JP2014122487A - Pin connection structure for beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it more difficult to transmit bending moment of a beam to a column.SOLUTION: In a pin connection structure for a beam, an end of a concrete beam 2 and a concrete structure part 1 are pin-connected together. A vertical part of the end of the beam 2 is configured as a pin connection part P for transmitting a shear force between itself and the structure part 1, and another part of the pin connection part P at the end of the beam part 2 is configured as a notched part 8 that prevents mutual interference with the structure part 1.

Description

  The present invention relates to a pin connection structure of a beam in which an end portion of a concrete beam portion and a concrete structure portion (for example, a column, a beam, or a wall) are pin-connected.

Conventionally, as a connecting structure of this kind of beam, the beam of a concrete beam is set smaller at the end than at the middle, and the bending moment of the beam is reduced by the resulting decrease in rigidity at the end. There was one that was difficult to be transmitted to a structure part (for example, a pillar) (see, for example, Patent Document 1).
According to this example, the end of the beam part is lower in rigidity than the intermediate part, but the connection to the structure part is made by allowing the fixing beam reinforcements provided at the upper and lower edges to enter the structure part. It is configured as a rigid joint united with concrete.

JP 2001-329714 A (FIG. 15)

According to the conventional beam connecting structure described above, the beam is less rigid at the beam end than at the beam middle, but the beam and the structure are connected at the rigid joint. From the beam to the structural part, not only the shearing force but also the bending moment is transmitted as it is.
As a result, in the column design, in addition to the action of the axial force, a cross-section design that takes into consideration the action of the bending moment from the beam is necessary, and there is a problem that it is inevitable that the column has a large cross section.

  Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a beam pin connection structure in which the bending moment of the beam is less easily transmitted to the column.

  A first characteristic configuration of the present invention is a pin connection structure of a beam in which an end portion of a concrete beam portion and a concrete structure portion are pin-connected, and the upper and lower portions at the end portion of the beam portion. A part in the direction is configured as a pin connection part that transmits a shearing force to and from the structure part, and the other part of the pin connection part at the end of the beam part is between the structure part. It exists in the place comprised as a notch part which prevents mutual interference.

According to the first characteristic configuration of the present invention, it is possible to transmit a shearing force while allowing the beam portion and the structural portion to swing relative to each other in the vertical direction by the pin connecting portion, and the bending acting on the beam portion. The moment can be made difficult to be transmitted to the structure.
In addition, since the other part of the pin connection part provided at the end of the beam part is configured as a notch part, when the beam part swings around the pin connection part, mutual interference with the structure part Can be prevented and the rocking can be performed more smoothly.

  As a result, transmission of the bending moment from the beam part to the column part can be suppressed to an extremely small value (or to the extent that it is not substantially transmitted), and it is not necessary to enlarge the column cross section more than necessary. It is possible to improve the performance.

  Furthermore, since the notch is located between the structure part and the end of the beam part, the space of the notch can be used as an arrangement space for piping, wiring, ducts, and the like.

  According to a second characteristic configuration of the present invention, a steel material different from a beam main bar is embedded in the pin connecting portion over the beam portion and the structure portion, and the beam portion and the structure portion are formed by the steel material. It is configured to support the shearing force between them.

  According to the second characteristic configuration of the present invention, since the shearing force between the beam portion and the structural portion is supported by the steel material, the design of the shearing force support between the beam portion and the structural portion is performed by It can be implemented separately from the design (for example, the number, material, interval, arrangement, etc.), and the design can be made more efficient.

  According to a third characteristic configuration of the present invention, the steel material is embedded in a state of being separated from the beam main bar in the beam portion.

  According to the third characteristic configuration of the present invention, since the stress acting on the beam main bar is not directly transmitted to the steel material, the bending moment of the beam is less likely to act on the pin coupling portion, and a more reliable pin coupling portion. A structure can be formed.

