JP2001182154A - Joint structure between column and beam with connection metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint stricture between a column and beam with a connection metal, where, at four corners of a rectangular steel pipe column, no complete penetration welding is required for reduced manufacturing processes, solving the problem of complexity in structural analysis. SOLUTION: A first flat steel is welded, along the side surface of a rectangular steel pipe column, to the side surface of the steel pipe column in facing confronting the X-direction at a part to which an upper flange of beam is jointed while protruding beyond the width of column, and likewise, a second flat steel is welded, along the side surface of the steel pipe column to the upper side surface of the first flat steel, in the Y-direction of the steel pipe column, while protruding beyond the width of the steel pipe column. A third flat steel is placed and welded horizontally on the part of the first flat steel protruding beyond the steel pipe column, and likewise, a fourth flat steel is horizontally welded to the lower side of second flat steel. A part for welding to a lower flange of the beam is so configured as to be symmetrical with the upper flange part of beam, to provide a connection metal. The upper and lower, third and fourth, flat steels welded horizontally to the connection metal are jointed to the flange of beam, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a steel pipe column and a beam by a fitting.

[0002]

2. Description of the Related Art In a steel structure of a building, designing and constructing a joint between a pillar and a beam which is safer and more economical is an eternal problem. Has been disclosed. Typical examples are as follows.

[0003] Inner diaphragm system. Generally, the horizontal force of a beam generated during an earthquake is transmitted to a flange of an adjacent beam through a horizontal diaphragm inside a column, thereby ensuring the safety of the structure. However, it is generally not possible to provide a diaphragm inside a steel pipe column because it is a work in a closed area.

[0004] However, electroslag welding is applied to an assembled box-type prism, but requires extremely advanced technology and large-scale equipment. In addition, a wide range of processed parts is exposed to high temperatures, which may cause deterioration of the mechanical properties of the materials of the columns and the diaphragm, and require sufficient care.

In order to further increase the rigidity of the column, when filling the inside of the steel tube column with concrete, a hole is formed in the inner diaphragm to improve the filling property of the concrete. In order to obtain sufficient filling without entrapping air in the lower part of the diaphragm, a considerably large hole or a plurality of holes are required. Therefore, there is a disadvantage that the strength as the diaphragm, that is, the effect is reduced.

[0006] Through-diaphragm system. Instead of applying electroslag welding, which requires advanced technology and large-scale equipment, it is a method of assembling the cut pillar on the part where the beam is to be joined, cutting through the beam, and penetrating the beam. . In this case, not only the number of welding points increases, but also it becomes difficult to ensure the assembling accuracy of the column. In addition, the filling property of concrete has the same drawback as that of the inner diaphragm.

[0007] Outer diaphragm type. In order to solve the complexity of processing the above two structures and the filling property of concrete, an outer diaphragm system has been developed. However, in the general outer diaphragm method, a star-shaped flat plate is welded to the beam joint part of the column, so not only the star-shaped flat plate (outer diaphragm) becomes large, but also because the diaphragm is a flat plate, There was a disadvantage that the out-of-plane proof stress was weak.

[0008] In view of the demand for safety at the end of the beam based on the current situation and the experience of the Great Hanshin Earthquake as described above, a. Beam joint structure. b, A joint structure between a column and a beam, which has a large endurance at the end of the beam and good performance. c, A joint structure between a column and a beam, which can secure filled concrete in a steel tube concrete structure. For the purpose of providing a joint, the present inventor has invented a joint structure between a column and a beam by a metal fitting as shown in FIG. 7 (Japanese Patent Application No. 10-306782).

That is, a long cylindrical member into which a pillar can be inserted is cut into a predetermined length, and both left and right flanges of the member formed into an H-shaped section are parallel to the axis of the cut cylindrical member. In addition, one of the webs having the H-shaped cross section is welded at right angles to the axis of the cut cylindrical member to form a joint, and the joint is used to join a beam. Is welded by being inserted into the joint portion of No. 2, and the flange of the H-shaped beam is fixed to the web of the joint fitting that is not welded to the column of the member formed in the H-shaped cross section.

However, in this method, at a level of the same height, the periphery of the column is surrounded by a cross-shaped steel material by a cross-shaped girder, so that the strip-shaped steel material intersects at four corners at right angles. Therefore, the joining at this intersection requires a full penetration welding, which requires a large number of man-hours for production. Further, at this intersection, it may be necessary to simultaneously transmit the forces in the X direction and the Y direction of the beam at the same time, which complicates the structural analysis.

