Joint structure

Abstract

To provide a joint structure or the like in which energy absorbing performance against repeated loading can be expected.SOLUTION: A joint structure 3 joins a beam 1 and a wooden wall 2. In the joint structure 3, the beam 1 and the wooden wall 2 are joined using a steel plate 4, and a damper part 42 that is displaced by a shearing force is provided between a joint part 41 of the beam 1 and the steel plate 4 and a joint part 43 of the wooden wall 2 and the steel plate 4. A honeycomb damper(R) can be used for the steel plate 4. The steel plate 4 is inserted into a slit 21 of the wooden wall 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a joint structure for wooden walls. [Background technology]

[0002] Because wooden materials are lightweight and have high strength relative to their weight, they are increasingly being used as earthquake-resistant walls (see, for example, Patent Document 1). Although wooden earthquake-resistant walls are easier to construct than reinforced concrete earthquake-resistant walls, wooden materials have low toughness and are prone to brittle fractures such as splitting, leaving issues with their deformation performance and ability to absorb vibration energy.

[0003] Therefore, when using wood materials as earthquake-resistant walls, steel materials such as drift pins and bolts are used at the joints between the columns and beams and the frame, causing the steel to yield and ensuring deformation performance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-314083 Summary of the Invention [Problem to be solved by the invention]

[0005] In drift pin joints, which are widely used in wooden earthquake-resistant walls, a gusset plate 100 fixed to a frame is inserted into a wooden wall 20, and a drift pin P is inserted through the wooden wall 20 and the gusset plate 100, as shown in the horizontal cross section of Figure 9(a).

[0006] However, when the drift pin P yields due to the shear force S of the wooden wall 20 as shown in Figure 9(b), the broken drift pin P sinks into the surrounding wood. Since the wood does not recover from the sinking deformation, the drift pin P cannot be expected to absorb energy effectively under repeated loads. This is also true for bolted joints.

[0007] The present invention has been made in view of the above problems, and its object is to provide a joint structure etc. that can be expected to have energy absorption performance under repeated loading. [Means for solving the problem]

[0008] The first invention for achieving the above-mentioned object is a joint structure between a wooden wall and a frame, in which the wooden wall and the frame are joined using steel plates, and a damper section that is displaced by a shear force is provided between the joint between the frame and the steel plate and the joint between the wooden wall and the steel plate, and the damper section is covered by the wooden wall. and the joint between the wooden wall and the steel plate is protruded in a rectangular or arc shape toward the joint between the frame and the steel plate in a range excluding both ends in the width direction of the steel plate. The joining structure is characterized by the above. The steel plate may also be inserted into a slit in the wooden wall.

[0009] In this invention, by placing a damper between the joint between the frame and the steel plate and the joint between the wooden wall and the steel plate, the damper displaces instead of the joint, absorbing vibration energy and achieving vibration control. In this case, drift pins or the like at the joint do not sink into the wood, impairing energy absorption performance, and the energy absorption performance of the damper can be expected even under repeated loading. Furthermore, by covering the damper with the wooden wall, the vibration control function is ensured, while the vibration control material is hidden from view from the outside, achieving an excellent aesthetic appearance. Furthermore, the steel plate can be made to conform to the bending deformation of the entire wooden wall while exhibiting energy absorption performance against shear forces.

[0010] The second invention is a joint structure between a wooden wall and a frame, wherein the wooden wall and the frame are joined using steel plates, and a damper section that is displaced by shear force is provided between the joint between the frame and the steel plate and the joint between the wooden wall and the steel plate, the steel plate is a honeycomb damper, and the damper section is arranged at an angle to the vertical direction. In this invention, by placing a damper section between the joint between the frame and the steel plate and the joint between the wooden wall and the steel plate, the damper section can be displaced instead of the joint, absorbing vibration energy and achieving vibration control. In this case, drift pins or the like at the joint will not sink into the wooden part, impairing the energy absorption performance, and the energy absorption performance of the damper section can be expected to be good under repeated loading. In addition, because the steel plate is a honeycomb damper, The damper section connecting the upper and lower joints of the honeycomb damper can be reliably displaced instead of the joints, allowing them to yield first. In addition, the honeycomb damper has a simple structure, making it easy to install. Furthermore, by arranging the damper section at an angle to the vertical direction, it is possible to prevent the damper section from being subjected to vertical forces, thereby ensuring deformation performance and energy absorption performance against shear forces. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a joint structure etc. that can be expected to have energy absorption performance against repeated loading. [Brief explanation of the drawings]

