JP7652387B2 - Vibration damper for wooden structures and vibration damping structure for wooden structures - Google Patents

Description

The present invention relates to a vibration damper for wooden structures that can efficiently absorb vibration energy as a whole, and a vibration control structure for wooden structures.

In general, a damper that absorbs vibration energy acting on a structure is known, for example, from Patent Document 1. The "seismic damper" of Patent Document 1 aims to provide a seismic damper that can suppress the loss of cumulative deformation capacity, and the yield shear force in the in-plane direction is smallest at a position shifted from the base of the column to the center, and is largest at the center. In other words, the yield shear force of the column is smallest at a position shifted from the base to the center for deformation in the in-plane direction (width direction), so the dangerous cross-sectional position is a position shifted from the base of the column to the center. The yield shear force in the out-of-plane direction is smallest at the end of the column in the X direction, and is largest at the center. In other words, the yield shear force of the column is smallest near the base for deformation in the out-of-plane direction (thickness direction), so the dangerous cross-sectional position is near the base of the column. In this way, in this embodiment, the dangerous cross-sectional position in the in-plane direction deformation is shifted toward the center of the column, relative to the dangerous cross-sectional position in the out-of-plane direction deformation.

JP 2017-25674 A

The background technology is to make the dangerous cross-sectional positions different for in-plane and out-of-plane deformation when deformation occurs in a seismic damper due to external vibration forces, thereby preventing loss of deformation capacity.

However, when designing the vibration damper, the deforming parts for in-plane and out-of-plane deformation were separated, so the range in which vibration energy could be effectively absorbed for each deformation was small. Also, because only the plastic section modulus was taken into consideration, only a portion of the entire vibration damper contributed to absorbing vibration energy, and the plastic deformation capacity of the vibration damper was not fully utilized. When excessive deformation occurred due to external vibration forces, partial stress concentration occurred, and there was a risk of early breakage.

The present invention was devised in consideration of the above-mentioned problems with the conventional structure, and aims to provide a vibration damper for wooden structures and a vibration control structure for wooden structures that can efficiently absorb vibration energy overall.

The vibration damper for wooden structures according to the present invention is a vibration damper that is installed horizontally between the middle of the vertical direction of a pair of adjacent wooden vertical members in the horizontal direction, the upper and lower ends of which are joined to upper and lower horizontal members, and is installed horizontally between the upper and lower height directions of the pair of wooden vertical members that are adjacent in the horizontal direction. The damper is equipped with a pair of left and right joint metals that are joined to each of the pair of wooden vertical members and spaced apart from each other in the horizontal direction, a damping member that is arranged between the joint metals and has a pair of joints at both left and right horizontal ends, and a pair of left and right connecting members that are joined at one end to each joint of the damping member and at the other end to each of the pair of joint metals, and connect each joint of the damping member to each of the joint metals, the damping member is formed of a flat steel plate material, has each joint at both left and right horizontal ends and a main body between these joints, and is characterized in that the outer contour of the main body from each of the joints toward the center in the horizontal direction is defined by a curve determined by the combined stress of the plastic section modulus and the shear stress.

The curve that defines the outer contour of the main body is characterized by being determined by the Mises yield condition.

The vertical height dimension of each joint of the damping member is larger than the vertical height dimension of the main body.

The yield strength of the main body of the damping member is smaller than the yield strength of each of the connecting member and the metal joint.

The metal joint is a steel plate-like material having a vertical member joint formed in the vertical direction of the wooden vertical member and joined to the wooden vertical member, a connecting member joint protruding from the vertical member joint toward the damping member and to which the connecting member is joined, and a pair of upper and lower energy absorbing parts formed to extend between the protruding tip of the connecting member joint and the upper and lower ends of the vertical member joint, absorbing energy by buckling deformation in the out-of-plane direction.

The metal joints are arranged in pairs on both sides of the damping member in the front-rear direction.

The connecting member is characterized in that it is joined to the joint portion of the damping member from both sides in the front-rear direction.

The connection member is characterized in that it is made of a steel pipe having a slit into which the joint of the damping member is inserted.

The pair of left and right connecting members and the damping member are joined together to form a unit.

The vibration control structure for a wooden structure according to the present invention is characterized in that the vibration control damper for a wooden structure is arranged to span the left and right horizontal directions between the midpoints in the vertical direction of a pair of adjacent wooden vertical members of the wooden structure.