An object of the present invention is to solve these problems by using a strip-shaped steel material not in the same level but in steps in the X and Y directions of the beam.

[0012]

According to a first aspect of the present invention, a first flat steel is formed by projecting a first flat bar from a width of a column of a rectangular steel tube column to a side in an X direction opposite to a portion where an upper flange of a beam is to be joined. A third flat steel is mounted and welded horizontally to a portion of the first flat steel projecting from the steel pipe column, which is fixed along the side surface of the steel pipe column, and the first flat steel is fixed to a side surface in the Y direction of the steel pipe column. A second flat bar is fixed on the flat bar and the third flat bar along the side surface of the steel pipe column,
A fourth flat bar is horizontally welded to the lower side of the second flat bar, and a portion where the lower flange of the beam is to be joined is configured symmetrically with a portion of the upper flange of the beam to form a fitting. A joint structure of a column and a beam by a joint fitting, wherein a flange of a beam is joined to the upper and lower third and fourth flat bars horizontally welded to the joint fitting. And

According to a second aspect of the present invention, in the fitting of the first aspect, the third flat steel and the fourth flat steel at the portion where the upper flange of the beam is to be joined and the portion at the portion where the lower flange of the beam is to be joined. Between the third and fourth flat bars, the flanges of the beams are respectively joined to the third and fourth flat bars above and below the connection bar provided with ribs. The point is that the joint structure is adopted.

According to a third aspect of the present invention, the first and second flat bars in the fitting according to the first or second aspect are constituted by using a mold steel in place of the flat bar, and The gist of the present invention is a joint structure between a column and a beam using a fitting, which is formed by joining a flange of a beam to upper and lower third and fourth flat bars welded horizontally.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view in the case of a square steel tubular column according to the first aspect. The first flat bars 1 and 1 are welded along the side surfaces of the steel pipe column to project from the width of the steel tube column on opposite sides of the rectangular steel tube column where the upper flange of the beam is to be joined. Similarly, on the first flat bars 1 and 1, second flat bars 2 and 2 are welded to the opposite side surfaces in the Y direction along the side surfaces of the steel pipe columns. Thereafter, a third flat bar is mounted on a portion of the first flat bar 1, 1 protruding from the steel tube column in the X direction and welded horizontally, and similarly, the lower side of the flat bar 2, 2 in the Y direction. The fourth flat steel 4 is welded horizontally. Similarly, the first flat bar 1 'and the second flat bar 2' are welded in the X direction and the Y direction at the portion where the lower flange of the beam is to be joined. At the construction site, the beam flanges are welded to the upper and lower third flat bars 3, 3 'and the upper and lower fourth flat bars 4, 4', or fastened with high-strength bolts to join the beams to the columns.

FIG. 2A is an elevation view in the Y direction of FIG. 1, and FIG. 2B is an elevation view in the X direction. FIG. 3 is a plan view of FIG. FIG. 5 is a variation of FIG.
First, as shown in FIG. 4, the gusset 13 is welded to the pillar,
The beam B is temporarily attached to the gusset 13. The tacking may be by bolting or welding. Thereafter, as shown in FIG. 5, the first flat bar is attached and fixed in the X direction of the column, and the second flat bar 2 is attached and fixed in the Y direction, and the beam is joined to the column. In this case, the first flat bar and the column and the second flat bar and the column may be fastened with high-strength bolts or may be welded. However, the first flat bar and the beam and the second flat bar and the beam are fixed by welding. 4 and 5, in the case where the beam end is wider than the beam body portion,
This is the case where the flat bars 3 and 4 are omitted.

FIG. 6 is a perspective view of a square steel tubular column according to the second aspect. Reinforcing ribs 5 are provided between upper and lower third flat bars 3, 3 'and fourth flat bars 4, 4' for joining a flange of a beam. FIG. 7 is a perspective view in the case of the square steel tubular column according to the third aspect. FIG. 8 shows a variation of FIG. 7 in which the first flat bar 1 and the second flat bar 2 are welded to the opposite side surfaces in the X direction of the steel pipe column, and FIG. It is a T-shaped section steel that replaces steel.
Reference numeral 8 denotes an L-shaped cross section, reference numeral 9 denotes a triangular cross section, reference numeral 10 denotes a circular cross section, and reference numeral 11 denotes an octagonal cross section.