Side view sectional view showing the pin connection structure of the beam and column Plan view showing pin connection structure of beam and column Side view sectional view showing the procedure for connecting beams and columns Side view sectional view showing the procedure for connecting beams and columns Side view showing connecting procedure of beam and column Main part perspective view showing the bar arrangement in the pin connection part between the beam and the column Side view sectional drawing which shows the pin connection part structure of the beam and column of another embodiment Side view sectional drawing which shows the pin connection part structure of the beam and column of another embodiment

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 and FIG. 2 show a “beam pin connection structure” in which the end of a beam (corresponding to a beam) 2 is pin-connected to the side of a column 1A which is an example of the structure 1 Yes.

  The column 1A is made of reinforced concrete and has a rectangular cross section (see FIG. 2). In the cross section, a plurality of main bars arranged along the vertical direction (longitudinal direction of the column) 3 and a plurality of strips 4 arranged so as to surround it.

  The main reinforcing bars 3 are composed of deformed reinforcing bars, for example, and are arranged at the four corners of a rectangular cross section. The main bars 3 may be arranged at intervals along the sides of the rectangular cross section in addition to the four corners.

The band 4 is made of, for example, a deformed reinforcing bar, and is bent into a rectangular shape surrounding the main bar 3, and is arranged at intervals in the longitudinal direction of the column.
In addition, a predetermined reinforcing bar cover of the concrete C is secured outside the main bars 3 and the band bars 4.

The beam 2 is made of reinforced concrete, and the basic cross-sectional structure includes a plurality of beam main bars 5 and stirrup bars 6 and a connecting round steel bar (an example of a steel material) 7 described later.
The end shape of the beam 2 is configured as an inclined surface 2a in which the upper surface of the beam is a horizontal plane and the lower surface of the beam is positioned higher toward the end of the beam (see FIG. 1). That is, the beam end portion is connected to the column 1A only at the upper edge portion of the beam formation, and the connection portion is configured as a pin connection portion P.

Accordingly, as shown in the figure, a notch portion 8 is formed between the inclined surface 2a and the side surface of the column 1A at the beam end portion. For example, the beam 2 swings up and down around the pin connecting portion P. However, it is possible to prevent mutual interference such that the end surface of the beam 2 is in contact with the column 1A and suppresses the movement, and the bending moment is prevented from being transmitted from the beam 2 to the column 1A.
That is, only the shearing force is substantially transmitted at the pin connection portion P between the beam 2 and the column 1A.

The beam main reinforcing bars 5 are composed of, for example, deformed reinforcing bars, and are arranged along the longitudinal direction of the beam, and are provided at intervals in the beam width direction (see FIG. 6).
The beam main reinforcement 5a provided at the upper edge of the beam 2 is used in a straight shape, and the beam reinforcement 5b provided at the lower edge is along the inclined surface 2a of the lower surface of the beam. It is bent into a shape that bends upward on the end side.
In addition, the beam main reinforcing bars 5 are set to have lengths so that the ends of the main bars 5 do not protrude from the beam ends.

The stirrup 6 is composed of, for example, a deformed reinforcing bar or the like, bent into a rectangular shape surrounding the beam main reinforcement 5, and arranged at intervals in the longitudinal direction of the beam 2 (FIGS. 1 and 2). reference).
In addition, a predetermined rebar cover of the concrete C is secured outside the beam main bars 5 and the stirrup bars 6.

The connecting round steel 7 is embedded across the beam 2 and the column 1A, and is configured to support the shearing force between the beam 2 and the column 1A.
The connecting round steel bars 7 are provided at intervals in the beam width direction.
The connecting round bar 7 is embedded inside the beam 2 so as to be separated between the upper and lower beam main bars 5 a and 5 b, and the stress of the beam main bar 5 is directly transmitted to the connecting round bar 7. It is preventing.
The shape of each connecting round steel 7 is “bent” bent, and the bent portion is embedded in the pillar 1A. The fixing length sufficient for both the beam 2 and the pillar 1A. Is secured.

