Wooden pillar unit and joint structure between wooden pillar unit and steel beam

Abstract

To provide a joint structure between a wooden pillar unit and a steel beam, capable of reducing the amount of residual deformation when a building frame undergoes plastic deformation during an earthquake, and a wooden pillar unit forming the joint structure.SOLUTION: Provided is a wooden pillar unit 60 including a wooden pole 10, an upper horizontal crosspiece 20, and a lower horizontal crosspiece 30. The upper horizontal crosspiece 20 and the lower horizontal crosspiece 30 are both formed of H-shaped steel, and a first hole 24 and a second hole 34 are provided at corresponding positions on both a lower flange 23 of the upper horizontal crosspiece 20 and an upper flange 32 of the lower horizontal crosspiece 30. The wooden pillar 10 has a through hole 14 that straddles its upper end surface 11 and lower end surface 12 and communicates with the first hole 24 and the second hole 34. When a tension material 40 inserted through the through hole 14, the first hole 24 and the second hole 34 is tensioned, the wooden pillar 10 is fixed to fasteners 45, 46 abutting both the lower flange 23 and the upper flange 32, and a notch 27 is provided at a position corresponding to the fasteners 45, 46 on at least one of the upper flange 22 and the lower flange 33.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a wooden column unit and a joint structure between a wooden column unit and a steel beam. [Background technology]

[0002] The framework that constitutes a building (building framework) includes frameworks made of columns and beams of the same material, such as wooden frameworks made of wooden columns and wooden beams, and steel frameworks made of steel columns and steel beams, as well as hybrid frameworks made of wooden columns and steel beams. By using wooden columns instead of steel for both columns and beams, a building framework can be formed that has the high rigidity of steel and the various functions that wood can provide. In addition, the plastic deformation capacity of a building framework during an earthquake is higher than that of a wooden framework made of wooden columns and wooden beams.

[0003] Here, specific examples of the effects of using wood include wood being lighter than steel frames or concrete, having a high specific strength, excellent workability, high insulation properties, and moisture control properties. In addition, wood has the appearance design that natural materials have, and because it is a natural material, it has low carbon dioxide emissions and is highly effective in reducing environmental impact.

[0004] Here, Patent Document 1 proposes a column-beam joint structure consisting of a wooden column and a steel beam. Specifically, in the column, a beam load bearing part is provided toward the center from the joint end where the column comes into contact with the beam, and a part of the beam's load is transmitted to the beam load bearing part by a joint metal that joins the column and the beam, and the beam's load is supported by the joint end of the column and the beam load bearing part.

[0005] In this beam-column joint structure, a column reinforcement material made of carbon fiber is attached to the outer periphery of the column at the joint end side where it contacts the beam. Furthermore, at least one L-shaped metal joint that connects the beam and column is attached, and this L-shaped metal joint has a step so that part of the contact surface that contacts the column does not interfere with the reinforcement material. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2011-256616 A Summary of the Invention [Problem to be solved by the invention]

[0007] As described above, the column-beam joint structure (hybrid structure) consisting of wooden columns and steel beams described in Patent Document 1 has a higher plastic deformation capacity of the building frame during an earthquake than the existing wooden frame formed of wooden columns and wooden beams. Meanwhile, in the column-beam joint structure consisting of wooden columns and steel beams described in Patent Document 1, the columns and beams are joined by bolting L-shaped joint metal fittings to both the wooden columns and the steel beams. Also, in other hybrid structures, a joint structure in which the columns and beams are joined by various bolts including lag screw bolts is common. However, in such a structure in which the steel beams and wooden columns are joined by bolts, there is a problem that the residual deformation amount may be large when the building frame undergoes plastic deformation during an earthquake.

[0008] If the amount of residual deformation is large, after an earthquake, the opening and closing of various openings such as doors and windows will be prevented due to the inclination of the building's floors, etc., which will likely have a significant impact on future livability, making large-scale repairs, renovations, and maintenance necessary.

