JP2000291712A - Damping structure for bolt junction part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an equal damping effect even to external force in any direction within one plane. SOLUTION: In this damping structure, an external plates 10, 12 protruding from a steel frame member on one side and a middle plate 14 protruding from a steel frame member on the other side are mutually piled up, and a high tensile bolt 16 is passed through them to fasten them with a nut 18 for generating an axial force N of the bolt. A bolt inserting hole 14a of the middle plate 14 is formed so that the external plates 10, 12 and the middle plate 14 may mutually move along their plane surfaces in all directions. A friction plate 22 formed of a composite friction material is interposed between the external plates 10, 12 and the middle plate 14. The friction plate 22 is formed of the composite friction material composed of fiber material, friction regulating material and a packing agent with thermosetting resin used as bonding agent. A coned disc spring 30 is provided as an energizing means for pressing the external plates 10, 12, the friction plate 22 and the middle plate for stabilizing frictional force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a bolted joint used for connecting steel members constituting a building frame, and effectively suppresses the vibration of the building frame caused by an earthquake, a strong wind or the like. The present invention relates to a vibration damping structure for a bolted joint that vibrates.

[0002]

2. Description of the Related Art A building frame formed by connecting steel columns and steel beams to each other is generally applied to a multi-story building, in which a brace is used as a resistance element against a horizontal force such as an earthquake or wind. Can be Steel frame members such as steel columns, steel beams and braces are joined via welding or bolts to form a ramen frame.
Particularly when bolts are joined, if an excessive horizontal force acts due to a large earthquake, strong wind, or the like, a displacement occurs at a joint portion between the joined two members even in a rigid frame frame. Then, a large frictional resistance is generated due to the displacement, and the vibrational energy due to the above-mentioned earthquake or wind is consumed by the frictional resistance, and the vibration control function of the building frame is exhibited.

FIG. 18 shows an example of the above-mentioned bolt joint.
A pair of outer plates 1 and 1a are integrally protruded from one steel frame member to be joined to each other, and a middle plate 2 is integrally protruded from the other steel frame member. The middle plate 2 is sandwiched between 1a, and the outer plates 1, 1a and the middle plate 2 are penetrated by bolts 3 and fastened by nuts 3a.
The bolt insertion hole of the middle plate 2 is formed as a long hole 4, and when an excessive relative displacement force P is input in the pulling direction or the compression direction, the relative movement between the outer plates 1 and 1a and the middle plate 2 is allowed. You.

[0004]

The external force applied to the above-mentioned vibration damping structure due to an earthquake or strong wind contains various directional components. However, in the above-mentioned vibration damping structure, the bolt insertion hole has a long length. Since the hole is formed in the hole, of the external force applied from an arbitrary direction, a component other than the component applied in the long axis direction of the long hole cannot obtain a sufficient vibration damping effect. In order to prevent this, for example, it is conceivable to install a plurality of damping structures side by side with the direction of the slots changed, but the cost and construction cost will be extra due to the increased number of damping structures to be installed In addition, the installation position must be ensured by the number of the increased vibration damping structures, and the applicable range is narrowed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a vibration damping effect at a bolted joint portion capable of obtaining an equivalent vibration damping effect against an external force from any direction in one plane. The purpose is to provide a structure.

[0006]

In order to achieve the above object, in the vibration damping structure for a bolt joint according to the first aspect of the present invention, one of two steel frame members to be joined to each other is used. A first press plate from the steel member and a second press plate from the other steel member are integrally protruded, and the first and second press plates are overlapped with each other, and the relative movement between the two press plates is performed. The relative displacement of the two steel frames is allowed by a vibration displacement force of a predetermined value or more inputted between the two pressure contact plates by adding a bolt axial force to the two steel frames. In a vibration damping structure of a bolted joint for damping between members, the first pressure contact plate is formed of a pair of outer plates facing in a direction in which a bolt axial force acts, and the second pressure contact plate is connected to the pair of outer plates. The middle plate sandwiched between the outer plates Form, the bolt insertion hole of the middle plate, the outer plate and the intermediate plate is movably formed vertically and horizontally along their plate surfaces to each other.

