JP2003147863A - Jointing method and jointing construction for steel brace or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jointing method and a jointing construction for steel brace or the like which can be easily applied to existing buildings by means of economical design. SOLUTION: This is a jointing method capable of transmitting a shearing force and a tensile force by jointing an axial tension member such as a steel brace and an opponent member such as a column by jointing them with a long bolt with a certain angle other than the right angle between them. A gusset plate is jointed to an end portion of the axial tension member, and the gusset plate is jointed to a member at the opponent side with a plurality of long bolts used in a horizontal direction. The position of the resultant of the plurality of long bolts and an extended line from a center line of the axial tension member are intersected each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical field of a joining method and a joining structure in which, for example, a pillar or a beam member and a reinforcing brace member are joined by bolts without using fire.

[0002]

2. Description of the Related Art Conventionally, it is necessary to bolt a pillar or beam member and a reinforcing brace member to each other by using a bolt without using fire. For example, as shown in FIG. Seismic strengthening work to reinforce the strength of 2 with the reinforcement braces 3 attached later, or vertical and horizontal frame steel frames 4 and 5 assembled inside the beam structures 1 and 2 as shown in FIG. 8 with steel braces 6 and stays 7. It is found in seismic retrofitting work that reinforces strength and rigidity. Seismic retrofitting of new buildings is often carried out as well.

Reinforcement of strength by conventional general braces is
In the case of steel-framed buildings, in-situ welding is the mainstream from the viewpoint of workability, and there are no practical examples such as a crimping method that does not use fire.

However, in recent years, as a demand of building owners, the so-called "work while staying", in which the interior of the building is used for normal work, has become popular as seismic retrofitting work for existing buildings. In this case, if the on-site welding is carried out, there is a concern about a fire caused by sparks at the time of welding and a concern about a malfunction of an OA device, especially a computer due to noise or sparks at the time of welding. Therefore, on-site welding is not often used in office buildings, factories and warehouses.

Therefore, in the above technical field, there is an urgent need to establish a technique for joining members by bolts without using fire. Conventionally, in the technical field, regarding the technology of joining members together by bolts without using fire,
For example, the invention of the joining method described in JP-A-11-36448 is known. This is a technique for attaching a steel frame brace with a frame for seismic strengthening to the hollow steel material that constitutes the frame of a building. Temporarily attach the steel brace applied to the hollow member by inserting a long bolt into the hollow member and tightening it. Furthermore, the content is that the hollow member is filled with non-shrink mortar, and after the mortar is hardened, the long bolt is finally tightened.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the case of the joining method described in Japanese Patent No. 448, when this is applied to the seismic retrofitting work of an existing building, as is apparent from FIG. 1 or FIG. If it is a pillar or a beam (see paragraph [0
The description that the hollow steel material is a pillar or a beam is recognized in the third line of [010]. ), The long bolt is configured to penetrate horizontally in and out of the building. Therefore, when there are walls or other members behind the pillars or beams of the existing building, it is almost impossible to penetrate and fasten the long bolts, and there is a problem that implementation is difficult.

Next, it is essential that the joint between the brace and the pillar or beam used for the seismic reinforcement of a building or the like can transmit shearing force and tensile force or compressive force. Therefore, the transmission efficiency of the shearing force and the tensile force will be described with reference to FIG.

In the example of FIG. 9, the above-mentioned JP-A-11-36448 is used.
Unlike the joining method described in the publication, the brace member 3 is arranged in the frame of the column beam structure so that the seismic reinforcement work of the existing building will not be hindered, and the long bolt 10 is And a structure is adopted in which it is joined by penetrating in the horizontal direction parallel to the frame surface.

The problems of the joint structure of FIG. 9 can be explained as follows. In the joint structure of FIG. 9, the steel frame column 1 and the brace member (axial force member) 3 are joined at a certain angle α which is not a right angle. The brace member 3 is connected to the steel frame column 1 and the long bolt via the gusset plate 11. 10 is joined to enable transmission of shearing force and tensile force (or compression force, the same applies hereinafter).

A tensile axial force Q generated in the brace member 3
d can be considered as the resultant force of the horizontal force N and the shearing force Q at the center of gravity position (force point) K point of the portion where the gusset plate 11 and the brace member 3 are joined.

Therefore, the balance of the forces will be examined. First, the shearing force Q is balanced with the resultant force (q ₁ + q ₂ ) of the shearing forces q ₁ and q ₂ that the upper and lower bolt joints bear. The horizontal force N is the tensile force T that the upper and lower bolt joints bear.
₁ and T ₂ will be balanced with the resultant force (T ₁ + T ₂ ). Next, when considering the balance of moments, the point c around the point c due to the eccentricity e between the point K of the center of gravity (point of force) and the line of action Y of the shearing force to be borne by the upper and lower bolt joints originally. It is reasonable to consider the effect of the moment generated on the. However, in order to simplify the problem, the tensile axial force Qd and the line of action of the force are the line of action Y of the shearing force.
Consider the moment around the intersection d. In this case, since there is no so-called "arm", the moment is zero.