[0009] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a joint structure between a wooden column unit and a steel beam, and a wooden column unit that forms this joint structure, which can reduce the amount of residual deformation when the building frame undergoes plastic deformation during an earthquake, and a wooden column unit that forms this joint structure. [Means for solving the problem]

[0010] In order to achieve the above object, one aspect of the wooden pole unit according to the present invention is as follows: A wooden column unit having a wooden column and an upper horizontal beam and a lower horizontal beam arranged above and below the wooden column, the upper horizontal beam and the lower horizontal beam being joined to upper and lower steel beams, respectively, Both the upper cross beam and the lower cross beam are formed of H-shaped steel, A first hole and a second hole are provided at corresponding positions on both the lower flange of the upper horizontal bar and the upper flange of the lower horizontal bar, The wooden pole has an upper end surface that abuts against the lower flange of the upper horizontal rail, and a lower end surface that abuts against the upper flange of the lower horizontal rail, and a through hole that straddles the upper end surface and the lower end surface and communicates with the first hole and the second hole, the tension material inserted through the through hole, the first hole, and the second hole is fixed to a fixing device that abuts against both the lower flange of the upper horizontal bar and the upper flange of the lower horizontal bar in a tensioned state, A notch is provided in at least one of the upper flange of the upper horizontal rail and the lower flange of the lower horizontal rail at a position corresponding to the fastener.

[0011] According to this embodiment, the wooden pillar and the upper and lower cross bars arranged above and below it are joined with tensioned tension members, and the upper and lower cross bars are joined to the steel beams above and below to form a joint structure. Therefore, the plastic deformation capacity of the building frame during a major earthquake is higher than, for example, a joint structure between a wooden pillar and a wooden beam, and further, it contributes to the formation of a joint structure that can reduce the amount of residual deformation compared to a configuration in which a column and a beam are joined with bolts, such as in the column-beam joint structure that constitutes a conventional building frame.

[0012] Furthermore, by providing a notch at a position corresponding to the fastener (the fastener located on the side tensioned by the tensioning device) on at least one of the upper flange of the upper horizontal bar made of H-shaped steel and the lower flange of the lower horizontal bar, a space for tensioning the tendons can be secured and the tendons can be tensioned with a predetermined tension. This tensioning work is carried out in the factory where the wooden column units are manufactured or in the manufacturing yard at the construction site.

[0013] Here, "at least one of the upper flange of the upper horizontal bar and the lower flange of the lower horizontal bar has a notch at a position corresponding to the fastener" means that it includes both a configuration in which a notch is provided in one of the upper flange of the upper horizontal bar or the lower flange of the lower horizontal bar corresponding to one of the fasteners located on the side tensioned by the tensioning device, and a configuration in which a notch is provided in both the upper flange of the upper horizontal bar and the lower flange of the lower horizontal bar. In the latter configuration, tensioning of the tendons by the tensioning device can be performed on both the upper and lower horizontal bar sides, so that the most suitable side can be selected during tensioning work to tension the tendons.

[0014] "Wooden pillars" include not only normal wooden pillars, but also wooden wall pillars. Also, the "tension material" can be PC (Prestressed Concrete) steel bars or PC steel wires. A sheath tube may be provided inside the through hole. Furthermore, the tension material can be a bonded PC crimping material using the bonded PC crimping method, in which the tension material is crimped via grout filled inside the through hole (or sheath tube), or an unbonded PC crimping material using the unbonded PC crimping method, which does not require grout filling.

[0015] In another aspect of the wooden pole unit according to the present invention, The upper flange of the upper horizontal bar and the lower flange of the lower horizontal bar are each provided with bolt holes for bolting to upper and lower steel beams.

[0016] According to this embodiment, bolt holes are provided in the upper flange of the upper horizontal bar and the lower flange of the lower horizontal bar for bolting to the upper and lower steel beams, so that the wooden column unit and the upper and lower steel beams can be firmly joined using high-strength bolts, etc.

[0017] Another aspect of the wooden pole unit according to the present invention is as follows: The lower flange of the upper horizontal rail and the wooden pole are further joined by a fail-safe fastener, The upper flange of the lower cross rail and the wooden post are further joined by a separate fastener for fail-safe purposes.

[0018] According to this embodiment, the lower flange of the upper horizontal bar and the wooden pillar, and the upper flange of the lower horizontal bar and the wooden pillar are each joined by fail-safe fasteners in addition to the tension material. Therefore, even if the tension material breaks, etc., and the connection by the tension material is released, separation or falling off of the wooden pillar and the upper horizontal bar or the lower horizontal bar can be prevented.

[0019] In another aspect of the wooden pole unit according to the present invention, The fastener is provided at a position corresponding to the notch.

[0020] According to this aspect, since the fail-safe fastener is provided at a position corresponding to the cutout, the notch can also provide work space for fastening the fastener, which, together with the tensioning work of the tension material, greatly improves manufacturability.

