JP2002266427A - Steel pedestal structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel pedestal structure for joining an H-shaped steel foundation beam to the lower end of a column by use of bolts via joint hardware, in such a manner as to make the number of the bolts as small as possible to reduce the loads of machining and assembling operations and costs while enhancing the efficiency of construction work, and increasing the bearing strength and the rigidity of the entire pedestal structure in a more stable manner. SOLUTION: In the steel pedestal structure, the vertical portion of L-shaped joint hardware at the lower flange of the H-shaped steel foundation beam is joined to the lower end of a steel column by use of high-strength bolts. The horizontal portion of the joint hardware is joined to a baseplate and the flange of the foundation beam by use of the same high-strength bolts. Using the joint hardware and the baseplate, a tensile force acting on a rectangular steel pipe column from the foundation beam via one piece of the joint hardware is converted into a compressive force acting on the steel pipe column from an opposite piece of the joint hardware.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel column base structure for joining a foundation beam to a lower end portion of a column with a high-strength bolt at the lower end of the column when constructing a steel structure building.

[0002]

2. Description of the Related Art When constructing a steel structure building, a steel column made of a square steel pipe or an H-section steel is used as a column material, and a column base, which is a lower end portion of the column, is a direct foundation type. It is fixed to a foundation such as an independent foundation type or a pile foundation type.
As a structure for fixing the steel column base to the foundation, for example, there is an invention described in JP-A-6-306943. The present invention is characterized in that a rectangular steel pipe column and a base plate are bolted together via an angle member and the base plate is fixed on a foundation with anchor bolts, but the strength and rigidity are secured as compared with a welded structure. Because of the difficulty, it has to be pin-joined, and the number of components and the number of bolts are increased, so that the efficiency of construction is reduced.

As another structure for fixing a column base, there is an invention described in Japanese Patent Application Laid-Open No. Hei 8-260478. The present invention is a steel base of a building, in which a steel skeleton installation table is placed on a steel frame provided on a steel base, and a skeleton having a steel underground beam joint is mounted thereon. However, since the number of constituent members increases, the work load of processing and assembly is large. Further, there is a problem that the distance between the steel ground and the foundation beam is large, and it is necessary to excavate the ground in a wide range and deeply, and the work load is large.

[0004]

SUMMARY OF THE INVENTION The present invention can solve the above-mentioned problems of the prior art, reduce the number of components and parts and the number of bolts as much as possible, reduce the processing and assembly work load, and save costs. It is also an object of the present invention to provide a steel column base structure capable of improving construction efficiency and stably increasing the strength and rigidity of the entire column base structure.

[0005]

The present invention provides the following (1).
To (4). (1) In a steel column base structure in which an H-shaped steel foundation beam is connected to a lower end portion of the H-shaped steel foundation beam with a high-strength bolt via a joining hardware, one side of a lower flange side of the H-shaped steel foundation beam and a lower end of the steel column. By connecting the other side of the metal joint, the axial force transmitting material and the flange of the H-beam foundation beam with high strength bolts,
A structure is provided in which a tensile force acting on a steel column from one H-shaped steel foundation beam via a metal joint is converted into a compressive force acting on the steel column from the opposite metal joint by an axial force transmitting material. A steel column base structure characterized by the following. (2) In (1), the joint on the lower flange side of the H-section steel foundation beam is an L-joint, and the vertical portion of the L-joint and the lower end of the steel column are joined by high strength bolts. A base plate serving as an axial force transmitting member is arranged on the lower surface of the horizontal portion of the L-shaped joint, and a flange of the H-shaped steel foundation beam is arranged on the upper surface of the horizontal portion of the L-shaped joint. A steel column base structure wherein the base plate and the flange of the H-shaped steel foundation beam are joined by the same high-strength bolt. (3) The steel column base structure according to (1) or (2), wherein opposed metal joints are connected by an axial force transmitting member across the steel column on the upper flange side of the H-section steel foundation beam. . (4) In (2) or (3), the base plate is bolted to the positioning plate fixed to the foundation with high-strength bolts, and the bolt hole of the base plate and the bolt hole of the positioning plate are arranged at right angles. A steel column base structure characterized by being.