The vibration damper for wooden structures and the vibration control structure for wooden structures of the present invention can efficiently absorb vibration energy as a whole.

1 is a conceptual diagram of a preferred embodiment of a vibration damper for a wooden structure and a vibration control structure for a wooden structure according to the present invention. 1 is a front view showing a preferred embodiment of a vibration damper for a wooden structure according to the present invention, the vibration damper being installed between a pair of wooden vertical members. FIG. This is a view taken along line AA in FIG. 4 is an explanatory diagram illustrating the joining state of a damping member used in the vibration damper for wooden structures shown in Figure 2 to a connecting member, where Figure 4(A) is a front view, Figure 4(B) is a plan view, Figure 4(C) is a side view, and Figure 4(D) is a cross-sectional view taken along line B-B in Figure 4(A). FIG. 3 is an exploded assembly diagram of the vibration damper for a wooden structure shown in FIG. 2 . 6A and 6B are explanatory views for explaining a modified example of the vibration damper for a wooden structure according to the present invention, in which FIG. 6A is a front view and FIG. 6B is a plan view.

Below, preferred embodiments of the vibration damper for wooden structures and the vibration control structure for wooden structures according to the present invention will be described in detail with reference to the attached drawings. Figure 1 shows a conceptual diagram of the vibration damper for wooden structures according to this embodiment.

The wooden structure 1 is composed of a number of wooden vertical members 2 arranged at appropriate intervals in the left and right horizontal directions, and horizontal members, such as wooden horizontal members 3, which are formed long above and below the wooden vertical members 2 in the direction in which the wooden vertical members 2 are arranged. The following description will be given using wooden horizontal members 3 as an example of a horizontal member.

When vertical wooden members 2 are installed at external or internal corners, the horizontal members are attached from the left-right and front-to-back directions. Furthermore, in the illustrated example, the upper and lower horizontal members are arranged parallel to each other, but there are also cases where the horizontal members are arranged in the left-right direction above the vertical wooden members 2 and in the front-to-back direction below the vertical wooden members 2, so that the horizontal members are arranged crosswise from top to bottom.

In this embodiment, the wooden vertical members 2 and wooden horizontal members 3 are made of rectangular timber with a square cross section, but the shape of the cross section is not important.

The wooden structure 1 is constructed by joining the upper and lower ends of multiple wooden vertical members 2, which are set upright in the vertical height direction, to the upper and lower surfaces of lower and upper wooden horizontal members 3, which are set horizontally to the left and right. The wooden vertical members 2 and the wooden horizontal members 3 can be joined using various commonly known metal fittings and hardware, and a commonly known joining method can be used.

The wooden vertical members 2 may be columns of a wooden building or vertical members built into a wall. The upper and lower horizontal members exemplified by the wooden horizontal members 3 may be, for example, the foundation itself, or the base, joists laid on the base, and beams for the first floor in the case of the first floor of a wooden building, or beams for the first and second floors in the case of the second floor.

A vibration damper 4 is incorporated into the wooden structure 1 to provide it with a vibration damping effect. The vibration damper 4 is installed horizontally across the middle of the vertical direction of a pair of adjacent wooden vertical members 2 in the left-right direction of the wooden structure 1, connecting these wooden vertical members 2 together.

The vibration damper 4 may be located at any height position as long as it is midway up and down the wooden vertical member 2.

The vibration damper 4 is attached to each of a pair of wooden vertical members 2 and includes a pair of left and right connecting metal members 5 spaced apart from each other in the left-right horizontal direction, a damping member 6 located in the center between the pair of wooden vertical members 2 and in the space between the pair of connecting metal members 5, and a pair of left and right connecting members 7 that connect the damping member 6 to the left and right connecting metal members 5. The left connecting metal member 5, the left connecting member 7, the central damping member 6, the right connecting member 7, and the right connecting metal member 5 are arranged in a series in the left-right horizontal direction.

The damping member 6 is positioned so that the constricted portion 8, which will be described later, does not overlap the left and right joining metal fittings 5. The connecting member 7 has, along its length, one end 7a that is overlapped with the damping member 6 in order to join with the damping member 6, and the other end 7b that is overlapped with the joining metal fittings 5 in order to join with the joining metal fittings 5 (see Figures 2 and 3).

