JP3129685B2 - Column / beam joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint between a steel column having a closed section such as a box column (square steel pipe) and a steel beam having an upper and lower flange such as an H-section steel and a web. It is about structure.

[0002]

2. Description of the Related Art When a joint end of a steel beam made of H-section steel is joined to the side of a steel column having a closed cross section made of a square steel pipe, generally, a through-diaphragm type, an outer-diaphragm type, and A joint structure such as a diaphragm type is employed.

(1) Through-diaphragm type As shown in FIG. 20, a steel column 1 made of a rectangular steel pipe is cut at two upper and lower portions to form a joint 50.
A horizontal (through) diaphragm 51 is attached to the upper and lower surfaces of the horizontal diaphragm 51 by welding, and a steel column 1 is attached to the upper and lower surfaces of the horizontal diaphragm 51 by welding, respectively. The flanges 2a are attached to each other by welding.

(2) Outer diaphragm type As shown in FIG. 21, an outer diaphragm 60 composed of upper and lower flanges and a web is attached to the joint of the steel column 1 by welding. The outer diaphragm 60 is cut at a corner and divided into four parts.
The divided portions are attached to each other by welding, and each divided portion is attached to the side plate of the steel column 1 by welding. The steel beam 2 is bolted to the tip of the outer diaphragm 60.

(3) Inner Diaphragm Type As shown in FIG. 22, the central portion of the joint of the steel column 1 is cut horizontally, and the inner diaphragm 70 is inserted into the upper and lower steel columns 1 from the cut portion. And fix it by welding,
After that, the upper and lower steel columns 1 that were cut were fixed by welding,
The steel beam 2 is attached to the side surface of the steel column 1 by welding so that the pair of upper and lower inner diaphragms 70 and the upper and lower flanges 2a of the steel beam 2 coincide.

[0006]

However, the above-mentioned conventional joint structure has the following problems.

(1) Through-diaphragm type The horizontal diaphragm 51 is welded to the steel column 1 / joining portion 50 at four locations, the horizontal diaphragm 51 and the beam flange 2a.
Since the reliability of the proof stress of column-beam joints where there are many welding spots and many welding spots and where stress is concentrated depends on the welding technology, welding quality control is the most important point in manufacturing.
Maintain the vertical axis of the steel column 1
Including precision control for preventing misalignment of the side plates via the horizontal diaphragm 51, the number of processing steps in steel frame manufacturing increases. Since the steel column 1 and the horizontal diaphragm 51 are often welded, contraction distortion of welding occurs in the length direction of the steel column 1, and the contraction amount varies depending on the thickness of the steel column 1.
The prediction requires advanced technology based on experience.

(2) Outer diaphragm type This outer diaphragm type satisfies the mechanical function as compared with the through-diaphragm type, but in the case of corner pillars and side pillars, as shown in FIG. , Outer diaphragm 60
Since the flange portion 60a projects outward and interferes with the finishing material, it is a great restriction in building planning. FIG.
As shown in (d), the welding amount is large, such as butt welding of each divided portion of the outer diaphragm 60, welding of each divided portion to the steel column 1, and the number of processing steps involved in quality control and accuracy control of welding are as follows. According to the through diaphragm type.

(3) Inner Diaphragm Type As shown in FIG. 22 (c), the inner diaphragm 70 is welded inward from the cut surface of the steel column 1, so that workability is extremely poor. Further, when the cut surfaces of the upper and lower steel columns 1 are welded and integrated, the side plates 1a of the upper and lower steel columns 1 are likely to be misaligned due to welding distortion of the inner diaphragm 70. The inner diaphragm 70 receives a tensile force or a compressive force applied from the beam flange 2a through the side plate 1a of the steel column 1, and as shown in FIG. Since the first side plate 1a is easily broken, the inner diaphragm 70 and the beam flange 2a must be at the same level without a step. For this reason, a method such as transferring the position of the inner diaphragm 70 to the outside is adopted. However, if the prediction of the contraction due to the butt welding of the cut surface of the steel column 1 is erroneous, a step is likely to occur.

(4) Problems of plasticized region and welded portion of cold-formed square steel pipe FIG. 23 is a cross-sectional view of a cold-formed square steel pipe most frequently used for the steel column 1, and is generally used. At the corners of the cold-formed rectangular steel pipe produced by cold bending, there is a region E (hatched portion in the figure) which is significantly plasticized due to the bending in the pipe-making process.

In the conventional through-diaphragm type, outer-diaphragm type, and inner-diaphragm type described above, welding of the steel column and the diaphragm is performed in this plasticized region.

[0012] In the plasticized region of steel, the impact value of the base metal is low, and cracks and brittle fracture of the welded portion are likely to occur. Therefore, when the building receives a large external force such as seismic force or wind pressure,
There is a risk that the joint between the column and beam will collapse starting from the weld in the plasticized region. A welding technique to solve such a problem has not been established at present.

In addition to the above problems, there are the following problems in the through-diaphragm type and the inner diaphragm type in which the beam flange is directly welded. That is, in these types, butt welding is generally used,
In this case, as shown in FIG. 24, the residual stress of the welding also exists in the direction of the welding line, and when the beam flange 2a receives the tensile force, the welded portion has the direction of the tensile force and the residual stress. And a so-called multiaxial stress state in the direction of the welding line perpendicular to the tensile force to be applied, and brittle fracture is likely to occur. The collapse of the structure, which is said to be the cause, was often seen in the Northridge earthquake in the United States.To reduce the stress level of the weld, a horizontal haunch was provided at the end of the beam flange, as shown in Figs. 24 (b) and (c). As described above, measures such as providing a cover plate are taken.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to easily and rigidly join a steel column and a steel beam without using a conventional diaphragm. It is an object of the present invention to provide a joint structure of a column and a beam which can be formed.