[0016] [Figure 1] A diagram showing the joint structure 3 between the beam 1 and the wooden wall 2. [Figure 2] A diagram showing steel plate 4. [Figure 3] A diagram showing how to join a wooden wall 2 and an upper beam 1. [Figure 4] FIG. [Figure 5] An example of detail for Wooden Wall 2. [Figure 6] FIG. 3 is a diagram showing a joint structure 3a. [Figure 7] FIG. 2 is a diagram showing the arrangement of steel plates 4. [Figure 8] FIG. 10 is a diagram showing a joint structure 3b. [Figure 9] 10A and 10B are diagrams for explaining the sinking of a drift pin P. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0018] [First embodiment] Figure 1 shows a joint structure 3 for a beam 1 and a wooden wall 2 according to a first embodiment of the present invention. Figure 1(a) is an elevation view of the wooden wall 2, and Figure 1(b) is a cross-sectional view taken along line aa in Figure 1(a).

[0019] The wooden wall 2 is a wall formed using wooden materials such as CLT (Cross Laminated Timber) and LVL (Laminated Veneer Lumber), but is not limited to these.

[0020] The wooden wall 2 is placed between upper and lower beams 1, which form the frame (skeleton) of the structure. The beams 1 are, for example, steel beams, but are not limited to this and may be made of reinforced concrete (RC), steel reinforced concrete (SRC), wood, etc.

[0021] The upper end of the wooden wall 2 is joined to the upper beam 1 using a steel plate 4. FIG. 2 is a diagram showing the steel plate 4. In this embodiment, a Honeycomb Damper (registered trademark) is used as the steel plate 4. The Honeycomb Damper is a steel damper made of extremely low yield point steel that functions as a shear yield type vibration control member.

[0022] The steel plate 4 has a shape in which multiple hexagonal holes are arranged in the longitudinal direction of the rectangular plate material. Above and below the holes are joints 41, 43 for joining to the target object, and damper parts 42 connecting the upper and lower joints 41, 43 between the holes are displaced (shear deformation) by shear forces such as during an earthquake, thereby absorbing vibration energy and damping vibrations.

[0023] As shown in FIGS. 1(a) and 1(b), a gusset plate 11 that protrudes downward from the underside of the beam 1 is fixed to the upper beam 1. The gusset plate 11 is a joining plate for joining steel plates 4, and has holes 111 used for joining. The steel plates 4 are fastened to the gusset plate 11 at the joint 41 using fasteners F such as bolts and nuts. Reference numeral 411 in FIG. 2 is a hole for passing the bolt of the fastener F, and is connected to the hole 111 in the gusset plate 11.

[0024] The joint 43 of the steel plate 4 is joined to the wooden wall 2 by a drift pin P. Reference numeral 431 in Figure 2 denotes a hole for passing the drift pin P. The steel plate 4 is inserted into the slit 21 at the upper end of the wooden wall 2. At this time, the position of the hole 22 that penetrates the wooden wall 2 in the thickness direction corresponds to the position of the hole 431 in the joint 43, and the drift pin P is inserted into these holes. The width of the steel plate 4 is approximately the same as the width of the wooden wall 2, and the slit 21 penetrates the wooden wall 2 in the width direction. Note that "width" refers to the length of the beam 1 in the longitudinal direction.

[0025] A slit 23 is also provided at the lower end of the wooden wall 2, into which a joining plate 8 is inserted. The plate 8 has a hole 81, the position of which corresponds to the position of a hole 24 that penetrates the wooden wall 2 in the thickness direction. The wooden wall 2 and the plate 8 are joined by inserting a drift pin P into these holes. The plate 8 protrudes downward from the lower end of the wooden wall 2, and this protruding part is joined to a gusset plate 12 fixed to the lower beam 1 using a fastener F. The gusset plate 12 protrudes upward from the top surface of the lower beam 1, leaving a gap between the lower end of the wooden wall 2 and the lower beam 1. This gap may be filled with a filler such as mortar.