According to a second aspect of the present invention, there is provided a vibration damping structure for a bolt joint, wherein a bolt shaft is provided in a path for applying the bolt axial force to a portion where the outer plate and the middle plate overlap. With a biasing means provided with a non-linear spring region in which the fluctuation of the resilient force becomes substantially constant with respect to the directional displacement, and in a state where a predetermined axial force is generated in the bolt, the biasing means is driven by the non-linear spring. Set to bend and deform in the area.

According to a third aspect of the present invention, there is provided a vibration damping structure for a bolted joint according to any one of the first and second aspects. Between the middle plate, a friction plate formed of a composite friction material is interposed, and the friction plate is a thermosetting resin as a binder,
It is formed of a composite friction material comprising a fiber material such as aramid fiber, glass fiber, vinylon fiber, carbon fiber, and asbestos, a friction modifier such as cashew dust and lead, and a filler such as sulfuric acid value.

According to a fourth aspect of the present invention, there is provided a vibration damping structure for a bolted joint according to any one of the first to third aspects. One is made of a corrosion resistant material.

According to a fifth aspect of the present invention, in the vibration damping structure for a bolted joint, at least one of the outer plate and the middle plate is provided. A sliding plate made of a corrosion-resistant material is interposed between the one and the friction plate.

Further, in the vibration damping structure for a bolted joint according to claim 6 of the present invention, in the vibration damping structure according to any one of claims 3 to 5, the friction plate generates a frictional resistance force. The surface has a concave portion that dissipates frictional heat and takes in abrasion powder.

The operation of the vibration damping structure for a bolted joint according to the present invention having the above structure will be described below. In the first aspect, the first pressure contact plate is formed by a pair of outer plates facing the direction of action of the bolt axial force. In addition, the second press plate is formed by a middle plate sandwiched between the pair of outer plates, and the bolt insertion holes of the middle plate are freely formed by the first and second press plates along the friction surface. When the relative displacement force is input between the two steel members, the bolts can be inclined and smoothly move relative to each other without causing kinking. The same vibration damping effect can be obtained even with external force from the direction.

According to the second aspect, the variation of the resilient force with respect to the axial displacement of the bolt is substantially constant in the path for applying the bolt axial force to the overlapping portion of the outer plate and the middle plate. The urging means having a non-linear spring area is interposed, and the urging means is set to bend and deform within the non-linear spring area in a state where a predetermined axial force is generated in the bolt. Fluctuations in the gap between the urging means and the middle plate can be absorbed by the urging means. Even if the amount of deflection of the urging means changes due to the fluctuation absorption at this time, the urging means may be non-linear. Since the spring force is set in the spring region, the elastic force, that is, the axial force of the bolt can be maintained substantially constant.

That is, in the state where there is no vibration input, the fixed state is maintained with a large static friction force between the outer plate and the middle plate, but a small dynamic friction force is reduced from the fixed state by inputting a vibration displacement force of a predetermined value or more. When shifting to the accompanying relative movement state, a large repulsive force is generated between the respective contact surfaces,
This appears as loud noise or impact, but the repulsive force at this time can be absorbed by the urging means without changing the bolt axial force. Accordingly, the buffering action is generated by inserting the disc spring, and even when an excessive vibration force is input, it is possible to sufficiently exert the vibration damping function while suppressing the generation of sound and impact.

[0015] Further, the urging means can be used even when wear occurs on the sliding surface when the outer plate and the middle plate move relative to each other.
Since the resilience is maintained substantially constant, the frictional resistance is prevented from lowering, and the initial vibration damping function is permanently exerted.

Further, the friction plate uses a thermosetting resin as a binder, a fiber material such as aramid fiber, glass fiber, vinylon fiber, carbon fiber, asbestos, a friction adjusting material such as cashew dust and lead, and a sulfuric acid value. The friction plate can be formed as a member having a constant coefficient of friction and extremely low wear because it is formed of a composite friction material including a filler such as. Therefore, even when the outer plate and the middle plate are relatively moved, the coefficient of friction between the outer plate and the middle plate and the friction plate is always kept substantially constant, and the sound is generated smoothly without generating sound. The bolt becomes slippery, and the axial force of the bolt is kept almost constant because there is almost no wear on the sliding portion.

