Corrugated steel web composite beam structure adopting steel-FRP mixed stiffening ribs

Abstract

The utility model relates to a corrugated steel web composite beam structure adopting steel-FRP (fiber reinforced plastic) mixed stiffening ribs, which is characterized by comprising concrete slabs, a steel beam and the steel-FRP mixed stiffening ribs, the steel-FRP mixed stiffening rib is formed by connecting a plurality of sections of corrugated stiffening ribs and steel-FRP connecting pieces located between every two adjacent corrugated stiffening ribs into a whole, and the steel-FRP mixed stiffening rib is linearly arranged in the longitudinal direction of the corrugated steel web of the steel beam. And in one wave band, the steel-FRP mixed stiffening ribs are only connected with the wave crests or the wave troughs of the corrugated steel webs. According to the corrugated steel web composite beam structure, the overall shear buckling bearing capacity of the corrugated steel web can be remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to civil engineering technical field especially is related to a kind of corrugated steel web composite beam structure using steel-FRP hybrid stiffener. BACKGROUND

[0002] Corrugated steel web is widely applied and developed at home and abroad due to its unique structural performance and economic advantage.Corrugated steel web composite beam replaces traditional flat steel plate as web by adopting corrugated steel plate, compared with traditional composite beam, it has the advantages of light weight, high prestress efficiency, good seismic performance, good stability and good durability.

[0003] In recent years, with the increase of bridge span using corrugated steel web, the overall shear buckling of corrugated steel web composite beam becomes the key factor of the control design of this kind of bridge type.Stiffener can effectively improve the overall buckling resistance of corrugated steel web, but stiffener will reduce the corrugation effect of corrugated steel web, increase the axial stiffness of corrugated steel web and reduce the effective prestress effect.Therefore, it is necessary to find a kind of stiffener structure that can improve the overall buckling resistance of corrugated steel web and reduce the influence of stiffener on the axial stiffness of corrugated steel web. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a kind of corrugated steel web composite beam structure using steel-FRP hybrid stiffener, which can significantly improve the overall shear buckling bearing capacity of corrugated steel web.

[0005] To achieve the above purpose, the utility model provides the following scheme:

[0006] The corrugated steel web composite beam structure using steel-FRP hybrid stiffener of the utility model has the characteristics that it comprises concrete slab, steel beam and steel-FRP hybrid stiffener, the concrete slab is located at the top and bottom of the steel beam, the steel-FRP hybrid stiffener is connected into a whole by multiple wave-shaped stiffeners and steel-FRP connecting pieces located between two adjacent wave-shaped stiffeners, the steel-FRP hybrid stiffener is arranged in a straight line along the longitudinal direction of the corrugated steel web of the steel beam, and the steel-FRP hybrid stiffener is connected only with the wave crest or wave trough of the corrugated steel web within one wave segment.

[0007] Preferably, the above-mentioned steel beam is composed of upper flat steel plate, lower flat steel plate and corrugated steel web perpendicular to the upper flat steel plate and lower flat steel plate arranged in parallel and at intervals, the upper surface of the upper flat steel plate is provided with the concrete slab, and the lower surface of the lower flat steel plate is also provided with the concrete slab, and the concrete slab and the upper flat steel plate or the lower flat steel plate are connected together by stud.

[0008] Preferably, the corrugated stiffening rib is a square tube formed by welding two parallel and spaced corrugated steel stiffening rib plates and two parallel and spaced flat steel stiffening rib plates perpendicularly, wherein the corrugated steel stiffening rib plates are arranged perpendicularly to the corrugated steel web.

[0009] Preferably, the end of each corrugated stiffening rib is provided with an opening flange plate on the outer end face, and the flat steel plate on the steel-FRP connecting piece is connected to the opening flange plate through the bolt.

[0010] Preferably, the steel-FRP connecting piece is composed of a flat steel plate attached to the outer end face of the corrugated stiffening rib and two FRP plates attached to the surface of the corrugated steel stiffening rib plate, the flat steel plate is connected to one side of the angle steel, and the other side of the angle steel is connected to the FRP plate.

