JP2019035255A - Junction structure of wooden member and steel member - Google Patents

Abstract

To provide a junction structure of a wooden member and a steel member in which rigidity and strength of a junction part are remarkably improved.SOLUTION: In a junction part of a wooden member 2 and a steel member 3, a base end part of a steel fitting having a flange part 112 formed on at least one of upper and lower end portions of a web part 113 is fixed to a tubular part 111 of a steel member 11. The web part 113 of the steel fitting which is made to project from the tubular part 111 of the steel member 11 is held and fixed in an insertion groove 121 formed in the wooden member 12, and the flange part 112 of the steel fitting is fixed to at least one of upper and lower end surfaces of the wooden member 12, and the wooden member 12 and the steel member 11 are joined.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a joining structure of a wooden member and a steel member applied in a roof frame or the like having a lattice shell structure of a large-scale space structure.

Conventionally, a roof structure of a large-scale space structure such as a sports hall or an event hall employs a lattice shell structure in which beam members made of many steel members are connected in a triangular or square lattice shape (patent) Reference 1).
However, in recent years, wooden members have come to be used as beam members constituting a single-layer lattice shell structure in consideration of the aesthetics, light weight, etc. of the wooden members.

However, when wooden members are used as beam members, the rigidity and proof stress of the joints are insufficient compared to the case of using conventional steel members, so the lattice shell structure buckles or deforms. easy.
Therefore, in order to solve such problems, a structure has been proposed in which a T-shaped metal fitting is interposed in the joint between the wooden member and the steel joint to improve the rigidity and proof stress of the joint (Patent Document). 2).

Japanese Patent Application Laid-Open No. 07-018742 Japanese Patent Laid-Open No. 08-060742

  However, the joint structure described in Patent Document 2 is such that the head portion of the T-shaped bracket is fixed to the outer surface of the polygonal cylindrical joint with a bolt, and the upper end surface of the wooden member and the polygonal cylindrical joint are directly connected to each other. Since these are not connected, the rigidity and proof stress of the joint between the wooden member and the steel member have not yet been sufficient.

The present invention has been made in view of such a conventional problem, and is a wooden member and a steel member that have significantly improved the rigidity and proof stress of the joint between the wooden member and the steel member. It is an object to provide a joint structure.

In order to achieve the above object, in the joining structure of a wooden member and a steel member according to the present invention, a flange portion is formed on at least one of the upper and lower ends of the web portion at the joining portion of the wooden member and the steel member Fixing the base end of the steel fitting to the steel member, and fixing the web portion of the steel fitting protruding from the steel member in an insertion groove formed in the wooden member; The flange part of the steel fitting is fixed to at least one of the upper and lower end surfaces of the wooden member, and the wooden member and the steel member are joined.

  Here, it is preferable that the web part of the steel fitting is fixed by a fastening member such as a through bolt penetrated across both side surfaces of the wooden member.

Further, it is preferable that the flange portion of the steel fitting is fixed to at least one of the upper and lower end surfaces of the wooden member by a fastening member such as a lag screw.

  Further, a fastening member such as a pulling bolt may be disposed between the steel member and the wooden member so that the wooden member is attracted toward the steel member.

The steel fitting preferably has a T-shaped or H-shaped cross-sectional shape.

The wooden member may be a beam member, and the steel member may be a joining member that joins a plurality of these beam members.

Furthermore, the steel member may also serve as a column member.

Further, the steel fitting has an H-shaped cross section, and may be formed into a dog bone shape in which the width of the flange portion is reduced in the vicinity of the steel column portion.

In the joining structure of the wooden member and the steel member according to the present invention, a flange portion is formed on at least one of the upper and lower ends of the web portion of the steel member, and the web portion is held in an insertion groove formed on the wooden member. And fixing the flange portion to at least one of the upper and lower end surfaces of the wooden member can significantly improve the rigidity and proof stress of the joint portion.