[0006]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to
A steel column base structure for joining the structural steel footing beams via the joining hardware, basically, opposed joining hardware across the steel post at the lower flange side of the H-shaped steel footing beams pillar lower portion Is an L-shaped joint, a vertical portion of the L-shaped joint is bolted to a lower end of a steel column with a high-strength bolt, a base plate is provided below the horizontal portion of the L-shaped joint, and an H-shaped member is provided above the L-shaped joint. By arranging the flange of the steel foundation beam and joining with the same high strength bolt,
The opposing L-shaped joints are connected by a base plate functioning as an axial force transmitting member, and the tensile force acting on the steel column from one of the H-beam foundation beams via the L-shaped joints is applied to the opposing L-shaped joints. And a structure for converting the force into a compressive force acting on the steel column through the shaft and transmitting the compressive force to the steel column.

The present invention basically relates to a high-strength bolt friction connection between an L-shaped joint and a steel column, or an L-shaped joint and an H-shaped steel base beam and a base plate, and is required for ordinary steel processing. Processing and assembling accuracy to the extent required, and the out-of-plane tensile force acting on the steel column from the flange of one of the H-shaped steel base beams via the L-shaped metal fitting is in the plane of the L-shaped metal fitting and the base plate. Since the stress is transmitted to the steel column as a compressive force via the L-shaped joint hardware opposed to the steel column, the strength and rigidity of the entire steel column base structure can be more stably increased. . Also, by connecting the jointed metal pieces facing each other across the steel column with an axial force transmitting material on the upper flange side of the H-section steel foundation beam, the steel is converted into a compressive force through the joint metal pieces facing each other across the steel column. If the force is transmitted to the column, the strength of the entire joint structure between the steel column and the H-beam foundation beam
The rigidity can be more stably increased.

The installation area of the foundation, the shape of the positioning plate fixed to the foundation in advance, and the like are determined according to the shape of the base plate determined by the joining conditions of the H-shaped steel foundation beam to the steel column.
It is designed to ensure sufficient strength and rigidity of the column base structure as a whole. When this base plate is fixed to the foundation via the positioning plate, the bolt holes of the base plate and the bolt holes of the positioning plate are displaced due to processing accuracy and assembling work accuracy, so that high strength bolt joining cannot be performed smoothly. In some cases, it is effective to allow the bolt holes to be elongated to make the bolt holes orthogonal to each other so that the displacement of the bolt holes can be reduced.

Hereinafter, the present invention will be described more specifically. The present inventors have found that, for example, in a joint structure in which a rectangular steel tube column and an H-shaped steel beam are joined to each other with a high-strength bolt through a joint metal by using a square steel pipe for a column member and an H-shaped steel for a beam, a tensile force is applied from the joint. It has been found that the strength and rigidity of the entire joint structure can be greatly enhanced and stabilized if it is connected to the metal joint by an axial force transmitting material having high strength and rigidity. In this cross test, as shown in FIG. 1, a rectangular steel pipe column a is fixed, and H-shaped steel beams ca and cb are arranged in a cross shape on each of the corresponding surfaces via a split tee screwing. In the structure fixed by b, by applying an antisymmetric load Q (kN) to the beams ca and cb, the strength of the beams ca and cb, the strength of the bolt b of the split tee s, the out-of-plane strength of the square steel tubular column a and the like are evaluated. Is what you do.

