JP2001152550A - Semi-rigid-connected column/beam connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: Tp provide a column/beam connection structure capable of reducing the response of a building without being damaged at an earthquake. SOLUTION: A steel frame column and a steel frame beam made of an H-steel are semi-rigid-connected with an end plate, high-strength bolts, and nuts to form this column/beam connection structure. The end plate is fitted to the end face section of the steel frame beam, and the end plate of the steel frame beam and the flange portion of the steel frame column are connected by a plurality of high-strength bolts having washer members between them and between at least one of them and bolt head sections or nuts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a beam-column joint structure in which an H-shaped steel column and a steel beam are semi-rigidly joined by an end plate and high-strength bolts and nuts.

[0002]

2. Description of the Related Art Conventionally, H-shaped steel columns are often used in small and medium-sized steel-framed buildings.

[0003] The steel column of the H-shaped steel is often configured as a beam-column joint structure rigidly connected to a steel beam.

In this case, a so-called bracket-type beam-column joint structure in which a part of a steel beam (a bracket or the like) is previously joined to a steel column by welding at a factory or the like to form a beam-column joint is mainly used. Will be implemented.

[0005] However, in the column-column joint structure of the bracket type, there are two joint portions of the steel beam: a column-beam joint portion (weld joint) and a beam-beam joint portion (high-strength bolt joint or weld joint). Costs are relatively high.

Therefore, in place of the bracket type column-beam joint structure, a column-beam joint structure in which the ends of steel beams are weld-joined on site may be implemented.

However, in this case, since the welding operation is performed on site, there is a problem that the process is affected by the weather, and a high degree of control is required for the construction accuracy, welding shrinkage, and the like.

In addition, the beam-column joint structure described above is usually provided with a stiffener connecting the flange portions of the steel column in order to prevent the flange portions of the steel column from being deformed in an out-of-plane direction during an earthquake or the like. The cost associated with installing the stiffener is high. In addition, when the stiffener is welded, the mechanical properties of the base material may be altered over the entire circumference of the steel column due to the thermal effect.

In view of the above-mentioned problems of the beam-column joint structure, a beam-column joint structure in which a steel beam is joined to a steel column using a high-strength bolt without using welding as much as possible has been proposed. For example, in a beam-column joint structure disclosed in Japanese Patent Application Laid-Open No. 5-209434, an end plate is attached to an end face of a steel beam, and a female screw portion is formed in a bolt hole provided in the steel beam, thereby reducing the introduction tension. A plurality of high-strength bolts, which can be visually confirmed through a load control washer, are screwed into the female screw portion of the steel column from the end plate side of the steel beam to rigidly join the steel beam to the steel column.

On the other hand, a beam-column joint structure in which a steel beam is semi-rigidly joined to a steel column using high-strength bolts has also been proposed. For example, the beam-column joint structure disclosed in FIG. 1 of Japanese Patent No. 2750360 is an application of a so-called split tee type beam-column joint structure, and includes a split tee and a steel beam, and a split tee and a steel beam. This is a configuration in which an attenuating material is interposed between each.

[0011]

The above-mentioned prior art beam-column joint structure is a technique aimed at constructing a beam-column joint having greater rigidity. This is a highly expected configuration. That is, in the illustrated example of the publication, since a square steel pipe is used as the steel column, the beam joining portion of the steel column is thickened by the reinforcing plate, and the high-strength bolt is inserted into the female screw portion formed in the bolt hole of the steel column. The so-called one-side bolt-type joining mode of screwing is used to prevent the steel column from deforming in the out-of-plane direction.

The conventional beam-column joint structure of the prior art is
When applied to the case where an H-section steel is used for a steel column, it is necessary to add a stiffener for connecting the flange portions of the steel column, and as in the case of the column-beam joint structure of the above-described conventional technology, the cost associated with mounting this stiffener is required. In addition, when the stiffener is welded and joined, there is a possibility that the mechanical properties of the base material are deteriorated over the entire circumference of the steel column due to the thermal effect.