It is the perspective view of the lattice shell structure to which the joining structure of the wooden member of this invention and the steel member is applied, and the partially expanded plan view of the junction part. BRIEF DESCRIPTION OF THE DRAWINGS (A) of one Embodiment which shows the joining structure of the wooden member and steel member of this invention is a top view, (B) is side sectional drawing, (C) is a front view. (A) of other embodiment which shows the joining structure of the wooden member and steel member of this invention is a top view, (B) is side sectional drawing, (C) is a front view. (A) of other embodiment which shows the joining structure of the wooden member and steel member of this invention is a top view, (B) is side sectional drawing, (C) is a front view. (A) of other embodiment which shows the joining structure of the wooden member and steel member of this invention is a top view, (B) is side sectional drawing, (C) is a front view. (A) of other embodiment which shows the joining structure of the wooden member and steel member of this invention is a top view, (B) is side sectional drawing, (C) is a front view. (A) of other embodiment which shows the case where the flange part of a steel member is formed in dogbone shape in the joining structure of the wooden member and steel member of this invention is a top view, (B) is a front view. . It is explanatory drawing which shows the testing apparatus and implementation method in a junction part out-of-plane bending test. It is a figure which shows the relationship between the bending moment and rotation angle of each test body. It is a figure which shows the relationship between the bending moment and rotation angle of each test body.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of a joining structure between a wooden member and a steel member according to the present invention will be described in detail with reference to the drawings.

The joint structure of a wooden member and a steel member according to the present invention is particularly applied to a lattice shell structure 1 constituting a roof frame of a large-scale space structure such as a sports hall or an event hall, as shown in FIG. .
The lattice shell structure 1 shown in FIG. 1 has a structure in which a plurality of beam members 2 made of wooden members are connected in a square lattice shape, and the beam members 2 and 2 are connected to each other via a joining member 3 made of a steel member. And this invention relates to the joining structure of this wooden member and steel members.

[Embodiment 1]
FIG. 2 is an embodiment of a joining structure of a wooden member and a steel member according to the present invention. The joining member 11 is a steel member, and a flange portion 112 is fixed to the upper end of the tubular portion 111. A web portion 113 is projected on the side surface.
Therefore, when the region of the tubular portion 111 is excluded, a steel fitting having a T-shaped cross section is formed by the flange portion 112 and the web portion 113.
A plurality of insertion holes 112a are formed in the flange portion 112 at appropriate intervals, and the insertion holes 113a are formed in the web portion 113 at a substantially intermediate portion in the height direction.

On the other hand, the bowl-shaped member 12 is a wooden member, and an insertion groove 121 is formed from one end portion of the central portion in the width direction to the intermediate portion.
Further, through holes 12a are drilled from the upper end surface to a suitable depth at appropriate intervals, and through holes 12b are formed in the substantially middle portion in the height direction so as to penetrate between the side surfaces.

In order to connect the hook-shaped member 12 to the bonding member 11, the through-hole 12 b of the hook-shaped member 12 and the web portion 113 are inserted with the web portion 113 of the bonding member 11 inserted into the insertion groove 121 of the hook-shaped member 12. The hexagon bolt 14 is inserted through the insertion hole 113a, and the nut 15 is screwed to the male screw portion.
Next, when the lag screw 13 is inserted into the insertion hole 112 a of the flange portion 112 of the joining member 11 and the insertion hole 12 a of the flange-like member 12 and screwed, the flange-like member 12 can be connected to the joining member 11.
Here, the lag screw 13 is screwed up to the middle in the height direction of the bowl-shaped member 12.

[Embodiment 2]
FIG. 3 is another embodiment of a joining structure of a wooden member and a steel member according to the present invention. The joining member 21 is a steel member, and a flange portion 212 is fixed to the upper end of the tubular portion 211. A web portion 213 protrudes from the side surface.
Therefore, excluding the region of the tubular portion 211, a steel fitting having a T-shaped cross-sectional shape is formed by the flange portion 212 and the web portion 213.
The flange portion 212 has a plurality of insertion holes 212a and 212b at appropriate intervals, and the web portion 213 has an insertion hole 213a at a substantially intermediate portion in the height direction.