Therefore, the frictional resistance generated as the product of the friction coefficient and the axial force, which is generated in the relative movement portion between the outer plate and the middle plate, can be maintained substantially constant. Therefore, the damping force characteristic between the two steel members is stabilized, and the vibration damping function initially set can be maintained for a long time.

According to the present invention, at least one of the outer plate and the middle plate is made of a corrosion-resistant material, so that the sliding surface where the outer plate or the middle plate and the friction plate face each other can be corroded. Over time, and can maintain stable sliding resistance and friction coefficient (μ) over a long period of time without performing any maintenance.

According to a fifth aspect of the present invention, a sliding plate made of a corrosion-resistant material is interposed between at least one of the outer plate and the middle plate and the friction plate.
Prevents deterioration over time due to corrosion of the sliding surface where the sliding plate and the friction plate face each other, and enables stable sliding resistance and friction coefficient (μ) to be maintained over a long period without maintenance. Become.

Further, according to the present invention, the friction plate has a concave portion on its frictional resistance generating surface for dissipating frictional heat and taking in abrasion powder. By dissipating the frictional heat to the friction plate, the surface temperature of the friction plate can be prevented from rising, and the generation of wear powder due to carbonization and falling off of the friction plate surface can be prevented. Further, even if abrasion powder is generated, the abrasion powder is taken into the concave portion, so that the accumulation of the abrasion powder between the friction plate and the pressure contact plate can be prevented. As a result, the pressure contact plate is less likely to be damaged, and rolling friction of the wear powder is less likely to occur, so that the friction resistance between the friction plate and the pressure contact plate can be kept constant, and a stable vibration damping effect can be obtained. Becomes Furthermore, since the accumulation of the wear powder can be prevented, the generation of abnormal noise due to the bite of the wear powder from the sliding surface between the friction plate and the pressure contact plate can be prevented, and the noise at the time of vibration suppression can be significantly reduced. Can be reduced.

[0021]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 show an embodiment of a vibration damping structure for a bolted joint according to the present invention. FIG. 1 is a sectional view of a main part, and FIG. 2 is a plan view of the main part.

That is, as shown in FIG. 1, a bolt joint to which the vibration damping structure of the present invention is applied includes a pair of upper and lower outer plates 10 and 12 as a first pressing plate, and the pair of outer plates 10 and 12 And a middle plate 14 as a second pressure contact plate interposed therebetween.
The outer plates 10, 12 and the middle plate 14 are provided in a building frame, and are integrally protruded from one and the other of the steel members joined to each other.

The above-mentioned steel members include a steel column, a steel beam, a brace, and the like. A vertically arranged steel column and a horizontally arranged steel beam are joined to each other so as to form each side of a hexahedron. A building frame is constructed. The brace has an inclined portion and is joined between the steel columns and the steel beams adjacent to each other or between the upper and lower steel beams facing each other.
Specific examples of the joint structure between the steel column and the steel beam as a portion to which the vibration damping structure of the bolt joint of the present invention is applied,
Specific examples of the brace structure will be described later in detail.

The outer plates 10, 12 and the middle plate 14 are overlapped with each other, and a high-strength bolt 16 is passed through bolt insertion holes 10a, 12a, 14a formed respectively, and tightened with a nut 18. Has become. The tightening of the nut 18 generates an axial force N of the bolt, which is applied to the washers 20 and 20a and the large diameter washer 3.
The force is transmitted to the outer plates 10 and 12 via the inner plates 2 and 32a, and acts as a pinching force of the middle plate 14. The bolt insertion holes 14a of the middle plate 14 are sufficiently larger than the thickness of the bolt shaft as shown in FIG. 2 so that the outer plates 10, 12 and the middle plate 14 can move vertically and horizontally along their plate surfaces. The outer plate 1 is formed in a substantially circular shape having a large diameter.
0, 12 and the intermediate plate 14 are allowed to move relative to each other in any vertical and horizontal directions along their plate surfaces.

Here, in the present embodiment, the pair of outer plates 1
Friction plates 22 made of a composite friction material are interposed between 0, 12 and both surfaces of the intermediate plate 14, respectively. The friction plate 22 is made of aramid fiber, glass fiber, vinylon fiber, carbon fiber,
It is formed of a composite friction material comprising a fiber material such as asbestos, a friction modifier such as cashew dust and lead, and a filler such as sulfuric acid value. Examples of the thermosetting resin include a phenol resin, a melamine resin, a furan resin, a polyimide resin, a DFK resin, a guanamine resin, an epoxy resin, a xylene resin, a silicone resin, a diallyl phthalene resin, and an unsaturated polyester resin.

