JPH04327621A - Joint part of square steel pipe column and steel beam and joint metal therefor - Google Patents

Abstract

PURPOSE:To facilitate the jointing of a square steel pipe column and steel beam, reduce costs and enhance the preciseness and strength of a steel structure. CONSTITUTION:Eight pieces of joint metals 3 are attached to the four corners of a square steel pipe column 1 on the level of upper and lower flanges of a H-section steel beam 2. The joint metal 3 comprises vertical part 4 having cross-shaped horizontal section and two pieces of horizontal parts 5 which are perpendicular to each other. A plurality of bolt holes 6 are provided in the part 4 and part 5. The vertical part 4 of the metal 3 is jointed to the corner of the column 1 by means of high tension bolts 7 to form belt-shaped reinforcements having required width over the outer surface of the column 1 using the parts 4. The H-section steel beams 2 which are perpendicular to each other are jointed to two horizontal parts 5 of each of the metals 3 by means of high tension bolts 7.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a joint between a square steel pipe column and a steel beam having upper and lower flanges such as an H-shaped steel beam, and a joining hardware used in the joint, and mainly relates to a steel-framed architectural structure. used for things.

0002

2. Description of the Related Art Conventionally, there are the following structures for joints between steel pipe columns and H-shaped steel beams.

(1) Diaphragm type Conventionally, when joining a steel pipe column and an H-shaped steel beam by welding, a diaphragm 21 is often used as shown in FIG. The short beam 2' is welded to the long beam 2 through the splice plate 22, and the short beam 2' and the long beam 2 are joined with high-strength bolts 23 through the splice plate 22.

(2) Stiffener ring type As shown in FIG. 12, a stiffener ring 28 is welded around the steel pipe column 1, and a beam is connected via this stiffener ring 28 by welding or high-strength bolts.

(3) Long tightening high-strength bolt tension joint type As an example of a high-strength bolt joint, as shown in FIG. In some cases, the beam 2 is tension-bonded with a long tightened high-strength bolt 25. (Refer to Matsui, Tsuda, et al.; Experimental research on steel pipe-concrete column-beam joints using long-tight, high-strength bolt tension connections, Abstracts of Academic Lectures at the Architectural Institute of Japan Conference, October 1989).

(4) Inserted diaphragm type The example shown in FIG. 14 is also an example of high-strength bolt connection, and the column 1 and beam 2 are connected via the end plate 24 and the cast iron insert diaphragm 26.
are joined with high-strength bolts 27 (Japanese Patent Application Laid-Open No. 63-251)
540 publication).

[0007]

However, the above-mentioned prior art has the following problems.

[0008] In the case of the diaphragm type (1), the number of machining steps is extremely large in the assembly stage, increasing costs, and cutting and welding the columns is not preferable in terms of the accuracy of the frame. It has also been pointed out that the scallops created during welded joints are a fatal structural defect (Kanaya, Tabuchi et al.; Effect of joint details on mechanical properties of steel pipe column/beam joints - Part 4) Influence of secondary bending stress on beam flange, Architectural Institute of Japan Annual Conference Abstracts, 1989 1
(See October).

[0009] In the case of (2) using a stiffener ring, welding work in a factory cannot be avoided, so there are other problems such as restrictions on factory equipment depending on the cross section of the member and high construction costs. Since a large protruding portion is formed on the pillar member, the bulk becomes large, which is disadvantageous in terms of transportation to the site. Also, similar to (1), problems due to scallops also occur.

(3) In the long-tight, high-strength bolt tension joint method, the left and right beams must be joined at the same time on site, and filling with concrete is necessary to strengthen the joint. is a big disadvantage during construction.

Although the interpolated diaphragm type (4) saves time in the assembly step, the joint portion has a closed cross section, resulting in a complicated structure, which poses a problem in terms of cost.

