JP2001329614A - Beam-column joint metal and beam-column joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a beam-column joint metal, by which the dimensional accuracy of a beam-column joint section can be ensured easily by simple constitution, alignment is facilitated, the complicated cutting works of a beam are made unnecessary and welding works are reduced and force can be transmitted efficiently among columns on upper and lower floors and which has excellent aseismicity and can construct a beam-column joint structure having the contraction of a column area having high reliability at a low cost. SOLUTION: The lower end section of the beam-column joint metal 4, in which a reinforcing section 4b is formed at the upper end section of a square-shaped sectional pipe 4a, is welded and joined to the lower-floor column 1, an upper-floor column 2 is welded and joined at the upper end section of the joint metal 4, and the end sections of the beams 3 are welded and joined onto the outer-circumferential side face 4f of the joint metal 4. The joint metal 4 is constituted in such a manner that thickness TA corresponding to the position A of the outer-circumferential side face of the upper floor column 2 of the reinforcing section 4b has thickness at the fixed times of the plate thickness (t) of the upper floor column 2 and the underside 4e of the reinforcing section 4b or the tangent of the underside 4e has a tilt angle from 40 deg. to 50 deg. in the axial direction of the column and the underside 4e is thinned gradually towards the inside of the pipe 4a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam-to-column joint for joining a column of a steel pipe having a square cross section of a steel building structure to a steel beam such as an H-beam, and a beam-to-column joint structure using the same. .

[0002]

2. Description of the Related Art Conventionally, in order to efficiently transmit a force between columns on the upper and lower floors at a beam-column joint of a so-called column constrictor having different outer dimensions of columns on the upper and lower floors, as shown in FIG. In general, a tapered tube 51 is used in which the cross section of the joining portion gradually decreases upward.

In FIG. 5 (a), a tapered tube 51 is formed by bending two plates and processing them into a U-shape and combining them or welding by combining and combining four flat plates. Diaphragms 52 are appropriately welded to the upper and lower surfaces and the middle part, and upper and lower columns 53 of a rectangular cross-section pipe are welded to upper and lower diaphragms 52, and beams 54 made of H-section steel are welded to the side surfaces of the tapered pipe 51. You.

[0004]

However, in the above-mentioned conventional example, since the panel surface of the tapered tube 51 is inclined with respect to the axial direction of the column 53, it is difficult to secure the dimensional accuracy of the column-beam joint. , It took time to align.

[0005] Further, there is a possibility that the welded portion between the column 53 and the diaphragm 52 and the welded portion between the diaphragm 52 and the beam 54 may interfere with each other.
It is necessary to increase the amount of projection of the diaphragm 52 projecting from the panel surface of the 51. Therefore, as shown in FIG. 5 (b), the shape of the end of the beam 54 becomes complicated, and it is necessary to cut out the H-section steel including a plurality of cutting steps, and the welding operation is difficult, and the welding step is difficult. It requires more advanced welding skills and takes more time and costs. There was also a problem that the quality of the beam-column joint varies.

[0006] In the configuration using the diaphragm 52,
Since the number of welding steps is large and time-consuming, the joining operation takes time, the construction period is prolonged, the cost is high, and the quality of the joint may vary. This tendency becomes remarkable when the position where the flange 54a of the beam 54 is attached is different as shown in FIG. 5A because the number of the diaphragms 52 increases.

[0007] The present invention is to solve the above-mentioned problems,
Its purpose is to easily secure the dimensional accuracy of the beam-column joint with a simple configuration, easy alignment, no complicated cutting of the beam, less welding, and lower and upper floors. It is an object of the present invention to provide a beam-to-column joint hardware capable of efficiently transmitting force between columns, having excellent seismic resistance, and being able to construct a low-cost and highly reliable column-column joint structure for column drawing.

[0008]

A beam-to-column joint according to the present invention for achieving the above object is a beam-to-column joint for joining a column and a beam of a building, the upper floor being composed of a tube having a rectangular cross section. At the upper end of the rectangular section tube on the side to which the end of the column is connected, the upper surface is orthogonal to the axial direction of the column, and the thickness corresponding to the outer peripheral side position of the upper column is the plate thickness of the upper column. of

(Equation 3) And a reinforcing portion formed such that the lower surface or a tangent to the lower surface has an inclination angle of 40 degrees or more and 50 degrees or less with respect to the axial direction of the column, and gradually becomes thinner toward the inside of the rectangular cross-section tube. It is characterized by having.