As shown in FIG. 2, the friction plate 22 has an annular shape having an inner diameter slightly larger than that of the bolt insertion hole 14a, and accommodates the bolt insertion hole 14a inside the ring. Are arranged as a pair on both sides of the. On the other hand, both surfaces of the middle plate 14 with which the friction plate 22 comes into contact are appropriately polished and finished to a smooth surface 14b, and the friction plate 22 is slidably contacted with the smooth surface 14b. Is slid with a predetermined coefficient of friction μ.

That is, the bolt joint portion is constituted as a friction damper 8 by the outer plates 10, 12 and the intermediate plate 14, the high-strength bolt 16 and the nut 18, the friction plate 22, and the like.

With the above-described structure, in the vibration damping structure for a bolted joint according to the present embodiment, the intermediate plate 14 is sandwiched between the pair of outer plates 10 and 12, and the high-strength bolt 16
When tightening the nuts 18, these outer plates 10, 12
Since the friction plate 22 is interposed between the intermediate plate 14 and
When the building frame vibrates due to an external force such as an earthquake or wind,
When the displacement force caused by the vibration exceeds a predetermined value, the outer plates 10,
The intermediate plate 12 and the intermediate plate 14 relatively move with the sliding surfaces 14b on both surfaces of the intermediate plate 14 and the friction plate 22 sliding. At this time,
The axial force N of the high-strength bolt 16 is between the middle plate 14 and the friction plate 22.
When the intermediate plate 14 and the friction plate 22 are slid, the vibration energy is converted into a frictional force R of μ × N and the vibration is It is attenuated and contributes to damping the building frame.

At this time, the friction plate 22 is made of phenol resin, melamine resin, furan resin, polyimide resin, D
Using thermosetting resin such as FK resin, guanamine resin, epoxy resin, xylene resin, silicone resin, diallyl phthalene resin, unsaturated polyester resin as binder,
Since it is formed of a composite friction material composed of fiber materials such as aramid fiber, glass fiber, vinylon fiber, carbon fiber and asbestos, friction modifiers such as cashew dust and lead, and fillers such as sulfuric acid value, the friction The plate 22 is made of a material having high hardness and high strength, and can be formed as a member having a constant coefficient of friction and extremely low wear.

Therefore, even when the outer plates 10, 12 and the middle plate 14 are relatively moved, the friction coefficient μ between the middle plate 14 and the friction plate 22 is always kept substantially constant, and the sliding portion Since there is almost no wear, the axial force N of the high-strength bolt 16 is also maintained substantially constant. Therefore, during relative movement between the outer plates 10, 12 and the intermediate plate 14, the frictional resistance R generated as a product of the friction coefficient μ and the axial force N can be maintained substantially constant. Accordingly, the friction damping force characteristic between the two steel members integral with the outer plates 10, 12 and the middle plate 14, respectively, and hence the vibration damping characteristics with respect to the vibration of the building frame are stabilized, and the initially set vibration damping characteristics are achieved. Function can be maintained for a long time.

However, if the frictional heat generated by the sliding between the friction plate 22 and the intermediate plate 14 is large, the friction plate 22
Of the friction plate is carbonized and falls off as abrasion powder, and the abrasion powder may stay on the sliding boundary surface. Since this wear powder is carbide, it has a very high hardness, and the above-mentioned sliding may damage the middle plate 14,
There is a fear that the friction coefficient may fluctuate due to rolling of the sliding boundary surface with wear powder interposed therebetween. When such a phenomenon occurs, the frictional resistance greatly changes, causing a large fluctuation in the vibration damping performance of the vibration damping structure, and there is a concern that it is difficult to obtain a stable vibration damping effect.