The above-mentioned prior art column-beam joint structure has a drawback that the split-tee type column-beam joint structure itself, which is the base, requires high precision in the manufacture of members and construction.

Although it can be evaluated that the damping material is used to absorb a certain amount of vibration energy (seismic isolation performance), it can be evaluated that the flange portion of the steel column is out of the plane when a tensile force is applied. After all, in order to prevent the deformation of the steel column, a stiffener for connecting the flange portion of the steel column must be attached, and there is the same problem as the column-beam joint structure of the related art. In this respect, it can be said that the structure of the steel column is expected to have considerable seismic resistance.

Accordingly, an object of the present invention is to semi-rigidly join a steel beam made of H-shaped steel to a steel column made of H-shaped steel with high-strength bolts and nuts so as to be elastically deformable within the deformation limit in the axial direction of the material. As a structure that does not expect much earthquake resistance in the strength of the steel column members, there is no need to provide reinforcing members such as reinforcing plates and stiffeners on the steel column, so welding welding is unnecessary, and it is used as a base material for steel columns and steel beams. Deterioration of mechanical properties can be avoided, material production and construction management can be easily performed, simple construction can be implemented economically, and there is no damage during an earthquake, reducing the response of buildings An object of the present invention is to provide a beam-column joint structure that can be used.

[0016]

Means for Solving the Problems As means for solving the above-mentioned problems, a semi-rigidly joined beam-column joint structure according to the first aspect of the present invention is an end plate comprising an H-shaped steel column and a steel beam. And a beam-column joint structure formed by semi-rigid joining with high-strength bolts and nuts, wherein an end plate is attached to an end face of the steel beam, and an end plate of the steel beam and a flange portion of the steel beam column, It is characterized by being joined by a plurality of high-strength bolts with an elastic washer member interposed between them and between at least one of them and the bolt head or nut.

According to a second aspect of the present invention, there is provided the semi-rigidly joined column-beam joint structure according to the first aspect, wherein the elastic washer member has rubber or plate having an elastic rigidity smaller than the out-of-plane bending rigidity of the flange portion of the steel column. It is characterized by being constituted by a spring or the like.

According to a third aspect of the present invention, in the semi-rigid beam-column joint structure according to the first or second aspect, the high-strength bolt for joining the end plate of the steel beam and the flange portion of the steel beam column is a steel beam. The elastic washer member is fixed by a nut tightened with a tightening force within a range of an elastic region within the deformation limit in the material axis direction.

According to a fourth aspect of the present invention, there is provided a semi-rigidly joined column-beam joint structure according to any one of the first to third aspects,
Under the beam joint of the flange portion of the steel column, a shear receiving hardware for mounting and supporting the end plate of the steel beam is attached by a high-strength bolt.

According to a fifth aspect of the present invention, there is provided a semi-rigidly joined beam-column joint structure according to any one of the first to fourth aspects,
The floor slab concrete cast on the steel beam is characterized by being insulated from the steel column and the end of the steel beam joined to the steel column.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The beam-column joint structure according to the first to fifth aspects of the present invention is a semi-rigid joint between an H-shaped steel column and a steel beam using an end plate, high-strength bolts and nuts. It is suitably implemented as a column-beam joint structure.

1 to 6 show various embodiments of a beam-column joint structure according to the present invention.

First, the beam-column joint structure shown in FIGS. 1A and 1B is as follows.
An end plate 2 having a size for connecting upper and lower flanges 1a, 1a of the steel beam 1 is integrally attached to an end face of the steel beam 1 made of H-section steel by means of welding or the like in advance at a factory or the like. The end plate 2 of the steel beam 1 and the flange 3a of the steel column 3 also made of H-section steel have an elastic washer member 5A in the gap between them, and the inner surface of the flange 3a of the steel column 3 and the bolt head. And a semi-rigid joint formed by a plurality of high-strength bolts 4 with an elastic washer member 5B interposed therebetween (the invention according to claim 1).