FIG. 2 shows an example of the load Q and the deformation amount δ obtained in the cross test. JQy is the yield strength of the joint when subjected to a tensile force. For example, if the stiffness under a tensile force is about 1/6 of the stiffness under a compressive force, this structure has the same deformation δ, so that the joint receiving the tensile force and the joint receiving the compressive force The parts bear the proof stress at a ratio of 1: 6. The present invention has been made based on these findings, and is a steel column base structure for joining an H-section steel foundation beam to a steel column with a high-strength bolt via a joining hardware. As shown in FIG. 3, on the lower flanges 3b and 4b sides of the H-shaped steel foundation beams 3 and 4, the jointed metal is an L-shaped jointed metal 2a, and the vertical portion ep of the joint is made of a high-strength bolt ( (Not shown), and the lower flange 3 of the H-shaped steel base beams 3 and 4 on the upper surface of the horizontal portion fp of the L-shaped joint hardware 2a.
b, the lower surface of 4b is arranged, and the horizontal portion f of the L-shaped joint hardware 2a
The base plate 5 is disposed on the lower surface of the p-type to form an L-shaped joint metal 2
a, the lower flanges 3b, 4b of the H-shaped steel foundation beams 3, 4 and the base plate 5 are simultaneously joined with high-strength bolts (not shown), and the base plate 5 is fixed to the foundation directly or with a bolt via a positioning plate. It has a column base structure.

In this steel column base structure, the H-shaped steel foundation beam 3,
4, the lower flanges 3b, 4b are arranged on the upper surface of the horizontal portion fp of the L-shaped joint metal 2a, and the L-shaped joint metal 2a is fastened with a high-strength bolt.
By jointing the horizontal portion fp and the base plate 5 at the same time, the base plate 5 effectively functions as an axial force transmitting member, thereby realizing a column structure with high strength and rigidity. That is, (1) The tensile force from the flange of the H-shaped steel foundation beam due to the bending moment M of the H-shaped steel foundation beams 3 and 4 sandwiches the steel column 1 with the base plate 5 via the L-shaped joint hardware 2a. The joint structure is such that the L-shaped joint metal member 2a facing the steel column 1 is converted into a compressive force acting on the steel column 1 and transmitted. On the other hand, (2) H-shaped steel foundation beams 3, 4
Is transmitted to the steel column 1 by a high-strength bolt frictional connection between the metal joint on the side receiving the compressive force due to the bending moment M of the beam and the steel column 1. Here, as shown in FIG. 4, the lower flanges 3b and 4b of the H-shaped steel foundation beams 3 and 4 are arranged between the lower surface of the horizontal portion fp of the L-shaped joint hardware 2a and the base plate 5, and at the same time, the high-strength bolts are formed. Joining is also conceivable.

When the stiffness in the case of receiving the tensile force and the stiffness in the case of receiving the compressive force are equal, the force generated in each part becomes equal to that in FIG. As a method of equalizing the rigidity when receiving a tensile force and when receiving a compressive force, for example, in the case where the steel column is a square steel tube column, increasing the thickness of the end, joining the reinforcing material, It is effective to pack concrete or the like inside. However, for example, the rigidity when subjected to tensile force,
In particular, if it is about 1/6 of the stiffness under compression,
L-shaped joint hardware 2a and H-shaped steel foundation beams 3, 4 Lower flange 3
It is necessary to increase the frictional load between b and 4b slightly less than twice the structure of FIG. 3, and it is necessary to take measures to enhance the frictional force such as increasing the number of bolts, which increases the cost burden.

In the present invention, the tensile force from the flange of the H-section steel foundation beam due to the bending moment M of the H-section steel foundation beams 3 and 4 is applied to the lower flanges 3b and 4b of the H-section steel foundation beams 3 and 4 by L.
The lower flanges 3b and 4b of the H-shaped steel foundation beams 3 and 4 are disposed on the upper surface of the horizontal portion fp of the shaped metal fitting 2a and the L-shaped metal fitting 2
a, transmission is performed by joining the base plate 5 and the base plate 5 simultaneously. In the case of such a friction joining structure, particularly, a column base in which the frictional load between the lower flanges 3b and 4b of the H-shaped steel foundation beams 3 and 4 and the L-shaped joining hardware 2a is reduced and the number of bolts is reduced as much as possible. The structure can be realized. Also, an L-shaped joint is used as the joint, and the flange of the H-section steel base beam and the base plate are joined and connected to a horizontal portion of the L-shaped joint which is bolted to the steel column by a common high-strength bolt. Therefore, the increase in the number of bolts is suppressed.