Next, an example of a pin connection procedure between the pillar 1A and the beam 2 will be described.
[1] The main reinforcement 3 and the strip 4 of the pillar 1A, the main reinforcement 5 and the stirrup 6 of the beam 2 and the connecting round bar 7 are assembled, and a series of formwork K of the pillar 1A and the beam 2 is assembled (See FIG. 3).
[2] Concrete C is placed in the beam space V1 and the beam space V2 in the mold K (see FIG. 4).
In addition, although the concrete C placing is stopped at the top of the beam here, the joining height can be arbitrarily set according to the field situation.
[3] After the predetermined curing period of concrete has elapsed, the mold is removed (see FIG. 5).

According to the pin connection structure of the beam of the present embodiment, by providing the pin connection portion P as described above, it becomes possible to allow relative swinging of the beam 2 and the column 1A in the vertical direction. While the shearing force between the columns 1A can be supported, the bending moment of the beam 2 can be made difficult to be transmitted to the columns 1A.
As a result, it becomes unnecessary to secure a column cross-section more than necessary, and it becomes possible to improve economy.
The notch 8 at the end of the beam can be used as an arrangement space for piping, wiring, ducts, etc., for example, and the space under the beam can be used effectively.
Further, even if the beam main reinforcing bar 5 is extended to the inside of the column 1A to constitute the pin connecting portion P, it is possible to transmit the shearing force between the beam 2 and the column 1A. In this embodiment, a connecting round bar 7 different from the beam main bar 5 is used, and further, since this connecting round bar 7 is fixed to be separated from the beam main bar 5, the transmission of the shear force is as follows. Although it can be realized, the bending moment of the beam 2 is hardly transmitted to the column 1A, and a more reliable pin connection part structure can be formed.

[Another embodiment]
Other embodiments will be described below.

<1> The structure part 1 and the beam part 2 to be pin-coupled are not limited to those described in the previous embodiment, and the following alternatives are possible.
For example, the structure portion 1 is not limited to the pillar 1A described in the previous embodiment, and may be, for example, a beam or a wall, and collectively includes the structure portion 1.

<2> The pin connection portion P is not limited to being formed at the upper edge portion at the beam end portion as described in the previous embodiment. For example, as shown in FIG. You may form in the intermediate part in a direction. In this case, the notch portion 8 is formed separately above and below the pin connecting portion P.
Further, although not shown in the drawing, the pin connecting portion P may be formed at the lower edge portion at the beam end portion.

<3> The steel material 7 embedded in the pin connecting portion P is not limited to the connecting round steel described in the previous embodiment, and may be formed of a deformed reinforcing bar, for example.
In addition, the steel material 7 is not limited to being composed of a material different from the beam main reinforcing bar 5, and may be configured, for example, by extending the beam main reinforcing bar 5 from the beam end portion into the column 1 </ b> A.
Further, the steel material 7 itself is not limited to a rod-shaped body such as a reinforcing bar, and may be constituted by, for example, a steel plate 9 disposed over the beam 2 and the column 1A as shown in FIG.
In this case, as shown in the figure, it is preferable that the steel plate 9 is provided with a plurality of studs 9a on the front and back sides to enhance the adhesion with the concrete C.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

1 Structure 2 Beam (equivalent to beam)
5 Beam reinforcement 7 Round steel for connection (example of steel)
8 Notch P Pin connection

Claims (3)

It is a pin connection structure of a beam in which an end portion of a concrete beam portion and a concrete structure portion are pin-connected,
A part in the vertical direction at the end of the beam part is configured as a pin connection part that transmits a shearing force between the structure part,
The other portion of the pin connecting portion at the end of the beam portion is a beam pin connecting structure configured as a notch portion that prevents mutual interference with the structure portion.   A steel material different from the main beam of the beam is embedded in the pin connecting portion across the beam portion and the structure portion, and the steel member is configured to support a shearing force between the beam portion and the structure portion. The beam pin connection structure according to claim 1.   The beam pin connection structure according to claim 2, wherein the steel material is embedded in the beam portion so as to be separated from the beam main reinforcing bar.

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