[0018]

The effects of the present invention are as follows.
Since the connection metal fittings are arranged by being arranged up and down differently in the direction and the Y direction, as in the case where the girder is assembled at the same level,
Since it is not necessary to perform welding at the intersection, complete penetration welding is not required. Therefore, it is possible to obtain a simple and low-cost and high-quality joint structure between a column and a beam.

Compared to the conventional outer diaphragm type joint structure, the structure is not a simple large flat plate, so that it is compact and easy to handle. Also, since there is no diaphragm inside the column, it does not hinder the filling of concrete in the steel pipe concrete structure.

[Brief description of the drawings]

FIG. 1 is a perspective view of a square steel tubular column according to the first embodiment.

FIG. 2A is an elevational view in the Y direction of FIG. 1;
(B) is an elevational view in the X direction.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a diagram showing a construction process of FIG. 5 (a variation of FIG. 1).

FIG. 5 is a view of the variation of FIG. 1, in which the third and fourth flat bars are omitted and the flange of the beam is directly welded to the column.

FIG. 6 is a perspective view of a square steel tubular column according to the second embodiment.

FIG. 7 is a perspective view in the case of a square steel tubular column according to claim 3;

FIG. 8 is a variation of FIG. 7 in which a reference numeral 7 is a T-shaped section steel in place of a square steel, a reference number 8 is a T-section section steel, a reference number 9 is a triangle section steel section, and a reference number 10 is a circular section steel. , Reference numeral 11 is a diagram in the case of using an octagonal section steel. FIG.

FIG. 9 is a perspective view of a joint structure between a column and a beam by a fitting as shown in (Japanese Patent Application No. 10-306782).

[Explanation of symbols]

A: pillar, B: beam, 1 ... first flat steel at the upper flange of the beam, 2 ... second flat steel at the upper flange of the beam, 3 ...
... the third flat steel that joins the upper flange of the beam, 4 ... the fourth flat steel that joins the upper flange of the beam, 1 '... the first flat steel at the site of the lower flange of the beam, 2' ... The second part of the lower flange
Flat steel, 3 '... 3rd flat steel joining the lower flange of the beam,
4 ': Fourth flat steel for joining the lower flange of the beam, 5: Reinforcement rib, 6: Square-shaped section steel, 7: T-section section steel, 8: L-section section steel , 9: Shaped steel with triangular cross section, 10: Shaped steel with circular cross section, 11: Shaped steel with octagonal cross section, 12: Conventional fitting, 13: Gusset

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E125 AA04 AA14 AB16 AC16 AC29 AG32 AG57 BB03 BB35 BB37 BD01 BE06 BF03 CA06 CA90 EA33

Claims (3)

[Claims] 1. A first flat bar projecting from a width of a column of a rectangular steel column to which an upper flange of a beam is to be joined at an opposite side in the X direction, and fixed along the side of the column. A third flat bar is mounted on a portion of the first flat bar protruding from the steel tube column and welded horizontally, and the first flat bar and the third flat bar are overlapped on the Y-direction side surface of the steel tube column. Then, a second flat bar is fixed along the side surface of the steel pipe column, a fourth flat bar is horizontally welded to the lower side of the second flat bar, and a portion where a lower flange of the beam is to be joined is formed. The upper and lower beams of the beam are formed symmetrically to form a fitting, and the flanges of the beam are respectively joined to the upper and lower third and fourth flat steels horizontally welded to the fitting. The joint structure of pillar and beam by the fitting hardware. 2. The fitting according to claim 1, wherein the third flat bar and the fourth flat bar at the portion where the upper flange of the beam is to be joined and the third and fourth flat bars at the portion where the lower flange of the beam is to be joined. A joint structure between a column and a beam by a fitting, wherein the flanges of the beam are respectively joined to the third and fourth flat steels above and below the fitting having a rib between the fourth flat bars. 3. The metal fittings according to claim 1 or 2, wherein the first and second flat steels are formed using mold steel instead of the flat steels, and the metal fittings are horizontally welded. A joint structure between a column and a beam by a joint fitting, wherein a flange of a beam is joined to the upper and lower third and fourth flat steels, respectively.