[0015]

In order to achieve the above-mentioned object, according to the present invention, as shown in FIG. 1, upper and lower flanges and webs are provided on the side surfaces of a steel column having a closed cross section (such as a box column made of a square steel pipe). A joint structure for joining the ends of steel beams (H-section steel, I-section steel, etc.) having
In a joint structure in which steel beams are attached to one steel column at right angles to each other, such as a corner column, a side column, and a center column shown in FIG. A fixing member having a bolt member insertion hole therein is fixed in parallel with the beam longitudinal direction, and a bolt member through hole is formed in a side plate at a joint portion of the steel column in accordance with a position of the joint member. A joint end of a bolt member (bolt, deformed steel bar, or the like) inserted into the bolt member through hole and penetrating the inside of the pillar is inserted into the bolt member insertion hole of the joint metal, and a bolt member tip end projecting from the joint metal. The nut is fastened to the steel column by tightening the nut, and as shown in FIGS. 1, 3 to 8, the bolt member insertion hole is drilled in a unidirectional steel beam . Uses one-hole joint hardware consisting of a cylinder And a pair of upper and lower steel beams in the other direction
Using a two-hole joint hardware formed by integrally connecting the cylindrical parts with a joint part, the one- hole joint hardware is connected to both sides of a unidirectional steel beam.
The two-hole joint hardware is attached to both sides of the steel beam in the other direction so that the bolt member of the one- hole joint hardware passes between the pair of upper and lower bolt members. (Claim 1: Bolt penetration type).

In the column / beam joint structure, as shown in FIG. 9, the joint of the steel column is reinforced by a reinforcing plate (such as an L-shaped steel plate) from the outside or the inside, if necessary, so that the steel column is cooled. In the case of an inter-formed square steel pipe, if there is a plasticized region of steel material at the corner, the end of the reinforcing plate is welded or bolted to the steel column at a place other than the corner of the steel column (claim 2 ).

As the joining hardware, a one-hole joining hardware and a two-hole joining hardware having the following structures can be used. As shown in FIG. 1 (e), the cylindrical part is directly fixed to the side of the beam flange (one-hole joint metal). As shown in FIGS. 3 and 4, a single-hole metal fitting is formed of a cylindrical portion and a leg portion integrally projecting from the cylindrical portion, and the leg portion is fixed to a side portion of the beam flange. As shown in FIG. 5, in order to ensure the bolt-to-bolt dimension W with high accuracy, the tubular portions located on the left and right sides of the beam flange and the mounting plate portions (left and right legs) integrally connecting the left and right tubular portions are provided. The mounting plate portion is attached to the beam flange surface and fixed by welding or bolts (one-hole joint metal).

As shown in FIGS. 6 and 7, a pair of upper and lower tubular portions and a connecting portion for integrally connecting the tubular portions are fixed, and the connecting portion is fixed to a side portion of the beam flange. Or a pair of upper and lower tubular portions, a connecting portion for integrally connecting the tubular portions, and a leg portion integrally projecting from the connecting portion, and the leg portion is provided on a side portion of the beam flange. What is fixed (two-hole joint hardware). As shown in FIG. 8, a pair of upper and lower tubular portions located on the left and right sides of the beam flange and a mounting plate for integrally connecting the left and right upper and lower tubular portions so that the dimension W between the bolts can be secured with high accuracy. (In which the left and right connecting parts are integrated), and this mounting plate is attached to the beam flange surface and fixed by welding or bolts (two-hole joint hardware).

In the above column / beam joint structure, the bolt member through hole (in the case of the bolt through type) of the steel column is
As shown in FIG. 1 and FIG. 9, it is drilled near the corner of the steel column (Claim 3 ).

Further, the web at the joint end portion of the steel beam, as shown in FIG. 1, is bolted to a gusset plate fixed to the side plate at the junction of the steel columns (claim 4).

In the case of a bolt penetrating type as shown in FIG. 1, the bolt member is a rod-shaped bolt threaded at both ends,
Alternatively, use bolts with bolt heads.
5 ).

[0022] Alternatively, as shown in FIG. 10, by using the deformed steel rod to the bolt member, filling the grout or adhesive between the joining fittings (claim 6).

That is, in the present invention, (1) the conventional steel plate does not have a horizontal diaphragm. Therefore, if the steel column is a cold-bent square steel pipe,
Welding to the plasticized regions at the four corners (where cracks and brittle fracture are likely to occur) can be eliminated. As will be described later, welding to the plasticized region can be avoided even when a reinforcing plate is added to reinforce the steel column to which the joining bolt is attached.

(2) The steel column is not cut to make the column / beam joint. That is, since there is no diaphragm, it is not necessary to cut and work a steel column. Therefore, since there is no shrinkage due to welding in the length direction of the steel column, it is easy to secure dimensional accuracy.

(3) In the case of a bolt penetrating type, the joint bolt is penetrated through the steel column, the joint end is inserted through the inside of the joint of the steel beam, and a nut is attached to the tip of the joint to tighten the steel frame. Fix the steel beam on both sides or one side of the column to the steel column. Therefore, the steel column and the steel beam are welded to each other, and the column-side end face of the joint of the steel beam is crimped to the side plate of the steel column. If the upper and lower flanges of the steel beam are tightened as described above, the joint between the steel column and the steel beam is rigidly connected. In the case of outer pillars (corner pillars / side pillars), a compact column-beam joint can be obtained by simply protruding the nut or bolt head on the outside (in the case of bolt penetration type: FIG. 2).
(a)).

