JPH01304236A - Joint structure for column and beam - Google Patents

Abstract

PURPOSE:To secure the strength and rigidity of column flanges by a method in which a strip of steel is wound around the periphery of a flange constituting a steel column, and a joint metal is welded to the end of a steel beam and connected with the flange in such a way as to hold the strip. CONSTITUTION:A strip 7 of steel as a structural material is wound around the periphery of a flange 1a forming a steel column, and a joint metal 3 is welded to the end of a steel beam 2 and fixed to the periphery of the flange 1a of the steel column 1 in such a way as to hold the strip 7 between the flange 1a and the metal 3 through bolts 4 and nuts 5. A tension force from the flange 2a of the beam 2 is dispersed to the metal 3 the bolts 4 the flange 1a of the column 1 the web 1b of the column 1 and also to the metal 3 the bolts 4 the flange 1a of the column 1 the strip 7 the other flange 1a of the column 1. The concentration of stress on the web 1b can thus be avoided.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a joint structure between a column and a beam in a steel structure, a steel reinforced concrete structure, or a mixed structure formed by a combination of a steel structure and a steel reinforced concrete structure. be.

[Conventional technology]

Conventionally, when joining a steel column and a steel beam through a joining hardware, the joining hardware is fixed to the steel beam by welding, and the joining hardware is connected to the steel column with bolts and nuts. It is used. FIGS. 11 and 12 are a sectional plan view and a sectional front view, respectively, showing an example of a conventional pillar-to-beam joint structure. In both figures, the pillars are integrally formed by combining H-shaped steel in a cross shape.
A joining hardware 3 is fixed by welding to the end of a beam 2 made of II section steel, and the joining hardware 3 and the flange 1a of the column 1 are connected by connecting bolts 4 and nuts 5. 6 is a stiffener; 6. Flange 2 of tsu2
It is installed in the pillar 1 corresponding to a.

[Problem to be solved by the invention]

In the joint structure between the pillar 1 and the beam 2 having the above configuration, the fixed part between the joining hardware 3 and the beam 2 is the flange 2 of the beam 2.
Since a is fixed to the joining hardware 3 by butt welding of the entire cross section, sufficient strength and rigidity can be ensured.

However, the joining hardware 3 and the pillar 1 are connected to the connecting port I.
4 and nuts 5, the tensile force transmitted from the flange 2a of the beam 2
The strength and rigidity of the out-of-plane embossment of the flange 1a may be insufficient. For example, there is a problem in that the flange 1a of the column 1 may locally deform out of plane during an earthquake or a storm. In addition, in order to ensure the strength and rigidity of the out-of-plane projection of the flange 1a of the column 1, there is a means for fixing a cover plate (not shown) to the inside of the flange 1a.
If the web 1b of
(not shown) is required. Therefore, the addition of the cover plate and other reinforcing materials not only increases the weight of the steel column but also increases the number of processing steps, which is disadvantageous economically. In addition, in the joint structure between the pillar 1 and the beam 2 having the above configuration, since the joining hardware 3 and the pillar 1 are connected by the connecting bolt 4, it is necessary to provide a bolt hole in the flange 1a of the pillar 1. This results in a reduction in the cross-sectional area of the pillar 1 at the joint. This means that the strength of the column l is degraded at the joint, which poses the problem of lowering the seismic performance of the building.

It is an object of the present invention to solve the problems existing in the above-mentioned prior art, to ensure the strength and rigidity of a column flange, and to provide an economical column-to-beam joint structure with good earthquake resistance.

[Means to solve the problem]

In order to achieve the above object, the present invention has the following features.

In the joint structure between a steel column and a steel beam, a band member made of a steel plate is provided around the outer periphery of the flange that forms the steel column, and joining hardware is welded and fixed to the end of the steel beam, and a connecting bolt is attached to the end of the steel beam. - Connect the flange and the joining hardware via a nut so as to sandwich the band member.

This technical method was adopted.

By configuring the band member to be divided into multiple parts in the axial direction and/or outer circumferential direction of the column, manufacturing and/or
Alternatively, attachment of the strip member to the column flange can be facilitated.

