CN111910775A - FRP-concrete combination beam shear connector - Google Patents

Abstract

The invention discloses a shear connector for an FRP (fiber reinforced plastic) -concrete composite beam, which comprises an FRP perforated plate, an FRP I-shaped beam, perforated steel bars and concrete. Concrete is poured above the FRP I-beam, the upper surface of the FRP I-beam is connected with the bottom plate of the FRP perforated plate by adopting a plurality of bolts and epoxy resin glue, a plurality of perforated reinforcing steel bars are inserted into the connecting plate of the FRP perforated plate in a penetrating way, and the upper ends of the FRP perforated plate, the perforated reinforcing steel bars and the plurality of bolts are all positioned in the concrete. The FRP perforated plate and the FRP girder are in mixed connection through the rubber plugs, the bolts extend into concrete, and the bolts are connected with the perforated plate and the girder and bear interface shearing force, so that the shearing bearing capacity and the lifting resistance can be enhanced, and the construction is simple and the quality is reliable.

Description

A FRP-concrete composite beam shear connector

technical field

The invention relates to the technical field of FRP connectors, in particular to an FRP-concrete composite beam shear connector.

Background technique

For a long time, the corrosion of steel in civil engineering has seriously affected the service performance of the structure and reduced the durability of the structure. Fiber-reinforced composite materials (FRP) have become one of the most effective ways to solve the problem of steel durability due to their excellent corrosion resistance. 1. FRP is a new type of high-performance material formed by mixing fiber material and matrix material in a certain proportion and through a certain process. FRP-concrete composite beam is a new structural form, and its design concept is the same as steel-concrete composite beam and slab. : The upper part is the concrete which is mainly under compression, and the lower part is the FRP member which is mainly under tension. The shear connection between them makes the two work together, so that the FRP can be fully utilized. It has the advantages of light weight, high bearing capacity and good corrosion resistance. The advantages of the two materials can be played together, so the connection between the concrete beam and the FRP profile in the FRP-concrete composite beam is the key factor affecting its bearing capacity. Due to the unweldability of the FRP material, the connection between the FRP profile and the concrete Shear connections mainly include connection through natural friction, cementation, expansion agent connection, mechanical clinch connection, bolt connection and FRP perforated plate connection. The anti-slip effect and bearing capacity are also different due to the difference, so a structural form with good anti-slip effect and excellent shear bearing capacity is required.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a FRP-concrete composite beam shear connector with good anti-slip effect and excellent shear bearing capacity.

The technical solution adopted to achieve the purpose of the present invention is as follows, an FRP-concrete composite beam shear connector includes FRP perforated plate, FRP I-beam, perforated steel bar and concrete.

The cross section of the FRP perforated plate is in an inverted T shape, and the FRP perforated plate includes a bottom plate and a connecting plate. The bottom plate is a horizontally arranged rectangular plate, the upper surface of the bottom plate is vertically connected with a connecting plate, and the lower surface is connected with a FRP I-beam, and the length direction of the FRP I-beam is consistent with the length direction of the bottom plate.

The connecting plate is a rectangular plate whose length direction is consistent with the length direction of the bottom plate. The connecting plate is provided with a number of reserved holes for the perforated steel bars to pass through, and the reserved holes are arranged at equal intervals along the length direction of the connecting plate. Several of the perforated steel bars pass through the reserved holes.

The top of the FRP I-beam is poured with concrete, and the FRP perforated plate and the perforated steel bars are all located in the concrete.

Further, a plurality of bolt holes I are provided on the bottom plate, and the plurality of bolt holes I are respectively located on both sides of the connecting plate.

The FRP I-beam includes an upper flange, a web and a lower flange. The upper flange of the FRP I-beam is provided with several bolt holes II, which are respectively located on both sides of the web.

Several bolts pass through the bolt hole II and the bolt hole I from the lower end, each bolt is screwed into a nut, and the upper end of the bolt protrudes into the concrete.

Further, epoxy resin glue is applied on the connecting surface of the bottom plate and the FRP I-beam.

Further, the width of the bottom plate is smaller than the width of the FRP I-beam.

Further, the connecting plate and the web of the FRP I-beam are on the same vertical plane.

Further, the bolts are high-strength bolts.

The technical effect of the present invention is unquestionable. The FRP perforated plate of the FRP-concrete composite beam shear connector is connected with the FRP main beam through glue bolts. The bolts are extended into the concrete, and the bolts connect the perforated plate and the main beam. At the same time, it bears the interface shear force, which can enhance the shear bearing capacity and the anti-lifting force, and the construction is simple and reliable.

