JP2000192547A - Joining method and joining structure for column member and horizontal member in steel frame structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent brittle failure of a joining part by reinforcing a lower edge position of a beam of the stress concentrating joining part, and efficiently absorbing earthquake energy. SOLUTION: A reinforcing beam receiving piece (dead soft steel) 10 capable of receiving width directional both edge parts by an under surface of a beam 13 is fixed to a beam joining position 4 on a side surface of a column 1. The beam 13 is temporarily arranged on the column 1 while being placed on the reinforcing beam receiving piece 10. The column 1 and the beam 13 are joined, and the reinforcing beam receiving piece 10 and a lower flange 15 of the beam 13 are welded to complete joining of the column 1 and the beam 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining method and a joining structure between a column member and a horizontal member in a steel structure.

[0002]

2. Description of the Related Art In a steel structure, a column having a box-shaped cross section and a beam made of H-shaped steel are generally used in many cases. In the previous Hyogoken-Nanbu Earthquake, the fracture of the flange under the beam near the joint in such a frame-column beam became a problem, and many institutions have investigated the cause and proposed countermeasures. Beam-to-column joints include a bracket type for factory-welding columns and beams, and a field-welding type for welding beams to columns on site (including mixed joints where beam flanges are site-welded and beam webs are joined by high-strength bolts).
It is roughly divided.

[0003]

Generally, concrete and other slabs are provided on the upper part of the beam, and the upper flange is restrained from buckling, so that there is a problem that the lower flange is preceded by a tensile fracture. In the case of factory welding, the non-scallop construction method can be used to prevent the fracture of the flange from the bottom of the welding scallop as in the past, but in the case of field welding, scallop is absolutely necessary. There is a problem that stress concentration occurs in the steel and the brittle cross-sectional fracture starts.

[0004]

In the present invention, however, the above-mentioned conventional problems are solved by providing the reinforcing beam receiving piece between the lower surface of the horizontal member such as a beam and the side surface of the column.

That is, the present invention relates to a method of joining a column member and a cross member in a steel structure, and after joining an end portion of the cross member to a side surface of the column member in a predetermined manner, A reinforcing beam receiving piece is joined between both edge portions in the width direction and the side surface of the column member on the lower surface of the column member. Further, another invention is a method of joining a column member and a cross member in a steel structure, wherein the side surface of the column member and the cross member joining position are arranged in the width direction on the lower surface of the cross member. After fixing the reinforcing beam receiving piece capable of receiving both end edges and erecting the column member, a horizontal member is joined to a side surface of the column member, and the reinforcing beam receiving piece and the horizontal member are connected to each other. Is welded to the column member and the horizontal member.

In the above, there is provided an invention of a method for joining a column member and a horizontal member, each of which has a reinforcing beam receiving piece formed of two parallel plate pieces. In addition, two reinforcing beam receiving pieces are arranged in parallel.
The present invention is a method of joining a column member and a lateral member, each of which is formed by welding a support protrusion capable of contacting an inner surface of a lateral member to an inner surface of an upper end portion of the plate member. Further, a column member and a horizontal member which are formed by welding one or a plurality of parallel vertical pieces to the lower surface of a receiving plate which abuts the reinforcing beam receiving piece over the entire width of the lower surface of the joint end portion of the horizontal member. It is an invention of a method of joining with the.

In each of the above-mentioned inventions, the reinforcing beam receiving piece is desirably made of extremely mild steel.

According to the present invention, a reinforcing beam receiving piece made of extremely mild steel is fixed between a side surface of the column member and a lower surface of the horizontal member at a joint position between the column member and the horizontal member in the steel structure. A column member and a horizontal member, wherein the reinforcing beam receiving piece has a structure in which a lower surface of the horizontal member and a vertical plate material capable of supporting both widthwise edges are supported. It is a joining structure.

