JPH041347A - Shape steel and concrete member using the same shape steel and post-girder joining section structure - Google Patents

Abstract

PURPOSE:To reduce the quantity of steel by forming a main body in a closed type rectangular sectional shape by using the main body in a structure as structural steel, burdening bending moment to a corner section and relatively forming an extremely thick resistance section. CONSTITUTION:Resistance sections 1b resisting bending moment are formed by concentrating steel at the corner sections of a main body 1a formed by forming shape steel 1 in a closed type rectangular sectional shape, the resistance sections 1b are positioned at the inner and outer circumferential sides, intermediate section, etc. of the main body 1a, and a sectional shape is formed in a square shape or a circular shape. The resistance sections 1b are formed in a thick shape gradually from the main body 1a, and the transmission of force among the main body 1a and the resistance sections 1b is smoothed. The resistance sections 1b at four corners and the main body 1a on the strong axial side are resisted against bending moment in one direction in the shape steel 1, and all resistance sections 1b and the main bodies 1a on both sides in the direction of the application of force are resisted similarly against bending moment in the rectangular direction. Accordingly, the wall thickness of the main body 1a can be reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a section steel mainly used as a structural member that resists bending, a concrete member using the same, and a steel beam using the same as a column. This relates to a jointed column/beam joint structure.

[Prior art and problems to be solved by the invention] Shaped steel conventionally used in the construction field includes open and closed types.
There are various shapes such as an H shape, a cross H shape, a square shape, and a circular steel pipe, as illustrated in FIGS.

When these steel sections are used alone for columns or beams, their cross-sectional performance is determined by their bending strength, and they have sufficient residual strength against shearing.

In addition, studies on earthquake and wind loads are conducted in two directions, but since the flanges on each strong side will resist the bending moment in response to external forces in each direction, the cross-sectional design will be based on the magnitude of the resistance to this bending moment. It will be enough if you do it.

This invention was made by focusing on the resistance mechanism of this shaped steel, and aims to propose a new shaped steel with a shape that is rational for bending resistance and its usage pattern.

[Means to solve the problem]

In the present invention, the net material is concentrated at the farthest position from the axis of the cross section to form a very thick resistance part relative to the main body, and this resistance part functions as a resistance element against bending moments in the x and y directions. This allows the section steel to have a reasonable cross-sectional shape for bending, while at the same time achieving a reduction in the amount of steel compared to ordinary section steel with the same cross-sectional performance.

The cross-sectional shape of the main body of the section steel is a closed rectangular cross-section.

Alternatively, it has an open X-shaped cross-sectional shape, and in the former case, a very thick resistance part is formed at the corner part, and in the latter case, a very thick resistance part is formed at the tip.

This shaped steel serves as a structural member such as a column or a beam by itself, but by being buried in concrete, it constitutes a concrete member such as a column or beam of a steel-framed concrete structure or a steel-framed reinforced concrete structure.

When used alone as a column, it is connected to the steel beam by joining special joining hardware, etc., which consists of an abutment plate that comes into contact with the side of the section steel and a bracket that extends vertically from this, to the side of the section steel. .

〔Example] The present invention will be explained below based on the drawings showing one embodiment.

First, the inventions described in the first and second claims will be explained.

The shaped steel 1 of the invention described in the first claim has a resistance part 1 that resists bending moment by concentrating steel material at the corner part of a main body 1a having a closed rectangular cross-sectional shape as shown in FIGS.
b.

The resistance part 1b is located on the inner circumferential side of the main body 1a as shown in FIG. 1-1, or on the outer circumferential side as shown in ■, or in the middle as shown in As shown, it is formed into a circular shape or the like. V and VI are the resistance part 1b
is formed into a shape that gradually becomes thicker from the main body 1a, and the main body 1
The shape is such that force can be smoothly transmitted between the resistance part a and the resistance part lb.

As shown in Fig. 2, the section steel 1 with this cross-sectional shape resists bending moments in the For the bending moment of , as shown in ■, the total resistance part i
b and the main body 1a on both sides in the direction of application of force.