(4) The steel column can be commercialized only by drilling. Even if it is reinforced from the outside or the inside as required, as shown in FIG. And fillet welding, which facilitates welding work. The reinforcing plate is welded or bolted away from the plasticized areas at the four corners of the steel column. In the present invention, since the side plate of the steel column is supported by the nut or bolt head in the joint hardware or the side column, in order to secure the strength, and when inserting the joint bolt into the curved surface portion of the four corners of the bent steel column, An L-shaped steel material (for example, an angle material) as shown in FIG. 9 is reinforced so that the joining end surfaces of the joining hardware are easily adhered. In this case, since the reinforcing plate is welded or bolted to the steel column, it compensates for the cross-sectional loss of the side plate of the steel column due to the bolt holes of the joining bolt, and out-of-plane bending strength of the side plate of the steel column due to supporting pressure. To strengthen. Further, in the case of the bolt penetration type, since the joining bolt restrains the steel column in a direction orthogonal to the column cross section, for example, for a supporting force in one direction, the joining bolt in the direction orthogonal to the direction of the side plate of the steel column. Since bulging is prevented, the strength and rigidity of the joint between the column and the beam can be secured by the shape fixing effect. This operation and effect are the same even when the above-mentioned reinforcing plate is not used. The concept is as follows.

As shown in FIG. 11, the stress applied to the beam end of the column / beam joint according to the present invention is a bending moment M and a shear force Q. Now, focusing on the bending moment M and looking at the stress transmission mechanism, the tensile force T and the compressive force N concentrate on the beam end flange due to the bending moment M. In the present invention, tension is introduced into the joint bolt by tightening with the joint bolt, and the side plate of the steel column and the joint metal are crimped and are in a so-called tension joint state. Therefore, when a tensile force is applied to the beam flange, the compressive force of the crimped portion is released, and the beam flange is separated. When separated, the joint bolts are subjected to the entire tensile force, and if there is no beam on the opposite side, a nut or bolt head, if there is a beam, the end of the joint hardware and the side plate of the steel column in contact with it Support pressure is applied.

FIG. 11A shows a path through which the bending moment of the beam end is transmitted in a state where the metal fitting on the tension side and the side plate of the steel column are separated when a vertical load is applied. (A) is an elevational view at the time of a vertical load, and shows a state in which the joint bolts on the upper flange surface of the beam are tensioned and the joint bolts on the lower flange surface are compressed on the side plate surface of the steel column. (B)
Is a cross-sectional view of the upper side of the steel column, showing a state where the joining bolts are pulled together. If the left and right tensile forces are equal,
When the values are different, the difference between the left and right tensile forces is the bearing force at the end face of the joint hardware on one side. If there is no beam on one side like a side pillar, the magnitude of the bearing force is T. Then, the state follows the state shown in FIG. (C) is a cross-sectional view of the lower side of the steel column, showing a state in which the side columns of the steel column compress each other. In this case, as shown in (d), deformation occurs in which the side plate of the steel column swells in a direction perpendicular to the compressive force. In the present invention, however, the joint metal provided in the direction perpendicular to the compressive force is used. The joining bolt will restrain this bulge.

FIG. 11B shows a state where the frame receives a large lateral force due to seismic force or wind pressure. (B) is an elevational view showing the stress, (b) is a cross sectional view at the beam flange top _{surface, T 2/2 + N 2} /2 is added to the right side of the tensile force and the left compressive force on one side of the steel column 2 shows a state in which a compressive force corresponding to (1) is applied to the side plate of the steel column by the joint hardware supporting each joint bolt. (C) is a cross-sectional view of the steel column on the lower surface of the beam flange, and all apply a supporting force to one side plate surface of the steel column. Therefore, in the case of the bulging to the side due to this stress, the bulging is restricted by the bonding bolts formed by the metal fittings arranged in the orthogonal direction, as described above.

As described above, in the present invention, the tensile force applied to the joint bolt is not changed to the final state after the press-fit force between the joint hardware for fixing the joint bolt and the side plate surface of the steel column is released and separated. Is a mechanism that applies a compressive force to one side plate surface (bolt penetration type).

(5) In the case of a bolt penetrating type, when steel beams are attached at the same level in both directions of the steel column, one-way joint hardware is removed so that joint bolts penetrating the inside of the steel column do not interfere with each other. May be displaced with respect to the metal joint in the direction described above by the shaft diameter of the joint bolt or more. For example, one-way steel beams are shown in FIGS. 3, 4, and 5, and one-hole joints are shown in FIGS. 3, 4, and 5, while steel beams in other directions (directions perpendicular to the beams) are shown in FIG. 6, using a two-hole joint hardware as shown in FIG. 7 and FIG. 8, a joint bolt in one direction is located between a pair of upper and lower joint bolts in the other direction, and mutual connection of the joint bolts inside the pillar is performed. Ru it is possible to prevent the interference.

(6) In the present invention, the side plate of the steel column receives a supporting pressure from the column-side end face of the metal joint, so that the side plate receives an out-of-plane force. Therefore, it is preferable that the joint bolt be located near the corner of the steel column, since the out-of-plane bending moment of the side plate is reduced, so that rigidity is secured (the amount of dent of the side plate is reduced) (see FIGS. 14 and 19). ). For this,
The joint hardware changes the shape and length of the legs of the one-hole joint hardware,
Or by decentering the connecting part of the two-hole joint hardware,
This can be coped with by arranging the cylindrical portion of the metal joint outside the beam flange width. In this way, a metal joint is prepared so that the position of the joint bolt can be adjusted based on the relationship between the width of the beam flange and the width of the steel column. Further, the height position of the joining bolt can be similarly adjusted. In addition, the flange width direction position and the height position of the joining bolt can be adjusted by appropriately selecting the flange width and the plate thickness of the steel beam.

(7) The web of the steel beam can be transmitted to the steel column by shearing the steel beam by bolting it to the side plate of the steel column using a gusset plate or the like.