In the illustrated example, a vibration damper 4 is shown that has two damping members 6 arranged in two upper and lower stages in the vertical height direction of the wooden structure 1, and the connecting members 7 are also arranged in two upper and lower stages, and accordingly, the connecting metal members 5 are also arranged in two upper and lower stages. The upper and lower stages of the connecting metal members 5 are integrally formed as a continuous unit in the vertical height direction.

Not limited to the illustrated example, as long as there is one or more damping members 6, the number of damping members, i.e., the number of stages, can be any number, and the joining metal members 5 and connecting members 7 are provided according to the number of damping members 6.

The vibration damper 4 is shown in detail in Figures 2 to 4. Figure 2 is a front view showing the vibration damper 4 installed between a pair of wooden vertical members 2, Figure 3 is a view taken along line A-A in Figure 2, and Figure 4 is an explanatory diagram explaining the state in which the damping member 6 is joined to the connecting member 7, with Figure 4(A) being a front view, Figure 4(B) being a plan view, Figure 4(C) being a side view, Figure 4(D) being a cross-sectional view taken along line B-B in Figure 4(A), and Figure 5 being an exploded view of the vibration damper 4.

Each damping member 6 is made of a flat steel plate of a uniform thickness with flat front and back surfaces. A pair of left and right joints 6a are formed on both left and right lateral ends of the damping member 6, which serve as joints with the connecting member 7.

Between these joints 6a, the damping member 6 has a constricted portion 8, which is the main body of the damping member 6. In other words, the damping member 6 is configured to have joints 6a at both ends in the left and right lateral directions and a constricted portion 8 between these joints 6a. The constricted portion 8 of the damping member 6 is formed with an outer contour that is symmetrical about the vertical axis X at the central position in the length direction of the damping member 6 along the left and right lateral directions of the wooden structure 1 (the central position between a pair of wooden vertical members 2).

In other words, the constricted portion 8 is formed at a position equidistant from the vertical axis X at the center position in the left and right lateral directions, with equal vertical and height dimensions (width dimensions).

The contour of the constricted portion 8 is defined by a curve C determined by the combined stress of the plastic section modulus and shear stress described below, which extends from each joint 6a toward the vertical axis X position at the center of the left and right lateral directions, in order to set a cross section at the constricted portion 8 such that the entire cross section of the constricted portion 8 is deformed simultaneously in response to a horizontal external vibration force.

The damping member 6 is formed so that the constricted portion 8 is smoothly connected to each joint 6a, i.e., connected with an outwardly convex arcuate contour so as to have no corners, and the vertical height dimension of the joint 6a is larger than the vertical height dimension of the constricted portion 8.

A pair of connecting members 7 are joined to each of the pair of left and right joints 6a of the damping member 6 from the left and right wooden vertical members 2.

The pair of connecting members 7 have one end 7a connected to the left and right joints 6a of the damping member 6, respectively, and the other end 7b connected to the pair of left and right joint metal fittings 5, respectively, to connect the damping member 6 to the left and right joint metal fittings 5.

In this embodiment, each connection member 7 is formed from a square steel pipe. A slit 9 is formed in one end 7a of the connection member 7 in the center of its width (front-rear direction of the wooden structure 1) from the edge of the end 7a in the length direction for inserting the joint 6a of the damping member 6. The damping member 6 is joined to the connection member 7 by fitting and welding the joint 6a of the damping member 6 into the slit 9 of the connection member 7.

At this time, the upper and lower ends of the joint 6a are each protruded in the vertical direction from the connecting member 7, and the two are joined by a fillet weld W.

By joining in this manner, the connection member 7 is connected to the damping member 6 with the joint 6a sandwiched between the wooden structure 1 on both the front and rear sides.

The pair of left and right connecting members 7 and damping members 6 joined together may be treated as a united part.

The connection member 7 may be a plate material such as a steel plate or a shaped steel such as a channel material. In this case, the plate material or shaped steel may be joined in pairs to the joint 6a of the damping member 6 so that they are sandwiched from both sides in the front-to-rear direction, or only one may be joined from either side.

Alternatively, wood may be used as the connecting member 7. In this case, for example, the slit 9 may be formed in the wood, the joint 6a of the damping member 6 may be inserted, and the two may be joined with a drift pin. Alternatively, the wood may be overlapped on the joint 6a, and the two may be joined with wood screws or nails.