For comparison, (1) and (2) show the resistance portions of conventional box-shaped cross-section steel sections against bending moments in the X direction and X direction, respectively, by hunting. As contrasted in this figure,
Since the resistance portion 1b of the shaped steel 1 of the present invention resists in both the x and y directions, the amount of steel material is saved compared to the conventional box-shaped cross-section shaped steel that resists each in the x and y directions separately. Therefore, the wall thickness of the main body 1a of the shaped steel 1 of the present invention is thinner than that of the conventional box-shaped shaped steel.

As shown in FIG. 3, the shaped steel 1 of the invention described in the second claim has steel material concentrated at the tip of a main body 1a having an open X-shaped cross-sectional shape, and a resistance portion 1b that resists bending moment is formed there. This is what I did. (2) is the case where the resistor portion 1b is formed to have a rectangular cross section, and (2) is a case where the resistor portion 1b is formed to have a circular cross section.

As shown by the hatching in FIGS. 4-I and 4-II, the shaped steel section 1 of this shape resists bending moments in either the x or y directions through the resistance portions 1b at the four corners. Again, for comparison, the resistance portions of the cross-H-shaped cross-sectional steel sections against the bending moment in the X direction and X direction are shown by hatching in (1) and (2), respectively.

In addition, 1. In the invention described in the second claim, the resistance portion 1b is χ
, it also resists external forces in the 45° direction with respect to the y direction.

Figures 5 and 6 are respectively 1. This figure shows the procedure for manufacturing the section steel 1 according to the invention described in the second claim.

Figure 5-■ shows half of the cross section shown in Figure 1-1 as the resistance part 1b.
When the two parts are rolled together and integrated by welding (seam welding, etc.) with In the case of welding, ■ is a steel bar welded to the outside of the four corners of the rectangular steel pipe that forms the main body 1a.
This is a case in which the steel section 1 shown in Fig. 1 is produced, and both are carried out in the same manner as conventional section steel production.

Figure 6-I shows the case where the X-shaped section 1 with the resistance part 1b is manufactured directly by roll forming, and ■ is manufactured by assembling and welding the steel plate that is the main body 1a and the steel bar of the resistance part 1b. This is the case.

FIG. 7-■ shows how the finishing material 4 around the section steel 1 of the present invention is connected to equipment.

In the case of a conventional pillar with a box-shaped cross section, for example, when the finishing material 4 is applied, the outlet box 5 etc. often protrude outside the pillar shape as shown in (■), resulting in an undesirable fit in terms of design. In the present invention, these outlet boxes 5 and wiring 6. are placed inside the surface of the finishing material 4 as shown in H. It has the advantage that the piping 7 can be completely accommodated.

Next, the third. and the invention described in claim 4 will be explained.

The concrete member 3 of the present invention has a first structure as shown in FIG. Alternatively, the shaped steel 1 of the invention described in the second claim is embedded as a steel frame in concrete 2, and constitutes a structural member of a steel-framed concrete structure 1 or a steel-framed reinforced concrete structure.

The resistance portion 1b of the shaped steel 1 also functions as a main reinforcement in the concrete member 3.

In this invention, the resistance part 1 is
It is effective to add a rib lb' around b. To form the rib lb', it is sufficient to manufacture the section steel 1 by welding a steel bar with ribs.

In addition, when using the X-shaped steel frame 1 for the steel frame of the concrete member 3, compared to the case of using the conventional cross H-shaped steel frame, the members corresponding to the conventional main reinforcement and flanges are concentrated in the corner part. This has the advantage of improving workability on site.

Fig. 8 shows an example of manufacturing a concrete member 3 of one steel frame concrete structure, and Fig. 9 shows a resistance part 1b that acts as a main reinforcement.
This figure shows an example of manufacturing a concrete member 3 made of steel-framed reinforced concrete, in which shear reinforcing bars 8 are arranged around.

Next, the invention described in claim 5 will be explained.

As shown in FIG. 10, this invention uses the box-shaped section steel 1 of the first claimed invention as a column steel frame, and connects a steel beam B to this via a joining metal fitting 9 that matches the shape. It is something.

As shown in the figure, the joining hardware 9 corresponding to the shape ml includes a contact plate 9a having a groove-shaped cross section, which contacts the adjacent resistance parts lb, lb and the main body 1a simultaneously from the outside of the shaped steel 1;
As shown in FIG. 10-I, the resistance part 1b is connected to the resistance part 1b by a bolt 10 at the flange 98' of the abutment plate 9a which abuts against the resistance part 1b. That is, it is joined to the section steel 1, and to the flange of the steel beam B at the bracket l-9b by welding or the like. The joining hardware 9 is joined to the steel beam B in advance and then joined to the section steel 1 on site.