(8) As shown in FIG. 10, in place of the joining bolt, a deformed steel rod having a convex portion on the shaft portion surface is used.
It can also be fixed with a grout material or an adhesive filled between the coupler-shaped joint metal having a concave portion inside the hole and the deformed steel bar.

(9) In the present invention, since there is no diaphragm at the column / beam joint, concrete can be easily filled. When the steel column is made of steel tube concrete, not only the rigidity of the column-beam joint but also the rigidity of the steel column itself is increased, so that a highly rigid frame can be formed.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. 1 to 14 show the case of the bolt penetrating type, and FIGS. 15 to 19 show the case of the one-side bolt type. As shown in FIG. 2, the pillars of the building
Depending on the installation position, corner pillar (outer pillar) A, side pillar B, middle pillar C
FIG. 1 shows an example in which the column / beam joint structure of the present invention is applied to a side column B. In FIG. 1, the joint structure of a column and a beam according to the present invention includes a joint metal member 3 attached to both sides of an upper and lower flange 2a at a joint end of a steel beam 2 having an H-shaped cross section, and a square steel pipe. A joining bolt (high-strength bolt) 4 that penetrates the inside of the joint of the steel column 1 and penetrates the joint 3, and a joint bolt 4 that projects from the joint 3
And a gusset plate 6 attached to the side plate 1a of the steel column 1 and bolted to the web 2b at the joint end of the steel beam 2 and the like. Have been.

The metal joint 3 has a bolt hole 3a through which the end 4a of the joint bolt 4 is inserted.
Are welded to both sides of the beam in parallel with the longitudinal direction of the beam.
A side plate 1a at a joint of the steel column 1 has the joint metal 3
A bolt through-hole 1b is drilled corresponding to the position (1), and a joining bolt 4 is inserted into the bolt through-hole 1b to penetrate the inside of the pillar. When the steel beams 2 are attached to both sides of the steel column 1 with the side columns B and the middle columns C, bolts with bolt heads may be used as shown in the figure, or rod-shaped joining bolts with threads at both ends. 4 may be used, and both ends 4a may be inserted into the joint hardware 3 so that both ends are tightened. When the steel beam 2 is attached to only one side of the steel column 1 at the corner column A or the side column B, a nut 5 is attached to a tip using a joint bolt having a bolt head and tightened.

In the corner columns A, the side columns B, and the middle columns C, the steel beams 2 are mounted orthogonally to each other. When the steel beams 2 are installed at the same level, the steel columns 1 In order to avoid interference between the joining bolts 4 arranged orthogonally inside, the bolt holes 3a of one joint metal 3 are shifted from the bolt holes 3a of the other joint metal 3 by the shaft diameter of the joint bolt 4 or more. It is good. For example, as shown in FIG. 1, a one-hole joint 3-1 may be used for one steel beam 2 and a two-hole (twin) joint 3-2 may be used for the other steel beam 2 orthogonal to the one. . In this case, the joint bolt 4 of the one-hole joint 3-1 is inserted between a pair of upper and lower joint bolts 4 connected to the two-hole joint 3-2, thereby preventing the bolts from interfering with each other inside the pillar. . In addition, when inserting bolts at the construction site, it is possible to insert a sheath tube from the outside of the column in advance and fix it with the bolt holes, straddling the bolt holes facing each other, and insert the bolts using this as a guide. it can.

FIGS. 3 and 4 show a one-hole joint hardware 3.
-1, which comprises a cylindrical portion 7 having a bolt hole 3a formed therein and a leg portion 8 integrally projecting from the cylindrical portion, and the leg portion 8 is fixed to both sides of the beam flange 2a by fillet welding 9. Is done. As shown in FIGS. 3 (b) and 3 (c), the column-side end of the metal joint 3-1 protrudes from the end surfaces of the beam flange 2a and the web 2b.
At the time of joining the column and the beam, only the pillar-side end face of the joint hardware 3-1 can be surface-touched to the side plate 1a of the steel column 1. Accordingly, the column-side end surface of the steel beam 2 may be kept in a cut state, and it is possible to omit a smoothing process, a welding groove process, and the like. Also, as shown in FIG. 4, by changing the shape, the mounting angle, or the length of the leg 8, the joint metal 3-
1, that is, the height h of the joint bolt 4 from the beam flange 2a
The installation interval W in the flange width direction can be appropriately selected.

FIG. 3A shows a standard type, and the length w is determined by the bolt tightening device and the relationship between the flange width and the column width. FIG. 3 (c) shows an example in which only both ends of the cylindrical portion 7 are provided with a large surface for touching a washer, a side plate of a steel column, and the like, and the middle portion is formed in a cylindrical cross-sectional area sufficient for the bolt strength. FIG. 4 (a) is a view in which the positioning of the bolt position where the leg 8 is set to be forked is facilitated. FIG. 4 (b) shows the position of the bolt larger than that of FIG. 4 (a) to make it easier to tighten. FIG.
It is closer to the beam end by the deformation of (a). FIG. 4 (d) shows the degree of freedom in selecting the bolt position. FIG.
(e), (f), and (g) are examples in which the appropriate position for the bolt column width can be selected. The difference from Fig. 4 (d) is that (e)
In addition to the side wall fillet welding 9 shown in (f), the front and rear side wall fillet welding 9 shown in (g) is performed, whereby the length of the cylindrical portion 7 can be shortened. As shown in FIG. 5, the tubular portion 7 is integrally attached to both ends of the mounting plate portion 8 ', and the mounting plate portion 8'
May be fixed to the beam flange surface by welding 9 or bolts so that the dimension W between bolts can be secured with high accuracy.