[0021] In another aspect of the wooden pole unit according to the present invention, The tension member is characterized in that it is an unbonded PC crimped material.

[0022] According to this embodiment, since the tension material is an unbonded PC pressure-bonded material, it is not necessary to place a sheath tube in the through hole or to fill it with grout, and the wooden column unit can be manufactured using a pressure-bonding method that is easy to manufacture.

[0023] In another aspect of the wooden pole unit according to the present invention, The wooden pillar is a wall pillar formed from any one of a plurality of square timber units, laminated timber, solid wood, structural plywood, laminated veneer lumber, and cross-laminated timber.

[0024] According to this embodiment, the wooden column is a wall column formed from any one of a plurality of square timber units, laminated timber, solid wood, structural plywood, laminated veneer lumber, and cross-laminated timber, so that the wall column functions as a load-bearing wall even while using a wooden column. For example, by adjusting the number of square timbers or the width of LVL or CLT, a wall column with the desired rigidity (earthquake resistance) can be formed.

[0025] In addition, one aspect of the joint structure between a wooden column unit and a steel beam according to the present invention is as follows: The wooden pillar unit is disposed between the upper and lower steel beams, and the upper and lower steel beams and the wooden pillar unit are connected by bolts.

[0026] According to this embodiment, the wooden column unit of the present invention is arranged between upper and lower steel beams, and the upper and lower steel beams and the wooden column unit are bolted together using high-strength bolts or the like. As a result, the wooden column and the upper and lower cross bars arranged above and below it are joined by tensioned tension members, and the upper and lower cross bars are joined to the upper and lower steel beams. As a result, the plastic deformation capacity of the building frame in the event of a major earthquake is higher than, for example, a structure in which a wooden column is joined to a wooden beam, and further, the amount of residual deformation can be reduced compared to a form in which a column and a beam are joined by bolts, such as in the column-beam joint structure that constitutes a conventional building frame. Effect of the Invention

[0027] As can be understood from the above explanation, the wooden column unit of the present invention and the joint structure between the wooden column unit and the steel beam can reduce the amount of residual deformation when the building frame undergoes plastic deformation during an earthquake. [Brief description of the drawings]

[0028] [Figure 1] FIG. 2 is a front view of an example of a wooden pole unit according to an embodiment. [Diagram 2] 2 is a view taken along the line II-II of FIG. 1, and is a vertical cross-sectional view of the wooden pole unit taken at the position of a through-hole. [Diagram 3] 3 is a view taken in the direction of the arrow III in FIG. 1, and is a plan view of the upper flange of the upper horizontal rail as viewed from above. [Figure 4] 4 is a view taken in the direction of the arrow IV in FIG. 1, and is a plan view of the lower flange of the upper horizontal rail as viewed from above. [Diagram 5] FIG. 2 is a front view of an example of a joint structure between a wooden column unit and a steel beam according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, an example of a wooden column unit according to an embodiment and an example of a joint structure between the wooden column unit and a steel beam will be described with reference to the accompanying drawings. Note that in this specification and the drawings, substantially identical components may be designated by the same reference numerals to avoid redundant description.

[0030] [Wooden pillar unit according to the embodiment, and joint structure between wooden pillar unit and steel beam] An example of a wooden pole unit according to the embodiment and a joint structure between a wooden pole unit and a steel beam will be described with reference to Figs. 1 to 5. Fig. 1 is a front view of an example of a wooden pole unit according to the embodiment. Fig. 2 is a view taken along the line II-II in Fig. 1, which is a vertical cross-sectional view of the wooden pole unit cut at the position of the through hole. Fig. 3 is a view taken along the line III in Fig. 1, which is a plan view of the upper flange of the upper horizontal rail from above. Fig. 4 is a view taken along the line IV in Fig. 1, which is a plan view of the lower flange of the upper horizontal rail from above. Fig. 5 is a front view of an example of a joint structure between a wooden pole unit and a steel beam according to the embodiment.

[0031] As shown in Fig. 1, the wooden pillar unit 60 is a component that forms the joint structure 100 shown in Fig. 5. First, the configuration of the wooden pillar unit 60 will be described.

[0032] The wooden pole unit 60 includes a wooden pole 10 and an upper horizontal beam 20 and a lower horizontal beam 30 disposed above and below the wooden pole 10.