[0011] Preferably, the flat steel plate is provided with a flat steel plate reserved hole, and the opening flange plate is provided with an opening flange plate reserved hole, and the bolt or bolt is arranged on the flat steel plate reserved hole and the opening flange plate reserved hole to realize the connection of the adjacent two corrugated stiffening ribs.

[0012] Preferably, at least two wave crests of each corrugated stiffening rib are coated with epoxy resin adhesive between the contact surface of the FRP plate of the steel-FRP connecting piece.

[0013] Preferably, the contact surface between the FRP plate of the steel-FRP connecting piece and the angle steel is coated with epoxy resin adhesive; the fiber direction of the FRP plate is perpendicular to the length direction of the corrugated stiffening rib, and the FRP plate is produced by pultrusion process.

[0014] Preferably, the inner end of the FRP plate is spaced from the flat steel plate to avoid the opening flange plate.

[0015] Preferably, the steel-FRP hybrid stiffening rib is fixedly connected to the wave crest or wave trough of the corrugated steel web by welding.

[0016] The utility model discloses the following technical effects are obtained relative to the prior art:

[0017] 1. Compared with the traditional corrugated steel web composite beam without stiffening rib, the corrugated steel web composite beam structure with steel-FRP hybrid stiffening rib can enhance the integrity of the corrugated steel web, reduce the effective height of the web, and significantly improve the overall shear buckling bearing capacity of the composite beam.

[0018] 2. Compared with the stiffening rib composed of flat steel plates, the corrugated steel web composite beam structure with steel-FRP hybrid stiffening rib makes the stiffening rib into a corrugated structure, effectively controls the overall buckling on both sides of the stiffening rib under the condition that the stiffening rib has sufficient bending stiffness, does not significantly increase the axial stiffness of the web, and effectively reduces the influence of the stiffening rib on the prestress effect.

[0019] 3. Compared with the corrugated steel web structure with slidable stiffening ribs, the corrugated steel web composite beam structure with steel-FRP hybrid stiffening ribs is spliced by connectors between the stiffening ribs, which is beneficial to the assembly production, and the precision release can be carried out at the connection, the construction precision requirement is small, and the construction difficulty is further reduced.

[0020] 4. The FRP plate in the steel-FRP connector is produced by pultrusion process and the fiber direction is perpendicular to the length direction of the stiffening rib, which can reduce the axial stiffness of the connector in the length direction of the stiffening rib through the anisotropic characteristics of the FRP plate. In addition, compared with the large-size FRP plate, the FRP size at the connector is small, which is convenient for large-scale production by pultrusion process.

[0021] In summary, the corrugated steel web composite beam structure with steel-FRP hybrid stiffening ribs has high overall shear buckling bearing capacity and low axial stiffness, can effectively reduce the influence of the stiffening rib on the prestress effect, fully utilizes the material properties and production process of the small-size FRP plate, and the adopted stiffening rib form is easy to install, and the construction difficulty is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 is a three-dimensional structure schematic diagram of the corrugated steel web composite beam structure with steel-FRP hybrid stiffening ribs.

[0024] Figure 2 is a three-dimensional structure schematic diagram of the corrugated steel web composite beam structure with steel-FRP hybrid stiffening ribs.

[0025] Figure 3 is a three-dimensional structure schematic diagram of the corrugated steel web composite beam structure with steel-FRP hybrid stiffening ribs.

[0026] Figure 4 is an explosion structure schematic diagram of the bolted nail, the flat steel plate and the perforated flange plate.

[0027] Figure 5 is a connection structure schematic diagram of the corrugated steel web composite beam structure with steel-FRP hybrid stiffening ribs.