The present invention aims to solve the above-mentioned problems in the prior art, and facilitates the joining of square steel pipe columns and steel beams, reduces costs, and improves the accuracy and strength of steel structures. The purpose is to increase the

[0013]

[Means for Solving the Problems] The joint between the rectangular steel pipe column and the steel beam of the present invention uses a joining metal fitting having a vertical part and a horizontal part, and the vertical part of the joining metal piece is provided with a strip-shaped reinforcement having a required width in the vertical direction. In addition to forming a section, the upper and lower flanges of a steel beam such as an H-beam can be bolted to the horizontal section.

A plurality of joining hardware are arranged to surround the square steel pipe column at the height of the flange of the steel beam, and the vertical part of each joining hardware is brought into contact with the outer peripheral surface of the square steel pipe column, and the square steel pipe is connected by bolting or welding. Attach to the pillar. This joint hardware has a T-shaped vertical section at the joint with the square steel pipe column, and the flange of the steel beam is bolted to the horizontal part using high-strength bolts or the like.

One of the joining hardware of the present invention has a vertical section having a cross-shaped horizontal section and two horizontal sections for joining flanges of steel beams in directions orthogonal to each other. In this joining hardware, the cross-shaped vertical part is brought into contact with the corner of the outer circumferential surface of the square steel pipe column, and is attached to the outer circumferential surface of the square steel pipe column by bolting, and the steel beam is attached to the two horizontal parts in a direction perpendicular to each other. Bolt the flange.

Another joining hardware of the present invention is formed on the outside of the L-shaped vertical part for joining a vertical part having an L-shaped horizontal cross section and a flange of a steel beam in a direction orthogonal to each other. It has one continuous horizontal section. In this joint hardware, the L-shaped vertical part is brought into contact with the corner of the outer circumferential surface of the square steel pipe column, and is attached to the outer circumferential surface of the square steel pipe column by bolting, and the flanges of the steel beams in the directions perpendicular to the horizontal part are attached to the outer circumferential surface of the square steel pipe column. Bolt the parts together.

[0017] These joints can be manufactured by processing shaped steel such as angles and channels, or steel plates. Furthermore, since the shape is simple, it can be mass-produced relatively easily on a factory line.

By attaching a plurality of joints to cover the four corners of the square steel pipe column, the stress transmitted from one steel beam is reliably transmitted to the orthogonal plane, and the stress transmitted from the steel beam is reduced. It is dispersed and transmitted to the square steel pipe column.

[0019] Furthermore, the square steel pipe column is surrounded by a joining metal fitting whose vertical section is T-shaped in the vertical part and the horizontal part, and a strip-shaped stiffening part with the required width in the vertical direction is formed by the vertical part, and each horizontal part is continuous. By doing so, it is also possible to configure a continuous stiffener ring surrounding the square steel pipe column. In this case, the stress transmitted from the steel beam through the stiffener ring formed at the flange level can be dispersed and transmitted to the square steel pipe column.

[0020] Furthermore, since all of the above joining operations can be performed by bolt joining using high-strength bolts or the like, it is possible to significantly reduce the number of welding operations at the site.

[0021]

[Function] In general, in order for the column-beam joint panel zone to exhibit sufficient strength and rigidity, appropriate stiffening against local deformation of the steel pipe wall must be provided at the beam flange level of the joint panel. be. To achieve this, we must consider how to disperse the stress transmitted from the beam and transmit it to the steel pipe.
The key is how to stiffen the steel pipe.

[0022] In one of the inventions of the present application, the stress from the steel beam is first spread to the entire width of the square steel pipe column by the horizontal part of the joint hardware, and furthermore, since the joint hardware is continuous at the four corners of the square steel pipe column, Stress can be reliably distributed and transmitted even to planes in the orthogonal direction. In addition, since the square steel pipe column is surrounded by metal fittings, the square steel pipe column is stiffened at the steel beam flange level. As a result, local deformation of the square steel pipe column can be prevented, and the shear strength and rigidity of the panel section can be increased.