FIGS. 6 and 7 show a two-hole metal joint 3.
-2, comprising a pair of upper and lower cylindrical portions 10, a connecting portion 11 for integrally connecting the cylindrical portions, and a leg portion 12 integrally attached to the connecting portion as necessary. The legs 12 are fillet welded 1 on both sides of the beam flange 2a.
3 is fixed. Also in this case, the column-side end of the metal joint 3-2 is projected from the end surfaces of the beam flange 2a and the web 2b. As shown in FIG. 7, by changing the shape, length, or eccentricity of the connecting portion 11 or the length of the leg portion 12, the height of the joint metal 3-2, that is, the joint bolt 4, from the beam flange 2a is increased. The height h and the installation interval W in the flange width direction can be appropriately selected.

FIG. 6A shows a standard type having a length h (= h _1).
+ H ₂ ) is determined by the dimensions of the bolt tightening device and the dimensions to avoid interference due to the intersection of the bolts inside the steel column. FIG. 6 (b) is a side view of FIG. 6 (a), and the reason why the connecting portion 11 is retracted from the end surface of the cylindrical portion 10 is to facilitate the smoothing of the end surface of the cylindrical portion 10. FIG. 6C shows the cylindrical portion 10.
In this example, the contact surface of the washer, the side plate of the steel column, and the like is increased only at both ends, and the middle has a cylindrical cross-sectional area sufficient for the bolt strength.

FIG. 7A shows an arrangement in which the connecting portion 11 is eccentric to the flange side so that the bolt position can be arranged outside the flange. FIG. 7 (b) shows the bolt position aligned with the side of the beam flange. Fig. 7 (c) shows bolts on the outside of the pillar, such as the side pillars (the side without beams, when there is no joint hardware)
When it can be tightened from the
Are made smaller, and the bolt positions are made to coincide with the side surfaces of the beam flange as in (b). FIG. 7 (d) shows the bolt position larger than the beam flange width. FIG. 7 (e) shows a configuration in which the interval between the pair of upper and lower cylindrical portions 10 is further reduced so as to be the most compact. FIG.
(f), (g), and (h) are examples in which the interval W with respect to the column width of the bolt can be freely selected. The connecting portion 11 is provided with a leg portion 12, and the leg portion 12 is attached to the side corner shown in (g). By fixing with the meat weld 13 and the front and rear fillet welds 13 shown in (h), a sufficient welding length can be ensured, and the length of the tubular portion 10 can be shortened. Also, as shown in FIG.
Are integrally attached to both ends of the mounting plate portion 12 ′ via the connecting portion 11, and the mounting plate portion 11 ′ is fixed to the beam flange surface by welding 13 or bolts, so that the dimension W between bolts can be secured with high accuracy. May be used

The joining end 4a of the joining bolt 4 is inserted into the bolt hole 3a of the joining hardware 3, and the nut 5 is attached to the tip end of the bolt member protruding from the joining hardware 3 and tightened. The steel beam 2 is fastened to the steel column 1, but the joint hardware 3 and the joint bolt 4 are installed at positions near corners of the steel column 1 to reduce the out-of-plane bending moment of the side plate 1 a of the steel column 1. Side plate 1
The deformation of a is reduced.

The steel column 1 is reinforced from the outside as necessary. As shown in FIG. 9, the reinforcing plate 20 is, for example, an L-shaped steel plate such as an angle material, and reinforces four corners or the entire circumference of the steel column 1, and also reinforces only the metal joint portion or the entire joint portion. In any case, when the steel column 1 is a cold-bent rectangular steel pipe, the steel column 1 and the reinforcing plate 20 are welded to avoid the plasticized region E at the corner of the steel column 1. Fillet welds 21 are applied to both ends of the reinforcing plate 20.

Not only the high-strength bolt 4 but also a deformed steel bar 30 or the like may be used. In this case, as shown in FIG.
A coupling metal fitting 31 of a deformed steel rod is used as a metal fitting, an external thread is cut at the tip of the deformed steel rod 30, a washer 32 and a nut 33 are attached and tightened, and one of the filling holes 34 and 35 is used. The inside is filled with a grout material 36 or an adhesive. The withdrawal strength of the steel bar is improved due to the irregularities of the deformed steel bar 30 and the joint hardware 31. Further, the bolt through hole 1b of the steel column 1 is closed with the packing material 37 as necessary. Also in this case, the joint metal member 31 can adopt the same configuration as the one-hole or two-hole joint metal member 3 shown in FIGS.

Next, the stress transmission mechanism of the conventional column / beam joint structure and the column / beam joint structure of the present invention will be described. FIG. 12 shows the case of the conventional inner diaphragm type, and FIG. 13 shows the case of the present invention. Here, attention is paid to the stress (bending moment M, shearing force Q) applied to the beam end. The transmission mechanism to the transmission will be described. It should be noted that the case where the steel beams are on both sides of the steel column can also be considered according to the following description.

In FIG. 12, the bending moment M applied to the beam end is mainly borne by the beam upper and lower flanges 2a, and is respectively borne by the tensile force T applied to the upper flange and the compression force N applied to the lower flange. The shearing force Q is directly transmitted to the steel column 1 by a high-strength bolted connection between the gusset plate 6 fixed to the steel column 1 and the beam web 2b. The tensile force T applied to the end of the beam flange is distributed in the width direction of the flange, and the distributed tensile force T is directly transmitted to the inner diaphragm 70 of the steel column 1 via the welded portions of the side plates 1a 'on both side surfaces of the steel column 1. And the distributed shearing force is applied to both side plates 1 of the steel column 1.
a ′. Therefore, the inner diaphragm 70 plays an important role in the transmission mechanism of the column / beam joint.

