JPH07331741A - Column-beam joint structure - Google Patents

Abstract

PURPOSE:To prevent the bearing destruction of a reinforced concrete column or the like so as to improve the reliability of a structure with reinforced concrete columns and steel beams by improving bearing yield strength in a column- beam joint part in this structure. CONSTITUTION:In column-beam joint structure with a vertical reinforced concrete column 2 and a horizontal steel beam 6 jointed to each other in the state or forming a panel part put, the column 2 is provided with a frame like closing plate 7 in the state of surrounding the panel part PN1, and the upper or lower part of the beam 6 is provided with an auxiliary metal fitting 9 in the state of being embedded in the column 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column / beam joint structure formed by joining a reinforced concrete column and a steel frame beam.

[0002]

2. Description of the Related Art Conventionally, a column RC beam S structure composed of a reinforced concrete column and a steel frame beam has been constructed.

[0003]

However, in the above-mentioned column RC beam S structure, the load on the steel frame beam is transmitted to the column side as a so-called leverage reaction force, and the leverage reaction force acts as a supporting pressure to form a reinforced concrete column. Concentrate on column-beam joints in. Therefore, in the column RC beam S structure, the bearing capacity of the column-beam joint is improved to prevent bearing failure of the reinforced concrete column and the like, and the reliability of the column RC beam S structure is improved. Is desired. Therefore, in view of the above circumstances, the present invention improves the bearing capacity of the column-beam joint in the column RC beam S structure,
To provide a column-beam joint structure capable of preventing bearing failure of a reinforced concrete column or the like and improving reliability of the column RC beam S structure.

[0004]

[Means for Solving the Problems] That is, the first invention of the present invention is a vertical column structure (2) made of reinforced concrete.
And a horizontal steel beam (6) are joined to each other to form a column-beam joint (PN1), in the column-beam joint structure, a frame-shaped reinforcing plate (7) is attached to the column body (2). ) Is provided so as to surround the column-beam joint (PN1) of the column body (2), and a stress transmission assisting member (9) is provided above or below the steel beam (6). (9) is provided so as to be embedded in the pillar structure (2). A second invention of the present invention is, in the column-beam joint structure according to the first invention, the stress transmission assist in a direction perpendicular to a beam installation direction (arrows A and B directions) of the steel beam (6). The width (W1) of the member (9) is made larger than the beam width (W2) of the steel beam (6). The third invention of the present invention is
In the column-beam joint structure according to the first aspect of the present invention, the stress transmission assisting member (9) is provided with a vertical bearing support portion (9b) protruding in the vertical direction. A fourth invention of the present invention is, in the column-beam joint structure of the second invention, a protruding portion (9d) protruding laterally of the steel beam (6) of the stress transmission assisting member (9). A rebar insertion hole (9c) penetrating the protrusion (9d) in the up-down direction, and a rebar (3) in the up-down direction in the pillar structure (2) is inserted into the rebar insertion hole (9c). It is configured by arranging in the form of. The numbers in parentheses () indicate the corresponding elements in the drawings for convenience, and therefore the present description is not limited to the description in the drawings. The same applies to the following action columns.

[0005]