Then, according to the above conditions, it should be assumed that the horizontal force N acts on the intersection point d as shown by the dotted line N in FIG.

Then, the magnitudes of the tensile forces T ₁ and T ₂ as reaction forces against the horizontal force N are determined by the magnitudes of the distances a ₁ and a ₂ from the point d to the action line of the reaction force T ₁ or T _2. It will be inversely proportional to Thus, it is clear that the pulling forces T ₁ and T ₂ illustrated in FIG. 9 have a non-identical (not equal) relationship so that the vector lengths of the pulling forces T ₁ and T ₂ are greatly different.

Concretely, a calculation example of the embodiment will be shown. The horizontal force N is 431.2 kN (44 tons), the shearing force Q is 235.2 kN (24 tons), and the eccentricity e is 15
cm, the distance between the upper and lower bolt joints (a ₁ + a ₂ ) is 30 cm
, The tensile force that the upper bolt joint bears −
T ₁ is 156.8 kN (16 tons), but the tensile force borne by the lower bolt joint-T ₂ is 274.4.
The size is kN (28 tons). On the contrary, when the compression axial force Qd acts, the force relationship is exactly opposite.

Therefore, in the case of the above calculation example, the long bolt 1
As for the diameter of 0, naturally, the magnitude of the tensile force −T ₂ (28 tons) that the lower bolt joint bears must be calculated as the design load, and the tensile force that the upper bolt joint bears −T ₁ It is a very uneconomical design against. Depending on the design of the eccentricity e and the design of the intervals a ₁ and a ₂ between the upper and lower bolt joints, the tensile force −T ₁ becomes zero, or conversely, the tensile force that the lower bolt joints bear − T ₂
There is a concern that will become a maximum and become an uneconomical design that is impossible to design.

Therefore, the object of the present invention is not only applicable to a newly built building but also easily applicable to an existing building, and provides a joining method and a joining structure of bolt joining which solves the above uneconomical design. It is to be.

A specific object of the present invention is that the tensile forces T ₁ and T ₂ imposed on the upper and lower bolt joints become substantially equal,
An object of the present invention is to provide a joining method and a joining structure of a bolt joint that enables economical design.

[0018]

[Means for Solving the Problems] As a means for solving the above-mentioned problems, a method for joining steel braces and the like according to the invention described in claim 1 is an axial force member such as steel braces and the other side of a pillar or the like. It is a joining method that joins members with a long bolt at a non-right angle and enables transmission of shearing force and tensile force.A gazette plate is joined to the end of an axial force member, and the gazette plate is joined. It is characterized in that a mating member and a plurality of long bolts are joined in the horizontal direction, and the position of the resultant force of the plurality of long bolts and the extension line of the center line of the axial force of the axial force member intersect. And

According to a second aspect of the present invention, there is provided a joint structure for steel braces or the like, in which an axial force member such as a steel frame brace and a mating member such as a column are joined with a long bolt at a certain non-right angle, and shearing is performed. It is a joint structure that enables transmission of force and tensile force, and a gusset plate is joined to the end of the axial force member, and the gusset plate uses a mating member and a plurality of long bolts in the horizontal direction. It is characterized in that they are joined, and the position of the resultant force of the plurality of long bolts and the extension line of the center line of the axial force of the axial force member intersect.

According to a third aspect of the present invention, in the joining structure for steel braces or the like according to the second aspect, the axial force member is a reinforcing brace member, and the counterpart member thereof is an existing or new steel pipe column, and the gazette. The T-shaped member is joined to the plate at the bolt-joining position, and the T-shaped member is joined to the steel pipe column by a plurality of long bolts.

According to a fourth aspect of the present invention, in the joint structure for steel braces or the like according to the second aspect, the axial force member is a reinforcing brace member, and the mating member is an existing or new H steel column, and the gazette. A T-shaped member is joined to a plate at a bolt-joining position, a C-shaped steel-like reinforcing member is sandwiched between flanges of an H steel column, and deformation of the flange is restrained by the reinforcing member. Is joined to the H steel column with long bolts.

According to a fifth aspect of the present invention, in the joint structure of steel braces or the like according to the second aspect, when the cross section of the steel pipe column is circular, the T-shaped member contacts the outer peripheral surface of the steel pipe column. The parts are characterized by being filled with a filler.

According to a sixth aspect of the present invention, in the joint structure such as the steel frame brace according to the third or fourth aspect, the reinforcing brace is arranged in the surface of the column beam frame, and the long bolt is
The H steel column is characterized by penetrating the steel column in the horizontal direction parallel to the surface of the column beam structure.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows an embodiment of a joining method and joining structure for a steel brace or the like according to the invention described in claims 1 and 2.