According to the above structure, the lower end of the upper story column is welded to the upper surface of the reinforcing portion provided at the upper end of the rectangular cross section pipe, so that the outer dimensions of the upper and lower story columns are different from each other. The beam-column joint can be easily formed.

Further, the thickness corresponding to the outer peripheral side surface position of the upper story pillar of the reinforcing portion is the thickness of the upper story pillar.

(Equation 4) By so doing, it is possible to reliably transmit the force from the upper story column, which acts as a shear force to the reinforcing portion, particularly to the lower story column.

Further, the lower surface of the reinforcing portion or the tangent to the lower surface has an inclination angle of not less than 40 degrees and not more than 50 degrees with respect to the axial direction of the column, and gradually becomes thinner toward the inside of the rectangular section tube. The reinforcing portion is formed with a thickness corresponding to the distribution of the force acting on the reinforcing portion from the upper floor column, and the stress generated in the reinforcing portion is made substantially uniform to locally form the reinforcing portion. A large yield can be effectively prevented.

Further, the force from the upper story column can be efficiently transmitted to the lower story column in the load-bearing area after the yield moment of the upper story column, and the volume of the reinforcing portion is suppressed to reduce the weight and reduce the weight. Cost can be reduced.

Another structure of the beam-to-column joint according to the present invention is a beam-to-column joint for joining a column and a beam of a building, wherein an end of an upper column having a rectangular cross section is connected. At the upper end of the rectangular cross-section tube on the side of which the upper surface is orthogonal to the axial direction of the column, the thickness corresponding to the inner peripheral side position of the upper floor column is the plate thickness of the upper floor column.

(Equation 5) And a reinforcing portion formed such that the lower surface or a tangent to the lower surface has an inclination angle of 40 degrees or more and 50 degrees or less with respect to the axial direction of the column, and gradually becomes thinner toward the inside of the rectangular cross-section tube. It is characterized by having.

According to the above configuration, the thickness corresponding to the inner peripheral side surface position of the upper story column of the reinforcing portion is equal to the thickness of the upper story column.

(Equation 6) By doing so, it is advantageous in terms of proof stress and rigidity even when the column axial force is particularly large, and the force from the upper story column acting as a shearing force on the reinforcing portion can be more reliably transmitted to the lower story column.

It is preferable that the reinforcing portion and the rectangular cross-section tube are integrally formed by casting.

Further, the beam-and-column joint has the above-mentioned beam-and-column joint, a column having a rectangular section is welded to an end of the beam-and-column joint, and a steel beam is welded to an outer peripheral side portion of the beam-and-column joint. According to the beam-to-column joint structure, the dimensional accuracy of the beam-to-column joint can be easily ensured with a simple configuration, alignment is easy, complicated cutting of the beam is unnecessary, welding is reduced, and The force can be transmitted efficiently between the columns on the floor, and it is possible to construct a low-cost and highly reliable column-column joint structure with excellent seismic resistance and low cost.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a beam-to-column joint according to the present invention and a beam-to-column joint structure using the same. FIG. 1A is an explanatory plan view showing a configuration in a case where the beam-column joint structure according to the present invention is applied to a column drawing of a corner column,
FIG. 1B is a cross-sectional explanatory view showing a configuration in a case where the beam-column joint structure according to the present invention is applied to a column-shaped column drawing, and FIG. 2A shows an example of a configuration of a reinforcing portion of a beam-column joint. FIG. 2B is a partial cross-sectional view illustrating a shape of a beam end portion, and FIG.
(A) is an explanatory plan view showing a configuration in a case where the beam-to-column joint structure according to the present invention is applied to a central column column drawing, and FIG. FIG. 4 (a) is a plan explanatory view showing a configuration when the column-beam joint structure according to the present invention is applied to a column constriction of a side column, and FIG. It is sectional explanatory drawing which shows the structure at the time of applying the beam-column joint structure which concerns on this invention to the column constriction of a side column.

In FIG. 1 to FIG. 4, a beam-to-column joint 4 for joining a lower story column 1 and an upper story column 2 formed of a steel pipe having a rectangular cross section of a steel building structure and a beam 3 formed of an H-section steel by welding is provided. ,
It has an outer diameter that is substantially the same as the outer diameter of the lower story column 1, and is configured to have a thickness greater than the plate thickness of the lower story column 1.

The lower story column 1 and the upper story column 2 may be square cross-section tubes, and may be roll-formed columns, press-formed columns, or assembled welding columns. Further, a concrete-filled steel pipe column having a hollow interior filled with concrete to improve the strength and the fire resistance may be used. Further, the beam 3 is an H-shaped steel, and may be a roll-formed beam, a press-formed beam, or an assembled welded beam. The end of the beam 3 is, as shown in FIG.
It is configured in a simple shape by cutting in a single step.