The bracket 9b of the joint hardware 9 and the flange of the steel beam B may be joined by bolts using end plates or the like.

Further, in the present invention, a female thread IC is cut at the position of the bolt 10 of the resistance portion 1b of the shaped steel 1.

The bracket 9b of the joining hardware 9 transmits the stress of the steel beam B to the web of the column, that is, the main body 1a of the section steel 1, and at the same time
It acts as a diaphragm to strengthen the joint.

FIG. 11 shows an embodiment of the invention as claimed in claim 6, in which an X-shaped section steel 1 is used as a column and connected to a steel beam B by a fitting 11 suitable for the column.

The joining hardware 11 is a contact plate 11a having a chevron-shaped cross section that contacts the main body 1a orthogonal to the section steel 1 from the outside as shown in the figure.
, and brackets 1] and b that extend vertically outward from the metal fittings 9 in the same manner as the joining metal fittings 9, and
As shown in Fig. 1-■, the contact plates 11a and lla of the joining metal fittings 11.11 facing each other with the main body 1a of the shaped steel 1 in between are joined to the shaped steel 1 by joining them with bolts 10 passing through the main body 1a. The bracket llb is connected to the flange of the steel beam B by welding or the like.

Bragen of joining hardware 11! -11b is the above-mentioned joining metal fitting 9
Similarly, the stress of the steel beam B is expressed as the main body 1a of the column, that is, the section steel 1.
At the same time, it has the role of reinforcing the joints.

FIG. 12 shows an embodiment of the invention described in claim 7, in which a steel beam B is directly joined to a column of an X-shaped section steel 1 by welding.

When joining steel beam B directly to section steel 1, see Figure 12-1.
As shown in , the web b1 of the steel beam B is the main body 1a of the section steel 1.
The flange b2 has a width that partially extends between the adjacent resistance parts 1b and 1b of the section steel 1, and the planar shape of the flange b2 is inserted into the section where the main body 1 of the section steel 1 orthogonally intersects.
It is formed in a shape that abuts against the resistance portions 1b and lb.

In this case, the shaped steel 1 and the steel beam B are joined by directly welding the flange b2 against the side surface of the shaped steel 1 as shown in the figure, but they are joined via a diaphragm having the same shape as the flange b2. You can also do that. This steel beam B
includes a bracket that is preliminarily joined to the section steel 1 of the column and located at the end of the steel beam B.

In addition, in the present invention, the joining hardware 9 in FIGS. 10 and 11
．． The role of the brackets 9b and iib of No. 11 is played by the flange b2 of the steel beam B.

FIG. 13 shows an embodiment of the invention as claimed in claim 8, in which the section steel 1 of the embodiment shown in FIG. They are butted together and directly welded together.

In the joint of this invention, the section steel 1 of the column effectively resists the applied force in the 45° direction with respect to the x and y directions, and at the same time has high bending rigidity in each of the x and y directions. It has characteristics.

In the embodiment, the adjacent resistance portions 1b, Ib and the main body]a.

1a and the upper and lower flanges b of the steel beam B
2. The diaphragm 12 is arranged at the position b2.

〔Effect of the invention〕

The present invention is as described above, and a shaped steel has a high resistance to bending because it forms a resistance part that efficiently resists bending moments by concentrating the steel material at the farthest position from its axis. The amount of steel material can be reduced compared to a section steel with the same cross-sectional dimensions.

In concrete members constructed using this shaped steel, the resistance section bears the bending force and at the same time has the function equivalent to the main reinforcement, so in the case of steel reinforced concrete construction, the arrangement of main reinforcement can be omitted or reduced. can.

In addition, at the joint with the steel beam, which is constructed using special joint hardware that matches the shape of the shaped steel, the banel dune can be reinforced at the same time by joining both sides with the joint hardware.