On the other hand, according to the present invention, the function of the column / beam joint can be satisfied without using the diaphragm and leaving the steel column 1 as a tubular body. That is, FIG.
As shown in (1), (1) a joint metal member 3 through which a joint end of a joint bolt 4 can be inserted on both sides of the upper and lower flanges 2a of the steel beam 2;
Is fixed by welding, the column-side end surface of the joint metal member 3 is brought into surface contact with the side plate 1a of the steel column 1, and the other side is finished smoothly so that the bolt head or the nut 5 can be tightened.
(2) By inserting a joint bolt 4 into a bolt through hole 1b previously drilled at a predetermined position of the joint of the steel column 1, attaching a nut 5 to a tip protruding from the outer surface of the steel column 1, and tightening it. The steel column 1 and the steel beam 2 are fixed. When the steel beam 2 is provided on both sides of the steel column 1, the two nuts 5 are used for both fastenings. Alternatively, one side is a bolt head.

(3) Regarding tensile force of flange: FIG.
As shown in (b), the tensile force T applied to the beam flange 2a
Is transmitted to the metal joints 3 on both sides by a half via a welded portion. The transmitted tensile force is transmitted from the metal joint 3 to the outer side plate 1a "by the nut 5 or the bolt head of the outer side plate 1a" through the joint bolt 4, and the outer side plate 1a ".
Receives bearing pressure. As shown in FIG. 14 (a), this bearing force is transmitted to the both side plates 1a 'by the bending strength mainly in the region L of the outer side plate 1a ". Therefore, the bending stress becomes smaller as the width of L becomes smaller. Therefore, the closer the joint hardware 3 and the joint bolt 4 are to the corners of the steel column 1, the more the effect is exhibited.
When the bending strength of the four corners of the steel column 1 is small,
Are reinforced by attaching an L-shaped reinforcing plate 20 to the corners of. Steel column 1
Is a rectangular steel pipe subjected to cold bending, the periphery of the reinforcing plate 20 is stiffened by welding while avoiding the plasticized region E at the corner (see FIG. 9).

(4) Compressive force: When compressive force N is applied, as shown in FIGS. 13 and 14 (b), the supporting metal is directly supported from the surface touching surface of the side plate 1a of the steel column 1 as shown in FIGS. The stress is transmitted to the steel column 1 and almost no stress is transmitted to the joint bolt 4. The transmission of the supporting force to the side plates 1a 'is
Outer side plate 1a ″ of steel column 1 when the tensile force is applied
The principle is the same as that for.

When the steel beam 2 is attached to the steel column 1 from four directions as in the middle column C in FIG. 2, FIG. 13 is symmetrical, and the stress transmission mechanism should be considered in the same manner as described above. Can be.

Also, a joint metal such as a split tee is used at the beam end, and a female screw member or the like is provided on the side plate of the column in contact with the metal and screwed from the outside of the column, or a bolt head is inserted inside the side plate inside the column. There is a method using a so-called one-side bolt such as a special bolt that can be formed. By using these one-side bolts and applying the metal joint according to the present invention, the stress applied to the side plate of the column is reduced by the same mechanical principle as that of the above-mentioned bolt penetration type, so that the joint efficiency can be increased. .

FIGS. 15 and 16 (a) show this one-side bolt type. FIG. 15 shows an example using a special bolt 40, and FIG. 16 (a) shows a normal bolt 41 and a female screw member 42.
This is an example using. The special bolt 40 is a bolt that can be easily tightened from only one side. For example, a molding head is mainly provided on the closed side, a bolt having an external thread cut on the tightened side, and an intermediate portion of the bolt is inserted. The sleeve consists of a sleeve and a nut attached to the male screw of the bolt. The nut is rotated with an electric wrench to pull the bolt toward the tightening side. After that, a predetermined torque is applied and tightened to introduce a predetermined tension. Such a special bolt 40 is inserted into the bolt hole 3a of the joint fitting 3 and the bolt hole 1b of the steel column 1 from the steel beam side,
After forming the locking portion 40a, it is tightened with a predetermined torque.

In the case of FIG. 16A, a substantially L-shaped female screw member 42 also serving as a reinforcing plate is fixed to the inside of the corner of the steel column 1 by welding or the like, and is formed on the female screw member 42. Screw the normal bolt 41 into the female screw hole and tighten it with a predetermined torque.

In the case of the one-side bolt type as described above, the bulging of the orthogonal side plate cannot be prevented unlike the bolt penetrating type. However, as shown in FIG. Extrusion can be prevented.
Also, as shown in FIGS. 18 and 19, when a tensile force T is applied, unlike the bolt penetration type, the side plate 1
Although an out-of-plane bending moment acts on a, as in the case of the bolt penetrating type, L becomes small, so that the out-of-plane bending moment can be reduced. The same applies when the compressive force N is applied. Furthermore, in the case of a one-side bolt, the bolt does not penetrate the inside of the steel column, and the joining bolt does not interfere with each other inside the steel column. Therefore, the type and the mounting position of the joint hardware can be freely selected. There is an advantage. Further, as shown in FIG. 16 (b), in the case of corner pillars / side pillars, there is an advantage that the bolt head does not protrude outside and does not affect the finish material.

Although the above description has been made with reference to a steel column made of a rectangular steel pipe and a steel beam made of an H-shaped steel, the present invention is not limited to this, and a joint between a steel column having a closed cross section and a steel beam having upper and lower flanges and a web is provided. Needless to say, the present invention can be applied.

[0058]

Since the present invention has the above-described configuration, the following effects can be obtained.

(1) At the joint between a steel column having a closed section and a steel beam such as an H-section steel, the joint is formed by using a joint bolt and a joint metal, so that the conventional diaphragm can be eliminated. Without cutting the steel column (the steel column can be continuous over several floors as shown in FIG. 2 (b)), the factory can be manufactured only by drilling the steel column. Therefore, it is possible to improve the product accuracy of the steel column without shrinkage due to welding as in the past,
Since only drilling is performed, the number of manufacturing steps can be significantly reduced. In addition, the appearance of the factory product of the steel column has fewer protruding parts than the conventional bracket type, so that the weight can be reduced and the transportation efficiency is good.