FIG. 1 (b) and FIG.
As shown in (a), the rectangular cross-section tube 4a and the reinforcing portion 4b provided at the upper end of the rectangular cross-section tube 4a are integrally formed by casting cast steel or ductile cast iron, and the beam 3 The outer peripheral side surface 4f in the range where the is attached is formed flat. In addition, the beam-and-column joint 4 may be manufactured by using a cross-section thickening method by high-frequency heating in addition to casting.

The upper surface 4c of the reinforcing portion 4b is orthogonal to the axial direction of the column (the axial direction of the beam-to-column joint 4) and has a rectangular cross-section tube 4a.
Is formed substantially flush with the upper end surface 4d of the second member. Then, the lower surface 4e of the reinforcing portion 4b (see FIG. 1B) or the lower surface 4e
The tangent line (see FIG. 2A) at the outer peripheral surface position of the upper and lower columns 2 has an inclination angle θ of not less than 40 degrees and not more than 50 degrees with respect to the axial direction of the column (the axial direction of the beam-to-column joint 4). It is formed so as to gradually become thinner toward the inside of the rectangular section tube 4a.

The lower surface 4e of the reinforcing portion 4b shown in FIGS. 1 (b), 3 (b) and 4 (b) is formed by a tapered surface composed of an inclined plane, and the reinforcing portion 4b shown in FIG. 2 (a). Lower surface 4 of
e shows an example constituted by an arc surface having a predetermined curvature. In the present embodiment, these lower surfaces 4e or lower surfaces 4e
An example in which the inclination angle θ of the tangent at the position of the outer peripheral surface of the upper floor column 2 is set to 45 degrees is shown.

In FIG. 2A, the relationship between the thickness T _A of the reinforcing portion 4b corresponding to the outer peripheral side position A of the upper story column 2 having a rectangular cross-section tube and the plate thickness t of the upper story column 2 is as follows. Is set as shown in the equation.

[0024]

(Equation 7)

[0025] In this embodiment, as an example, the thickness T _A and Uekaihashira 2 of plate thickness t of the reinforcing portion 4b corresponding to an outer peripheral side position A Uekaihashira 2 becomes equation relationship below It is set as follows.

[0026]

(Equation 8)

The lower end of the lower beam 1 is welded to the lower end of the beam-joint 4, and the lower end of the upper column 2 is welded to the upper end of the beam-joint 4. As shown in FIG. 1 (b), a groove is provided at an end of a lower story column 1 and an upper story column 2 each having a rectangular cross-section tube, and a backing metal 5 is attached to the lower story column 1 and the upper story column. 2 and the lower beam 1 and the upper beam 2 are welded to each other.

Also, the flange 3a of the beam 3 made of H-section steel
The backing metal 5 is arranged on the surface of the flange 3a of the beam 3 on the side of the web 3b to form a beam on the flat outer peripheral side face 4f of the beam-to-column joint 4. 3 are joined by non-scallop welding.

If the beam-to-column joint 4 is used, FIG.
As shown in (b), the flange 3 of the beam 3 joined to the column
Even if there is a step in a, it is possible to cope without adding a reinforcing material such as the diaphragm 52 as in the conventional example shown in FIG. 5A and described above, thereby reducing the number of parts and the number of welding steps. Quality performance can be stabilized. Further, since the beam 3 may be welded to any position of the beam-to-column joint 4, the beam composition (vertical dimension) of the beam 3 may be changed, and the mounting position of the beam 3 in the vertical and horizontal directions and the beam 3 may be changed. It is easy to change the mounting direction.

A reinforcing portion 4 is provided at the upper end of the beam-to-column joint 4.
By forming b, it is possible to easily construct a so-called pillar-column joint structure in which the outer dimension of the upper story column 2 is smaller than the outer dimension of the lower story column 1.

When the beam-and-column joint 4 is formed by casting, the radius of curvature of the outer peripheral surface of the corner portion can be reduced to about 5 mm or less, so that FIGS. 1 (a) and 4 (a) show. As described above, even when the outer peripheral surface 4f (the outer peripheral surface of the lower story column 1 and the upper story column 2) of the beam-to-column joint 4 and the side surface 3a1 of the flange 3a of the beam 3 are aligned on the same plane, the column Outer side surface 4f of beam joint hardware 4 and side surface of flange 3a of beam 3
There is almost no gap with 3a1. Therefore, a plate material or the like for filling the gap between the outer peripheral side surface 4f of the beam-to-column joint 4 and the side surface 3a1 of the flange 3a of the beam 3 is unnecessary, and the manufacturing cost can be reduced and the construction period can be shortened.