A pair of left and right connecting metal fittings 5 are joined to the other end portions 7b of the pair of left and right connecting members 7, respectively. In this embodiment, a pair of connecting metal fittings 5 are arranged on both sides of the damping member 6 in the front-to-rear direction of the wooden structure 1, sandwiching the connecting member 7 from both sides in the front-to-rear direction. Therefore, a total of four connecting metal fittings 5 are provided for each damping member 6, on the left and right and front and rear.

The joint metal 5 may be arranged on only one side in the front-to-rear direction. For example, if the connection member 7 is joined to the joint 6a of the damping member 6 on only one side in the front-to-rear direction, then only one joint metal 5 is joined to this connection member 7 on the same side.

Each connecting metal 5 is formed using a steel plate material with flat front and back surfaces. A vertical member joint 5a is formed on the edge portion of the connecting metal 5 facing the wooden vertical member 2 in the vertical height direction of the wooden vertical member 2, and is joined to the wooden vertical member 2. When the connecting metal 5 is joined to the wooden vertical member 2, the vertical member joint 5a abuts against the peripheral side surface of the wooden vertical member 2.

In the illustrated example (see Figure 3), the front-to-rear dimension of the vibration damper 4 is smaller than the front-to-rear dimension of the wooden vertical member 2. In this case, the vertical member joint 5a is formed by bending the edge portion of the joint metal 5 along the vertical height direction into an L-shape so that it fits along the peripheral side of the wooden vertical member 2.

Therefore, the vertical member joint 5a is designed to abut against either side of the wooden vertical member 2 facing in the left-right direction.

Unlike the illustrated example, when the longitudinal dimension of the vibration damper 4 is approximately the same as the longitudinal dimension of the wooden vertical member 2, the vertical member joint 5a abuts against one of the sides of the wooden vertical member 2 facing the longitudinal direction without bending the edge portion of the joint metal 5, remaining flat.

The metal joint 5 is joined to the wooden vertical member 2 by screwing a screw 10 into the wooden vertical member 2 through a screw hole formed in the vertical member joint 5a.

The metal joint 5 has a connection member joint 5b that protrudes from the vertical member joint 5a toward the damping member 6 and to which the other end 7b of the connection member 7 is joined.

The connection member joint 5b abuts against the front or rear surface of the other end 7b of the connection member 7, and the abutment range is the connection member joint 5b for the connection member 7.

In other words, the connection member joint 5b is defined by the dimensions, shape, etc. of the other end 7b of the connection member 7, which is abutted and joined from the protruding tip 5c, which is the tip in the protruding direction, to the wooden vertical member 2 side.

Unlike the vertical member joint 5a, which may be formed by bending, the connecting member joint 5b is formed by the plate surface of the connecting metal 5 itself, and this plate surface is overlapped and abutted against the other end 7b of the connecting member 7.

In the illustrated example, the connecting member 7 is joined to the metal joint 5 with a gap between the other end 7b and the wooden vertical member 2.

The metal joint 5 and the connection member 7 are joined by mounting fasteners 11 such as screws that can be easily aligned to absorb dimensional and assembly errors between the vertical wooden members 2 and the horizontal wooden members 3, as well as dimensional errors between the damping members 6 and the vertical wooden members 2.

In addition, by attaching and detaching the mounting connector 11, the unitized damping member 6 and the pair of connecting members 7 can be easily replaced at any time for the connecting metal fitting 5.

In each joint metal 5, a pair of upper and lower energy absorbing sections 12 are formed by the joint metal 5 itself at the upper and lower corners partitioned by the wooden vertical members 2 above and below the connecting member 7 between the vertical member joint 5a and the connecting member joint 5b, that is, at the upper and lower corners partitioned by the wooden vertical members 2 above and below the connecting member 7 by the joint metal 5 in a direction in which the connecting member 7 butts against the wooden vertical members 2.

Looking at one of the upper and lower two-tiered damping members 6, there are four corners on both the left and right lateral sides of the damping member 6, both above and below, and these corners form upper and lower energy absorption sections 12 using four metal joints 5.

These energy absorbing sections 12 are buckled and deformed in the out-of-plane direction by the compressive load when a horizontal external vibration force that topples the wooden vertical members 2 acts on the wooden structure 1, causing deformation, and are designed to absorb energy in a hysteretic manner due to the repetition of this buckling deformation.

