structure in the aspects of strength, rigidity, durability and the like.
5. Can solve the problems of insufficient durability of common concrete structure and difficult popularization of UHPC material in marine environment
And 6, the interface connecting part of the FRP profile and the concrete composite beam often has stress concentration, and common concrete is easy to seriously deteriorate under the coupling action of high stress and environmental factors. The invention can well solve the engineering problem of insufficient durability of common concrete at the interface of the FRP profile and the concrete composite beam.
Drawings
FIG. 1 is a schematic view of a fabricated FRP profile-concrete composite beam according to an embodiment of the invention;
FIG. 2 is a front view of a fabricated FRP profile-concrete composite beam according to an embodiment of the invention;
FIG. 3 is a side view of a fabricated FRP profile-concrete composite beam according to an embodiment of the present invention;
FIG. 4 is a partially enlarged view of a fabricated FRP profile-concrete composite beam according to another embodiment of the present invention;
FIG. 5 is a schematic view of a fabricated FRP profile-concrete composite beam according to another embodiment of the invention;
fig. 6 is a partial schematic view of a fabricated FRP profile-concrete composite beam according to another embodiment of the present invention.
Reference numerals:
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Example one
As shown in fig. 1 to 4, a fabricated FRP profile-concrete composite beam includes an FRP (fiber reinforced polymer composite) profile 1; a shear connector 2; a precast concrete slab 3; UHPC (ultra high performance concrete) material 4; the ribs 5 are constructed.
The FRP profile 1 may be one of an i-shaped profile, a box-shaped profile, a T-shaped profile, and a multi-cavity profile formed of a hybrid fiber composite material in which two or more fibers among a Glass Fiber Reinforced Plastic (GFRP) profile, a Carbon Fiber (CFRP) profile, a Basalt Fiber (BFRP) profile, and an Aramid Fiber (AFRP) profile are mixed.
The FRP profiles 1 have flanges. The shear connecting piece 2 is arranged at the flange of the FRP section bar 1, the shear connecting piece 2 can be a steel bolt or an FRP connecting piece, and the diameter of the shear connecting piece 2 is equal to the thickness of the flange of the FRP section bar 1.
In the embodiment, the precast concrete plate with the preformed hole and the industrially manufactured FRP sectional material are formed by local connection, so that a novel connection mode that the post-cast UHPC and the shear connector are used for shear force transmission is formed at a combined interface.
And a backing plate 6 for loading is arranged on the precast concrete plate 3, and cushion blocks 7 for supporting are arranged below two end parts of the FRP profile.
The main factors influencing the shear strength of the bolt in the composite beam comprise the compressive strength of concrete and various performances of the bolt, and the compressive strength of the UHPC material 4 is obviously higher than that of common concrete, so that the shear bearing capacity of the bolt at a composite interface can be effectively improved. Meanwhile, the UHPC material 4 has higher rigidity and is not easy to crack under larger load, and the interfacial slippage of the composite beam can be reduced. The UHPC material 4 can also increase the section moment of inertia of the composite beam, thereby reducing the mid-span deflection and deformation of the composite beam and improving the bending rigidity of the composite beam. In addition, as the load is increased, relative slip is generated between the concrete and the FRP section bar 1, the slip can cause additional strain to increase the curvature of the structure, and additional deflection is generated, and the UHPC material 4 inhibits the additional deflection of the composite beam. The UHPC material 4 has an ultra-high durability, which can increase the service life of the composite beam.
The construction method comprises the following steps:
as shown in fig. 4, the longitudinally and transversely distributed constructional bars 5 and the hole forming mould are placed in the erected concrete slab formwork, and the constructional bars 5 can be steel bars. And pouring concrete into the concrete template to form the precast concrete plate 3, vibrating to compact, and maintaining. The precast concrete slab 3 is provided with preformed holes which are evenly distributed along the length direction of the precast concrete slab 3 at intervals and are discontinuous rectangular holes.
And fixing the bolt at the corresponding position of the flange on the FRP section bar 1 by using a torque wrench, wherein the torque is 50 N.m. And then placing the precast concrete plate 3 on the FRP section bar 1, partially extending the bolt into the reserved hole to finish positioning, pouring UHPC into the reserved hole after the positioning is finished, and maintaining after the pouring is finished.
The UHPC comprises ultrahigh-performance concrete, ultrahigh-performance fiber concrete and the like, is a novel high-performance cement-based composite material with ultrahigh mechanical property and ultrahigh durability, and is provided with 1-3% of steel fibers by volume.
Wherein, the shear connector at the interface adopts the interface construction measures of pure bolts and the mixed connection of the bolts and glue.
The scheme can improve the durability and the anti-sliding capability of the combined interface and improve the rigidity of the beam.
Example two:
as shown in fig. 5 and 6, the fabricated FRP section-concrete composite beam according to another embodiment of the present invention is different from the first embodiment in that the prepared hole is a continuous rectangular hole, and is pre-tightened after the shear connector 2 is positioned on the flange of the FRP section 1.