Although not shown, the direction in which the high-strength bolt 4 is passed is reversed, and the nut 6 is connected to the elastic washer member 5B.
It may be carried out so as to be on the side, or may be carried out by tightening and fixing nuts from both sides using a high-strength bolt without a bolt head. This is the same for the following embodiments.

The above-mentioned elastic washer members 5A and 5B are made of rubber, a disc spring or the like having an elastic rigidity smaller than the out-of-plane bending rigidity of the flange 3a of the steel column 3 (the second aspect of the present invention).

The elastic washer members 5A, 5A and 5A shown in FIG.
B is an independent configuration for each high-strength bolt 4, but is not limited to such a configuration. Although illustration is omitted, for example, the elastic washer members 5A and 5B are configured and implemented by a rubber plate or the like which is easy to manufacture and have a size and a shape that can be commonly used for a plurality of adjacent high-strength bolts 4. You may.

Each high-strength bolt 4 for joining the end plate 2 of the steel beam 1 and the flange 3a of the steel column 3 has elastic washer members 5A and 5A within the deformation limit of the steel beam 1 in the direction of the material axis.
Nut 6 tightened with a tightening force in the range where B is in the elastic range
To secure the effect of the semi-rigid joint (the invention according to claim 3).

That is, when a member having a relatively wide elastic range such as rubber is used as the elastic washer members 5A and 5B,
Only the balance of the tightening force of each high-strength bolt 4 needs to be considered, but when a steel disc spring or the like is used, sufficient consideration should be given to elasticity even when it is elastically deformed during an earthquake. It is necessary to determine the tightening force of the force bolts 4.

In the case of the present invention, at the stage of joining the steel column 3 and the steel beam 1, the elastic washer members 5A and 5B are connected to the length of the steel beam 1, the end plate 2 of the steel beam 1 and the flange 3a of the steel column 3. Since errors such as the positions of the bolt holes are absorbed to some extent, as a result, the production of the members and the management of the construction can be easily performed.

In the embodiment of FIG. 1 constructed as described above, a large horizontal force acts on the building during an earthquake and a large compressive force acts on the joint between the steel column 3 and the steel beam 1. In the portion where the elastic washer member 5A in the gap between the end plate 2 and the flange 3a of the steel column 3 elastically deforms and a large tensile force is applied, the inner surface of the flange 3a of the steel column 3 and the bolt head Elastic washer member 5 between 3a
Since B deforms elastically and absorbs each deformation, the joint between the steel column 3 and the steel beam 1 is not damaged, and the seismic response of the building can be reduced.

2A and 2B, the upper and lower flanges 1a, 1a of the steel beam 1 are attached to the end face of the steel beam 1.
An end plate 2 having a size protruding above and below a is attached. A plurality of the high-strength bolts 4 are arranged at upper and lower (upper and lower) positions of the upper and lower flanges 1 a and 1 a of the steel beam 1, and a gap between the end plate 2 of the steel beam 1 and the flange 3 a of the steel column 3. And a structure in which elastic washer members 5A and 5B are interposed between the inner surface of the end plate 2 of the steel beam 1 and the bolt head 4a, respectively (the invention according to claim 1).

In the beam-column joint structure shown in FIGS. 2A and 2B, the arrangement of the elastic washer members 5A and 5B is different from that of the beam-joint structure shown in FIG. Although the relationship is exactly symmetrical with respect to the joint portion, the operational effects are the same.

The beam-column joint structure shown in FIGS. 3A and 3B is based on the configuration of the beam-joint structure shown in FIGS. 1A and 1B.
Below the beam joint of the flange 3a of the steel column 3, a steel beam 1
The invention is characterized in that a shear receiving metal member 7 for mounting and supporting the end plate 2 is mounted by high-strength bolts 8.