The column member in the above refers to a member in the vertical direction, for example, a column. In addition, the horizontal member in the above refers to a member arranged in the horizontal direction, and refers to, for example, a beam, a trunk, and the like. In addition, a remarkable effect is obtained in the case of a steel pipe mainly reinforced with a diaphragm as a column member, but a structure of an H-shaped steel or other steel materials alone or in combination is also possible. Further, as the horizontal member, a remarkable effect is obtained in the case of an H-shaped steel in which scallops for welding are formed on a web, but a horizontal member having another structure can also be used.

In the above, the mild steel is defined as the yield point (or 0.1%).
2% yield strength) of about 90 to 250 [N / mm ² ], tensile strength of about 200 to 400 [N / mm ² ], and elongation of 40 to 5
It means the one with 0 [%] or more. For example, NK-
LY100, NK-LY235, etc. By using extremely mild steel, the reinforcing beam receiving piece can be yielded prior to yielding of the beam body and the joint, and deformation of the joint and the beam can be absorbed in the case where seismic force acts. Therefore, with the same seismic force, the yielding of the joints and beams can be delayed, and the yielding of the joints and beams can be prevented even with a larger seismic force.As a result, the strength and toughness of the joints can be increased. it can.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In a factory, a side surface of a pillar 1 and a beam joining position 4 and a lower surface 15 of a lower flange 15
The reinforcing beam receiving pieces 10, 10 capable of receiving both end portions in the width direction are fixed. The reinforcing beam receiving piece 10 is made of extremely mild steel. Pillar 1 is erected at the construction site. The beam 1 is placed between the columns 1 and 1 while being placed on the reinforcing beam receiving pieces 10 and 10.
3 is provisionally set. The column 1, the web 17 of the beam 13, and the upper and lower flanges are joined. Reinforcement beam receiving pieces 10, 10 and beam 13
The lower flange 15 is welded to complete the joining of the column 1 and the beam 13.

[0012]

Embodiment 1 An embodiment of the present invention will be described with reference to FIGS.

(1) The column 1 made of a rectangular steel pipe has a so-called through-diaphragm structure in which the diaphragms 5 and 5 are interposed and welded at the beam joining positions 4 in accordance with the positions of the flanges 14 and 15 of the beams. . In addition, beam connection position 4 of column 1
To adjust the position of the web 13 of the beam 13 and the web 1
A gusset plate 7 in which bolt holes 8 are drilled in accordance with the bolt holes 18 for joining 7 is provided.

At the beam joining position 4 of the column 1, the beam 13
The reinforcing beam receiving piece 10 with its upper edge positioned is projected to match the position of the lower surface 16 of the lower flange 15. The reinforcing beam receiving piece 10 is formed of extremely mild steel and has a composition of about C 0.002% (weight) Si 0.010% Mn 0.160% P 0.013% S 0.001%. The reinforcing beam receiving piece 10 is formed with a length L, a height H, and a thickness D in the horizontal direction (the length direction of the beam) from the side surface of the column, and the structure and size of the beam to be received and the reinforcing beam receiving piece. L = 150-300m, depending on the material
m, H = 75 to 150 mm, D = 9 to 32 mm. Also, a slope 11 for welding is formed on the outer side of the upper edge of the reinforcing beam receiving piece 10 (FIG. 1A).
(C)).

(2) The beam 13 is an H-shaped steel comprising upper and lower flanges 14 and 15 and a web 17, and the web 17 is provided with bolt holes 18 and 18 for joining. Are formed with scallops (notches) 19 for welding (FIG. 1 (c)).

(3) The columns 1 and beams 13 manufactured in the factory as described above are carried into the construction site.

(4) A beam 13 is temporarily provided between the columns 1 and 1 erected at predetermined positions. At this time, the beam 13 is
0, on the lower surface 16 of the lower flange 15 of the beam 13,
The reinforcing beam receiving pieces 10, 10 are arranged along both end edges (width direction of the beam) 16a, 16a. Reinforcement beam receiving piece 1
With 0, the beam 13 can be held at a predetermined position before the bolts are tightened with the temporary alignment of the beam 13.

(5) Subsequently, the gusset plate 7 and the beam 13
A bolt is inserted between the bolt holes 8 and 18 with the web 17 to temporarily tighten the nut.