When viewed above the upper damping member 6, the energy absorbing section 12 is configured with a protruding edge 5d at the corner portion that extends from at least the protruding tip 5c of the connecting member joint 5b toward the upper end of the vertical member joint 5a.

In detail, this energy absorbing section 12 protrudes upward from the connecting member joint 5b and laterally from the vertical member joint 5a. This protruding shape is defined by a protruding edge 5e that starts at the upper end of the vertical member joint 5a and rises laterally in a predetermined left-right dimension in parallel with the connecting member joint 5b, and the protruding edge 5d that extends from the end of this protruding edge 5e toward the protruding tip 5c of the connecting member joint 5b.

In the illustrated example, the protruding edge 5d is composed of an inclined portion 5f that gradually moves away from the vertical member joint 5a as it moves from the upper end side of the vertical member joint 5a toward the connecting member joint 5b downward in the vertical height direction, and a curved portion 5g that is continuous with the inclined portion 5f and converges toward the upper edge of the connecting member joint 5b.

Furthermore, the protruding edge portion 5d is at least partially formed with a bent portion 5h for stiffening the energy absorbing portion.

The bent portion 5h bears the stress that occurs along the protruding edge portion 5d when the energy absorbing portion 12 buckles, thereby preventing the energy absorbing portion 12 from being locally broken and prematurely destroyed. The bent portion 5h can also resist the torsional deformation that occurs in the connecting metal member 5.

The energy absorbing section 12 formed below the lower damping member 6 is configured in the same manner.

The vibration damper 4 of this embodiment integrates the upper and lower two-tiered arrangement of damping members 6; that is, the connecting metal 5 is configured by integrating the lower energy absorbing part 12 for the upper tiered damping member 6 and the upper energy absorbing part 12 for the lower tiered damping member 6 in a series so that the upper and lower tiered damping members 6 are joined together to the wooden vertical member 2, and the protruding edge 5d of the lower energy absorbing part 12 for the upper tier and the upper energy absorbing part 12 for the lower tier are connected linearly in the vertical height direction via a quarter-circular curved part.

When there is only one damping member 6, an energy absorbing portion 12 is formed at each of the upper and lower corners of the connection member joint 5b, which is defined by the protruding edge 5d having the protruding edge 5e and the inclined portion 5f described above.

The yield strength of the joint metal 5 and the connection member 7 described above are each set to be greater than the yield strength of the constricted portion 8 of the damping member 6. Therefore, unless the external vibration force is extremely large, energy is absorbed in the constricted portion 8. In the event that the external vibration force is extremely large, energy is absorbed by the joint metal 5 as well.

In this embodiment, the outer contour of the constricted portion 8, which is symmetrical with respect to the vertical axis X described above, is determined by the combined stress of the plastic section modulus and the shear stress.

When an external vibration force is applied to the damping member 6 from the horizontal direction and shear force is generated in the constricted portion 8, bending stress and shear stress are generated in the constricted portion 8.

Taking this into consideration, in order to absorb energy efficiently, it is desirable to form the constriction 8 in a shape that is suited to this stress state.

The load at which deformation due to bending stress begins is determined by P = σ · Zp/L (1).
P: load, σ: yield stress, Zp: plastic section modulus (b·h ² /4; b: plate thickness, h: vertical height dimension (width dimension))
L: Horizontal distance from the center of the constriction (vertical axis)

The load at which deformation due to shear stress begins is determined by P = τ · A (2).
τ: Yield shear stress A: Cross-sectional area of the neck (b h)

If no bending moment occurs, the stress occurring in the constricted portion 8 will be only shear stress. Based on equation (2), the shear stress τ can be calculated from the cross-sectional area (τ = P/A). In that case, the cross-sectional area of the constricted portion 8 can be constant.

If no shear force is generated, the stress generated in the constricted portion 8 will be only bending stress. Based on formula (1), the bending stress σ can be calculated from the plastic section modulus according to the lateral distance L from the constricted portion 8. In that case, the cross-sectional area is zero at the center of the constricted portion 8 (vertical axis X), and the required cross-sectional area increases as the distance L increases.

The thickness of the constricted portion 8 (damping member 6) is constant, so the vertical height dimension is large. In reality, due to the structure, a cross section connecting the left and right sides is required at the vertical axis X position.