Therefore, even if the column and the beam 3 are eccentric as shown in FIGS. 1A and 4A, the column and the beam 3 are eccentric as shown in FIG. Even in the case where the joint is not used, it is possible to construct a column-beam joint structure for joining the column and the beam 3 of the building using the common column-joint metal fitting 4.

Further, in a steel building structure, FIG.
As shown in FIG. 3 (a), the beam 3 is joined in two orthogonal directions, and the pillar and the beam 3 are eccentric in two directions. As shown in FIG. 4 (a), which are joined in the same direction and the column and the beam 3 are not eccentric.
Are joined in the opposite direction by 180 degrees, and the direction of the eccentricity may differ from the viewpoint of effective use of the indoor space depending on the installation position of the column, such as a side column in which the column and the beam 3 are eccentric in one direction. Regardless of which column is used, a column in which the outer dimensions of the upper story column 2 are smaller than the external dimensions of the lower story column 1 by utilizing the common column-beam joint hardware 4 by devising the arrangement of the reinforcing portion 4b. The beam-column joint structure of the diaphragm can be easily constructed.

Further, even when a plurality of beams 3 having different beam configurations (dimensions in the vertical direction of the beam 3) are joined, the number of types of the beam-to-column joint hardware 4 can be reduced by using a common column-beam joint hardware 4. As a result, mass production can be performed, and manufacturing costs and parts management costs can be reduced.

Further, by the thickness T _A and Uekaihashira 2 of plate thickness t of the reinforcing portion 4b corresponding to the outer peripheral side position A of Uekaihashira 2 was set to be the relationship of the above formula, reinforcing Part 4b
Can be prevented from shearing and yielding earlier than the upper story column 2, and the force from the upper story column 2 can be reliably transmitted to the lower story column 1.

Further, if you set the relationship between the thickness T _A and Uekaihashira 2 of plate thickness t of the reinforcing portion 4b corresponding to the outer peripheral side position A of Uekaihashira 2 so that the formula of the relationship of the following Although the strength of the reinforcing portion 4b is improved, the material cost is increased, which is uneconomical, and the weight of the beam-to-column joint 4 is increased, which is disadvantageous.

[0037]

(Equation 9)

The lower surface 4e or the lower surface 4 of the reinforcing portion 4b
When the inclination angle θ between the tangent of e and the axial direction of the column is 40 degrees or more and 50 degrees or less, it is formed so as to become gradually thinner toward the inside of the rectangular cross-section tube 4a, thereby reinforcing the upper story column 2. Reinforcing part 4b with a thickness corresponding to the distribution of force acting on part 4b
Is formed, and the stress generated in the reinforcing portion 4b is made substantially uniform, so that local yielding of the reinforcing portion 4b can be effectively prevented.

If the inclination angle θ between the lower surface 4e of the reinforcing portion 4b or the tangent to the lower surface 4e and the axial direction of the column is smaller than 40 degrees, the thickness of the outer surface of the reinforcing portion 4b becomes excessively large, which is uneconomical. If the inclination angle θ is larger than 50 degrees, local yielding is likely to occur on the outer surface side of the reinforcing portion 4b, and the force from the upper story column 2 can be reliably transmitted to the lower story column 1. There is a risk of disappearing.

As shown in FIG. 2A, when the lower surface 4e of the reinforcing portion 4b is formed of an arc surface having a predetermined curvature, manufacturing by casting or the like can be facilitated.

In a steel building structure, the beam-to-column joint 4 may be used for all the joints between the columns and the beams 3, or the column-to-beam joints 4 may be used for the joints between some of the columns and the beams 3. It may be configured by using. In addition, cement or the like can be filled into the inside of a column having a rectangular cross-section tube to form a concrete-filled steel tube column, so that high strength and fire resistance can be improved.

The connection between the beam-to-column joint 4 and the beam 3 is performed by a joining method other than welding by providing an end plate at the end of the beam 3 and connecting the end plate and the beam-to-column joint 4 with a high-strength bolt. You may join.