Description of drawings

Fig. 1 is the structural representation of FRP-concrete composite beam shear connector of the present invention;

Figure 2 is a top view of the FRP perforated plate;

Figure 3 is a side view of the FRP perforated plate;

Figure 4 is a top view of the FRP I-beam.

In the figure: FRP perforated plate 1, bottom plate 101, bolt hole I 1011, connecting plate 102, reserved hole 1021, FRP I-beam 2, bolt hole II 201, perforated steel bar 3, concrete 4 and bolt 5.

Detailed ways

The present invention will be further described below in conjunction with the examples, but it should not be understood that the scope of the above-mentioned subject matter of the present invention is limited to the following examples. Without departing from the above-mentioned technical idea of the present invention, various substitutions and changes can be made according to common technical knowledge and conventional means in the field, which shall be included in the protection scope of the present invention.

Example 1:

This embodiment discloses an FRP-concrete composite beam shear connector, which includes a FRP perforated plate 1 , an FRP I-beam 2 , a perforated steel bar 3 and concrete 4 .

The cross section of the FRP perforated plate 1 is an inverted T shape, and the FRP perforated plate 1 includes a bottom plate 101 and a connecting plate 102 . The bottom plate 101 is a horizontally arranged rectangular plate, the upper surface of the bottom plate 101 is vertically connected with a connecting plate 102, and the lower surface is connected with a FRP I-beam 2, and the length direction of the FRP I-beam 2 is consistent with the length direction of the bottom plate 101. The width of 101 is smaller than the width of the FRP I-beam 2 .

The bottom plate 101 and the FRP I-beam 2 are connected by several bolts 5 and epoxy resin glue. Referring to FIG. 2 , the bottom plate 101 is provided with several bolt holes I 1011 , and the several bolt holes I 1011 are respectively located on both sides of the connecting plate 102 and are symmetrical with respect to the connecting plate 102 . Referring to FIG. 4 , the FRP I-beam 2 includes an upper flange, a web and a lower flange. The upper flange of the FRP I-beam 2 is provided with several bolt holes II 201, and several bolt holes II 201 are located on both sides of the web respectively. and is symmetrical about the web. Several bolts 5 pass through the bolt hole II201 and the bolt hole I1011 from the lower end, each bolt 5 is screwed into a nut, and the bolt 5 is a high-strength bolt. The connecting plate 102 and the web of the FRP I-beam 2 are on the same vertical plane.

Referring to FIG. 3 , the connecting plate 102 is a rectangular plate whose length direction is consistent with the length direction of the bottom plate 101 . The connecting plate 102 is provided with a number of reserved holes 1021 for the perforated steel bars 3 to pass through. are arranged at equal intervals in the length direction, and the interval is 100mm. Several of the perforated steel bars 3 pass through the reserved holes 1021, and the perforated steel bars 3 are FRP bars or steel bars. The diameter of the reserved hole 1021 is larger than the sum of the diameter of the perforated steel bar 3 and the maximum particle size of the concrete 4 , so that the concrete 4 can completely fill the gap of the reserved hole 1021 .

Referring to FIG. 1 , concrete 4 is poured above the FRP I-beam 2 , and the upper ends of the FRP perforated plate 1 , the perforated steel bars 3 and the bolts 5 are all located in the concrete 4 . The concrete 4 may be ordinary concrete or ultra-high performance concrete (UHPC), and a steel cage is arranged in the concrete 4 .

During construction, the following steps are included:

S1. Several bolt holes I 1011 and several reserved holes 1021 are arranged on the FRP perforated plate 1, and several bolt holes II 201 are arranged on the FRP I-beam 2;

S2. Apply epoxy resin glue on the lower surface of the bottom plate 101 and the upper surface of the upper flange of the FRP I-beam 2, and connect the two with several bolts 5;

S3. Several of the perforated steel bars 3 pass through the reserved holes 1021;

S4. the template of concrete 4 is supported on the top of described FRP I-beam 2, common stirrups are laid in the template, common stirrups are disconnected at reserved holes 1021, then lay longitudinal common steel bars and bind with common stirrups Well, form a steel cage;

S5. Several of the perforated steel bars 3 are bound on the steel cage;

S6. Pour the concrete 4, and remove the formwork after curing.

The FRP-concrete composite beam shear connector in this embodiment extends the bolts 5 into the concrete 4, and the FRP perforated plate 1 and the FRP I-beam 2 bear the interface shear force at the same time, which can enhance the shear bearing capacity and the anti-lifting resistance. strength, and simple construction and reliable quality.

Example 2:

This embodiment discloses an FRP-concrete composite beam shear connector, which includes a FRP perforated plate 1 , an FRP I-beam 2 , a perforated steel bar 3 and concrete 4 .