[0033] The wooden pillar 10 is a wall pillar, and with regard to the cross-sectional dimensions perpendicular to the axial direction of the pillar, the width t2 (see Figure 2) in the wall thickness direction (width direction) is, for example, approximately the same as or larger than the wall thickness (when the thickness of the insulation material and the exterior material is added, the width in the wall thickness direction can generally be larger than the wall thickness), and the width t1 (see Figure 1) in the direction perpendicular to the wall thickness is about two to several times the width t2, and the pillar has a rectangular cross-section with a wide wide surface 13.

[0034] The wooden pillar 10, which is a wall pillar, is formed from one of a number of square timber (log) units, laminated timber, solid wood, structural plywood, laminated veneer lumber (LVL), or cross laminated timber (CLT).

[0035] A pair of through holes 14 (four through holes 14 in total) is provided on the left and right sides of the wooden pole 10, respectively.

[0036] The upper horizontal beam 20 is formed of an H-shaped steel having a web 21, an upper flange 22, and a lower flange 23, and a first hole 24 is formed at a position corresponding to the through hole 14 when the upper horizontal beam 20 is installed on the upper end surface 11 of the wooden pole 10. In addition, reinforcing ribs 25 are welded to the left and right ends so as to straddle the web 21, the upper flange 22, and the lower flange 23.

[0037] A tension member 40 such as a PC steel rod is inserted into the through hole 14, and the upper part of the tension member 40 which passes through the first hole 24 of the upper cross bar 20 is fixed to the lower flange 23 by a fixing device 45.

[0038] The upper flange 22 has cutouts 27 at positions corresponding to the fixing devices 45 that fix the tendons 40 to the lower flange 23. In the illustrated example, as shown in the plan views of Figures 3 and 4, the fixing devices 45 of each pair of tendons 40 on the left and right sides can be seen from above through the cutouts 27.

[0039] The wooden pole unit 60 in the illustrated example introduces tension to the tension members 40 by tensioning the upper ends of the tension members 40 with tensioning devices (not shown), but there may be cases where the installation of the tensioning devices is hindered by the upper flange 22, or where sufficient space cannot be secured for tensioning work even if the tensioning devices can be installed. Therefore, by providing a notch 27 in the upper flange 22 in the area where the tensioning devices are to be installed, it is possible to ensure the installation of the tensioning devices and to perform tensioning work with good manufacturability.

[0040] As shown in Fig. 3, a plurality of bolt holes 22a are provided in the upper flange 22 of the upper horizontal bar 20 in an area other than the cutout 27, through which bolts are inserted when the upper horizontal bar 20 is bolted to an upper steel beam 70 (see Fig. 5). Similarly, a plurality of bolt holes (not shown) are provided in the lower flange 33 of the lower horizontal bar 30, through which bolts are inserted when the lower horizontal bar 20 is bolted to a lower steel beam 80 (see Fig. 5).

[0041] On the other hand, the lower horizontal beam 30 is formed of an H-shaped steel having a web 31, an upper flange 32, and a lower flange 33, and a second hole 34 is formed at a position corresponding to the through hole 14 when the lower horizontal beam 30 is abutted against the lower end surface 12 of the wooden pillar 10. In addition, reinforcing ribs 35 are welded to the left and right ends so as to straddle the web 31, the upper flange 32, and the lower flange 33.

[0042] The lower portion of the tension member 40 that is inserted through the through hole 14 and the second hole 34 of the lower horizontal bar 30 is fixed to the upper flange 32 by a fixing device 46 .

[0043] In this way, with the lower part of the tension member 40 engaged with the upper flange 32 of the lower cross bar 30 by the fixing device 46, the upper part of the tension member 40 extending upward from the first hole 24 of the lower flange 23 of the upper cross bar 20 is tensioned by a tensioning device not shown, and the unbonded PC crimping method in which the tension member is fixed to the lower flange 23 by the fixing device 45 is performed on all of the tension members 40, thereby forming a wooden column unit 60 in which the wooden column 10, upper cross bar 20, and lower cross bar 30 are integrated together by multiple tension members 40 (four in the illustrated example) in a tensioned state.

[0044] In other words, because the tendon 40 is an unbonded PC crimped material, it is not necessary to place a sheath tube in the through hole 14 or fill it with grout, and the wooden column unit 60 can be manufactured using a crimping method that is easy to manufacture.

[0045] In the wooden pole unit 60, the lower flange 23 of the upper horizontal beam 20 and the wooden pole 10, and the upper flange 32 of the lower horizontal beam 30 and the wooden pole 10 are each joined by a fail-safe fastener 50 in addition to the tension member 40.