Compared with the first embodiment, the bearing capacity of the combined beam can be greatly improved.
And a second construction mode:
as shown in fig. 5 and 6, the longitudinally distributed and transversely distributed constructional bars 5 and the hole forming mould are placed in the erected concrete slab formwork, and the constructional bars 5 can be steel bars. And pouring concrete into the concrete template to form the precast concrete plate 3, vibrating to compact, and maintaining. The precast concrete slab 3 has prepared holes evenly spaced along the length of the precast concrete slab 3. The prepared hole is a continuous rectangular hole.
And fixing the bolt at the corresponding position of the flange on the FRP section 1 by using a torque wrench, wherein the torque is 50 N.m, and then pre-tightening. And (3) placing the precast concrete plate 3 on the FRP section bar 1, partially extending the bolt into the reserved hole to finish positioning, pouring UHPC into the reserved hole after the positioning is finished, and maintaining after the pouring is finished.
The scheme can improve the durability and the anti-sliding capability of the combined interface, improve the rigidity of the combined beam and greatly improve the bearing capacity of the combined beam.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
In the description of the present invention, it is to be understood that the terms "left", "right", "front", "rear", "upper", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the scope of the present invention.
Claims (10)
1. An assembled FRP section-concrete composite beam, characterized by comprising:
the precast concrete slab is provided with a preformed hole which is arranged along the length direction of the precast concrete;
the prefabricated concrete slab is arranged above the FRP profile and abuts against the FRP profile, UHPC is poured in the reserved hole, the shear connector is partially arranged in the UHPC material and fixedly connected with the UHPC, and shear force transmission is carried out between the FRP profile and the UHPC through the shear connector.
2. The fabricated FRP section-concrete composite beam as claimed in claim 1, wherein the FRP section has a flange, and the shear connector is provided at the flange.
3. The fabricated FRP profile-concrete composite beam of claim 1, wherein the shear connector is a steel bolt or an FRP connector.
4. The fabricated FRP profile-concrete composite beam as claimed in any one of claims 2 or 3, wherein the diameter of the bolt is 0.8-1.2 times of the thickness of the flange of the FRP profile, and the length of the bolt embedded in the UHPC part is one third to two thirds of the thickness of the UHPC.
5. The fabricated FRP section-concrete composite beam as claimed in claim 1, wherein the prepared holes may be circular holes, continuous holes, or intermittent holes.
6. The fabricated FRP profile-concrete composite beam of any one of claim 5, wherein the diameter of the circular hole is 0.4-0.6 times the width of the precast concrete plate.
7. The fabricated FRP profile-concrete composite beam as claimed in any one of claim 5, wherein the continuously or intermittently formed holes have the same sectional width in the beam length direction, and the width thereof is 0.4 to 0.6 times the width of the precast concrete slab.
8. The fabricated FRP profile-concrete composite beam as claimed in any one of claim 7, wherein the length of the continuously or intermittently formed holes is 0.06-0.1 times the length of the precast concrete slab.
9. The fabricated FRP profile-concrete composite beam of claim 1, wherein the concrete is provided therein with construction ribs, the construction ribs being arranged at an average interval in a transverse or longitudinal direction within the concrete slab.
10. The fabricated FRP section-concrete composite beam as claimed in claim 9, wherein a longitudinal structural rib reinforcement ratio of the structural ribs is between 0.5% and 1.5%, a longitudinal interval of the structural ribs is between 100 mm and 150 mm, and a lateral interval of the structural ribs is between 100 mm and 200 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111174838.9A CN113684968A (en) | 2021-10-09 | 2021-10-09 | Assembled FRP section bar-concrete combination beam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111174838.9A CN113684968A (en) | 2021-10-09 | 2021-10-09 | Assembled FRP section bar-concrete combination beam |
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| CN113684968A true CN113684968A (en) | 2021-11-23 |
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| CN202111174838.9A Pending CN113684968A (en) | 2021-10-09 | 2021-10-09 | Assembled FRP section bar-concrete combination beam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116145531A (en) * | 2023-03-07 | 2023-05-23 | 暨南大学 | Assembled FRP-UHPC combined structure connected in clustered mode and construction method |
| GB2617894A (en) * | 2022-02-15 | 2023-10-25 | Sustainable Resources Ltd | A foundation beam |
-
2021
- 2021-10-09 CN CN202111174838.9A patent/CN113684968A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2617894A (en) * | 2022-02-15 | 2023-10-25 | Sustainable Resources Ltd | A foundation beam |
| CN116145531A (en) * | 2023-03-07 | 2023-05-23 | 暨南大学 | Assembled FRP-UHPC combined structure connected in clustered mode and construction method |
| CN116145531B (en) * | 2023-03-07 | 2024-03-22 | 暨南大学 | Assembled FRP-UHPC combined structure connected in clustered mode and construction method |
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