[0026] To join the wooden wall 2 to the upper beam 1, first insert the steel plate 4 into the slit 21 of the wooden wall 2 shown in Figure 3(a), and use the drift pin P to join the joint 43 of the steel plate 4 to the wooden wall 2 as described above.

[0027] Then, the wooden wall 2 is moved as shown by the arrow in Figure 3(b), and the joint 41 of the steel plate 4 is overlapped with the gusset plate 11 of the beam 1, and the joint 41 and the gusset plate 11 are joined using the fastener F as described above.

[0028] As for the lower beam 1, a plate 8 is inserted into the slit 23 at the lower end of the wooden wall 2, and the wooden wall 2 and the plate 8 are joined using a drift pin P as described above, and then the plate 8 and the gusset plate 12 are joined using a fastener F as described above.

[0029] In the joint structure 3 of this embodiment, the damper section 42 between the joint 41 between the beam 1 and the steel plate 4 and the joint 43 between the wooden wall 2 and the steel plate 4 is shear deformed instead of the joints 41, 43, absorbing vibration energy and achieving vibration control. In this case, the drift pin P of the joint 43 does not sink into the wood, impairing its energy absorption performance, and the energy absorption performance of the damper section 42 can be expected to be maintained under repeated loading. By joining the wooden wall 2 and the beam 1 using the joint structure 3, a wooden wall 2 with excellent deformation performance and energy absorption performance is obtained, making it possible to apply the wooden wall 2 to ultra-high-rise buildings that must be able to withstand repeated loading due to long-period seismic motion.

[0030] In this embodiment, a honeycomb damper is used as the steel plate 4. The honeycomb damper has a simple structure and is easy to install. Furthermore, by using the honeycomb damper, the damper portion 42 connecting the upper and lower joints 41, 43 can be reliably subjected to shear deformation instead of the joints 41, 43, and can be made to yield first.

[0031] That is, when a gusset plate 100 is embedded in a wooden wall 20 and joined with a drift pin P as shown in Figure 9, the drift pin P will yield in bending before the gusset plate 100 due to the high in-plane rigidity and strength of the gusset plate 100. However, in the joint structure 3, the damper section 42, which has low in-plane rigidity and strength, can be made to yield before the drift pin P. This reduces the possibility of damage to the joints 41 and 43 of the steel plate 4 and the wood around the joints 43, preventing a decrease in energy absorption performance. The damper section 42 has high toughness and fatigue properties, mainly against shear deformation, so stable energy absorption performance can be expected under repeated loading.

[0032] Furthermore, in this embodiment, the steel plate 4 is inserted into the slit 21 formed in the wooden wall 2, so that the steel plate 4 can be hidden within the wooden wall 2, achieving an excellent aesthetic appearance.

[0033] However, the present invention is not limited to the above embodiment. For example, in this embodiment, the joint structure 3 is provided on the upper end side of the wooden wall 2, but it may also be provided on the lower end side, or on both the upper end side and the lower end side. However, the energy absorption performance is almost the same whether the joint structure 3 is used on either the upper end side or the lower end side or both sides. Furthermore, if the joint structure 3 is used on the lower end side of the wooden wall 2, the weight of the wooden wall 2 may affect the energy absorption performance.

[0034] Furthermore, as shown in steel plate 4a in Figure 4, the joint 43 of the steel plate 4a may be protruded in a rectangular shape toward the joint 41 in an area excluding both ends in the width direction of the steel plate 4a (see symbol 431), and the shear rigidity of the damper portion 42a at both ends in the width direction of the steel plate 4a may be made lower than the shear rigidity of the damper portion 42b therebetween.