The above-mentioned shear receiving metal member 7 secures each high-strength bolt 8 firmly to the flange 3a of the steel column 3 with the nut 10 and fixes the steel frame 1 from the lower end surface of the end plate 2 of the steel beam 1 on its upper surface. The shear force of the beam 1 is additionally supported. In addition, since the upper surface is formed in a horizontal plane, the elastic washer member 5 on the lower end surface of the end plate 2 is provided.
Even if A and 5B undergo elastic deformation and the steel beam 1 slides and displaces in the axial direction of the material, the displacement operation is not hindered.

Further, as described above, the shear receiving metal member 7 assists the shear force between the flange 3a of the steel column 3 and the end plate 2 of the steel beam 1 as described above. The number of the high-strength bolts 4 to be attached can be reduced from the viewpoint of the design surface, and the safety of the joint between the steel column 3 and the steel beam 1 can be further ensured.

The column-beam joint structure shown in FIGS.
Assuming the configuration of the beam-to-column joint structure shown in FIGS. 1A and 1B, the shear receiving metal member 7 for supporting the end plate 2 of the steel beam 1 on the lower side of the beam joint portion of the flange 3a of the steel column 3 with high strength. It is attached by bolts 8 and has the same operational effects as the embodiment of FIG.

In each of the above-described embodiments, the rigidity of the joint between the steel column 3 and the steel beam 1 is basically adjusted by the number of high-strength bolts 4 that join the steel beam 1 to the steel column 3 and the arrangement thereof. You.

Based on this, the beam-to-column joint structure shown in FIG. 5 is similar to the beam-to-column joint structure shown in FIG. An end plate 2 having a size protruding up and down is attached, and high-strength bolts 4 arranged in a well-balanced manner not only at the upper and lower (outer) positions of the flanges 1a and 1a of the steel beam 1 but also at the inner positions thereof are attached. Therefore, it is configured to have large rigidity.

The column-to-beam joint structure shown in FIG. 6 shows an embodiment in which more high-strength bolts 4 are attached, and has a configuration having greater rigidity.

FIG. 7 shows the relationship between the amount of interlayer deformation of the building and the rigidity of the beam-column joint, and the relationship between the horizontal shear force of the building and the rigidity of the beam-column joint in a simplified manner. . Since the amount of interlayer deformation of the building substantially matches the amount of deformation of the steel beam 2 at the beam-column joint in the axial direction of the beam, the above-described deformation limit of the steel beam 2 substantially matches the interlayer deformation limit of the building. Further, since the interlayer deformation amount and the horizontal shear force are in inverse proportion, the rigidity of the joint between the steel column 3 and the steel beam 1 described above may be determined at the design stage based on this relationship (see FIG. 7). See design range).

FIG. 8 shows an example of a state in which a floor slab concrete 9 is cast on the steel beam 1 in the column-beam joint structure shown in FIGS. 1A and 1B.

The cast floor slab concrete 9 is insulated from the steel column 3 and the end of the steel beam 1 joined to the steel column 3 (the invention according to claim 5). .
With such a configuration, the elastic washer members 5A and 5B of each high-strength bolt 4 can more effectively exert elastic deformation during an earthquake. Needless to say, not only the column-beam joint structure shown in FIG. 1 but also a case where the present invention is applied to the other embodiments described above is similarly effective.

[0043]

According to the first to fifth aspects of the present invention, the semi-rigid beam-column joint structure is capable of elastically deforming a steel column and a steel beam made of H-shaped steel within the deformation limit in the axial direction of the material. Semi-rigid connection with high-strength bolts and nuts as much as possible, so that the structural strength of the steel column does not expect much earthquake resistance. Therefore, since it is not necessary to provide a reinforcing member such as a reinforcing plate or a stiffener for the steel column, welding is not required, and the mechanical properties of the steel column and the steel beam as a base material can be prevented from being deteriorated.

