JP2586719B2 - Column / beam joint structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a column / beam joint structure in which a column having a closed cross section and a steel beam are joined by using a special hardware.

[Problems to be solved by the invention]

When the joint between a steel column and a column with a closed cross section such as a square steel pipe or a steel pipe is formed by penetrating the column, the internal or external steel beam flange position is located at the flange position of the column or beam. If necessary, the diaphragm is inserted horizontally as shown in FIGS.

In the structure of disposing the diaphragm, the column is cut once at the position where the diaphragm is disposed, and the column is welded and connected after the diaphragm is installed. Further, when the column is made of steel tube concrete, the filling property of the concrete near the joint is poor due to the diaphragm.

In addition, the stress transmission mechanism of the joint becomes complicated structurally,
Many unclear parts remain.

The present invention has been made in view of the actual situation of a through-column joint using a diaphragm, and proposes a structure that overcomes the above problems.

[Means for solving the problem]

In the present invention, instead of the diaphragm, the steel beam and the column are joined by using a box-shaped stiffening member circumscribing the column and a pair of joining hardware circumscribing the stiffening member and arranged on both sides of the flange of the steel beam. This solves the problems of workability and work accuracy when arranging the diaphragm.

In addition, the tensile force from the steel beam is transmitted not to the flange of the column facing the steel beam but to the opposite flange as a bearing force, thereby preventing out-of-plane deformation to the column flange and transmitting the stress. Clarify.

The stiffening member has a height corresponding to the height of the metal joint, and is composed of four backing plates overlapping the flange of the column. Since the stiffening member has a height corresponding to the height of the metal joint, the stiffening member transmits a tensile force and a compressive force from the metal joint to the flange of the column as supporting pressure.

The joint hardware consists of a side surface of the flange of the steel beam, a horizontal plate abutting on the surface of the caul plate that overlaps the flange of the column, and a vertical plate abutting on the portion that is continuous with the caul plate that overlaps the web of the column. The vertical plate protrudes from the upper and lower surfaces of the horizontal plate on the hypotenuse side, and the cross-sectional area gradually increases from the steel beam side to the column side. Make an equilateral triangle. The joint hardware is welded by hitting the horizontal plate against the flange of the steel beam,
The end surfaces of the horizontal plate and the vertical plate abut against the backing plate on the steel beam side of the stiffening member and are welded. The vertical plate and the horizontal plate of the metal joint form an H-shaped cross section together with the backing plate on a vertical cross section parallel to the axis of the steel beam.

When the vertical plate of the joint metal is welded by abutting the part continuous to the backing plate overlapping the web of the column, the tensile force from the steel beam is opposed to the steel beam via the backing plate overlapping the web of the column from the vertical plate. It is transmitted as a compressive force to the pillar from the contacting plate that overlaps the flange of the pillar on the side to be moved.

The tensile force from the steel beam is not transmitted directly to the flange on the steel beam side of the column as a tensile force, but is transmitted as a compressive force to the opposite flange. Be clear. In particular, since the compressive force transmitted from the steel beam is transmitted as a supporting force by the backing plate, stress is not concentrated on the flange on the opposite side of the steel beam, and out-of-plane deformation including local deformation is prevented.

In addition, since the joint hardware is not directly joined to the column, tensile failure at the joint between the steel beam and the column is prevented.

A bending moment acts on the stiffening member with a box-shaped cross section, which has the same distribution as when a tensile force is applied to two opposing sides of a rigidly connected quadrilateral frame on a plane due to the tensile force from a steel beam. A tensile stress is generated on the column side and a compressive stress is generated on the steel beam side near the node of the caul plate on the beam side. The bending moment acts around the vertical axis, and the joint hardware forms an H-shaped cross section with the backing plate on a vertical cross section parallel to the axis of the steel beam.
The bending moment is borne around the strong axis where the next moment is large, and the bending moment reduces the bending stress generated in the metal joint and the backing plate.