[Brief explanation of the drawing]

Fig. 1 - ■ - ■ are end views showing manufacturing examples of the invention described in the first claim, and Fig. 2 - - ■ and ■ are hatchings showing the resistance portions of the box-shaped cross section due to the applied force in the directions of the respective arrows. end view,
DI and IV are end views showing the conventional resistor part, FIGS. 3-I and II are end views showing a fabrication example of the invention described in the second claim, and FIGS. An end view in which the resisting portion due to the applied force in each arrow direction is shown by hatching, m and rv are end views similarly showing the conventional resisting portion, and FIGS. FIG. 6-■■ is an end view showing the procedure for manufacturing the invention according to the second claim, and FIGS. 7-I and II are the box-shaped cross-sectional shapes of the conventional and the present invention, respectively. Figure 8-I is an end view showing the finishing around the steel and connection with equipment, and IN is an end view showing an example of manufacturing a steel concrete member using the shaped steel of the present invention, Figure 9-■2 ■ 10-1 is an end view showing an example of manufacturing a steel-framed reinforced concrete member, and FIGS.
Longitudinal sectional view, FIG. 11 - ■ and ■ are respectively a transverse sectional view, a longitudinal sectional view, and FIG. 12 I showing an embodiment of the invention described in claim 6
, ■ are a cross-sectional view and a longitudinal cross-sectional view, respectively, showing an embodiment of the invention described in the seventh claim, and Fig. 13-1゜■ are a cross-sectional view and a longitudinal cross-sectional view, respectively, showing an embodiment of the invention described in the eighth claim. The plan view and FIGS. 14-1 to 14-' are end views showing a conventional section steel. 1...Shaped steel, 1a...Body, lb...
...Resistance section, lb'...Riff, 1c...
...Female thread, 2...Concrete, 3...
... Concrete member, 4 ... Finishing material, 5
・・・・・・Outlet box, 6・・・・・・Arrangement
, 7...Piping, 8...Shear reinforcement,
9... Joining hardware, 9a... Contact plate, 9
a'...Flange, 9b...Bracket, 10...Bolt, 11...Joining hardware, 11a...Abutting plate, llb ...Bracket, 12...Diaphragm, B...
...Steel beam, bl...Web, b2...
・Flange. Figure 3 ■ Figure 4 ■ [ ■ ■ ■ ■ ■ Cao ■ ■ (ib Figure Figure ■ ■ ■ I Figure ■ ■ Figure

Claims (8)

[Claims] (1) It is used in structures as a structural steel material, and the main body has a closed rectangular cross-sectional shape, with relatively thick resistance parts formed at the corners to bear the bending moment. Shaped steel. (2) It is used in structures as a structural steel material, the main body has an open X-shaped cross section, and a relatively thick resistance part is formed at the tip to bear the bending moment. Characteristic shaped steel. (3) A steel-framed concrete structure formed by embedding the shaped steel according to the first claim or the second claim in concrete;
Or a concrete member characterized in that it constitutes a structural member of steel-framed reinforced concrete construction. (4) The concrete member according to claim 3, characterized in that shear reinforcing bars are arranged around the resistance portion of the shaped steel. (5) A joint structure between a shaped steel and a steel beam according to the first claim, including a contact plate having a groove-shaped cross section that contacts the adjacent resistance portion and the main body from the outside of the shaped steel; A column-to-beam connection in which joint hardware consisting of vertically extending brackets is placed at the upper and lower flanges of a steel beam, and the contact plates are connected to the section steel with bolts, while the flanges of the steel beam are connected to the brackets. Departmental structure. (6) A joint structure between a shaped steel and a steel beam according to the second claim, which includes an abutment plate having a chevron-shaped cross section that abuts the main body orthogonal to the shaped steel from the outside, and a bracket that extends perpendicularly from the contact plate. The connecting hardware consisting of is placed at the upper and lower flanges of the steel beam, and the abutting plates of the joining hardware facing each other across the main body of the section are joined with bolts, and the flanges of the steel beam are connected to the bracket.・Beam joint structure. (7) A joint structure between a shaped steel and a steel beam according to the second claim, in which the upper and lower flanges of the shaped steel have a width spanning between adjacent resistance parts of the shaped steel and have a planar shape that butts against the orthogonal main body. A column-beam joint structure in which a steel beam is connected to a section steel directly to the side of the column or via a diaphragm of the same shape. (8) A joint structure between a shaped steel and a steel beam according to the second claim, in which the main body of the shaped steel is oriented in the axial direction of the steel beam, the steel beam is butted against the resistance part of the shaped steel, and the steel beam is joined to this side surface. The pillar that becomes
Beam joint structure.