In the present invention, the base plate is basically made to function also as an axial force transmitting member. Angle material or C without flange
T-shaped steel (T-shaped material), an angled material having a cutout formed by joining a plate material with an angle material, or bolting or welding the plate materials together, or a T-shaped material can be used. The axial force transmitting material in this case is to be joined to a joint metal such as a split tee or an L-shaped joint metal with a high-strength bolt sandwiching the steel column therebetween, and a straight plate portion in a cutout region of the axial force transmitting material is used. Avoid direct joining with steel columns. In the case of direct joining, the function as an axial force transmitting member is impaired.

[0015]

(Embodiment 1) Embodiment 1 of the present invention will be described below with reference to FIGS. Example 1
In the example where the positioning accuracy of the foundation is high, here,
The case where the base plate fixed to the steel column base is directly fixed to the foundation is shown. 5 and 6, reference numeral 1 denotes a square steel pipe column as a steel column.
It has a plurality of bolt holes 2h as shown in FIG.
The vertical part ep of the split tee 2b as a metal joint is joined with a high-strength bolt 6, and the lower part of the two side surfaces is shown in FIG.
The vertical portion ep of the L-shaped metal joint 2a having a plurality of bolt holes 2h as shown in FIG.

The H-shaped steel foundation beams 3 and 4 are joined by high-strength bolts 9 to the horizontal portion fp of the upper split tee 2b on the two side surfaces and to the horizontal portion fp of the L-shaped joint hardware 2a on the lower side. In this case, the upper flange 3a of the H-shaped steel foundation beams 3, 4
4a is joined to the lower surface of the horizontal portion fp of the split tee 2b, and the lower surfaces of the lower flanges 3b and 4b are joined to the upper surface of the L-shaped metal joint 2a.
A base plate 5a is simultaneously joined to the lower surface side of the shaped joint 2a so that the base plate functions as an axial force transmitting member, and the base plate 5a is joined and fixed by bolts 12 attached to the anchor member 11a. This column base structure is mainly applied when the positioning accuracy of the bolt hole 5h of the base plate 5a with respect to the bolt 12 of the anchor material 11a can be easily secured.

In the column base structure of the first embodiment, the opposite H-shaped steel base beams 3 and 4 also function as axial force transmitting members at the lower end side of the square steel tubular column 1 via the L-shaped joint 2a. Firmly and stably connected via a base plate 5a
The tensile force acting on the square steel tubular column 1 from each H-shaped steel foundation beam,
Since the base plate 5a has a structure in which the force is converted into a compressive force via the opposed L-shaped joint hardware 2a and transmitted to the square steel tubular column 1, the strength and rigidity of the column base structure as a whole can be sufficiently enhanced. . Also, in this column base structure,
The lower flanges 3b and 4b of the H-shaped steel foundation beam are arranged on the upper surface of the horizontal portion fp of the lower L-shaped joint 2a, and the base plate 5a is arranged on the lower surface of the horizontal portion fp of the L-shaped joint 2a. Simultaneous joining by the common high-strength bolt 9 makes it possible to relatively reduce the frictional force between the upper surface of the horizontal portion fp of the L-shaped joint hardware 2a and the lower surfaces of the lower flanges 3b and 4b of the H-shaped steel foundation beam. In addition, the number of bolts used can be reduced as much as possible to reduce the cost burden of the bolts and the work burden of processing and joining. In addition, since welding that requires a high level of skill and requires a large work load is not required, it is effective from the viewpoint of cost reduction and shortening of the construction period.

(Embodiment 2) A second embodiment of the present invention will be described below with reference to FIGS. Example 2
Is an example of a case the positioning accuracy of the underlying low, Here, a one in the case of fixing the base plate fixed to a steel column base to the foundation through the positioning plate. FIG.
In FIG. 9, reference numeral 1 denotes a square steel pipe column as a steel column, and a split tee 2b as a metal joint having a plurality of bolt holes 2h as shown in FIG. but are joined by high-strength bolts 6 in its vertical portion ep, 2 on the side surface bottom side of the has a plurality of bolt holes 2h as shown in FIG. 7 (b), the vertical portion e of the L-shaped joint fittings 2a
p is joined with the high-strength bolt 6.