(2) Since a conventional diaphragm is not provided on a steel column, when a cold-formed rectangular steel pipe is used for the steel column, welding to the plasticized region by bending at four corners becomes unnecessary, and cracks in the welded portion and The problem of brittle fracture can be solved, and the reliability of the structural frame can be improved.
Further, when reinforcing a steel column, by welding the L-shaped steel material to the fillet, welding in the plasticized region can be avoided, and the welding operation becomes easy without requiring advanced technology.

(3) The joint ends of the steel beam are welded in advance at both sides of the beam flange to the joint ends of the steel beam, so that the column-side end face of the steel beam can be cut off. Only the bolt holes need to be provided. Therefore, the number of processing steps for the steel beam can be reduced.

(4) The number of connecting bolts penetrating the steel column can be set to two or one for each flange of the steel beam by selecting a metal joint, and the steel beam is perpendicular to the steel column. When mounting, the joining bolts can be prevented from interfering with each other inside the steel column. Therefore, it is possible to freely join not only when the steel beams having the same beam structure are orthogonal to the steel columns, but also when the beam structures are different. This provides design flexibility as compared to conventional diaphragm types.

(5) By tightening the joining bolts from the outside of the steel column, a rigid beam-to-column joint can be obtained, and assembling can be performed with bolts and nuts. Contribute to improvement and labor saving.

(6) By selecting the metal joint, the joint bolt can be arranged at a position near the corner of the steel column.
Out-of-plane bending stress of the side plate of the steel column can be reduced. As shown in FIGS. 14 and 19, M = T / 2 × L
(M: the sum of the moment at both ends of the side plate of the steel column and the center moment), the smaller the value of L, the smaller the value of M, that is, the out-of-plane bending moment applied to the side plate of the steel column. This is the same principle when a tensile force or a compressive force is applied. Therefore, it is possible to obtain a great effect from a mechanical point of view by selecting the metal fittings of the present invention based on moving the bonding bolts to the outside (corners) and the mounting position thereof.

(7) If a deformed steel bar or the like is used in place of the joining bolt, it is inserted into the coupler-like joining hardware and the inside is fixed with a grout material (high-strength mortar material) or an adhesive.
A rigid column-beam joint can be obtained without using a powerful tightening device as in the case of using a high-strength bolt.

(8) In a structure in which concrete is filled in the inside of a steel column, since there is no diaphragm inside, the filling property of the concrete into the inside becomes extremely good.

(9) When a two-hole joint metal is used,
Since it is attached to the side surface of the beam flange by fillet welding, it does not require advanced welding techniques compared to butt welding, and is easy to weld and easy to position. Therefore, it is easy to secure the positional accuracy of the joining bolt.

(10) In the case of using a one-hole joint metal,
It is lightweight and has good workability, and can be positioned according to the width of the column and to prevent mutual interference of the joining bolts inside the column. Moreover, since it is attached to the side surface of the beam flange by fillet welding similarly to the two-hole type, welding is easy.

(11) Generally, a building has many outer pillars (side pillars), and fastening bolts can be easily tightened from the outside. Also, for the middle pillar, it is necessary to secure the clearance between the cylindrical bolt center of the joint metal and the flange end so that it can be tightened using a wrench from either the left or right side of the pillar (in the case of bolt through bolts). Since it is possible, a skeleton can be assembled at a construction site only by tightening work.

(12) In the method using deformed steel bars, metal joints, and grouts, many results have already been obtained for sleeve joints of deformed reinforcing bars, and the reliability is high. In the present invention, since the grout material or the adhesive is injected after the metal fitting is fastened to the steel column with the nut so as to be in close contact with the steel column, the construction is facilitated.

(13) Since the metal joint is manufactured by casting or die forging, it is easy to standardize according to the joint bolt strength or shaft diameter. Accordingly, since mass production is possible, there is an advantage that the quality is easily stabilized.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an example of a bolt-through type of a joint structure between a column and a beam according to the present invention, wherein (a) is a cross-sectional view of a steel frame column, and (b) is (a).
(B), (c) is a cross section of (a), and (d) is a cross section.
(a) is a sectional view taken along the line dd, and (e) is a sectional view taken along the line ee in (a).

FIG. 2 is a joint (bolt penetration type) between a steel column and a steel beam in the present invention, (a) is a plan view, and (b) is a partial front view of a steel frame.

3 (a) is a front view, and FIGS. 3 (b) and 3 (c) are cross-sectional views taken along the line bb and cc in FIG. 3 (a).

FIG. 4 shows a one-hole joining hardware used in the present invention, wherein (a) to
(f) is a front view showing various aspects, and (g) is a side view of (f).

FIG. 5 is a front view showing another embodiment of a one-hole joint hardware used in the present invention.

6 (a) is a front view, and FIGS. 6 (b) and (c) are cross-sectional views taken along line bb and cc of FIG. 6 (a).

FIGS. 7A and 7B are two-hole joint hardware used in the present invention, and FIGS.
(g) is a front view showing various aspects, and (h) is a side view of (g).

FIG. 8 is a front view showing another embodiment of the two-hole joint hardware used in the present invention.

FIGS. 9A and 9B are a plan view and a front view showing a reinforcing plate to be attached as needed in the present invention, wherein FIGS. 9A to 9C show cases of partial reinforcement from the outside or reinforcement of the entire periphery / joint area,
(d) shows the case of partial reinforcement from inside.

FIG. 10 is a partial sectional view showing a case where a deformed steel bar is used in place of a bolt in the present invention (bolt penetration type).

FIG. 11 is an explanatory view showing a binding effect (bolt penetration type) of the joining bolt in the present invention.

12A is a front view showing a conventional stress transmission mechanism, FIG.
(b) is a plan view.