[0035] When an in-plane bending moment M (see FIG. 1(a)) is applied to the wooden wall 2, vertical forces act mainly at the four corners of the vertical surface of the wooden wall 2, and the damper sections 42a, which have low shear rigidity and are located at both ends of the wooden wall 2 in the width direction, resist the vertical force and are more likely to follow the bending deformation of the entire wooden wall 2. This allows the steel plate 4a to follow the bending deformation of the entire wooden wall 2 while exhibiting energy absorption performance against shear forces. The shape of the damper sections 42a is not particularly limited; for example, rod-shaped rebar or rectangular steel plates may be used as the damper sections 42a. Furthermore, the protruding shape of the joints 43 is not limited to the rectangular shape described above, and may also protrude in an arc shape.

[0036] Alternatively, as shown in Figure 5, both widthwise ends of the wooden wall 2 may be in contact with the upper beam 1. This allows compressive force to be directly transmitted between the beam 1 and the wooden wall 2, and when an in-plane bending moment M occurs in the wooden wall 2, compressive stress is generated in the wooden wall 2, increasing its strength. It is also possible to fill the gap between both widthwise ends of the wooden wall 2 and the upper beam 1 with a filler such as mortar.

[0037] The wooden wall 2 may also be formed by stacking two wooden boards one on top of the other. In this case, the slits 21 and 23 can be formed by overlapping notches that have been previously formed in both wooden boards. Alternatively, the two wooden boards may be arranged without notches, with the steel plate 4 or plate 8 sandwiched between them from the front and back. In this case, a gap is formed between the two wooden boards in the area excluding the steel plate 4 or plate 8.

[0038] Hereinafter, other examples of the present invention will be described as the second and third embodiments. In the second and third embodiments, differences from the first embodiment will be described, and similar configurations will be denoted by the same reference numerals in the drawings and the like, and description thereof will be omitted. Furthermore, the configurations described in each embodiment, including the first embodiment, can be combined as necessary.

[0039] [Second embodiment] Figure 6 shows a joint structure 3a between a beam 1 and a wooden wall 2a according to a second embodiment of the present invention. Figure 6(a) is an elevation view of the upper half of the wooden wall 2a, and Figure 6(b) is a cross-sectional view taken along line bb in Figure 6(a). The second embodiment differs from the first embodiment mainly in that the steel plate 4 is provided on the outside of the wooden wall 2a and the damper section 42 is arranged at an angle to the vertical direction.

[0040] The steel plate 4 is bent into a Z shape so that the joints 41 and 43 are horizontal and the damper 42 is diagonal. The joint 41 is joined to the underside of the beam 1 using a fastener F, and the joint 43 is joined to the top surface of the wooden wall 2a using a bolt B.

[0041] A hole (not shown) for passing the male thread of bolt B is provided in joint 43, and a female thread (not shown) that screws onto the male thread is embedded in the upper end of wooden wall 2a. Above joint 43, there is a space large enough to allow tightening of bolt B with an adjustable wrench or the like.

[0042] In the joint structure 3a of the second embodiment, in addition to obtaining the same effects as the joint structure 3 of the first embodiment, the bent portion of the steel plate 4 bends and stretches in response to a vertical force such as a bending moment M, so that the damper portion 42 is not affected by the vertical force, and deformation performance and energy absorption performance against shear force can be ensured. Also, by bending the steel plate 4 and joining it to the wooden wall 2 and the beam 1, the height can be reduced, so that the steel plate 4 can be hidden in the attic or the like, making it easier to maintain a beautiful appearance.

[0043] In this embodiment, the steel plate 4 is bent, but the joints 41, 43 and the damper 42 may be manufactured separately and assembled into a Z-shape to form an integrated unit. Furthermore, as shown in Fig. 7(a), this embodiment can be applied by adjusting the sizes of the joints 41, 43 even when the beam 1 and the wooden wall 2a are eccentric due to design considerations or the like.

[0044] In this embodiment, the steel plate 4 is bent in a Z shape, and the joint 41 and the damper portion 42, and the damper portion 42 and the joint 43 form acute angles, respectively. However, as shown in Fig. 7(b), the steel plate 4 may be bent so that the joints 41, 43 and the damper portion 42 form obtuse angles, respectively. This makes it easier to process the steel plate 4.