(6) After the predetermined strain relief is completed, the bolt is fully tightened. Subsequently, the upper and lower flanges 1 of the beam 13
4 and 15 and the diaphragm 5 are welded, and
The lower flange 15 and the reinforcing beam receiving piece 10 are welded.

As described above, the joining of the column 1 and the beam 13 is completed (FIGS. 1B and 3D and FIG. 3A). In the joint structure between the column 1 and the beam 13, the stress concentration at the scallop 19 is reduced by the reinforcing beam receiving piece 10, and the beam 1
3 can prevent brittle fracture of the lower flange 15.

In the above embodiment, the lower surface of the joining edge of the beam 13 where the stress is most concentrated during an earthquake
Since the reinforcing beam receiving piece 10 is fixed to the edges 16a, 16a of the lower flange 15, the joint can be efficiently reinforced with the least amount of material, but at other positions (the upper flange 14, the web 17, In addition, a reinforcing means equivalent to the reinforcing beam receiving piece 10 may be additionally provided at the center of the lower flange 15 (not shown).

In the above embodiment, the reinforcing beam receiving piece 10 has a shape in which a notch is formed at the lower end of the tip.
As long as welding can be performed between the side surface of the column 1 and the lower surface 16 of the beam 13, its shape such as a right triangle or a quarter circle is arbitrary.

In the above-described embodiment, the reinforcing beam receiving piece 10 is welded in advance at the factory. However, the reinforcing beam receiving piece 10 can be welded at a construction site before the beam.

In the above embodiment, since the reinforcing beam receiving piece 10 is fixed before the beam is erected, the beam 13 can be held at a predetermined position before welding with the column 1 or bolting, so that the workability is good. Before welding or bolting to column 1, beam 1
If means 3 for suspending or supporting the beam 3 from below are provided, the reinforcing beam receiving piece 10 can be connected to the side of the column 1 and the lower flange 15 of the beam 13 after welding the column 1 and the beam 13 or after bolting.
6 can also be welded.

In the above-described embodiment, the column 1 is a square steel pipe having a diaphragm structure. However, a square steel pipe having an inner diaphragm structure may be used (FIGS. 2 and 3).
(B)).

In this case, the column 1 is
Scallop 6 according to the position of the flanges 14 and 15 of the beam
a, 6a are formed by fitting and welding to the inner surface 3 (FIG. 3 (b)). Similarly, a gusset plate 7 having bolt holes 8 and a reinforcing beam receiving piece 10 are formed.
(FIGS. 2A and 2C). Subsequently, between the pillars 1 and 1 erected at a predetermined position on the construction site as in the above-described embodiment,
The beam 13 is temporarily installed while being placed on the reinforcing beam receiving piece 10. Subsequently, the web 17 of the gusset plate 7 and the beam 13
The bolt is inserted between the bolt holes 8 and 18 and temporarily tightened with a nut, and then fully tightened. Subsequently, the upper and lower flanges 1 of the beam 13
4, 15 and the column 1 are welded, and the lower flange 15 of the beam 13 and the reinforcing beam receiving piece 10 are welded. The joining of the column 1 and the beam 13 is completed as described above (FIG. 2).
(B), (d), FIG. 3 (b)).

Further, in the above embodiment, the column 1 is a square steel pipe, but may be a round steel pipe or other steel pipes alone or in combination (not shown).

[0028]

Embodiment 2 Another embodiment of the present invention will be described with reference to FIGS.

(1) As in the first embodiment, the diaphragm 5,
A reinforcing beam receiving piece 21 having an upper edge positioned at a beam joining position 4 of a column 1 of a rectangular steel pipe having a through-diaphragm structure to which a gusset plate 7 is welded and aligned with a lower surface 16 of a lower flange 15 of a beam 13. Projecting (Fig. 4 (a)
(C)).