[0043] Further, as another configuration, the thickness T _B corresponding to the inner peripheral side position B on Kaibashira second reinforcing portions 4b shown in FIG. 2 (a), and the plate thickness t of the upper Kaibashira 2 Is set so as to satisfy the following equation, it is advantageous in terms of proof stress and rigidity even when the column axial force is particularly large, and the force from the upper story column 2 acting as a shearing force on the reinforcing portion 4b is reduced. It can transmit to the lower story pillar 1 more reliably.

[0044]

(Equation 10)

[0045]

Since the present invention has the above-described structure and operation, the dimensional accuracy of the beam-column joint can be easily secured with a simple structure, the alignment is easy, and the beam is complicated. Beam-to-column joints that require no cutting and require little welding, can transmit force efficiently between columns on the upper and lower floors, have excellent seismic resistance, and can construct a low-cost and highly reliable column-column joint for column drawing. Can be provided.

That is, since the shape of the beam-to-column joint is simple, dimensional accuracy can be easily secured, and the beam-to-column joint can be easily manufactured in a short time. In addition, since the number of welding steps is small and high welding skill is not required, it is possible to suppress variation in quality.

Further, by devising the arrangement of the reinforcing portions, it is possible to cope with the common column-beam joint hardware regardless of the direction of the eccentricity of the column and the beam. It can be sold in stock and has a short delivery time. Since the shape is simple at the time of manufacturing by casting, defects are hardly generated, and the variation in strength of the beam-to-column joint is small.

[Brief description of the drawings]

FIG. 1A is a plan explanatory view showing a configuration in a case where a beam-to-column joint structure according to the present invention is applied to a column drawing of a corner column, and FIG. It is sectional explanatory drawing which shows the structure at the time of applying to a column constriction.

2A is a partial cross-sectional view illustrating an example of a configuration of a reinforcing portion of a beam-to-column joint, and FIG. 2B is a cross-sectional explanatory view illustrating a shape of a beam end.

FIG. 3A is a plan explanatory view showing a configuration in a case where a beam-column joint structure according to the present invention is applied to a center column pillar drawing, and FIG. 3B is a plan view illustrating a beam-column joint structure according to the present invention; It is sectional explanatory drawing which shows the structure at the time of applying to a column constriction.

FIG. 4A is a plan explanatory view showing a configuration in a case where the beam-column joint structure according to the present invention is applied to a column constriction of a side column, and FIG. It is sectional explanatory drawing which shows the structure at the time of applying to a column constriction.

FIG. 5 is a diagram illustrating a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lower story pillar 2 ... Upper story pillar 3 ... Beam 3a ... Flange 3a1 ... Side surface 3b ... Web 4 ... Beam-to-beam joint fitting 4a ... Square cross section tube 4b ... Reinforcement part 4c ... Upper surface 4d ... Upper surface 4e ... Lower surface 4f ... Outer periphery Side 5: Backing metal

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Riki Iiboshi 1-2-1 Yurakucho, Chiyoda-ku, Tokyo Asahi Kasei Kogyo Co., Ltd. F-term (reference) 2E125 AA04 AA14 AB16 AC15 AC16 AG23 AG34 BB09 BB31 BB34 BD01 CA90 EA33

Claims (4)

[Claims] 1. A beam-to-column joint for joining a column and a beam of a building, wherein the upper end of the square section tube on the side to which the end of the upper story column having the square section tube is connected has a top surface formed of a column. And the thickness corresponding to the outer peripheral side position of the upper story is the thickness of the upper story. And a reinforcing portion formed such that the lower surface or a tangent to the lower surface has an inclination angle of 40 degrees or more and 50 degrees or less with respect to the axial direction of the column, and gradually becomes thinner toward the inside of the rectangular cross-section tube. A beam-to-column joint hardware having: 2. A beam-to-column joint for connecting a column and a beam of a building, wherein the upper end of the rectangular cross-section tube on the side to which the end of the upper story column having the rectangular cross-section tube is connected has a top surface formed of a column. And the thickness corresponding to the inner peripheral side surface position of the upper story column is the thickness of the upper story column. And a reinforcing portion formed such that the lower surface or a tangent to the lower surface has an inclination angle of 40 degrees or more and 50 degrees or less with respect to the axial direction of the column, and gradually becomes thinner toward the inside of the rectangular cross-section tube. A beam-to-column joint hardware having: 3. The beam-to-column joint according to claim 1, wherein the reinforcing portion and the rectangular cross-section tube are integrally formed by casting. 4. A beam-to-column joint having the beam-to-column joint according to any one of claims 1 to 3, wherein a column having a rectangular cross section is welded to an end of the beam-to-column joint. A beam-to-column connection structure in which a steel beam is welded to an outer peripheral side surface of the beam.