[0046] Here, the fail-safe fastener 50 may be a bolt (including a lag screw bolt: LSB), a screw, a nail, a tenon pipe, etc., but among them, a lag screw bolt is preferable because it is easy to install and has high joining strength.

[0047] Since the upper cross bar 20 and the wooden pillar 10, and the wooden pillar 10 and the lower cross bar 30 are each connected by a fail-safe fastener 50 in addition to the tension material 40, even if the tension material 40 breaks or the like and the connection by the tension material 40 is released, separation or falling off of the wooden pillar 10 and the upper cross bar 20 or the lower cross bar 30 can be prevented.

[0048] In addition, the strength of the wooden pole 10 can be increased by strongly tensioning the tension material 40, but when high strength is not required for the wooden pole 10, there are cases where the tension material 40 is not strongly tensioned. In such a case, the frictional resistance force due to the fastening between the fixing device 45 and the lower flange 23 of the upper horizontal bar 20 or the upper flange 32 of the lower horizontal bar 30 does not increase either.

[0049] Therefore, when the horizontal force acting during an earthquake is transmitted as shear force to the steel beam 70 (see Figure 5) and, for example, the high-strength bolt 90 (see Figure 5) that joins the upper cross bar 20, and then to the fixing device 45 of the tension member 40 that connects the upper cross bar 20 and the wooden column 10, since the frictional resistance between the fixing device 45 and the lower flange 23 is small, relative slippage is likely to occur between the wooden column 10 and the upper cross bar 20, etc., and there is a risk that the shear force will not be transmitted sufficiently.

[0050] In the event of such an event, by connecting the upper cross bar 20 and the lower cross bar 30 to the wooden column 10 with a fail-safe fastener 50 that is different from the tension member 40, it becomes possible to sufficiently transmit the shear force from the upper cross bar 20, etc. to the wooden column 10 before the above-mentioned slippage occurs, and therefore the fastener 50 can also function as a shear force transmission mechanism during an earthquake.

[0051] As shown in FIG. 4, a fail-safe fastener 50 is also provided at a position corresponding to the notch 27, similar to the fixing device 45.

[0052] In this way, by providing the fail-safe fastener 50 at a position corresponding to the cutout 27, a work space for fastening the fastener 50 can also be secured in the cutout 27, and together with the tensioning work of the tension member 40, the manufacturability of the wooden column unit 60 is significantly improved.

[0053] Here, notches may also be provided in the lower flange 33 of the lower horizontal crosspiece 30 at positions corresponding to the fixing device 46 and at positions corresponding to the fail-safe fastener 50. In this embodiment, tensioning of the tension member 40 by a tensioning device (not shown) can be performed on both the upper horizontal crosspiece 20 side and the lower horizontal crosspiece 30 side, so that the preferred side can be selected during tensioning to tension the tension member 40. Furthermore, manufacturability is improved when joining the wooden post 10 and the lower horizontal crosspiece 30 with the fail-safe fastener 50.

[0054] The wooden pillar unit 60 is fabricated in a factory and transported to a construction site where a building is to be constructed, but each component may be transported to the site in a separate state and fabricated in a fabrication yard or the like on the site.

[0055] For example, a wooden column unit 60 is manufactured in a factory and transported to the site, and a connection structure 100 between the wooden column unit and the steel beam is formed by bolting the upper steel beam 70 to the upper cross bar 20 and the lower steel beam 80 to the lower cross bar 30, as shown in Figure 5.

[0056] More specifically, the lower flange 73 of the upper steel beam 70 made of an H-shaped steel having a web 71, an upper flange 72, and a lower flange 73 is abutted against the upper surface of the upper flange 22 of the upper horizontal bar 20, and high-strength bolts 90 are inserted through bolt holes 22a of the upper flange 22 and bolt holes (not shown) at corresponding positions of the lower flange 73, for bolt connection. Here, the upper steel beam 70 is provided with a reinforcing rib 75 at a position corresponding to the reinforcing rib 25 of the upper horizontal bar 20.

[0057] Additionally, upper flange 82 of lower steel beam 80 made of H-shaped steel with web 81, upper flange 82, and lower flange 83 is abutted against the underside of lower flange 33 of lower cross bar 30, and high-strength bolts 90 are inserted through bolt holes (not shown) in lower flange 33 and bolt holes (not shown) at corresponding positions in upper flange 82 to form bolt connection, thereby forming connection structure 100. Here, lower steel beam 80 is provided with reinforcing rib 85 at a position corresponding to reinforcing rib 35 of lower cross bar 30.