On the other hand, the bowl-shaped member 22 is a wooden member, and has an insertion groove 221 formed from one end portion of the central portion in the width direction to the intermediate portion.
Further, through holes 22a are formed at appropriate intervals from the upper end surface to an appropriate depth, and through holes 22b penetrating between the side surfaces are formed in a substantially intermediate portion in the height direction.

In order to connect the hook-shaped member 22 to the bonding member 21, the through-hole 22 b of the hook-shaped member 22 and the web portion 213 are inserted with the web portion 213 of the bonding member 21 inserted into the insertion groove 221 of the hook-shaped member 22. The hexagon bolt 24 is inserted through the insertion hole 213a, and the nut 25 is screwed to the male screw portion.
Next, the lag screw 23 is inserted and screwed into the insertion hole 212a of the flange portion 212 of the joining member 21 and the insertion hole 22a of the flange-shaped member 22, and the entire screw screw 26 is inserted into the insertion hole 212b of the flange portion 212. If it is screwed, the hook-shaped member 12 can be connected to the joining member 11.
Here, the lag screw 23 and the entire screw screw 26 are screwed to the middle in the height direction of the bowl-shaped member 22.

[Embodiment 3]
FIG. 4 is another embodiment of a joining structure of a wooden member and a steel member according to the present invention, wherein the joining member 31 is a steel member, and a flange portion 312 is fixed to the upper end of the tubular portion 311. A web portion 313 is projected on the side surface.
Also in this embodiment, when the region of the tubular portion 311 is excluded, a steel fitting having a T-shaped cross section is formed by the flange portion 312 and the web portion 313. However, the height of the web portion 313 is The height of the flange-shaped member 32 to be described later is approximately ½.
A plurality of insertion holes 312 a are formed in the flange portion 312 at appropriate intervals, and an insertion hole 311 a is formed in the lower end portion of the tubular portion 311.

On the other hand, the bowl-shaped member 32 is a wooden member, and has an insertion groove 321 formed from one end of the center in the width direction to the middle from the upper end in the height direction to the middle. A recessed portion 322 is formed at an intermediate portion of the portion, and a through hole 323 is bored from the recessed portion 322 to one end portion.
In addition, insertion holes 32a are formed from the upper end surface to an appropriate depth at appropriate intervals.

In order to connect the hook-shaped member 32 to the bonding member 31, the through-hole 323 of the hook-shaped member 32 and the tubular member 311 are inserted in a state where the web portion 313 of the bonding member 31 is inserted into the insertion groove 321 of the hook-shaped member 32. The pull bolt 34 is inserted through the insertion hole 311a, and the nuts 35 are screwed onto the male screw portions at both ends.
Next, when the lag screw 33 is inserted into the insertion hole 312 a of the flange portion 312 of the joining member 31 and the insertion hole 32 a of the flange-like member 32 and screwed in, the flange-like member 32 can be connected to the joining member 31.
Here, the lag screw 33 is screwed so that the tip portion thereof reaches the intermediate portion in the height direction of the bowl-shaped member 32.

[Embodiment 4]
FIG. 5 shows another embodiment of the joining structure of a wooden member and a steel member according to the present invention. The joining member 41 is a steel member, and flange portions 412 and 413 are provided at the upper and lower ends of the tubular portion 411. And a web portion 414 is projected on the side surface.
Therefore, when the region of the tubular portion 411 is excluded, a steel fitting having an H-shaped cross-sectional shape is formed by the flange portions 412 and 413 and the web portion 414.
The flange portions 412 and 413 are provided with a plurality of insertion holes 412a and 413a at appropriate intervals, and the web portion 414 is provided with an insertion hole 414a at a substantially intermediate portion in the height direction.