In addition, the elastic washer member absorbs errors of these constituent members to some extent at the stage of joining the steel column and the steel beam, and as a result, it is possible to easily manage the member production and construction.

Therefore, it can be implemented economically with simple construction.

In addition to these advantages, it is possible to realize a structure capable of reducing the response of a building without being damaged during an earthquake.

[Brief description of the drawings]

FIG. 1A is a front view showing a first embodiment of a beam-column joint structure according to the present invention, and FIG. 1B is a cross-sectional view taken along line aa of FIG.

FIG. 2A is a front view showing a column-beam joint structure according to a second embodiment of the present invention, and FIG. 2B is a cross-sectional view taken along line bb of FIG.

FIG. 3A is a front view showing a third embodiment of a beam-column joint structure according to the present invention, and FIG. 3B is a cross-sectional view taken along line cc of FIG.

FIG. 4A is a front view showing a fourth embodiment of a beam-column joint structure according to the present invention, and FIG. 4B is a cross-sectional view taken along line dd of FIG.

FIG. 5 is a sectional view showing a fifth embodiment of the beam-column joint structure according to the present invention.

FIG. 6 is a cross-sectional view showing a sixth embodiment of the beam-column joint structure according to the present invention.

FIG. 7 is a graph showing the relationship between the interlayer deformation amount of a building and the rigidity of a beam-column joint, and the relationship between the horizontal shear force of the building and the rigidity of a beam-column joint.

FIG. 8 is a transverse sectional view showing a state in which floor slab concrete is cast on a steel beam in the embodiment of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 steel beam 2 end plate 3 steel column 3a flange portion of steel column 4 high strength bolt 4a bolt head 5A, 5B elastic washer member 6 nut 7 shearing hardware 8 high strength bolt 9 floor slab concrete

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuru Higuchi 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside Takenaka Corporation Technical Research Institute (72) Michikazu Kobayashi 1-5-5 Otsuka, Inzai City, Chiba Prefecture 1 Within Takenaka Corporation Technical Research Institute (72) Inventor Yoshinobu Ono 1-5-1, Otsuka, Inzai-shi, Chiba Prefecture 1 Within Takenaka Corporation Technical Research Center F-term (reference) 2E125 AA04 AA14 AB01 AC15 AG03 AG04 AG12 BE10 CA06 CA09 EB06

Claims (5)

[Claims] 1. A beam-column joint structure comprising a steel column made of H-shaped steel and a steel beam semi-rigidly joined by an end plate and high-strength bolts and nuts, wherein the end plate is attached to an end face of the steel beam. The end plate of the steel beam and the flange portion of the steel column are joined by a plurality of high-strength bolts having an elastic washer member interposed therebetween, and between at least one of them and the bolt head or nut. A semi-rigid beam-column joint structure characterized by being made. 2. The semi-rigid joint according to claim 1, wherein the elastic washer member is made of rubber or a disc spring having a lower elastic rigidity than the out-of-plane bending rigidity of the flange portion of the steel column. Column-beam joint structure. 3. A high-strength bolt for joining an end plate of a steel beam and a flange portion of a steel column with a tightening force in a range where the elastic washer member is in an elastic range within a deformation limit of the steel beam in the direction of the material axis. The semi-rigid beam-column joint structure according to claim 1 or 2, wherein the beam-column joint structure is fixed by a tightened nut. 4. A shear receiving hardware for mounting and supporting an end plate of a steel beam on a lower side of a beam joint portion of a flange portion of the steel frame by a high-strength bolt. 4. The semi-rigid column-to-column joint structure according to any one of Items 3 to 3. 5. The floor slab concrete cast on a steel beam is characterized by being insulated between a steel column and an end of a steel beam joined to the steel column. The semi-rigid column-beam joint structure according to any one of claims 1 to 4.