The configuration of the embodiment shown in FIG. 1 is basically similar to the example of FIG. That is, an example of a method or structure for joining the axial force member 3 such as a steel brace and the mating member 1 such as a pillar at a certain non-right angle α is shown. The gusset plate 11 is joined to the end portion of the axial force member 3 with a plurality of bolts (or by welding or the like), and the gusset plate 1
1 is joined by using a steel pipe column 1 as a mating member and a plurality of long bolts 10 in a horizontal direction, thereby making it possible to transmit shearing force and tensile force (or compression force). Therefore,
For example, it can be suitably applied to joining the braces 3 as shown in FIG.

In the embodiment shown in FIG. 1, as shown in FIG. 2, braces 3 as axial members are arranged in the construction planes of the beam structures 1 and 2, and the long bolts 10 are square steel pipe columns 1. Against
It is fastened in an arrangement that penetrates in the horizontal direction parallel to the construction surface of the column-beam frame (the invention according to claim 6). Therefore, according to this structure, even if it applies to an existing building, it can be implemented without any trouble. The same applies to applicability to new buildings.

To the gazette plate 11 of the axial force member 3 (reinforcing brace member), a T-shaped member 13 (or CT steel) is joined by welding or the like at each joining position of the long bolts 10. The material 13 is firmly joined to the steel pipe column 1 by a plurality of long bolts 10 (invention described in claim 3). That is, it is for the purpose of concentrating the tightening force of the plurality of long bolts 10 on each T-shaped member 13. For the same purpose, T-section steel 13 is also used on the opposite side of the steel pipe column 1.

The features of the present invention are the following configurations. In FIG. 1, the reaction force (=) generated in the plurality of long bolts 10 respectively collected in the upper T-shaped member 13 and the lower T-shaped member 13.
Composite point c of tensile forces T ₁ and T ₂ (position of resultant force,
This position is a position equidistant from the line of action of the tensile forces T ₁ and T ₂ and is a = a. ) And the intersection line d where the extension line of the center line of the axial force Qd in the axial force member 3 joined to the gusset plate 11 intersects with the action line Y of the shearing force q (compared with the configuration of FIG. 1). I want to be done.)

As a result, the force balance of this joint structure can be explained as follows. As already described with reference to FIG. 9, the tensile axial force Qd generated in the brace member 3 is the horizontal force N at the center of gravity position (force point) K of the portion where the gusset plate 11 and the brace member 3 are joined. It can be considered as the resultant force with the shearing force Q.

As a balance of the above forces, first the shearing force Q
Is balanced with the resultant force (q ₁ + q ₂ ) of the shearing forces q ₁ and q ₂ that the bolt joints of the upper and lower T-shaped members 13 bear. Horizontal force N
Is the tensile forces T ₁ and T ₂ that the upper and lower long bolts 10 bear.
Will be balanced with the resultant force (T ₁ + T ₂ ).

Next, regarding the balance of moments,
Again, in order to simplify the problem, the tensile axial force Qd and the intersection point d at which the action line of the force intersects the action line Y of the shearing force q.
Considering the moment around (also point c), there is no so-called "arm", so the moment is zero.

Under the above conditions, it can be assumed that the horizontal force N acts on the intersection d as shown by the dotted line N in FIG.

Therefore, the magnitudes of the tensile forces T ₁ and T ₂ generated in the long bolt 10 as reaction forces against the horizontal force N are as described above from the point d or the point c to the reaction force T ₁ or T.
Since equal magnitude of distance a to the _second working line, as shown equal vector length in FIG. 1, the tensile force T ₁ and T
₂ are the same (or equally divided) relationship (T ₁ = T ₂ =
N / 2).

Therefore, the diameter of each long bolt 10 can be designed with the magnitude of the reaction force (N / 2) as the design load, resulting in an extremely economical design.

FIG. 3 shows that the gusset plate 11 has three upper and lower parts.
An embodiment in which individual T-shaped members 13 are provided at equal intervals a and the line of action of the axial force Qd of the axial member 3 intersects with the combined position c of the reaction forces at which the central T-shaped member 13 is located Shows. Therefore, the reaction forces T ₁ , T ₂ , and T ₃ of the long bolt 10 are N / 3 and of equal magnitude.

Contrary to FIG. 4, one T-shaped member 13 is provided on the gusset plate 11, and the line of action of the axial force Qd of the axial member 3 is the point c of the reaction force at which the T-shaped member 13 is located. 2 shows an embodiment having a configuration intersecting with. Therefore, the long bolt 10
The reaction force T _{2 of} is equal to the horizontal force N.