According to the first aspect of the present invention having the above-described structure, in the portion of the pillar structure (2) surrounded by the reinforcing plate (7), the concrete of the pillar structure (2) is reinforced by the reinforcing plate (7). In the bearing pressure region (JS1) that is constrained by the upper and lower sides of the steel beam (6) of the column structure (2), not only the upper surface or the lower surface of the steel beam (6) but also the stress. The pressure is also supported by the surface of the transmission assisting member (9) and the like. Further, in the second aspect of the present invention, the bearing area supporting the bearing area (JS1) of the column body (2) is as perpendicular as possible to the direction perpendicular to the beam installation direction (AB) of the steel beam (6). Has been made larger. Further, in the third invention of the present invention,
The bearing surface on which the vertical bearing portion (9b) bears the bearing area (JS1) of the column body (2) is formed to extend vertically above or below the steel beam (6). The bearing area is enlarged in the direction away from the fulcrum of the lever reaction force supporting the bearing area (JS1) in the vertical direction. Also,
In the fourth aspect of the present invention, when the pillar frame (2) and the steel frame beam (6) are joined, when the steel frame beam (6) is installed on the upper end side of the column frame body (2) under construction. So that a predetermined reinforcing bar (3) protruding above the column frame (2) is inserted into the reinforcing bar insertion hole (9c) of the stress transmission assisting member (9) installed in the steel beam (6). Position and install the steel beam (6). Further, the space between the steel beam (6) and the reinforcing bar (3) inserted and penetrating into the reinforcing bar insertion hole (9c) of the stress transmission assisting member (9) is restrained.

[0006]

1 is a side view showing an example of a column-beam joint structure according to the present invention, and FIG. 2 is a sectional view taken along line X1-Y1 of FIG.

The column-beam structure 1 which is a column RC beam S structure is
As shown in FIG. 1 and FIG. 2, it has a plurality of columns 2 made of reinforced concrete which are vertically erected on a foundation (not shown) (note that only one column 2 is shown in the figure). Pillar 2
Inside, a plurality of main bars 3 arranged appropriately in the vertical direction, and
A plurality of hoop muscles 5 arranged appropriately in the horizontal direction are embedded. Each pillar 2 has a predetermined height level L1 (eg,
Corresponding to the level at which the floor slab will be constructed in the future), a plurality of horizontal beams 6 made of an H-shaped steel frame composed of two horizontal flange portions 6a, 6a and a vertical web portion 6b are joined and provided, The plurality of beams 6 at each predetermined height level L1 are connected to each other at the joints PT1 between the beams 6 (only the cross-shaped joints PT1 are shown in the drawing, but joints such as T-shapes and L-shapes). (A location PT1 may also be present) is joined to and supported by each pillar 2. The joint portion between the joint portion PT1 of the beam 6 and the column 2 is a panel portion PN1.

The structure of the panel portion PN1 is configured such that the joint portion PT1 of the plurality of beams 6 is buried in the concrete frame of the pillar 2 at the predetermined height level L1 of the pillar 2. Further, in each panel portion PN1, a covering plate 7 made of a frame-shaped steel plate is installed so as to surround the horizontal periphery of the concrete frame of the pillar 2, and the covering plate 7 is joined at the panel portion PN1. The beam 6 is installed in the upper and lower range corresponding to the web portion 6b of the beam 6. The beam 6 joined at the panel portion PN1 is in a state of penetrating the blocking plate 7, and a plurality of steel plate pieces of the blocking plate 7 are appropriately welded and joined between each steel plate piece and the beam 6. It is molded and installed by In addition,
The hoop streak 5 is omitted in the part of the pillar 2 where the blocking plate 7 is installed, but since the blocking plate 7 made of a steel plate is installed around the part, in the panel portion PN1. The columns 2 are sufficiently reinforced against shear stress and the like. In addition, in the panel portion PN1, the pillar 2
The main bars 3 are arranged so as to pass through in the vertical direction so as to avoid the plurality of beams 6 joined to the panel portion PN1.