On the other hand, the bowl-shaped member 42 is a wooden member, and has an insertion groove 421 formed from one end of the central portion in the width direction to the intermediate portion.
Further, through holes 42a and 42b are formed at appropriate intervals from the upper end surface and the lower end surface to an appropriate depth, and a through hole 42c penetrating between the side surfaces is formed at a substantially intermediate portion in the height direction.

In order to connect the hook-shaped member 42 to the bonding member 41, the through-hole 42 c of the hook-shaped member 42 and the web portion 414 are inserted in the state where the web portion 414 of the bonding member 41 is inserted into the insertion groove 421 of the hook-shaped member 42. The hexagon bolt 44 is inserted through the insertion hole 414a, and the nut 45 is screwed to the male screw portion.
Next, the lag screw 43 is inserted and screwed into the insertion hole 412a of the flange portion 412 of the joining member 41 and the insertion hole 42a of the flange-like member 42, and the insertion hole 413a and flange-like member of the flange portion 413 of the joining member 41 are inserted. If the lag screw 43 is inserted into the insertion hole 42 b of 42 and screwed in, the flange-shaped member 42 can be connected to the joining member 41.
Here, the lag screw 43 is screwed so that the tip end portion thereof reaches the intermediate portion in the height direction of the bowl-shaped member 42.

[Embodiment 5]
As shown in FIG. 6, the joining member 51 has a flange portion 512, 513, and a flange portion 512, 513 having a width lower than that of the flange portion 512 at the upper end, and a distance between them is shortened. You may make it form the steel metal fitting which exhibits a deformation | transformation H-shaped cross-sectional shape with the web part 514. FIG.

[Embodiment 6]
Further, as shown in FIG. 7, the joining member 61 has an H-shaped cross-sectional shape, and in the vicinity of the tubular member 611, a steel fitting having a dogbone shape in which the width of the flange portion 612 decreases is formed. You may do it.

  As described above, the flange member 612 of the joining member 61 is reduced in width and plasticized prior to the wooden member 62 or the joining portion thereof, so that it is sufficient for the joining member 61 that is a steel fitting. Toughness can be imparted.

  Next, in the lattice shell structure 1 shown in FIG. 1, assuming a beam member to be applied when the span is 24 m, the rigidity and proof stress at the joint portion are examined.

[Rigidity and proof stress test]
The loading was performed by a four-point load method, and an equal bending moment was applied to the joint portion of the test body 73 via a force beam 72 attached to the Amsler testing machine 71 with the configuration shown in FIG.

  In the test body 73, the wood (glued wood) shown in Table 1 was used as the wooden member, and those shown in Table 2 were used as the steel member and the fastening member.

As the test body 73, as described above, the one configured as in Embodiments 1 to 4 was used.
Here, TB300 is Embodiment 1, the length of the web part is 300 mm, TB440 is Embodiment 1, the web part length is 440 mm, PB is Embodiment 2, BB is Embodiment 3, and HB. These are Embodiments 4 and are test bodies each having a web portion length of 300 mm.

The specimen TB300 used was a wooden member having a rectangular cross-sectional shape with a width of 150 mm, a height of 210 mm, and a length of 1520.5 mm, and an insertion groove having a width of 30 mm and a length of 310 mm.
In addition, as the steel member, the thickness of the tubular portion is 14.5 mm, the outer diameter is 159 mm, the flange portion is 9 mm thick, the width is 130 mm, the length is 300 mm, the web portion is 9 mm thick, the height is 210 mm, and the length is 300 mm. What was formed was used.

For the test body TB440, a wooden member similar to the test body TB300 was used except that the length of the insertion groove was 450 mm.
Moreover, the steel member similar to test body TB300 was used except forming in length 440mm of a flange part, and length 440mm of a web part.

The test body PB used the same wooden member and steel member as the test body TB300 as a wooden member and a steel member.

The test body BB was a wooden member similar to the test body TB300 except that the depth of the insertion groove was 110 mm and a through hole was formed from the depressed portion to one end.
Moreover, as a steel member, the steel member similar to test body TB300 was used except forming in the height of a web part of 100 mm.