[0023] The joint between the square steel pipe column and the steel beam, which is another aspect of the present application, has many mechanical features in common with the stiffener ring type stiffening described in the prior art section, but A stiffener ring can be formed by bolting to the outer peripheral surface of the stiffener ring.

[0024] Local deformation of the square steel pipe column can be prevented by transmitting the stress transmitted from the flange of the steel beam to the stiffener ring formed on the outer peripheral surface of the square steel pipe column without directly transmitting it to the square steel pipe column. To prevent. As a result, local deformation of the square steel pipe column can be prevented, and the shear strength and rigidity of the panel section can be increased.

[0025]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention, in which a square steel pipe column 1 and a plurality of joining hardware 3, and a joining hardware 3 and an H-shaped steel beam 2 each have a plurality of high-strength bolts 7. It is joined by

The joining hardware 3 has a vertical section 4 whose horizontal cross section is cross-shaped.
Two horizontal ribs are provided as the horizontal portion 5 on the pipe, and the vertical cross section at the joint with the square steel pipe column 1 is T-shaped. A plurality of bolt holes 6 are provided in the vertical part 4 and the horizontal part 5, respectively.
is formed, and the square steel pipe column 1 is fixed by high-strength bolt 7.
and the H-shaped steel beam 2.

As shown in the figure, the joining hardware 3 is an H-shaped steel beam 2.
A total of 8 pieces are attached to cover the four corners of the square steel pipe column 1 at heights corresponding to the upper and lower flanges of Shaped steel beams 2 are joined.

In this embodiment, the joining hardware 3 is bolted to the rectangular steel pipe column 1, but it may also be welded. In addition, the transmission of shear force from the H-beam 2 is to the joint metal fitting 3.
Alternatively, as shown in FIG. 4, a web joining hardware 8 may be provided on the square steel pipe column 1, and this and the H-shaped steel beam 2 may be joined by bolts or welding. good.

FIG. 5 shows another embodiment. In this embodiment, a vertical portion 4a having an L-shaped horizontal cross section is used as the joining metal.
A metal joint 3a having a structure in which a horizontal rib serving as a horizontal portion 5a is attached without being divided is used.

In this embodiment, the four corners of the square steel pipe column 1 are covered with 8
The horizontal portions 5a of the joint metal fittings 3a form a stiffener ring, and the flow of stress becomes clear.

FIGS. 6 to 8 show still other embodiments of the present invention, in which the horizontal cross section of the vertical part is U-shaped (joint hardware 3b), and L-shaped (joint hardware 3b). Two types of hardware 3b') are used. Each joining metal fitting 3b
, 3b' have horizontal parts 5b, 5b' in the vertical parts 4b, 4b'.
is attached to the square steel pipe column 1, and both have a T-shaped vertical cross section at the joint with the square steel pipe column 1.

As shown in the figure, all the joining metal fittings 3b, 3b
Bolt-bonded to the square steel pipe column 1 with high-strength bolts 7 so that the horizontal parts 5b, 5b' of A continuous stiffener ring is formed by the vertical portion 4b and the horizontal portions 5b, 5b' continuous to the outer periphery thereof.

In this embodiment, the vertical portion 4b of the joining hardware 3b is bolted to the square steel pipe column 1, but it may be welded. Further, the shear force from the H-shaped steel beam 2 may be transmitted by frictional force generated between the joining hardware 3b and the square steel pipe column 1, but as shown in FIG. , and the H-shaped steel beam 2 may be joined by bolts or welding.

The embodiment shown in FIG. 10 is a modification in which the dividing method of the joining hardware is changed. In the embodiment shown in FIGS. 6 to 8, two types of joining hardware 3b are used at the joint of the square steel pipe column 1.
, 3b' are used, with a total of 16 pieces.
In the embodiment No. 0, two types of joining metal fittings 3c and 3c' are used for a total of 8
Use pieces. Similar to the embodiments of FIGS. 6 to 8, the vertical section 4
c and 4c' form a band-shaped stiffening part having a required width in the vertical direction, and together with the horizontal parts 5c and 5c' form a stiffener ring.