In the panel portion PN1 of each beam 6, an auxiliary metal fitting 9 made of an L-shaped steel material is provided on the pillar 2 of the panel portion PN1.
The auxiliary metal fittings 9 are provided by being welded to the upper portion of the upper flange portion 6a of the beam 6 and the lower portion of the lower flange portion 6a of the beam 6 as a pair of upper and lower portions, respectively. Has been. For example, when the joint portion PT1 of the beam 6 joined at the panel portion PN1 is a cross-shaped joint portion PT1 as shown in the figure, the joint portion PT1
One set is provided for each of the four branch portions 6c projecting around. In addition, the auxiliary metal fitting 9 which is an L-shaped steel material includes a horizontal rectangular plate-shaped base portion 9a that is eccentric in one direction, that is, the arrow E and F directions, and the eccentric direction of the base portion 9a, that is, the arrow E and F directions. It is composed of a vertical rectangular plate-shaped vertical support portion 9b that is biased in the same direction as, and the auxiliary metal fitting 9 and the flange portion 6a are joined to each other by connecting the base portion 9a and the upper surface (or the lower surface) of the flange portion 6a. It is done by joining. Further, each auxiliary metal fitting 9 has its elongated direction, that is, the arrow E and F directions, the extending direction of the joined beam 6, that is, the arrow A and B directions (however, the arrow A and B directions are the extending directions of the beam 6). Of the directions, the direction toward the panel portion PN1 and the direction away from the panel portion PN1 are respectively shown), and the vertical support portions 9b of the auxiliary metal fittings 9 are provided on the outer peripheral surface 2 of the column 2.
It is arranged in a form corresponding to a (in the figure, the surface of the vertical support portion 9b is exposed to the outside of the column 2. That is, the auxiliary metal fitting 9 is partially buried in the column 2. Although provided, the vertical support portion 9b is completely buried in the pillar 2,
Therefore, the auxiliary metal fitting 9 may be provided so as to be completely buried in the pillar 2. ). The width W1 of the auxiliary metal fitting 9 in the eccentric direction, that is, in the directions of the arrows E and F is larger than the width W2 of the flange portion 6a of the beam 6. Therefore, the widths W1 and W2
Due to this difference, the portions of the auxiliary metal fitting 9 that project laterally of the beam 6 are projections 9d and 9d. Also, auxiliary metal fittings 9
Of the protrusions 9d and 9d of the
c are provided as appropriate (in the figure, one for each of the protrusions 9d and 9d), and some of the main bars 3 of the pillar 2
Is arranged by passing through the reinforcing bar insertion hole 9c in the vertical direction (the auxiliary metal fitting 9 and the main bar 3 penetrating the reinforcing bar insertion hole 9c may be welded together). ).

In the column-beam structure 1 configured as described above, for example, as shown in FIG. 1, when an upward load F1 acts on a branch portion 6c of the beam 6 that protrudes to the right side of the paper surface of FIG. The lever reaction force of the load F1 is transmitted to the panel portion PN1 with the joint portion PT1 of the branch portion 6c or the branch portion 6c (on the left side of the paper of FIG. 1) symmetrical to the branch portion 6c as a fulcrum. It Therefore, in the body of the pillar 2, the panel portion PN1
The pressure bearing areas JS1 and JS2 adjacent to the upper surfaces of the upper and lower flange portions 6a and 6a of the branch portion 6c, respectively, are formed as areas for receiving the bearing stresses G1 and G2 due to the lever reaction force. By the way, the branch portion 6c (see FIG.
Since the auxiliary metal fitting 9 is provided on the upper surface of the upper side flange portion 6a (on the right side of the drawing), the pressure receiving / supporting area JS1 of the column 2 is provided.
Is supported not only by the upper surface of the flange portion 6a but also by the base portion 9a and the vertical support portion 9b of the auxiliary metal fitting 9. That is, the bearing area for bearing the bearing area JS1 of the column 2 is
Not only the area of the upper surface of the flange portion 6a but also the surface areas of the base portion 9a and the vertical support portion 9b are added. Further base 9a
Since the width W1 is larger than the width W2 of the flange portion 6a, the bearing area for bearing the bearing pressure region JS1 is made as large as possible. That is, since the bearing area when the bearing stress G2 bears the bearing bearing area JS1 of the column 2 is made as large as possible, the bearing stress G1 is not locally concentrated as much as possible, and thus the bearing stress G2 is obtained. The bearing capacity of the panel portion PN1 that can counter the above is relatively improved. Further, the vertical support portion 9b of the auxiliary metal fitting 9 is provided so as to extend above the flange portion 6a on the upper side of the branch portion 6c (on the right side of the drawing in FIG. 1), and therefore the vertical support portion 9b receives the bearing pressure. The plate surface that supports the region JS1 is also provided so as to extend above the flange portion 6a. That is, the bearing pressure region JS1
The bearing area for bearing the pressure is determined by the vertical support portion 9b of the auxiliary metal fitting 9 by the joint portion P of the branch portion 6c (on the right side of the drawing in FIG. 1).
It is enlarged in the direction away from the fulcrum of T1 or the branch portion 6c (on the right side of the paper surface of FIG. 1) and the branch portion 6c (on the left side of the paper surface of FIG. 1) symmetrically located. That is, since the stress center of the bearing stress G1 is set to move away from the fulcrum by the installation of the auxiliary metal fitting 9, the magnitude of the bearing stress G1 at the stress center is relatively small. , In the bearing pressure region JS1, the bearing stress G1
The bearing capacity that can counter the above is relatively improved. In the pressure receiving and supporting region JS2 adjacent to the upper surface of the lower flange portion 6a of the branch portion 6c (on the right side of the drawing in FIG. 1), since the covering plate 7 is installed around the column 2, The concrete in the pressure region JS2 is sufficiently restrained, and therefore the bearing capacity that can resist the bearing stress G2 is improved.
Therefore, even when the upward load F1 is applied to the branch portion 6c, the bearing capacity of the panel portion PN1 is improved, so that the bearing failure of the column 2 due to the reinforced concrete does not occur.