[0028] 1, concrete slab, 2, corrugated stiffening rib, 3, steel-FRP connecting piece, 4, upper flat steel plate, 41, lower flat steel plate, 5, corrugated steel web, 6, steel beam, 7, flat steel stiffening rib plate, 8, corrugated steel stiffening rib plate, 9, opening flange plate reserved hole, 10, opening flange plate, 11, flat steel plate reserved hole, 12, angle steel, 13, FRP plate, 14, flat steel plate, 15, nut, 16, bolt, 17, steel-FRP hybrid stiffening rib. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0030] The utility model provides a kind of corrugated steel web composite beam structure using steel-FRP hybrid stiffening rib, solve the problems existing in prior art, the structure form uses multiple corrugated stiffening rib and steel-FRP connecting piece to stiffen corrugated steel web, with higher overall shear buckling bearing capacity and lower axial stiffness, it can effectively reduce the influence of stiffening rib on prestressed effect, make full use of the material properties and production process of small size FRP plate, and the stiffening rib form used is easy to install, reduce construction difficulty.

[0031] To make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0032] As Figures 1-5 The utility model adopts the corrugated steel web composite beam structure using steel-FRP hybrid stiffening rib, including concrete slab 1, steel beam 6 and steel-FRP hybrid stiffening rib 17;Wherein steel beam 6 is composed of upper flat steel plate 4, lower flat steel plate 41 and vertical corrugated steel web 5 between upper flat steel plate and lower flat steel plate arranged in parallel and interval, the upper surface of upper flat steel plate is equipped with the concrete slab 1, and the lower surface of lower flat steel plate is also equipped with the concrete slab 1, the concrete slab 1 is connected together with upper flat steel plate 4 or lower flat steel plate 41 by bolt or bolt (the connection of the two is prior art, not repeated here).

[0033] The steel-FRP hybrid stiffening rib is connected to one side or both sides of the corrugated steel web 5 of the steel beam 6 by a plurality of wave-shaped stiffening ribs 2 and steel-FRP connectors 3 located between two adjacent wave-shaped stiffening ribs 2, and is arranged linearly along the longitudinal direction of the beam (i.e. parallel to the upper and lower flat steel plates 4, 41), and the steel-FRP hybrid stiffening rib is connected to the wave crest or wave trough of the corrugated steel web 5 within a wave segment (i.e. within a certain length range, such as 1-5 meters, etc.).

[0034] The wave-shaped stiffening rib 2 is a square tube formed by welding two parallel and spaced wave-shaped steel stiffening rib plates 8 and two parallel and spaced flat steel stiffening rib plates 7 perpendicular to each other, wherein the two wave-shaped steel stiffening rib plates 8 are perpendicular to the corrugated steel web 5, and one of the flat steel stiffening rib plates 7 is welded to the wave crest of the corrugated steel web 5, and the other flat steel stiffening rib plate 7 is parallel and spaced from the corrugated steel web 5. The length of a wave-shaped stiffening rib 2 can be 1-5 meters, and adjacent wave-shaped stiffening ribs 2 are connected by steel-FRP connectors 3.

[0035] The steel-FRP connector 3 is composed of a flat steel plate 14 attached to the outer end surface of the wave-shaped stiffening rib 2 and two FRP plates 13 attached to the surface of the wave-shaped steel stiffening rib plate 8, the two FRP plates 13 are perpendicular to the flat steel plate 14, the flat steel plate 14 is connected to one side of the angle steel 12, the other side of the angle steel 12 is bonded to the FRP plate 13 by epoxy resin adhesive, and the inner end of the FRP plate 13 has a spacing from the flat steel plate 14 to avoid the opening flange plate 10; the fiber direction of the FRP plate is perpendicular to the length direction of the wave-shaped stiffening rib, and the FRP plate is produced by pultrusion process.