[0058] According to the illustrated example of the joint structure 100 between the wooden column unit and the steel beam, the wooden column unit 60 is disposed between the upper and lower steel beams 70, 80, and the upper and lower steel beams 70, 80 and the wooden column unit 60 are bolted together with high-strength bolts 90. The wooden column 10 and the upper and lower cross bars 20 and lower cross bars 30 are connected together with tensioned tension members 40, and the upper and lower cross bars 20 and lower cross bars 30 are connected together with the upper and lower steel beams 70, 80. This increases the plastic deformation capacity of the building frame in a large earthquake compared to, for example, a joint structure between a wooden column and a wooden beam. Furthermore, the residual deformation can be reduced compared to a conventional joint structure between a column and a beam that constitutes a building frame, in which the column and the beam are connected together with bolts.

[0059] In addition, the present invention is not limited to the configuration shown here, and may be implemented in other embodiments in which other components are combined with the configurations and the like of the above-mentioned embodiment. In this regard, the present invention may be modified within the scope of the gist of the present invention, and may be appropriately determined according to the application form. [Explanation of symbols]

[0060] 10: Wooden pillar 11:Top end surface 12: Bottom end surface 13: Wide surface 14:Through hole 20: Upper horizontal bar (H-shaped steel) 21: Web 22: Upper flange 22a: Bolt hole 23: Lower flange 24: 1st hole 25: Reinforcement rib 27:Notch 30: Lower horizontal bar (H-shaped steel) 31: Web 32: Top flange 33: Lower flange 34:Second hole 35: Reinforcement rib 40: Tensile material 45, 46: Fixture 50:Fail-safe fasteners (fasteners, lag screws, bolts) 60: Wooden pillar unit 70: Upper steel beam (steel beam) 71: Web 72: Top flange 73: Lower flange 75: Reinforcement rib 80: Lower steel beam (steel beam) 81: Web 82: Top flange 83: Lower flange 85: Reinforcement rib 90: High strength bolts 100: Joint structure between wooden column unit and steel beam (joint structure)

Claims

1. A wooden column unit having a wooden column and an upper horizontal beam and a lower horizontal beam arranged above and below the wooden column, the upper horizontal beam and the lower horizontal beam being joined to upper and lower steel beams, respectively, Both the upper horizontal beam and the lower horizontal beam are formed of H-shaped steel, A first hole and a second hole are provided at corresponding positions on both the lower flange of the upper horizontal beam and the upper flange of the lower horizontal beam, The wooden pole has an upper end surface that abuts against the lower flange of the upper horizontal rail, and a lower end surface that abuts against the upper flange of the lower horizontal rail, and a through hole that straddles the upper end surface and the lower end surface and communicates with the first hole and the second hole, a tension member inserted through the through hole, the first hole, and the second hole is fixed to a fixing device that abuts against both the lower flange of the upper horizontal bar and the upper flange of the lower horizontal bar in a tensioned state; A wooden post unit characterized in that a notch is provided in a position corresponding to the fastener on at least one of the upper flange of the upper horizontal bar and the lower flange of the lower horizontal bar.

2. The wooden column unit according to claim 1, characterized in that the upper flange of the upper horizontal bar and the lower flange of the lower horizontal bar are each provided with bolt holes for bolting to upper and lower steel beams.

3. The lower flange of the upper horizontal rail and the wooden pole are further joined by a fail-safe fastener, The wooden pole unit according to claim 2, wherein the upper flange of the lower cross rail and the wooden pole are further joined by a separate fastener for fail-safe purposes.

4. The wooden pole unit according to claim 3, wherein the fasteners are provided at positions corresponding to the notches.

5. The wooden pole unit according to claim 2, characterized in that the tendons are unbonded PC crimped materials.

6. The wooden post unit according to claim 2, characterized in that the wooden post is a wall post formed from any one of a plurality of square timber units, laminated timber, solid wood, structural plywood, laminated veneer lumber, and cross-laminated timber.

7. A joint structure between a wooden column unit and a steel beam, characterized in that a wooden column unit as described in any one of claims 2 to 6 is arranged between the upper and lower steel beams, and the upper and lower steel beams and the wooden column unit are bolted together.

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