Between the horizontal portion fp of the split tee 2b on the upper side of the two side surfaces and the horizontal portion fp of the L-shaped joint metal member 2a, H-shaped steel foundation beams 3 and 4 are joined by high-strength bolts 9, respectively. In this case, the upper flange 3a of the H-shaped steel foundation beams 3, 4
4a is joined to the lower surface of the horizontal portion fp of the split tee 2b, and the lower surfaces of the lower flanges 3b and 4b are joined to the upper surface of the L-shaped metal joint 2a.
A cross-shaped base plate 5b is provided on the lower surface side of the metal joint 2a.
At the same time with a common high-strength bolt 9 to make this base plate function as an axial force transmitting member. Then, the base plate 5b is fixed to the positioning plate 13 fixed to the anchor member 11b with the bolts 12 by joining them with the high-strength bolts 14.

As shown in FIGS. 9 (a) to 9 (c), this column base structure slightly extends between the bolt holes 13h of the base plate 5b and the bolt holes 13h of the positioning plate 13 fixed to the anchor member 11b with bolts 12. In this case, the bolt holes 13h of the positioning plate 13 and the bolt holes 5h of the base plate 5b are long holes, and are arranged so as to be orthogonal to each other so that the displacement can be reduced. In the column base structure of the second embodiment, in addition to the same operation and effect as the first embodiment, the base plate 5b with respect to the bolt hole 13h of the positioning plate 13 is provided.
The bolt holes 5h are arranged so as to be orthogonal to the long holes, so even if a slight displacement occurs between the bolt holes 13h of the positioning plate 13 and the bolt holes 5h of the base plate 5b, this displacement can be easily reduced. Thus, there is an operational effect that the joining by the high-strength bolt 14 can be performed smoothly.

(Embodiment 3) Embodiment 3 of the present invention will be described below with reference to FIGS. The third embodiment relates to a case in which a base plate fixed to a steel column base is fixed to a pile head via a positioning plate, and here, a case in which a beam is eccentrically attached to one side of a column. Show. 10 and 11, reference numeral 1 denotes a square steel pipe column as a steel column.
A vertical portion ep of a split tee 2b as a metal joint having a plurality of bolt holes 2h as shown in FIG. 7A is joined by a high-strength bolt 6, and the lower side of two side surfaces is shown in FIG. 7B. The vertical portion ep of the L-shaped metal joint 2a having the plurality of bolt holes 2h is joined with the high-strength bolt 9.

Horizontal portion fp of split tee 2b on two sides
The H-shaped steel foundation beams 3 and 4 are joined to the horizontal portion fp of the L-shaped joint hardware 2a with high-strength bolts 9 in this case. The upper surface is joined to the lower surface of the horizontal portion fp of the split tee 2b, and the lower surfaces of the lower flanges 3b and 4b are joined to the upper surface of the L-shaped joint 2a. At the same time, a cross-shaped base plate 5b is joined to the lower surface side.
This base plate is made to function as an axial force transmitting member, and this base plate 5b is fixed to a positioning plate 13a fixed to the steel pipe pile 15 by joining with high-strength bolts 14.

This column base structure is applied in a case where a slight displacement easily occurs between the bolt hole 5h of the base plate 5b and the bolt hole 13h of the positioning plate 13a fixed to the steel pipe pile 15. The bolt holes 13h of the base plate 5b and the bolt holes 5h of the base plate 5b are arranged so as to be orthogonal to each other with a long hole so that the displacement can be reduced. In the column base structure of the third embodiment, the base plate 5b is connected to the positioning plate 13 of the pile head.
The second embodiment is different from the second embodiment in that the beam is fixed to a and the beam is eccentrically mounted on one side of the column, but the same operation and effect as in the second embodiment can be obtained.