[0036] The end of each wave-shaped stiffening rib 2 is provided with an opening flange plate 10 on the outer end surface, the opening flange plate 10 is flush with the outer flat steel stiffening rib plate 7, the opening flange plate 10 is provided with an opening flange plate reserved hole 9, the flat steel plate 14 is provided with a flat steel plate reserved hole 11, the flat steel plate 14 of the steel-FRP connector 3 is connected by nails or bolts through the opening flange plate reserved hole 9 on the opening flange plate 10, that is, nails or bolts are passed through the flat steel plate reserved hole 11 and the opening flange plate reserved hole 9 to connect them, thereby realizing the connection of the two adjacent wave-shaped stiffening ribs 2.

[0037] At least two wave crests of each wave-shaped stiffening rib 2 are coated with epoxy resin adhesive between the contact surfaces of the FRP plate 13 of the steel-FRP connector 3 and the angle steel 12.

[0038] The installation steps of the steel-FRP hybrid stiffening rib 17 and the corrugated steel web 5,

[0039] The corrugated stiffening rib 2 is a prefabricated pipe material, the corrugated stiffening rib 2 is welded and fixed with the corrugated steel web 5 through a flat steel stiffening rib plate 7 on the corrugated stiffening rib 2, and the spacing of adjacent corrugated stiffening ribs 2 is ensured; the two angle steels 12 on the steel-FRP connecting piece 3 are welded and fixed with the flat steel plate 14 in advance, the opening flange plate 10 on the corrugated stiffening rib 2 is connected with the flat steel plate 14 through the bolt 16 (which can be a bolt) penetrating the reserved hole 11 of the flat steel plate and the reserved hole 9 of the opening flange plate and the nut 15 to realize the fixation, then the epoxy resin adhesive is coated on the peak surface of the corrugated steel stiffening rib plate 8, the surface of the FRP plate 13 and one side surface of the angle steel 12 to realize the fixation of the FRP plate 13 with the corrugated steel stiffening rib plate 8, the angle steel 12 and the flat steel plate 14, that is, the fixation of the adjacent two corrugated stiffening ribs 2 through the steel-FRP connecting piece 3.

[0040] Since the corrugated stiffening rib 2 is welded into a whole through the steel-FRP connecting piece 3, the integrity of the corrugated steel web is enhanced, the effective height of the web is reduced, and the overall shear buckling bearing capacity of the composite beam is significantly improved.

[0041] The utility model discloses the following technical effects are obtained relative to the prior art:

[0042] 1. Compared with the conventional corrugated steel web composite beam without stiffening rib, the corrugated steel web composite beam structure adopting the steel-FRP mixed stiffening rib can enhance the integrity of the corrugated steel web, reduce the effective height of the web and significantly improve the overall shear buckling bearing capacity of the composite beam.

[0043] 2. Compared with the stiffening rib composed of the flat steel plate, the corrugated steel web composite beam structure adopting the steel-FRP mixed stiffening rib makes the stiffening rib into a corrugated structure, effectively controls the overall buckling on the two sides of the stiffening rib under the condition that the stiffening rib has sufficient bending stiffness, does not significantly increase the axial stiffness of the web and effectively reduces the influence of the stiffening rib on the prestress effect.

[0044] 3. Compared with the corrugated steel web structure adopting the slidable stiffening rib, the stiffening ribs of the corrugated steel web composite beam structure adopting the steel-FRP mixed stiffening rib are spliced through the connecting piece, which is beneficial to the assembly type production and can release the precision at the connecting position, so that the construction precision requirement is small and the construction difficulty is further reduced.

[0045] In summary, the corrugated steel web composite beam structure adopting the steel-FRP mixed stiffening rib has high overall shear buckling bearing capacity and low axial stiffness, can effectively reduce the influence of the stiffening rib on the prestress effect, fully utilizes the material properties and production process of the small-size FRP plate and the stiffening rib form adopted is easy to install, so that the construction difficulty is reduced.

[0046] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application.