From the above considerations, taking into account that bending moment and shear force actually occur simultaneously, the Mises yield condition σvm (σvm = √( ^σ2 + ^3τ2 )) is used for the combined stress of the plastic section modulus and shear stress, and the value is found for all the left and right lateral cross sections of the constricted portion 8 to determine the curve C of the constricted portion 8.

As a result, when an external vibration force acts, the entire cross section of the constricted portion 8 is deformed simultaneously, absorbing the vibration energy.

Next, we will explain the operation of the vibration damper for wooden structures and the vibration control structure for wooden structures according to this embodiment.

As shown in FIG. 5, the vibration damper 4 is manufactured by joining one end 7a of the connection member 7 to each joint 6a of the damping member 6, thereby producing a unitized part.

On the other hand, a pair of left and right joint metals 5 are joined to each of a pair of adjacent wooden vertical members 2 via vertical member joints 5a.

Finally, the left and right connection members 7 are joined to the left and right joint metal fittings 5 via the connection member joints 5b.

As a result, vibration dampers 4 are installed horizontally in the left and right lateral directions between the wooden vertical members 2 of the wooden structure 1, and a vibration control structure for the wooden structure 1 is constructed.

When a horizontal vibration external force such as an earthquake acts, if the external force is not extremely large, deformation stress is generated in a concentrated manner in the constricted portion 8 of the damping member 6 through the joint metal 5 and the connecting member 7.

The outer contour of the constricted portion 8 is defined by curve C, which is determined by the combined stress of the plastic section modulus and shear stress, and the bending stress and shear stress cause deformation simultaneously across the entire cross section, making it possible to utilize the entire material and efficiently and effectively absorb vibration energy.

On the other hand, when the external force is extremely large, the joint metal 5 has a higher yield strength than the constricted portion 8, so the energy absorption portion 12 of the joint metal 5 can absorb the vibration energy, preventing the constricted portion 8 from being damaged by extreme deformation.

In other words, in the vibration damper and vibration control structure of this embodiment, when the external vibration force is large, the connecting metal 5 and the damping member 6 absorb the vibration energy, and when the external vibration force is small, the damping member 6 absorbs the vibration energy by switching depending on the magnitude of the external vibration force, thereby enabling effective vibration control, and the constricted portion 8 provided in the damping member 6 ensures sufficient vibration control function.

The curve C of the constricted portion 8 is determined by the Mises yield condition, so that the constricted portion 8 can be formed in an appropriate shape according to the stress state, and the entire cross section can be deformed simultaneously to efficiently absorb vibration energy.

The damping member 6 is joined to the metal joint 5 via the connecting member 7, and the metal joint 5 can reliably prevent out-of-plane deformation of the damping member 6.

The vibration damper 4 can be installed at any suitable position in the vertical direction of the wooden vertical member 2, avoiding pipes and openings, ensuring a high degree of freedom in design and construction.

The vertical height dimension of the joint 6a of the damping member 6 is set to be larger than the vertical height dimension of the constricted portion 8, so that the constricted portion 8 can stably exert its vibration damping performance regardless of the dimensions, shape, etc. of the connecting member 7.

The yield strength of the constricted portion 8 is smaller than the yield strength of the connecting member 7 and the connecting metal 5, so that the constricted portion 8 can reliably absorb vibration energy when the external vibration force is not extremely large, and when the external vibration force is extremely large, the load on the constricted portion 8 is reduced so that the constricted portion 8 is not damaged, and the connecting metal 5 can reliably absorb the vibration energy.

The metal joint 5 is provided with an energy absorbing section 12 in addition to the joints 5a, 5b with the wooden vertical member 2 and the connecting member 7, so that the vibration energy can be appropriately absorbed by this energy absorbing section 12.

The connecting metal fittings 5 are arranged in pairs, positioned on both sides of the damping member 6 in the front-to-rear direction, so that the connecting metal fittings 5 can resist torsional forces and can appropriately apply horizontal external forces to the constricted portion 8 of the damping member 6 to damp vibrations.

The connecting member 7 is joined to the joint 6a of the damping member 6 from both front and rear sides, so that the joint 6a can be firmly held in place, allowing the external vibration force to be appropriately transmitted to the constricted portion 8 while suppressing out-of-plane deformation of the damping member 6.

The connecting member 7 is a steel pipe with a slit 9 into which the joint 6a of the damping member 6 is inserted, which suppresses out-of-plane deformation of the damping member 6 and allows the two to be joined easily and reliably.