(Embodiment 4) A fourth embodiment of the present invention will be described below with reference to FIGS. The fourth embodiment is basically the same as the first to third embodiments, except that the upper metal flanges of the H-shaped steel foundation beams are joined to each other with the metal joints opposed to each other with the square steel tubular column interposed therebetween by an axial force transmitting material. , The strength and rigidity of the upper section of the H-shaped steel foundation beam are reinforced sufficiently.
Here, the case where four beams are attached is shown. Figure 1
2. In FIG. 13 and FIG. 13, reference numeral 1 denotes a rectangular steel tube column as a steel column, and a pair of upper and lower L having a plurality of bolt holes 2h as shown in FIG. The joint metal fittings 2a and 2c have high-strength bolts 6 at their vertical portions ep.
Are joined.

A pair of upper and lower L-shaped joints 2a, 2
H-section steel foundation beams 3, 4, 7, and 8 are joined to the horizontal portion fp of c by high-strength bolts 9. In this case, H-section steel foundation beams 3, 4, 7, and 8 The upper surface is joined to the lower surface of the horizontal portion fp of the upper L-shaped metal joint 2c, and the lower surface of the lower flange is joined to the upper surface of the lower L-shaped metal joint 2a. Lower L-shaped joint hardware 2
a base plate 5b having a cruciform shape is disposed on the lower surface side of the base plate a and is simultaneously joined by common high-strength bolts 9 so that the base plate functions as an axial force transmitting material. The positioning plate 13 is fixed to the embedded anchor member 11b with the high-strength bolts 12 and fixed to the positioning plate 13 with the high-strength bolts 14. The fixing structure of the H-shaped steel foundation beams 3, 4, 7, 8 on the lower flange side and the independent foundation type foundation 10b is as follows.
Since this is the same as the third embodiment, detailed description is omitted.

Reference numerals 15 and 16 denote a pair of axial force transmitting members disposed on one side on the upper side of the rectangular steel tubular column 1, and as shown in FIG. Notches, notches 20 are formed and bolt holes 1
The flanges fc and fd having 7h are formed. The axial force transmitting members 15 and 16 are disposed on both sides on the upper side with the rectangular steel tubular column 1 interposed therebetween, and the straight plate portion sp is disposed outside the upper flanges 3a and 4a of the H-shaped steel foundation beams 3 and 4, The lower surfaces of the flanges fc and fd abut against the upper surface of the horizontal plate fp of the opposing upper L-shaped joint 2a, and the upper flanges 3a and 4a of the H-shaped steel foundation beams 3 and 4 are both bolted by bolts 9 to each other. It is simultaneously joined to the horizontal plate fp of the metal joint 2a.

Reference numerals 18 and 19 denote a pair of axial force transmitting members disposed on the other side surfaces on the upper side of the square steel tubular column 1, and as shown in FIG. The flanges fe and ff having notched portions, notched portions 20 and notched portions 21 and having bolt holes 17h on both sides are formed. The axial force transmitting members 18 and 19 are disposed on opposite sides on the upper side with the rectangular steel tubular column 1 interposed therebetween, and the straight plate portion sp
Are downward, and the upper flanges 7a, 8 of the H-section steel foundation beams 7, 8
a, and the lower surfaces of the flanges fe, ff are opposed to each other, and the horizontal plate fp of the upper L-shaped metal fitting 2a on the opposite side.
Of the H-section steel base beams 7, 8
Both a and 8a are simultaneously joined to the horizontal plate fp of the L-shaped joint hardware 2a by bolts 9.

The axial force transmitting members 15, 16, 18, 19
The notch 20 forms a space that avoids interference with the L-shaped joint hardware 2c disposed on the side of the rectangular steel pipe column 1 and on both sides of the other. The notch 20 and the straight plate in the area of the notch 21 In the sp region, it is not joined to the square steel tubular column 1. In this column base structure, in addition to the same functions and effects as those of the first embodiment, the L-shaped metal joints 2c on the upper side opposed to each other with the square steel tube column interposed therebetween are connected by axial force transmitting members 15 and 16, 18 and 19. This has the effect of strengthening the strength and rigidity of the H-shaped steel foundation beams 3, 4, 7, 8 on the upper flange side, and the strength and rigidity of the steel column base structure as a whole can be more reliably strengthened. It is possible.