Claims

1. A corrugated steel web composite beam structure employing steel-FRP hybrid stiffening ribs, characterized by: The application relates to a steel-FRP hybrid stiffening rib (17) and a concrete slab (1) and a steel beam (6), wherein the concrete slab (1) is arranged on the top and bottom of the steel beam (6), the steel-FRP hybrid stiffening rib (17) is formed by connecting multiple wave-shaped stiffening ribs (2) and steel-FRP connecting pieces (3) between two adjacent wave-shaped stiffening ribs (2) into an integrated body, the steel-FRP hybrid stiffening rib (17) is arranged linearly along the longitudinal direction of a wave-shaped steel web (5) of the steel beam (6), and the steel-FRP hybrid stiffening rib (17) is connected with only the wave crest or wave trough of the wave-shaped steel web (5) in one wave section.

2. The corrugated steel web composite beam structure with steel-FRP hybrid stiffening ribs as claimed in claim 1, wherein: The steel beam (6) is composed of upper and lower parallel and spaced steel plates (4) and (41) and a wave-shaped steel web (5) which is perpendicular to the upper and lower parallel and spaced steel plates (4) and (41), the upper surface of the upper parallel and spaced steel plate (4) is provided with the concrete slab (1), and the lower surface of the lower parallel and spaced steel plate (41) is also provided with the concrete slab (1), and the concrete slab (1) is connected with the upper and lower parallel and spaced steel plates (4) and (41) through bolts.

3. The corrugated steel web composite beam structure with steel-FRP hybrid stiffening ribs as claimed in claim 1, wherein: The wave-shaped stiffening rib (2) is a square tube which is formed by welding two wave-shaped steel stiffening rib plates (8) and two parallel and spaced steel stiffening rib plates (7) which are perpendicular to each other, wherein the wave-shaped steel stiffening rib plate (8) is arranged perpendicularly to the wave-shaped steel web (5).

4. The corrugated steel web composite beam structure with steel-FRP hybrid stiffening ribs as claimed in claim 3, characterized in that: The end of each wave-shaped stiffening rib (2) is provided with an opening flange plate (10) on the outer end surface, and a parallel and spaced steel plate (14) of the steel-FRP connecting piece (3) is connected into an integrated body through a bolt passing through an opening flange plate reserved hole (9) of the opening flange plate (10).

5. The corrugated steel web composite beam structure with steel-FRP hybrid stiffening ribs as claimed in claim 4, wherein: The steel-FRP connecting piece (3) is composed of a parallel and spaced steel plate (14) which is attached to the outer end surface of the wave-shaped stiffening rib (2) and two FRP plates (13) which are attached to the surface of the wave-shaped steel stiffening rib plate (8), the parallel and spaced steel plate (14) is connected with one side of an angle steel (12), and the other side of the angle steel (12) is connected with the FRP plate (13).

6. The corrugated steel web composite beam structure with steel-FRP hybrid stiffening ribs as claimed in claim 5, wherein: The parallel and spaced steel plate (14) is provided with a parallel and spaced steel plate reserved hole (11), and the opening flange plate (10) is provided with an opening flange plate reserved hole (9), and the parallel and spaced steel plate reserved hole (11) and the opening flange plate reserved hole (9) are provided with bolts or screws for connection, so as to realize the connection of two adjacent wave-shaped stiffening ribs (2).

7. The corrugated steel web composite beam structure with steel-FRP hybrid stiffening ribs as claimed in claim 6, wherein: Epoxy resin adhesive is applied between the contact surface of the FRP plate (13) of the steel-FRP connecting piece (3) and the contact surface of the angle steel (12).

8. The corrugated steel web composite beam structure with steel-FRP hybrid stiffening ribs as claimed in claim 7, wherein: The inner end of the FRP plate (13) is spaced from the parallel and spaced steel plate (14) to avoid the opening flange plate (10).

9. The corrugated steel web composite beam structure employing steel-FRP hybrid stiffening ribs as claimed in claim 7, wherein: The steel-FRP hybrid stiffening rib (17) is fixedly connected with the wave crest or wave trough of the wave-shaped steel web (5) through welding.

10. The corrugated steel web composite beam structure employing steel-FRP hybrid stiffening ribs as claimed in claim 1, wherein: ​

Images