In the above description, the case where the upward load F1 is applied to the branch portion 6c has been described, but the panel portion PN1 is used.
Since the structure of (1) is vertically symmetrical (that is, since the auxiliary metal fittings 9, 9 are vertically symmetrical), the branch portion 6c is formed.
Similarly, when a downward load F1 (not shown) acts on the column 2, since the bearing capacity of the panel portion PN1 is improved, bearing failure of the column 2 by reinforced concrete does not occur. That is, in the beam structure 1, the panel portion P
The bearing capacity at N1 is improved, and the reliability of the column / beam structure 1 is improved. Further, since the main bar 3 is inserted through the reinforcing bar insertion hole 9c of the auxiliary fitting 9, the main bar 3 and the beam 6 are restrained via the auxiliary fitting 9. Therefore, the stress due to the load F1 on the beam 6 is effectively transmitted to the main reinforcement 3 in the column 2 and concentration on the concrete in the column 2 is prevented, so that the bearing capacity of the panel portion PN1 is improved, The reliability of the structure 1 is further improved.

Next, the construction of the beam structure 1 is carried out as follows. That is, after appropriately constructing a foundation (not shown), a plurality of columns 2 made of reinforced concrete are cast on the foundation at a predetermined height level (for example, the height level L).
Build up to near 1). Next, a plurality of beams 6 are installed on the constructed upper ends of the columns 2. Multiple beams 6
Is installed in such a manner that each joint portion PT1 formed by joining the beams 6 to each other is placed on the constructed upper end of each pillar 2. Further, when installing the beam 6 on the upper end of the pillar 2, a predetermined main bar 3 protruding above the pillar 2 is inserted into a reinforcing bar insertion hole 9c provided in an auxiliary metal fitting 9 previously installed on the beam 6.
The beam 6 is positioned and installed so that That is, the beam 6 is formed by inserting the predetermined main bar 3 into the reinforcing bar insertion hole 9c.
The positioning work is performed accurately and easily. Next, the main bars 3 of the plurality of columns 2 are arranged further upward, the plurality of hoop bars 5 are arranged with respect to the main bars 3, and each of the mounted joint portions PT1, that is, the panel portion to be constructed. The cover plate 7 in a form corresponding to PN1
Is installed (in addition, a predetermined formwork (not shown) is installed on the construction portion of the pillar 2 above the panel portion PN1).
As described above, the blocking plate 7 is appropriately welded and installed on site in the form of forming a plurality of steel plate pieces into a frame shape.