The pair of left and right connecting members 7 and the damping member 6 are joined together to form a unit that can be handled as one part, making on-site assembly work more efficient and easier.

The vibration control structure for the wooden structure according to this embodiment is equipped with the vibration control damper 4 described above, which can reliably and efficiently absorb the energy of external vibration forces, thereby providing excellent vibration control performance.

Figure 6 shows a modified version of the above embodiment. In this modified version, the slit 9 is formed at one end 7a of the pair of left and right connecting members 7 so that it is much longer than the joint 6a of the damping member 6, and the joint 6a is joined to the back side of the slit 9. As a result, the connecting member 7 is assembled to the damping member 6 so that only the vicinity of the vertical axis X of the constricted portion 8 appears between the connecting members 7.

By configuring it in this way, the constricted portion 8 can be surrounded by the connecting member 7 and protected. This modified example, of course, achieves the same effects as the above embodiment.

REFERENCE SIGNS LIST 1 Wooden structure 2 Wooden vertical member 3 Wooden horizontal member 4 Vibration damper 5 Joint metal 5a Vertical member joint 5b Connection member joint 5c Protruding tip of connection member joint 6 Damping member 6a Joint 7 Connection member 7a One end 7b Other end 8 Necked portion 9 Slit 12 Energy absorbing portion C Curve of outer contour of necked portion

Claims (10)

A vibration damper is provided in a wooden structure formed by joining upper and lower ends of a plurality of wooden vertical members to upper and lower horizontal members, the vibration damper being provided in a horizontal direction between upper and lower mid-way portions of a pair of wooden vertical members adjacent in the horizontal direction, the vibration damper comprising:
A pair of left and right joint metals are joined to each of the pair of wooden vertical members and spaced apart from each other in the left and right lateral directions;
A damping member is disposed between the metal joints and has a pair of joints at both ends in the left and right lateral directions.
a pair of left and right connecting members, one end of which is joined to each joint of the damping member and the other end of which is joined to each of the pair of joint metals, for connecting each joint of the damping member to each of the joint metals,
The above-mentioned damping member is formed from a flat steel plate and has joints at both left and right lateral ends and a main body between these joints, and the outer contour of the main body from each of the joints toward the center in the left and right lateral directions is defined by a curve determined by the combined stress of the plastic section modulus and shear stress. 2. The vibration damper for wooden structures according to claim 1 , wherein the vertical dimension of each joint of the damping member is greater than the vertical dimension of the main body. 3. The vibration damper for wooden structures according to claim 1 , wherein the yield strength of the main body of the damping member is smaller than the yield strength of each of the connecting member and the metal joint. The vibration damper for wooden structures described in any one of claims 1 to 3, characterized in that the connecting metal is a steel plate-like material having: a vertical member joint formed in the vertical height direction of the wooden vertical member and joined to the wooden vertical member; a connecting member joint protruding from the vertical member joint toward the damping member and to which the connecting member is joined; and a pair of upper and lower energy absorption parts formed to extend between the protruding tip of the connecting member joint and the upper and lower ends of the vertical member joint, absorbing energy by buckling deformation in the out-of-plane direction. The vibration damper for wooden structures according to any one of claims 1 to 4 , characterized in that a pair of said metal joints are arranged so as to be located on both sides of said damping member in the front-rear direction. The vibration damper for wooden structures according to any one of claims 1 to 5 , characterized in that the connection members are joined to the joints of the damping members from both front and rear sides. The vibration damper for wooden structures according to any one of claims 1 to 6 , characterized in that the connecting member is formed of a steel pipe having a slit into which the joint of the damping member is inserted. The vibration damper for wooden structures according to any one of claims 1 to 7, characterized in that the pair of left and right connecting members and the damping member are joined together to form a unit. A vibration-damping structure for a wooden structure, characterized in that the vibration-damping damper for a wooden structure according to any one of claims 1 to 8 is arranged to span in the left-right and lateral directions between the vertical and vertical height-wise mid-points of a pair of adjacent wooden vertical members of the wooden structure. A method for producing the vibration damper for a wooden structure according to any one of claims 1 to 8, comprising the steps of:
determining values of the von Mises yield criterion for all lateral cross sections of the body and determining the curves defining the outer contour of the body based on these values.

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