The test body HB used the wooden member similar to the test body TB300 as a wooden member.
Moreover, as a steel member, the steel member similar to test body TB300 was used except a flange part being formed in the both ends of a web part.

The test results were as shown in FIGS. In the graphs shown in FIGS. 9 and 10, the vertical axis represents the bending moment M (kNm) and the horizontal axis represents the rotation angle θ (10 ⁻² × rad), and shows the relationship among the test specimens.
In addition, 1, 2, 3 (circled letters) indicate three specimen samples, and the south side and the north side indicate the arrangement part of each specimen as shown in FIG. It is.

Table 3 shows the ratio M _max / M _b to the maximum bending strength M _max and the wooden member bending strength M _b of each specimen.

Further, Table 4 shows the rotational stiffness K _θ , the dimensionless rotational stiffness κ, and the buckling load reduction coefficient β (κ) in each specimen.
Here, the method for calculating the K _theta is AIJ, and governed by the wooden structure design criteria, the calculation of the kappa and beta (kappa) are AIJ, based on Lattice Shell roof structure design criteria, Equations 1 and It was based on 2.

According to the above test results, when the joining structure of the wooden member and the steel member of the present invention is adopted, the maximum bending strength M _max is 0.34 to 0.87 times the wooden member bending strength M _b , The dimensionless rotational rigidity κ is 7.5-22.
Therefore, according to the joining structure of the wooden member and steel member of this invention, it turned out that the rigidity and proof stress in a junction part can fully be ensured.

  In the above, the case where the joining structure of the wooden member and the steel member of the present invention is applied to the lattice shell structure 1 constituting the roof frame of the large-scale space structure has been described. However, the wooden member and the steel member of the present invention are described. Of course, the joining structure can be applied to the joining structure of other wooden members and steel members.

DESCRIPTION OF SYMBOLS 1 Lattice shell structure 2 Beam member 3 Joining member 11 Joining member 111 Tubular part 112 Flange part 113 Web part 12 Gutter-like member 121 Inserting groove 13 Lag screw 14 Hexagon bolt 34 Pull bolt

Claims (8)

At the joint between the wooden member and the steel member, a base end portion of a steel fitting having a flange portion formed on at least one of the upper and lower end portions of the web portion is fixed to the steel member and protrudes from the steel member Fixing the web portion of the steel metal fitting sandwiched in an insertion groove formed in the wooden member, and fixing the flange portion of the steel metal member to at least one of the upper and lower end surfaces of the wooden member, A joining structure of a wooden member and a steel member, wherein the wooden member and the steel member are joined. 2. The wooden member and the steel member according to claim 1, wherein the web part of the steel fitting is fixed by a fastening member such as a through bolt penetrated over both side surfaces of the wooden member. Bonding structure with. The wooden member according to claim 1 or 2, wherein the flange portion of the steel fitting is fixed to at least one of upper and lower end surfaces of the wooden member by a fastening member such as a lag screw. Bonding structure with members. 4. A fastening member such as a pulling bolt is disposed between the steel member and the wooden member, and the wooden member is attracted toward the steel member. The joining structure of the wooden member and steel member as described in any one. The said steel metal fitting exhibits T-shaped or H-shaped cross-sectional shape, The joining structure of the wooden member and steel member in any one of the Claims 1 thru | or 4 characterized by the above-mentioned. The wooden member and the steel member according to any one of claims 1 to 5, wherein the wooden member is a beam member, and the steel member is a joining member that joins a plurality of these beam members. Bonding structure. The joining structure of a wooden member and a steel member according to any one of claims 1 to 6, wherein the steel member also serves as a column member. 8. The wooden member and steel according to claim 7, wherein the steel fitting has an H-shaped cross-sectional shape, and is formed into a dogbone shape in which the width of the flange portion decreases in the vicinity of the steel column portion. Bonding structure with manufactured parts.

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