[0045] In the example of Figure 7(b), steel plate 4 extends on both sides of wooden wall 2a in the front-to-back direction (corresponding to the left-to-right direction in Figure 7(b)), and plates 13 and 25, which extend on opposite sides of wooden wall 2a in the front-to-back direction, are fixed to the underside of beam 1 and the top surface of wooden wall 2a using fasteners F and bolts B, respectively. Joint 41 of steel plate 4 and plate 13 are joined by fastener F on one of the front and back sides of wooden wall 2a, and joint 43 of steel plate 4 and plate 25 are joined by fastener F on the opposite side.

[0046] [Third embodiment] Figure 8 shows a joint structure 3b between a beam 1 and a wooden wall 2b according to a third embodiment of the present invention. Figure 8(a) is an elevation view of the upper half of the wooden wall 2b, Figure 8(b) is a cross-sectional view taken along line cc in Figure 8(a), and Figure 8(c) is an enlarged view of area d in Figure 8(b).

[0047] In the joint structure 3b of this embodiment, the wooden wall 2b and the beam 1 are joined using steel plates 5, 6 and a damper section 7. As shown in Fig. 8(c), the steel plates 5, 6 and the damper section 7 are integrated with fasteners F, with the damper section 7 sandwiched between the steel plates 5, 6 from the front and back. The damper section 7 is a plate-shaped vibration-damping member made of a viscoelastic material such as rubber that absorbs vibration energy by displacing (shear deformation) due to shear force.

[0048] A slit 26 is formed at the upper end of the wooden wall 2b, and the steel plates 5, 6 and the damper unit 7 are inserted into this slit 26. The width of the steel plates 5, 6 and the damper unit 7 is approximately the same as the width of the wooden wall 2b, and the slit 26 penetrates the wooden wall 2b in the width direction.

[0049] The steel plate 5 is joined to the wooden wall 2b by a drift pin P. The wooden wall 2b has a hole 28 that penetrates the wooden wall 2b in the thickness direction, and the drift pin P is inserted through the hole 51 in the steel plate 5 and the hole 28 in the wooden wall 2b. Meanwhile, the steel plate 6 is joined to the gusset plate 11 of the beam 1 by a fastener F. As described above, the steel plates 5 and 6 are joined by the fastener F with the damper portion 7 sandwiched between them. Reference numeral 27 in Figures 8(a) to (c) denotes a work hole used for fastening the fastener F, and is provided on the front and back of the slit 26 as a long hole extending in the width direction of the wooden wall 2b.

[0050] In the joint structure 3b of the third embodiment, the same effect as in the first embodiment can be obtained by providing a damper section 7 between the steel plate 6 joined to the beam 1 and the steel plate 5 joined to the wooden wall 2. Note that a friction-type vibration-damping member may be used instead of the damper section 7. In this case, vibration energy is absorbed by the frictional resistance when the vibration-damping member is displaced by shear force.

[0051] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the technical ideas disclosed in this application, and it is understood that these modifications and alterations also fall within the technical scope of the present invention. [Explanation of symbols]

[0052] 1: Beam 2, 2a, 2b, 20: Wooden wall 3, 3a, 3b: Joint structure 4, 4a, 5, 6: Steel plate 7, 42, 42a, 42b: Damper section 11, 12, 100: Gusset plate 21, 23, 26: Slits 41, 43: Joint

Claims

1. A joint structure between a wooden wall and a frame, The wooden wall and the frame are joined using steel plates, a damper portion that is displaced by a shear force is provided between the joint portion between the frame and the steel plate and the joint portion between the wooden wall and the steel plate; The damper portion is covered by the wooden wall, The joint between the wooden wall and the steel plate is protruded in a rectangular or arc shape toward the joint between the frame and the steel plate in a range excluding both ends in the width direction of the steel plate. A joining structure characterized by:

2. The joint structure according to claim 1, wherein the steel plate is inserted into a slit in the wooden wall.

3. A joint structure between a wooden wall and a frame, The wooden wall and the frame are joined using steel plates, a damper portion that is displaced by a shear force is provided between the joint portion between the frame and the steel plate and the joint portion between the wooden wall and the steel plate; the steel plate is a honeycomb damper, A joint structure characterized in that the damper portion is disposed obliquely with respect to the vertical direction.

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