The present invention is not limited to the contents of the above embodiments. For example, in the embodiment, the steel column is a square steel tube column, and the case where the H-shaped steel foundation beam is joined to the two sides and the four sides is shown. However, the present invention is also applicable to the case where the H-shaped steel foundation beam is joined to the three sides. Therefore, the steel columns can be applied as H-shaped steel columns. Further, regarding the shape and arrangement of the joint hardware, base plate, positioning plate, axial force transmitting material, etc. forming the column base structure, the arrangement of the bolt holes, the basic form, etc., the steel column to be joined, the joint hardware, and the H Size, arrangement, bolt shape, size, bolt hole diameter,
Modifications may be made within the range that satisfies the claims according to the arrangement, load conditions, set strength, and the like.

[0030]

According to the present invention, in a steel column base structure in which an H-shaped steel foundation beam is connected to a lower portion of a steel column by a high-strength bolt via a metal joint and fixed to the foundation via a base plate, The tensile force acting on the steel column from the H-beam base beam flange via the L-shaped joint metal due to the in-plane stress of the base plate is converted into a compressive force via the L-shaped joint hardware opposed to the steel column. By transmitting the force to the column, the strength and rigidity of the steel column base can be more stably increased. In particular, in the present invention, H
The lower flange of the H-shaped steel foundation beam and the L-shaped joint hardware are arranged by disposing the lower flange of the H-shaped steel foundation beam on the upper surface of the horizontal part of the L-shaped joint hardware and the base plate on the lower surface of the horizontal part of the L-shaped joint hardware. Since the horizontal part and the base plate are simultaneously joined with high-strength bolts, the frictional force between the lower flange of the H-section steel base beam and the horizontal part of the L-shaped joint metal can be reduced, and the number of high-strength bolts is minimized. The processing and assembly burden can be reduced, the cost can be saved, and the construction efficiency can be improved, and the construction cost and construction period can be improved. Also,
On the upper side, the joints opposed to each other across the steel column are connected by an axial force transmitting material, and the tensile force acting on the steel column from the H-beam foundation beam flange via the joint is applied to the steel column. If the compression force is transmitted to the column as a compressive force via the metal joints opposed to each other, the strength and rigidity of the entire steel column base structure can be more reliably and stably increased. Furthermore, by making the bolt holes in the base plate and the bolt holes in the positioning plate long holes and making them orthogonal, the displacement between the bolt holes can be mitigated even if the displacement occurs due to processing accuracy or assembly accuracy. , Can make the bolt connection smooth.

[Brief description of the drawings]

FIG. 1 is an explanatory side view showing an example of a cross test method of a joint structure in which an H-shaped steel beam is joined to a square steel pipe column by high-strength bolts via a joint metal.

FIG. 2 is an explanatory diagram showing a relationship between a tensile force, a compressive force, a deformation amount, and a yield strength acting on a joint between a square steel tubular column and an H-shaped steel beam in the cross test example in FIG. 1;

FIG. 3 shows the state of generation of frictional force between the horizontal portion of the L-shaped joint hardware and the lower flange of the H-shaped steel base beam and between the horizontal portion of the L-shaped joint hardware and the base plate in the steel column base structure of the present invention. FIG.

FIG. 4 shows the generation of frictional force between the horizontal portion of the L-shaped joint hardware and the lower flange of the H-shaped steel base beam and between the lower flange of the H-shaped steel base beam and the base plate in the steel column base structure of the comparative example of the present invention. FIG.

FIG. 5 is a partially sectional side view showing an example of a steel column base structure of the present invention.

FIG. 6 is an explanatory plan view of FIG. 5;

FIG. 7A is a three-dimensional explanatory view showing a shape example of a joint metal (split tee) used to attach an H-shaped steel foundation beam upper flange to a square steel tubular column in FIGS. 5 and 6,
5B is a three-dimensional explanatory view showing an example of the shape of the L-shaped joint hardware used to attach the H-shaped steel base beam lower flange and the base plate to the square steel tubular column in FIGS. 5 and 6. FIG.