The reinforcing beam receiving piece 21 is fixed to the column 1, and the substrate 2 is located outside the lower flange 15 of the beam 13.
2 and a beam 1 on the upper end of the opposing inner surface 22a of the substrate 22.
3 and a receiving piece 25 that can contact both end portions 16a of the lower surface 16 of the lower flange 15 (FIG. 6). A slope 23 for welding is formed on the inner side 22a of the upper edge of the substrates 22, 22, and a notch 2 for welding is formed on the upper portion on the base end side.
4 are formed. Further, the reinforcing beam receiving piece 21 is made of extremely mild steel as in the first embodiment. The length L, height H, and thickness D of the substrate 22 of the reinforcing beam receiving piece 21 are the same as those of the beam receiving piece 10 of the first embodiment.

(2) The pillar 1 manufactured as described above and the beam 13 processed in the same manner as in the first embodiment are carried into the construction site.

(3) As in the first embodiment, the beam 13 is temporarily provided on the reinforcing beam receiving piece 21 between the columns 1 and 1 erected at predetermined positions. Here, the lower surface 16 of the lower flange 15 of the beam 13
Then, the reinforcing beam receiving pieces 21, 21 are arranged along both end edges (beam width direction) 16a, 16a (FIGS. 4D and 5). The upper end of the inner surface 22a of the substrate 22 of the reinforcing beam receiving piece 21 and both side surfaces of the lower flange 16 of the beam 13 (the surface in the thickness direction of the lower flange) face each other. Therefore, the reinforcing beam receiving piece 21 can more reliably position the beam 13 temporarily than in the first embodiment, and can more reliably hold the beam 13 at a predetermined position before bolting.

(5) Subsequently, the gusset plate 7 and the beam 13
A bolt is inserted between the bolt holes 8 and 18 of the web 17 and the nut is temporarily tightened.

(6) After the predetermined distortion is removed, the bolt is fully tightened. Subsequently, the upper and lower flanges 1 of the beam 13
4, 15 and the diaphragms 5, 5 are welded, and the lower flange 15 of the beam 13 and the reinforcing beam receiving piece 21 are welded. Here, the lower flange 15 and the reinforcing beam receiving piece 21
Can be carried out downward, as in the first embodiment.
Work efficiency can be further improved.

The joining of the column 1 and the beam 13 is completed as described above (FIGS. 4B and 4D). In the joint structure between the column 1 and the beam 13, similarly to the first embodiment, the reinforcing beam receiving piece 21 can reduce the stress concentration at the scallop 19 and prevent the brittle fracture of the lower flange 15 of the beam 13. it can.

The column 1 in the above embodiment can be a square steel pipe having an inner diaphragm structure or another steel pipe structure (not shown), similarly to FIG. 2 and the like of the first embodiment.

The other configuration in the above embodiment is the same as that in the first embodiment.

[0038]

Embodiment 3 Another embodiment of the present invention will be described with reference to FIGS.

(1) As in the first embodiment, the diaphragm 5,
At the beam joining position 4 of the column 1 of the rectangular steel pipe having the through-diaphragm structure to which the gusset plate 7 is welded, a reinforcing beam receiving piece 27 having its upper edge positioned at the lower surface 16 of the lower flange 15 of the beam 13 is positioned. Projecting (Fig. 7 (a)
(C)).

The reinforcing beam receiving piece 27 is attached to a receiving plate 28 capable of abutting on the entire lower surface 16 of the joint portion of the lower flange 15 of the beam 13, and is fixed to the lower surface 29 of the receiving plate 28 and the side surface of the column 1. And a support projection 30. The support protrusions 30, 30 are located over the entire length L of the receiving plate 25, and are disposed on the lower surface 16 of the lower flange 15 of the beam 13 at positions along both edges (width direction of the beam) 16a, 16a. I have.
In addition, the reinforcing beam receiving piece 27 has at least the support protrusion 3.
0 is composed of extremely mild steel (FIGS. 7A and 7C).

(2) The pillar 1 manufactured as described above and the beam 13 processed in the same manner as in the first embodiment are carried into the construction site.