Next, by concrete pouring on site,
Main bar 3 in which concrete is filled in the inside of a mold plate (not shown) above the cover plate 7 and the cover plate 7
A plurality of pillars 2 are moved to the next predetermined height level (for example, the height level L by burying the hoop muscles 5 and the auxiliary metal fittings 9).
1 up to a predetermined height level, etc.). After that, a plurality of beams 6 are installed on the constructed upper ends of the pillars 2, respectively, and the main bars 3 and the hoop bars 5 of the pillars 2 are arranged and the cover plate 7 is arranged.
The construction of the beam structure 1 is completed by repeating the above-mentioned series of operations, in which the concrete columns are installed and concrete is poured to construct the columns 2 to the next predetermined height level.

[0014]

As described above, according to the first invention of the present invention, the pillar frame body such as the vertical pillar 2 made of reinforced concrete and the steel frame beam such as the horizontal beam 6 make the pillars such as the panel portion PN1. In a pillar-beam joint structure that is joined to each other to form a beam joint, a reinforcing plate such as a frame-shaped blocking plate 7 is attached to the pillar skeleton so as to surround the pillar-beam joint of the pillar skeleton. Provided, the upper or lower part of the steel beam (only upper part, only lower part,
A stress transmission auxiliary member such as an auxiliary metal fitting 9 is embedded in the upper part and the lower part (including the respective cases), and the stress transmission auxiliary member is embedded in the column structure (including partial burial and complete burial).
In the column RC beam S structure, the load on the steel frame beam is transmitted to the column side as a lever reaction force, and the lever reaction force serves as a supporting pressure to connect the column and beam in the reinforced concrete column. However, in the part of the pillar structure surrounded by the reinforcing plate, the concrete of the pillar structure is sufficiently restrained by the reinforcing plate, and the bearing pressure that can counter the bearing pressure transmitted from the steel beam. The yield strength has been improved. Also, since a stress transmission assisting member is provided,
The pressure receiving / supporting area JS1 on the upper side or the lower side of the steel beam of the column structure is supported by not only the upper surface or the lower surface of the steel beam but also the surface of the stress transmission assisting member or the like. That is, not only the upper surface or the lower surface of the steel beam but also the surface of the stress transmission assisting member is added to the bearing area that bears the bearing area JS1 of the column body, and thus the bearing area JS1 is supported. The bearing area is maximized. Therefore, in the bearing pressure region JS1 of the column structure, the bearing pressure transmitted from the steel beam is locally not concentrated as much as possible, so that the bearing pressure can be counteracted in the bearing pressure region JS1. Bearing capacity is relatively improved. As described above, in the present invention, the bearing capacity of the column-beam joint is improved, and therefore, the bearing failure of the column frame made of reinforced concrete is prevented, and the reliability of the column RC beam S structure is improved. Has been done.

A second invention of the present invention is the column-beam joint structure according to the first invention, wherein the arrows A and B of the steel beam are used.
Since the width of the stress transmission assisting member width W1 and the like in the direction perpendicular to the beam installation direction such as the direction is made larger than the beam width of the steel beam, such as the width W2, the effect of the first invention In addition to this, the bearing area for bearing the bearing area JS1 of the column body is maximized. In other words, in the bearing pressure region JS1,
Since the bearing pressure transmitted from the steel beam is not locally concentrated as much as possible, in the pressure bearing region JS1,
The bearing pressure resistance that can counter the bearing pressure is relatively improved. Therefore, the bearing capacity of the column-beam joint is further improved, and the reliability of the column RC beam S structure is further improved.