[Effect]

The above configuration ensures the strength and rigidity of the out-of-plane flange of the single column flange, and also distributes the tensile force transmitted from the beam flange to other flanges via the band member. This can be expected to have the effect of avoiding the concentration of applications on

〔Example〕

1 and 4 are a sectional plan view and a sectional front view of a main part showing a first embodiment of the present invention, respectively, and the same parts are designated by the same reference numerals as in FIGS. 11 and 12. show. In FIGS. 1 and 2, 7 is a band member, which is made of a structural material such as a steel plate, and is attached to the flange 1a of the column 1.
It is installed so that it goes around the outer periphery of. and connecting bolt 4
and the flange 1 of the column I so that the band member 7 is sandwiched between the flange 1a and the joining hardware 3 via the nut 5.
It is fixed to the outer periphery of a.

With the above configuration, the tensile force transmitted from the flange 2a of the beam 2 to the joining hardware 3. Connecting bolt 4゜Flange la of column 1, web 1b of column 1, and connecting hardware 3
．． Connection bolt 4. Flange la of pillar 1, band member 7. Pillar 1
Since the other flange 1a (the flange la orthogonal to the flange 1a) is dispersed, problems such as destruction or deformation due to concentration of stress on the web 1b of the column 1 can be prevented.

FIG. 3 is a sectional plan view of main parts showing a second embodiment of the present invention. In FIG. 3, 7a is a divided piece.

The band member 7 is formed by a structural member such as a steel plate into a substantially trapezoidal shape, and is integrally formed with an adjacent divided piece 7a at the center of the flange 1a by welding.

By dividing the band member 7 into a plurality of pieces in the direction of the outer circumference of the column 1 in this manner, manufacturing and/or attachment of the band member 7 to the column 1 can be facilitated.

FIG. 4 is a front view of main parts showing a third embodiment of the present invention.

FIG. 4 shows an example in which the band member 7 is divided in the axial direction of the column 1. Note that 4a is a bolt hole formed so that the connecting bolt 4 can be inserted therethrough.

Further, 7b is a divided portion, which is a portion that is integrated by fitting the two parts in the same way as in the previous embodiment.

The effect when the band member 7 is divided and formed as described above is the same as that of the previous embodiment.

5 and 6 are a cross-sectional plan view and a cross-sectional front view of a main part showing a fourth embodiment of the present invention, respectively, and the same parts are designated by the same reference numerals as in the previous embodiment. Figures 5 and 6
In the figure, reference numeral 28 denotes a through hole for reinforcing bars, which is bored in a portion of the band member 7 that does not come in contact with the flange 1a, and allows the main reinforcing bars 9 to be inserted therethrough.

10 is the main column reinforcement.

With the above configuration, concrete 11 can be placed inside the pillar 1 and outside of the pillar 1 and the beam 2. Therefore, the joint structure using the band members 7 having reinforcing and stress dispersion functions can be applied not only to the steel structure in the above embodiment but also to a steel reinforced concrete structure.

7 and 8 are a cross-sectional plan view and a cross-sectional front view of a main part, respectively, showing a fifth embodiment of the present invention, in which concrete 11 is poured inside and outside a column 1, and a beam 2 is in a steel frame state. This is an example of a mixed structure used in

In this case, since the main beam reinforcement 9 as shown in FIGS. 5 and 6 is not installed, the structure of the band member 7 is the same as that shown in FIGS. 1 to 4.

The effect is also similar.

FIG. 9 is a cross-sectional plan view of a main part showing a sixth embodiment of the present invention, and is an example in which concrete 11 is poured only inside a column 1.

By configuring in this way, the above-mentioned figures 5 to 8
Similar to the embodiment shown in the figures, the strength and rigidity of the column 1 can be increased. Namely.

Due to the concrete 11 present inside the flange 1a, inward deformation of the flange 1a can be prevented.