(3) As in the first embodiment, the beam 13 is temporarily provided on the reinforcing beam receiving piece 27 between the columns 1 and 1 erected at predetermined positions. The lower surface 16 of the lower flange 15 at the joint of the beam 13
Are arranged on the upper surface of the receiving plate 28 of the reinforcing beam receiving piece 27. The support projections 30, 30 of the reinforcing beam receiving piece 27 are formed on the lower surface 16 of the lower flange 15 at both ends (in the width direction of the beam) 16.
a, 16a. Therefore, by the reinforcing beam receiving piece 27, the position where the beam 13 is temporarily provided can be more reliably aligned than in the first and second embodiments, and the beam 13 can be surely held at a predetermined position before bolting (FIG. 7E). ).

(5) Subsequently, the gusset plate 7 and the beam 13
A bolt is inserted between the bolt holes 8 and 18 of the web 17 and the nut is temporarily tightened.

(6) After the predetermined distortion has been removed, the bolt is fully tightened. Subsequently, the lower flange 15 of the beam 13
And the supporting plate 28 of the reinforcing beam receiving piece 21 and the upper and lower flanges 14 and 15 of the beam 13 and the diaphragms 5 and 5 are welded. At this time, the receiving plate 28 serves as a backing for welding, and the welding operation can be performed efficiently.

The joining of the column 1 and the beam 13 is completed as described above (FIGS. 7B and 7D). In the joint structure of the column and the beam, the stress concentration at the scallop 19 is reduced by the reinforcing beam receiving piece 27 and the
Brittle fracture of the lower flange 15 can be prevented.

In the above embodiment, the reinforcing beam receiving piece 2
7 uses two support projections 30, but one support projection 30 may be welded to the center of the lower surface of the receiving plate 25 (FIG. 8C).

In this case, as in the previous embodiment, the pillar 1
At the beam joining position 4 of the lower surface 16 of the lower flange 15 of the beam 13
The reinforcing beam receiving piece 27 having one support protrusion 30, the gusset plate 7 with the bolt hole 8, and the reinforcing beam receiving piece 10 are protruded with the upper edge thereof positioned according to the position (FIG. 8A). (C)). Subsequently, the beam 13 is erected between the columns 1 and 1 erected at a predetermined position on the construction site in the same manner as in the above-described embodiment, while being erected on the reinforcing beam receiving piece 27 (FIG. 8E). Subsequently, a bolt is inserted between the bolt holes 8 and 18 between the gusset plate 7 and the web 17 of the beam 13 and temporarily tightened with a nut, and then fully tightened. Subsequently, the upper and lower flanges 14 and 15 of the beam 13 and the diaphragms 5 and 5 of the column 1 are welded, and the lower flange 15 of the beam 13 and the reinforcing beam receiving piece 27 are welded. Are completed (FIGS. 8B and 8D).

The support projection 30 of the reinforcing beam receiving piece 27 has two or more support projections 3 on the lower surface of the receiving plate 28.
It is also possible to configure by projecting 0 and 30 in parallel (not shown).

The column 1 in the above embodiment is a square steel pipe having an inner diaphragm structure, as in FIG.
Other steel tube structures are also possible (not shown).

Further, other configurations in the above embodiment are the same as those in the first embodiment.

[0051]

According to the present invention, a reinforcing beam receiving piece, which can be fixed to both ends in the width direction at the lower surface of the beam, is fixed to the side surface of the column member after or before joining the column and the beam. At the joint where the stress is concentrated most, there is an effect that the lower edge position of the beam can be reinforced. In addition, if the reinforcing beam receiving piece is made of extremely mild steel, the lower edge position of the beam joint can be reinforced, the seismic energy at the beam-column joint can be efficiently absorbed, and brittle fracture of the beam lower flange can be prevented. .

[Brief description of the drawings]

FIG. 1 shows a case in which a column of a through diaphragm is used in Embodiment 1 of the present invention, wherein (a) is a front view before joining,
(B) is a front view after joining, (c) is a cross-sectional view taken along line AA of (a), and (d) is a cross-sectional view taken along line BB of (b).

FIGS. 2A and 2B show a case where a pillar of an inner diaphragm is used in Embodiment 1 of the present invention, wherein FIG. 2A is a front view before joining, and FIG.
FIG. 3C is a front view after bonding, FIG. 4C is a cross-sectional view taken along line DD in FIG. 4A, and FIG. 4D is a cross-sectional view taken along line EE in FIG.