The cross section of the FRP perforated plate 1 is an inverted T shape, and the FRP perforated plate 1 includes a bottom plate 101 and a connecting plate 102. The bottom plate 101 is a horizontally arranged rectangular plate. The upper surface of the bottom plate 101 is vertically connected with a connecting plate 102 , and the lower surface is connected with an FRP I-beam 2 .

Referring to FIG. 3 , the connecting plate 102 is a rectangular plate whose length direction is consistent with the length direction of the bottom plate 101 . The connecting plate 102 is provided with a number of reserved holes 1021 for the perforated steel bars 3 to pass through. are arranged at equal intervals in the length direction. Several of the perforated steel bars 3 pass through the reserved holes 1021 .

Referring to FIG. 1 , concrete 4 is poured above the FRP I-beam 2 , and the FRP perforated plate 1 and the perforated steel bars 3 are located in the concrete 4 .

Example 3:

The main structure of this embodiment is the same as that of Embodiment 2. Further, referring to FIG. 2 , the bottom plate 101 is provided with several bolt holes I1011 , and several bolt holes I1011 are located on both sides of the connecting plate 102 respectively.

The FRP I-beam 2 includes an upper flange, a web and a lower flange. Referring to Figure 4, the upper flange of the FRP I-beam 2 is provided with several bolt holes II 201, and several bolt holes II 201 are located on both sides of the web respectively. .

Several bolts 5 pass through the bolt hole II201 and the bolt hole I1011 from the lower end, each bolt 5 is screwed into a nut, see FIG.

Example 4:

The main structure of this embodiment is the same as that of Embodiment 3, and further, epoxy resin glue is applied on the connecting surface of the bottom plate 101 and the FRP I-beam 2 .

Example 5:

The main structure of this embodiment is the same as that of Embodiment 4. Further, referring to FIG. 1 , the width of the bottom plate 101 is smaller than the width of the FRP I-beam 2 .

Example 6:

The main structure of this embodiment is the same as that of Embodiment 5. Further, referring to Fig. 1 , the connecting plate 102 and the web of the FRP I-beam 2 are on the same vertical plane.

Example 7:

The main structure of this embodiment is the same as that of Embodiment 6, and further, the bolts 5 are high-strength bolts.

Claims (6)

1. a FRP-concrete composite beam shear connector, is characterized in that: comprise described FRP perforated plate (1), FRP I-beam (2), perforated steel bar (3) and concrete (4); The cross section of the FRP perforated plate (1) is in an inverted T shape, and the FRP perforated plate (1) includes a bottom plate (101) and a connecting plate (102); the bottom plate (101) is a horizontally arranged rectangular plate, and the bottom plate ( The upper surface of 101) is vertically connected with a connecting plate (102), and the lower surface is connected with a FRP I-beam (2), and the length direction of the FRP I-beam (2) is consistent with the length direction of the bottom plate (101); The connecting plate (102) is a rectangular plate whose length direction is consistent with the length direction of the bottom plate (101). The holes (1021) are arranged at equal intervals along the length direction of the connecting plate (102); a plurality of the perforated reinforcing bars (3) pass through the reserved holes (1021); Concrete (4) is poured above the FRP I-beam (2), and both the FRP perforated plate (1) and the perforated steel bar (3) are located in the concrete (4). 2. A FRP-concrete composite beam shear connector according to claim 1, characterized in that: the bottom plate (101) is provided with several bolt holes I (1011), and several bolt holes I (1011) are respectively on both sides of the connecting plate (102); The FRP I-beam (2) includes an upper flange, a web and a lower flange, and the upper flange of the FRP I-beam (2) is provided with a plurality of bolt holes II (201), and the plurality of bolt holes II (201) are respectively provided. on both sides of the web; Several bolts (5) pass through the bolt hole II (201) and bolt hole I (1011) from the lower end, each bolt (5) is screwed into a nut, and the upper end of the bolt (5) extends into the concrete (4). 3. A kind of FRP-concrete composite beam shear connector according to claim 1, characterized in that: the connecting surface of the bottom plate (101) and the FRP I-beam (2) is coated with epoxy resin glue. 4. An FRP-concrete composite beam shear connector according to claim 1, characterized in that: the width of the bottom plate (101) is smaller than the width of the FRP I-beam (2). 5. An FRP-concrete composite beam shear connector according to claim 2, characterized in that: the connecting plate (102) and the web of the FRP I-beam (2) are on the same vertical plane. 6. A FRP-concrete composite beam shear connector according to claim 1, characterized in that: the bolts (5) are high-strength bolts.

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