FIG. 10 is an enlarged sectional view of a main part showing a seventh embodiment of the present invention. In the tenth cabinet, 4b is a bolt hole, which is bored in the flange 1a and allows the connection bolt 4 to be inserted therethrough. In this case, the inner diameter of the bolt hole 4a provided in the band member 7 is the inner diameter of the bolt hole 4b provided in the flange 1a (according to the Enforcement Order of the Building Standards Act, if the diameter d of the connecting bolt 4 is less than 20 mm, d + 1.0 m, d When the diameter is 20.times.1 or more, the connecting bolt 4 can be easily inserted by forming the diameter larger than a+1.5.times.1). In other words, when the bolt holes 4a and 4b are bored simultaneously after the band member 7 is fixed to the flange 1a by welding, for example, it is easy to make the bolt holes 4a and 4b coaxial, but it is easy to make the bolt holes 4a and 4b coaxial. If the hole is drilled in the
When installing the flange 1a of the band member 7, the bolt holes 4a, 4
Coaxial alignment of b becomes complicated. Therefore, if the bolt holes 4a are made larger than the bolt holes 4b, attachment of the band member 7 to the flange 1a can be facilitated.

In this example, an example was shown in which the columns were combined in a criss-cross shape using H-shaped steel, but in the case of a cross-sectional cross section of H-shaped steel and angle-shaped steel, in the case of a single H-shaped steel, and in the case of a steel plate welded The effect is similar even when the columns are combined in a cross-sectional shape. Further, the width, thickness, number of divisions, etc. of the band member can be appropriately selected by taking into consideration the shape, dimensions, magnitude of external force acting on the column and beam, the number of work steps, etc. Furthermore, by welding and fixing the band member to the flange of the column and integrating it, it is possible to prevent performance deterioration (reduction in strength) of the column caused by a cross-sectional defect at LJ in the bolt hole portion of the column. Furthermore, the planar projected contour of the band member is not limited to the large rectangular shape shown in this embodiment, and it goes without saying that other geometric shapes can be selected.

〔Effect of the invention〕

Since the present invention has the structure and operation as described above,
You can expect the following effects.

(1) Correct the lack of strength and rigidity of the flange of the steel column without increasing the number of man-hours required for machining the steel frame.

The lack of strength in the web of steel columns can be resolved, and the earthquake resistance of the joints between columns and beams can be greatly improved.

(2) Deterioration in the performance of steel columns due to drilling bolt holes through which connecting bolts are inserted can be eliminated, and a joint between columns and beams with excellent earthquake resistance can be obtained.

(3) The filling properties of concrete in steel-framed reinforced concrete columns are improved, and the quality of the steel-framed reinforced concrete columns can be improved.

(4) It is also possible to avoid deterioration in performance due to loss of the cross section of the column at the joint, and it is possible to prevent a decline in the seismic performance of the building.

[Brief explanation of the drawing]

1 and 2 are a sectional plan view and a sectional front view of a main part showing a first embodiment of the present invention, respectively, and FIG. 3 is a sectional plan view of a main part showing a second embodiment of the invention. FIG. 4 is a front view of main parts showing a third embodiment of the present invention. 5 and 6 are a cross-sectional plan view and a cross-sectional front view of a main part, respectively, showing a fourth embodiment of the present invention, and FIGS.
9th threshold is a cross-sectional plan view of a main part and a cross-sectional front view of a main part showing a fifth embodiment of the present invention, a ninth threshold is a cross-sectional plane view of a main part showing a sixth embodiment of the present invention, and FIG. FIGS. 11 and 12 are an enlarged cross-sectional view of a main part showing the seventh embodiment, and a cross-sectional plan view and a front cross-sectional view of a main part, respectively, showing an example of a conventional pillar-to-beam joint structure. 1: Column, 1a: Flange, 2: Beam, 7: Band member.

Claims (3)

[Claims] (1) In the joint structure between a steel column and a steel beam, a band member made of a steel plate is provided around the outer periphery of the flange that forms the steel column, and joining hardware is welded and fixed to the end of the steel beam, and the connection is made. A joint structure between a pillar and a beam, characterized in that the flange and joining metal fittings are connected to each other via bolts and nuts for clamping the band member. (2) Claim (1) in which the band member is divided into multiple parts in the axial direction of the column.
The joint structure of the pillar and beam described. (3) The column-to-beam joint structure according to claim (1) or (2), wherein the band member is formed by welding and integrating a plurality of divided pieces in the outer circumferential direction of the column.