3A is a cross-sectional view taken along line CC of FIG. 1B, and FIG. 3B is a cross-sectional view taken along line FF of FIG. 2B.

4 (a) is a front view before joining, FIG. 4 (b) is a front view after joining, and FIG. 4 (c) is a GG of FIG. 4 (a).
FIG. 4D is a cross-sectional view taken along line II, and FIG. 4D is a cross-sectional view taken along line II in FIG.

FIG. 5 is an enlarged view of a portion Q in FIG. 4 (c).

FIG. 6 is an enlarged perspective view of a beam receiving piece used in Embodiment 2 of the present invention.

7 (a) is a front view before joining, FIG. 7 (b) is a front view after joining, and FIG. 7 (c) is JJ of FIG. 7 (a).
(D) is a cross-sectional view taken along line KK of (b), and (e) is a cross-sectional view taken along line MM of (b).

8 (a) is a front view before joining, FIG. 8 (b) is a front view after joining, and FIG. 8 (c) is (a) in a case where another beam receiving piece is used in Embodiment 3 of the present invention. (D) is a cross-sectional view taken along the OO line of (b), and (e) is a cross-sectional view taken along the NN line.
FIG. 3B is a cross-sectional view taken along line PP of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Column 2 Outer surface (column) 3 Inner surface (column) 4 Beam joining position (column) 5 Diaphragm (reinforcement plate) 6 Diaphragm (reinforcement plate) 7 Gusset plate 10 Reinforcement beam receiving piece (Example 1) 13 Beam 14 Upper flange ( 15) Lower flange (beam) 16 Lower surface of lower flange (beam) 16a Both end edges (beam) of lower surface of lower flange 17 Web (beam) 21 Reinforcement beam receiving piece (Example 2) 22 Board (reinforcement beam receiving piece 21) 25) Reception piece (reinforcement beam receiving piece 21) 27 Reinforcement beam receiving piece (Example 3) 28 Receiving plate (reinforcement beam receiving piece 27) 30 Support projection (reinforcement beam receiving piece 27)

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 2E125 AA04 AA14 AB01 AB16 AC15 AC16 AG03 AG04 AG12 AG32 AG41 AG45 AG47 BE10 CA05 CA90

Claims (7)

[Claims] 1. A method of joining a column member and a lateral member in a steel structure, comprising: joining an edge portion of the lateral member to a side surface of the column member in a predetermined manner; A method of joining a column member and a transverse member, wherein a reinforcing beam receiving piece is joined between both end portions in the width direction and a side surface of the column member. 2. A method for joining a column member and a lateral member in a steel structure, comprising: a lateral end of a lateral member at a joint position of the lateral member; After the reinforcing beam receiving piece capable of receiving the portion is fixed and the column member is erected, a horizontal member is joined to the side surface of the column member, and the reinforcing beam receiving piece and the horizontal member are welded. A method of joining a column member and a horizontal member, comprising: 3. The method according to claim 1, wherein the reinforcing beam receiving piece is composed of two parallel plate pieces. 4. A reinforcing plate according to claim 1, wherein the reinforcing beam receiving pieces are arranged in parallel to form two plate pieces, and support projections capable of contacting the inner surface of the horizontal member are welded to the inner surface of the upper end of the plate piece. 3. The method for joining a column member and a horizontal member according to 2. 5. The reinforcing beam receiving piece is formed by welding one or a plurality of parallel vertical pieces to the lower surface of a receiving plate abutting over the entire width of the lower surface of the joint end of the horizontal member. Or 2
The joining method of the column member and the horizontal member described in the above. 6. The method according to claim 1, wherein the reinforcing beam receiving piece is made of extremely mild steel. 7. A joint structure in which a reinforcing beam receiving piece made of extremely mild steel is fixed between a side surface of a column member and a lower surface of a transverse member at a joint position of the column member and the transverse member in a steel structure. The reinforcing beam receiving piece has a structure having a vertical plate material that can support both edges in the width direction on the lower surface of the horizontal member, and a joining structure between the column member and the horizontal member. .