FIG. 8 is a partially sectional side view showing another example of the steel column base structure of the present invention.

9A is an explanatory plan view of FIG. 8, and FIG.
8 and 9 (a) are plan explanatory views showing a state in which an H-shaped steel foundation beam and a base plate are attached to a rectangular steel pipe column via an L-shaped joint, and (c) is a plan view of FIGS. 8 and 9 ( FIG. 3A is a plan view illustrating a positioning plate fixed to a foundation in FIG.

FIG. 10 is a partially sectional side view showing another example of the steel column base structure of the present invention.

FIG. 11 is an explanatory plan view of FIG. 10;

FIG. 12 is a partially sectional side view showing another example of the steel column base structure of the present invention.

FIG. 13 is an explanatory plan view of FIG. 12;

14A is a three-dimensional explanatory view showing an example of the shape of an L-shaped joint used to attach an H-shaped steel foundation beam to a square steel tubular column in FIGS. 12 and 13; FIGS. FIGS. 12 and 13 are three-dimensional explanatory views showing examples of the shape of an axial force transmitting member that connects the opposed L-shaped joint hardware on the upper flange side of the H-shaped steel foundation beam in FIGS.

[Explanation of symbols]

1 Square steel pipe (pillar) 2a, 2c L
Shaped joint metal 2b Split tee 2h Bolt hole ep Vertical part fp Horizontal part 3,4 H-beam foundation beam 3a, 4a Upper flange 3b, 4b Lower flange 5,5a, 5b
Base plate 5h Bolt hole 6 High strength bolt 7, 8 H-section steel foundation beam 7a, 8a Upper flange 7b, 7b Lower flange 9 High strength bolt 11a, 11b Anchor material 12 Bolt 13, 13a Positioning plate 13h Bolt hole 14 High strength bolt 15 , 16, 18, 19 Axial force transmitting material 17h Bolt hole sp Straight plate portion 20, 21 Notch fc, fd, fe, ff Flange a Column s Split tee ca, cb Beam b Bolt

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E125 AA04 AA45 AA46 AB01 AB16 AC04 AC15 AC16 AG12 AG60 BB05 BB09 BB12 BB22 BB37 BD01 BE02 BE06 BE08 BF06 CA05 CA14 EA33

Claims (4)

[Claims] In a steel column base structure in which an H-shaped steel foundation beam is bolted to a lower end portion of a column via a joining hardware, one side of a joining hardware on a lower flange side of the H-shaped steel foundation beam and a steel column are provided. the lower end portion high-strength bolts by joining, by joining the flanges of the other side and the axial force transmitting member and the H-shaped steel foundation beams joining hardware in high strength bolts, through the bonding hardware from one H-shaped steel footing beams of A steel column base structure comprising: a structure for converting a tensile force acting on a steel column into a compressive force acting on a steel column from an opposite joint metal by an axial force transmitting member. 2. The L-shaped joint metal fitting on the lower flange side of the H-section steel base beam, and a vertical portion of the L-shaped joint metal piece and a lower end of the steel column are bolted to each other with a high-strength bolt to form an L-shaped joint metal piece. A base plate serving as an axial force transmitting member is disposed on the lower surface of the horizontal portion of the above, and a flange of an H-shaped steel base beam is disposed on the upper surface of the horizontal portion of the L-shaped connecting hardware. The steel column base structure according to claim 1, wherein the flanges of the section steel foundation beam are joined by the same high-strength bolt. 3. The steel-made steel according to claim 1, wherein the metal joints on the upper flange side of the H-shaped steel foundation beam that are opposed to each other with the steel column interposed therebetween are connected by an axial force transmitting material. Pillar structure. 4. The base plate is characterized by being bolted to a positioning plate fixed to a foundation with high-strength bolts, and has a slot formed so that a bolt hole of the base plate and a bolt hole of the positioning plate are orthogonal to each other. The steel column base structure according to claim 2 or 3, wherein the steel column base structure is formed.