A third aspect of the present invention is the column-beam joint structure according to the first aspect, wherein the stress transmission assisting member is provided with a vertical pressure supporting portion such as a vertical supporting portion 9b protruding vertically. In addition to the effect of the first aspect of the invention, in addition to the effect of the first invention, the bearing surface where the vertical bearing support portion bears the bearing area JS1 of the column frame extends vertically above or below the steel beam. Is formed by. That is, the bearing area is enlarged vertically by the stress transmission assisting member in the direction away from the fulcrum of the lever reaction force that bears the bearing area JS1. That is, the stress center of the bearing pressure for the bearing pressure region JS1 is arranged to be as far away as possible in the vertical direction from the fulcrum, so that the bearing pressure at the stress center is relatively small. In the bearing area JS1, the bearing capacity that can counter the bearing pressure is relatively improved.
Therefore, the bearing capacity of the column-beam joint is further improved, and the reliability of the column RC beam S structure is further improved.

A fourth aspect of the present invention is the column-beam joint structure according to the second aspect, wherein a protrusion such as a protrusion 9d protruding laterally of the steel frame beam is included in the stress transmission assisting member. Reinforcing bar insertion holes such as reinforcing bar insertion holes 9c penetrating the protruding portion in the vertical direction are provided, and reinforcing bars such as the vertical main bars 3 in the pillar structure are inserted and inserted into the reinforcing bar insertion hole. In addition to the effect of the second invention, when connecting the pillar frame and the steel beam, when installing the steel beam on the upper end side of the column frame in the process of construction, install it on the steel beam. The steel beam can be positioned and installed so that a predetermined reinforcing bar projecting above the column body is inserted into the reinforcing bar insertion hole of the stress transmission assisting member. That is, the steel beam to be installed can be accurately and easily positioned. Further, since the restraint between the steel beam and the reinforcing bar inserted through the reinforcing bar insertion hole of the stress transmission assisting member is easily realized, the stress due to the load on the steel beam is effectively transferred to the reinforcing bar in the column structure, Since the concentration of concrete in the column body is prevented, the bearing capacity of the column-beam joint is improved, and the reliability of the column RC beam S structure is improved.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a column-beam joint structure according to the present invention.

2 is a cross-sectional view taken along line X1-Y1 of FIG.

[Explanation of symbols]

 2 ………… Pillar body (pillar) 3 ……… Reinforcing bar (main bar) 6 ……… Steel beam (beam) 7 ……… Reinforcing plate (blocking plate) 9 ……… Stress transmission auxiliary member (auxiliary metal fitting) 9 b… …… Vertical bearing support part (vertical support part) 9c ………… Reinforcing bar insertion hole 9d ………… Projection part Arrow A, B direction ………… Beam installation direction PN1 ………… Column / beam joint (panel part) W1 ……… Width W2 ………… Beam width (width)

Claims (4)

[Claims] 1. A column-beam joint structure in which a vertical column body made of reinforced concrete and a horizontal steel beam are joined together to form a column-beam joint, wherein a frame-shaped reinforcement is provided on the column body. A plate is provided so as to surround the column-beam joint portion of the column structure, and a stress transmission auxiliary member is provided in an upper portion or a lower portion of the steel frame beam so that the stress transmission auxiliary member is embedded in the column structure. Structured column-beam joint structure. 2. A direction perpendicular to a beam installation direction of the steel frame beam,
The column-beam joint structure according to claim 1, wherein a width of the stress transmission assisting member is larger than a beam width of the steel beam. 3. The column-beam joint structure according to claim 1, wherein the stress transmission assisting member is provided with a vertical bearing support portion protruding in the vertical direction. 4. The column-beam joint structure according to claim 2,
Of the stress transmission assisting member, a projecting portion that projects laterally of the steel beam is provided with a reinforcing bar insertion hole that penetrates the projecting part in the vertical direction, and the reinforcing bar in the vertical direction in the column structure is the reinforcing bar insertion hole. A column-beam joint structure constructed by arranging the bars so that they are inserted and penetrated.