FIG. 13 is a stress transmission mechanism of the present invention (bolt penetration type).
(A) is a front view, (b) is a plan view, and (c) is a cross-sectional view.

FIG. 14 is a plan view showing an out-of-plane bending moment (bolt penetration type) of the present invention.

FIG. 15 is an example of a one-side bolt type of a column / beam joint structure according to the present invention, in which (a) is a cross-sectional view of a steel frame column;
(b) is a front view, and (c) is a sectional view of a steel beam.

FIG. 16 (a) is a cross-sectional view of a steel column showing another example of a one-side bolt type of a column / beam joint structure of the present invention, and FIG. 16 (b) is a cross-sectional view of a steel column in a one-side bolt type. It is a top view which shows the connection part of a steel beam.

FIG. 17 is an explanatory view showing the restraining effect (one side bolt type) of the joining bolt in the present invention.

18 (a) is a front view, FIG. 18 (b) is a plan view, and FIG. 18 (c) is a sectional view showing a stress transmission mechanism (one-side bolt type) of the present invention.

FIG. 19 is a plan view showing an out-of-plane bending moment (one-side bolt type) of the present invention.

20 (a) is a perspective view and FIG. 20 (b) is a longitudinal sectional view showing a conventional through-diaphragm column / beam joint structure.

21 (a) is a perspective view, FIG. 21 (b) is a longitudinal sectional view, and FIG. 21 (c) is a plan view of a diaphragm in a corner pillar / side pillar, showing a conventional outer diaphragm type column / beam joint structure. FIG. 4 is a plan view showing attachment of a diaphragm.

22 (a) is a perspective view, FIG. 22 (b) is a longitudinal sectional view, FIG. 22 (c) is a longitudinal sectional view showing attachment of a diaphragm, and FIG. 22 (d) is a longitudinal sectional view showing a conventional inner diaphragm type column / beam joint structure. FIG. 4 is a front view and a partial cross-sectional view showing a step between a beam flange and a beam flange.

FIG. 23 is a cross-sectional view showing a plasticized region of a cold-formed square steel pipe.

24 (a) is a plan view showing a residual stress, and FIGS. 24 (b) and (c) are a front view and a plan view showing a countermeasure thereof. FIG. .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Steel pillar 1a ... Side plate 1b ... Bolt through hole 2 ... Steel beam 2a ... Upper and lower flange 2b ... Web 3 ... Joint hardware 3a ... Bolt hole 4 ... Joint bolt 4a ... Joint end 5 ... Nut 6 ... Gusset plate 7 ... Cylinder Part 8: Leg part 8 ': Mounting plate part 9: Fillet welding 10 ... Cylindrical part 11: Connection part 12 ... Leg part 12' ... Mounting plate part 13: Fillet welding 20: Reinforcement plate 21: Fillet welding 30 ... Deformed steel rod 31 ... Coupling metal fitting 32 ... Washer 33 ... Nut 34 ... Filling hole 35 ... Filling hole 36 ... Grout material 37 ... Packing material 40 ... Special bolt 40a ... Locking part 41 ... Normal bolt 42 ... Female screw member

Continuation of the front page (56) References JP-A-50-144228 (JP, A) JP-A-7-216987 (JP, A) JP-A-2-167938 (JP, A) JP-A-7-224461 (JP) , A) JP-A-4-155028 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/24 E04B 1/58 508

Claims (6)

(57) [Claims] 1. A joint structure for joining an end of a steel beam having upper and lower flanges and a web to a side surface of a steel column having a closed cross section, wherein the steel beam is connected to one steel column with respect to another. In the joint structure to be installed orthogonally, a joining hardware having a bolt member insertion hole therein is fixed on both sides of the upper and lower flanges at the joining end of the steel beam in parallel with the longitudinal direction of the beam, and the steel column is joined. A bolt member through hole is formed in the side plate at the portion corresponding to the position of the joint hardware, and a joint end portion of the bolt member inserted into the bolt member through hole and penetrated through the inside of the column is bolted to the joint hardware. By inserting the nut into the member insertion hole and attaching and tightening a nut to the tip of the bolt member protruding from the joint metal, the joint metal is tightened to the steel column, and the bolt member is fixed to the steel beam in one direction.
Use a one-hole joint hardware consisting of a tube part with an insertion hole, and connect a pair of upper and lower cylinder parts to the steel beam in the other direction with a connecting part.
Using two holes joining hardware of which is formed by the body connected, the one hole
Attach the metal fittings on both sides of the steel beam in one direction.
The steel beam in the other direction such that the bolt member of the one- hole joint hardware passes between the pair of upper and lower bolt members.
A column / beam joint structure, which is attached to both sides of a column. 2. The column / beam joint structure according to claim 1 , wherein the joint of the steel column is reinforced by a reinforcing plate from outside or inside as necessary, and the steel column is formed by a cold-formed rectangular steel pipe. A joint structure between a beam and a column, characterized in that, when a plasticized region of a steel material is present at the corner, the end of the reinforcing plate is welded or bolted to the steel column at a portion other than the corner of the steel column. 3. The column / beam joint structure according to claim 1 , wherein the bolt member through hole of the steel column is
A column / beam joint structure, which is formed near a corner of a steel column. 4. The column / beam joint structure according to claim 1 , wherein the web at the joint end of the steel beam is fixed to the side plate at the joint of the steel column. Column / beam joint structure that is bolted to the gusset plate. 5. The method of claim 1, claim 2, claim 3, or
5. The pillar / beam joint structure according to claim 4 , wherein the bolt member is a rod-shaped bolt having both ends threaded or a bolt with a bolt head.
Beam joint structure. 6. The method of claim 1, claim 2, claim 3, or
The column / beam joint structure according to claim 4 , wherein the bolt member is a deformed steel bar, and a grout material or an adhesive is filled between the bolt member and the joint metal. Part structure.