There is a gap between the end of the steel beam and the surface of the patch,
Not directly joined. Thereby, deformation of the backing plate and the flange of the column in contact with the backing plate due to the bending moment from the steel beam is avoided.

〔Example〕

According to the present invention, as shown in FIG. 1, a column 1 having a closed cross section and a steel beam 2 are stiffened by a box-shaped stiffening member 4 circumscribing the column 1 and a flange of the steel beam 2 circumscribing the stiffening member 4. This is a joint structure joined by using a pair of joint hardware 3, 3 arranged on both sides of the joint. The steel beam 2 includes a bracket located at the end on the column 1 side.

The stiffening member 4 has a height corresponding to the height of the metal joint 3, circumscribes the column 1, and is partially welded. The stiffening member 4 is composed of four flanges 41 of the column 1 and the web and overlaps the web, and is assembled into a box by welding the four security plates 41. Alternatively, a part of the box-shaped section member is used as the stiffening member 4.

The joining hardware 3 is a horizontal plate 3a that abuts against the side surface of the flange of the steel beam 2 and the surface of the backing plate 41 overlapping the flange of the column 1.
And a vertical plate 3b protruding from the upper and lower surfaces thereof and abutting on a portion connected to the backing plate 41 overlapping the web of the column 1.

The horizontal plate 3a has a right-angled triangular shape whose cross-sectional area gradually increases from the steel beam 2 side to the column 1 side as shown in FIGS. 1-I and 3-I, and the vertical plate 3b is a horizontal plate 3a. Protruding on the hypotenuse side,
As shown in FIG. 1-II and FIG. 2, it has an isosceles triangular shape whose cross-sectional area gradually increases from the steel beam 2 side to the column 1 side. Vertical plate formed on the hypotenuse side of horizontal plate 3a
3b has a function of restraining the vertical deformation of the horizontal plate 3a.
As shown in FIGS. 3A to 3I, welding grooves are formed on the two end surfaces on the joining side of the horizontal plate 3a and the end surface of the vertical plate 3b. Third
FIGS. III and IV show cross sections taken along line xx and line yy of I.

As shown in FIG. 1, the metal joints 3, 3 are located on both sides in the width direction of the flange of the steel beam 2, and the horizontal plate 3a is abutted against the flange of the steel beam 2 and welded, and the end faces of the horizontal plate 3a and the vertical plate 3b Is connected to the steel beam 2 and the column 1 by abutting against and welding to the backing plate 41 overlapping the flange of the column 1. Horizontal plate 3a
Is continuous from the flange of the steel beam 2 to the flange of the column, and the vertical plate 3b is continuous from the flange of the steel beam 2 to the backing plate 41 overlapping the web of the column 1.

In a state in which the metal joint 3 is joined to the backing plate 41, although not shown, the vertical plate 3b and the horizontal plate 3a of the metal joint 3 are H-shaped in cross section along with the backing plate 41 in a vertical section parallel to the axis of the steel beam 2. The entire H-shaped cross section of the integrated metal joint 3 and the backing plate 41 resists the bending moment due to the tensile force from the steel beam 2.

Since the steel beam 2 is attached to each flange and is joined to the column 1 by the two metal fittings 3,3, the flange of the steel beam 2 is connected to the flange of the beam 1 so as not to deform the flange of the column 1 facing the steel beam 2. The web is not bonded to the column 1 flange. Also, since there is no need to weld the flange end face of the steel beam 2 and the flange of the column 1 structurally, it is not necessary to form a groove on the end face of the steel beam 2, thereby reducing the length of the steel beam 2. A large tolerance can be obtained.

In the case where a part of the steel beam 2 is located at an end thereof and the bracket 1 to be pre-joined to the column 1 and the column 1 are to be joined at a factory, the column 1 can be laid horizontally, so that the welding direction is horizontal. Only in the direction, the workability is improved.