FIG. 5 shows an embodiment in which the column is an existing or new H steel column 20 in the joining structure such as a steel brace having the above-mentioned structure. Also in this case, the T-shaped member 13 is joined to the gusset plate 11 of the axial force member (reinforcement brace member) not shown in the drawing at the joining position of the long bolt 10. On the other hand, C between the flanges of the H steel column 20
A steel-shaped reinforcing material 14 is sandwiched inward, and the reinforcing material 1
The flange 4 is restrained so that the flange is not deformed (falling inward). Then, the T-shaped member 13 is firmly joined to the H steel column 20 by the long bolt 10 (the invention according to claim 4).

FIG. 6 shows an embodiment in which the cross-section of an existing or new column is a circular steel tube column 21 having a circular shape in the joining structure of steel braces or the like having the above-mentioned configuration. Also in this case, the T-shaped member 13 is joined to the gusset plate 11 of the axial force member (reinforcement brace member) not shown in the drawing at the bolt joint position, and the T-shaped member is secured by the long bolt 10 penetrating the circular steel pipe column 21. 13 is firmly joined to the circular steel pipe column 21. The gap generated between the circular steel pipe column 21 and the T-shaped member 13 is filled with a filler 15,
It is configured such that the tightening force of the long bolt 10 works effectively (the invention according to claim 5).

[0039]

According to the joining method and joining structure for the steel braces and the like according to the invention described in claims 1 to 6, the reaction forces (tensile forces T ₁ , T _2, etc.) generated in the long bolts 10 are always the same. (Or divided into equal parts), so each long bolt 10
The diameter can be extremely economically designed with the magnitude of the reaction force as a design load.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a joining method and joining structure for a steel brace and the like according to the present invention.

FIG. 2 is a horizontal sectional view of FIG.

FIG. 3 is an explanatory diagram showing a different embodiment of the present invention.

FIG. 4 is an explanatory view showing still another embodiment of the present invention.

FIG. 5 is a horizontal sectional view showing a different embodiment of the present invention.

FIG. 6 is a horizontal sectional view showing still another embodiment of the present invention.

FIG. 7 is an elevational view showing an installation example of seismic reinforcement braces.

FIG. 8 is an elevation view showing an installation example of a frame steel frame and a steel frame brace.

FIG. 9 is an explanatory diagram showing an example of a conventional joining method and a joining structure.

[Explanation of symbols]

1 pillar (counterpart member) 3 axial force materials 11 Gazette plate 10 long bolt c Resulting position K intersection 13 T-shaped material 20 H steel pillar 14 Reinforcement material 15 Filler 21 circular steel pipe pillar

Continued front page    F-term (reference) 2E125 AA04 AA33 AB01 AB16 AB17                       AC15 AC16 AG03 AG12 AG45                       BB02 BB12 BB22 BC09 BD01                       BE08 BF06 CA05 CA14

Claims (6)

[Claims] 1. A joining method, wherein an axial force member such as a steel brace and a mating member such as a column are joined with a long bolt at a certain non-right angle to enable transmission of shearing force and tensile force. Joining a gusset plate to the end of the axial force member, and joining the gusset plate to a mating member using a plurality of long bolts in a horizontal direction, a position of the resultant force of the plurality of long bolts, and a shaft. A method of joining steel braces or the like, characterized by intersecting an extension line of a center line of an axial force in a strength member. 2. An axial force member such as a steel brace and a counterpart member such as a column are joined with a long bolt at a non-right angle.
It is a joint structure that enables transmission of shearing force and tensile force, and a gusset plate is joined to the end of the axial force member, and the gusset plate uses a mating member and a plurality of long bolts in the horizontal direction. Are joined together, and the positions of the resultant force of the plurality of long bolts and the extension line of the center line of the axial force in the axial force member are arranged to intersect, joining of steel braces and the like. Construction. 3. An axial force member is a reinforcing brace member, and a counterpart member thereof is an existing or new steel pipe column, and a T-shaped member is joined to a bolt joint position of a gusset plate. The joint structure for steel braces or the like according to claim 2, characterized in that the long pipes are joined to the steel pipe columns. 4. An axial force member is a reinforcing brace member, a counterpart member is an existing or new H steel column, and a T-shaped member is joined at a bolt joint position of a gusset plate. 3. A C-shaped steel-like reinforcing material is sandwiched between and the deformation of the flange is restrained by the reinforcing material, and the T-shaped material is joined to the H steel column by a long bolt. Joint structure such as steel braces described in. 5. The method according to claim 2, wherein when the cross section of the steel pipe column is circular, the contact portion between the T-shaped member and the outer peripheral surface of the steel pipe column is filled with a filler. Joining structure for steel braces. 6. Reinforcement braces are arranged in the framing structure of a post-beam frame, and long bolts, H steel columns are pierced through a steel frame column in a horizontal direction parallel to the framing frame of the post-beam frame. And
A joint structure such as the steel brace according to claim 3 or 4.