[0036]

[Effects of the invention] ■ By attaching joining hardware to cover the four corners of the square steel pipe, local deformation of the steel pipe can be prevented and the strength and rigidity of the panel zone at the column-beam joint can be dramatically increased. .

(2) The same effect as (2) can also be obtained when a plurality of joint metal fittings surround a square steel pipe column to form a stiffener ring in which the horizontal portions of the joint metal fittings are continuous.

[0038] The joining hardware has a simple structure consisting of a vertical part, a horizontal part, and a bolt hole, and is easy to manufacture.

[0039] The rectangular steel pipe column and the steel beam can all be joined using only bolts, eliminating the need for on-site welding work, significantly improving work efficiency and transportation efficiency, and reducing costs.

[0040] Since the columns and beams are not cut short, the precision of the frame can be improved.

[Brief explanation of drawings]

FIG. 1 is a horizontal sectional view showing an embodiment of the present invention.

FIG. 2 is an elevational view of the embodiment of FIG. 1;

FIG. 3 is a vertical sectional view of the embodiment of FIG. 1;

FIG. 4 is a vertical sectional view showing a modification of the embodiment of FIG. 1;

FIG. 5 is a horizontal sectional view showing another 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 of the embodiment of FIG. 6;

FIG. 8 is a vertical cross-sectional view of the embodiment of FIG. 6;

9 is a vertical sectional view showing a modification of the embodiment of FIG. 6; FIG.

FIG. 10 is a horizontal sectional view showing still another embodiment of the present invention.

FIG. 11 is a perspective view showing a conventional example.

FIG. 12 is a perspective view showing another conventional example.

FIG. 13 is a perspective view showing another conventional example.

FIG. 14 is a perspective view showing another conventional example.

[Explanation of symbols]

1... Steel pipe column, 2... Beam, 3... Joining hardware, 4... Vertical part, 5
...Horizontal part, 6...Bolt hole, 7...High strength bolt, 8...Web joining hardware

Claims (5)

[Claims] 1. At a joint between a square steel pipe column and a steel beam having upper and lower flanges, a vertical part of a required width that contacts the outer peripheral surface of the square steel pipe column and a horizontal part provided at right angles to the vertical part. A plurality of joint metal fittings having the following properties are arranged at the height of the flange of the steel beam, and the vertical portions of the respective joint metal fittings are joined to the square steel pipe column to form a band-shaped stiffening part surrounding the square steel pipe column. At the same time, a joint between a square steel pipe column and a steel beam, characterized in that the horizontal part of the joining hardware and the flange of the steel beam are joined by bolts. 2. The rectangular steel pipe column and steel according to claim 1, wherein the vertical portion of the joint metal has two perpendicular surfaces that contact adjacent surfaces spanning corner portions of the outer circumferential surface of the rectangular steel pipe column. Beam joint. 3. A joining hardware for joining flanges of steel beams in directions orthogonal to each other to the outer circumferential surface of a square steel pipe column, the fittings comprising two adjacent parts that straddle corners of the outer circumferential surface of the square steel pipe column. a vertical portion having a cross-shaped horizontal cross section and having a bolt hole for bolting to the two surfaces and abutting to the flange surface of the steel beam and bolting to the flange surface A joining hardware having two horizontal parts with bolt holes formed therein. 4. A joining hardware for joining flanges of steel beams in directions perpendicular to each other to the outer circumferential surface of a square steel pipe column, wherein two adjacent flanges straddle corners of the outer circumferential surface of the square steel pipe column. a vertical portion having an L-shaped horizontal cross section and having a bolt hole for bolt connection to the two surfaces; A joining hardware having one continuous horizontal part with a bolt hole formed therein for bolt joining. 5. The joint between a square steel pipe column and a steel beam according to claim 1, wherein each horizontal portion of the plurality of joint metal fittings constitutes a continuous stiffener ring surrounding the square steel pipe column.