FIG. 2 shows the state of the flow of stress between the column and the beam.
As shown here, the tensile force from the steel beam 2 is applied to the column 1 from the vertical plate 3b via the patch 41 overlapping the web of the column 1 and from the patch 41 overlapping the flange of the column 1 on the side facing the steel beam 2. It is transmitted as a compressive force. This compressive force is transmitted as a supporting force by a backing plate 41 having a width corresponding to the height of the vertical plate 3b.

The compressive force from the steel beam 2 is transmitted to the flange of the column 1 from the backing plate 41 to which the horizontal plate 3a and the vertical plate 3b are directly welded.

〔The invention's effect〕

The stiffening member circumscribing the column and the stiffening member are joined to the steel beam using a pair of metal fittings arranged on both sides of the flange of the steel beam. The problems of workability and work accuracy when disposing are solved.

In addition, since the vertical plate of the joint metal is welded by abutting the portion continuous to the backing plate overlapping the web of the column, the tensile force from the steel beam is applied to the steel beam via the backing plate overlapping the web of the column from the vertical plate. The compressive force can be transmitted to the column from the backing plate overlapping the flange of the column on the side of the column, and the mechanism for transmitting the stress from the steel beam to the column becomes clear.

In particular, since the compressive force transmitted from the steel beam is transmitted as a supporting force by the backing plate, stress is not concentrated on the flange on the opposite side of the steel beam, and out-of-plane deformation of the column flange including local deformation is prevented. .

In addition, since the metal joint is not directly welded to the column, tensile failure at the joint between the steel beam and the column is prevented.

A bending moment acts around the vertical axis on the stiffening member with a box-shaped cross section due to the tensile force from the steel beam, but the joint hardware forms an H-shaped cross section with the backing plate on a vertical section parallel to the axis of the steel beam. As a result, a bending moment is borne around the strong axis, and the bending stress generated in the metal joint and the backing plate by the bending moment is reduced.

Furthermore, since there is a gap between the end of the steel beam and the surface of the backing plate, and there is no direct connection, deformation of the backing plate and the flange of the column in contact with the backing plate due to bending moment from the steel beam is avoided.

[Brief description of the drawings]

1 is a plan view and an elevation view showing an embodiment of the present invention, FIG. 2 is a plan view showing a mechanism for transmitting stress between a column and a beam, and FIGS. The plan view, the horizontal plate side view, and III and IV respectively show the joint hardware.
Line, yy line sectional view, FIG. 4 is a perspective view showing a conventional structure,
Fig. 5-I and II are elevation views showing other conventional structures,
It is a top view. DESCRIPTION OF SYMBOLS 1 ... pillar, 2 ... steel beam, 3 ... joint metal, 3a ... horizontal plate, 3b ... vertical plate, 4 ... stiffening member, 41 ... patch plate.

Claims (1)

(57) [Claims] 1. A box-shaped stiffening member circumscribing a column and a steel beam having a closed cross section, and a pair of metal fittings circumscribing the stiffening member and disposed on both sides of a flange of the steel beam. The stiffening member has a height equivalent to the height of the joint hardware, and is composed of four backing plates that overlap the flange of the column, and the joint hardware is connected to the side of the flange of the steel beam beam. , A horizontal plate that abuts the surface of the patch plate that overlaps the column flange,
It consists of a vertical plate that abuts on the part that is continuous with the backing plate that overlaps the web of the column.The horizontal plate has a right-angled triangular shape whose cross-sectional area gradually increases from the steel beam side to the column side. It is in the shape of an isosceles triangle whose cross-sectional area gradually increases from the steel beam side to the column side,
There is a gap between the end of the steel beam and the surface of the backing plate, and the joint hardware is welded by hitting the horizontal plate against the flange of the steel beam and the horizontal plate on the backing plate on the steel beam side of the stiffening member. And the end faces of the vertical plate are abutted and welded.
Column-beam joint structure that forms a cross section.