As a countermeasure against this, as shown in FIGS. 1 and 2, a plurality of linear grooves 21 are formed in the friction plate 22 as recesses on the sliding contact surface side with the middle plate 14 in the vertical and horizontal directions. ing. The groove 21 has a function of dissipating frictional heat generated on a surface in contact with the intermediate plate 14 where the frictional resistance of the friction plate 22 is generated, and a function of taking in and discharging abrasion powder on the surface in contact with the frictional plate. That is, by dissipating the frictional heat of the friction plate 22 during the operation of the friction damper to the air in the groove 21, the surface temperature is prevented from rising, and the carbonization of the friction plate surface and the falling off of the wear powder are prevented. Even if abrasion powder is generated, the abrasion powder is taken into the groove 21 to prevent stagnation of the abrasion powder on the sliding contact surface between the friction plate 22 and the intermediate plate 14. For this reason, the middle plate 14 is not easily damaged, and the abrasion powder is less likely to roll and slip.
The frictional resistance between the second plate 2 and the middle plate 14 can be kept constant, and a stable vibration damping effect can be obtained. Further, since the accumulation of the wear powder can be prevented, the generation of abnormal noise due to the bite of the wear powder or the like from the sliding surface between the friction plate 22 and the pressure contact plate 14 can be prevented, and the noise at the time of vibration suppression can be prevented. Can be significantly reduced.

The depth, width, cross-sectional shape and number of the grooves 21 are set in consideration of the size and amount of the generated wear powder, the surface temperature of the friction plate 22, and the like. That is, the depth, width, and cross-sectional shape are set so as to have a volume that can mainly take in the abrasion powder, and the number is set so that the surface temperature is equal to or lower than the use limit temperature of the material of the friction plate 22. In the case of the present embodiment, the cross-sectional shape of the groove 21 is rectangular, the depth thereof is half the thickness of the friction plate 22, and the number thereof can be freely set so as to satisfy the above-mentioned requirements. It may have a shape, and may penetrate in depth.

The planar shape of the groove 21 is not limited to a straight line as long as the groove 21 has a high efficiency of dissipating frictional heat and has a capacity to take in abrasion powder. It may be formed. However, from the viewpoint of heat dissipation efficiency, it is desirable that the groove 21 communicates with the open-to-atmosphere space so that air as a cooling medium can easily flow. The groove 21 is desirably formed so as to penetrate in a straight line in the vertical direction so that the abrasion powder inside is dropped and discharged by its own weight.

In this embodiment, since the sliding surface on which the frictional resistance is generated is on the side of the middle plate 14, the friction plate 22
The groove 21 is formed on the middle plate 14 side, but is not limited to this as long as it is on the sliding contact surface side. That is, the friction plate 22 is
4 and slides on the outer plates 10 and 12 to generate frictional resistance on the outer plates 10 and 12, grooves 21 may be formed on the outer plates 10 and 12 of the friction plate 22. .

In this embodiment, the first press plate is formed by the pair of outer plates 10 and 12, the second press plate is formed by the middle plate 14, and the bolt insertion hole of the middle plate 14 is formed. Since the outer plate 14a is formed in a substantially circular shape, when the relative displacement force is input between the two steel members, the outer plates 10, 12 are sandwiched between the pair of outer plates 10, 12. In addition, since the middle plate 14 is freely moved relative to each other freely in the vertical and horizontal directions along the plate surfaces, a pair of outer plates 10 and 12 are provided.
When both members slide in a state where the axial force N of the bolt 16, that is, the tightening force is applied between them, the relative movement can be smoothly performed without causing the bolt 16 to be tilted or twisting.

FIGS. 3 to 5 show another embodiment, in which the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted. 3 is a cross-sectional view of the main part, FIG. 4 is a plan view of the main part, and FIG. 5 is a spring characteristic diagram of the urging means used in this embodiment.

This embodiment is mainly different from the above-described embodiment in that the path of applying the axial force N of the high-strength bolt 16 to the outer plates 10 and 12 varies the elastic force with respect to the axial displacement of the bolt. Is provided as a friction damper 8 by interposing an urging means having a non-linear spring region in which is substantially constant.

That is, in the vibration damping structure of the bolt joint portion of this embodiment, when the intermediate plate 14 is sandwiched between the pair of outer plates 10 and 12 and the bolts 16 and the nuts 18 are tightened similarly to the above embodiment, Friction plate 22 between plates 10 and 12 and middle plate 14
The disc spring 30 as a biasing means is provided between the head 16a of the high-strength bolt 16 and one of the outer plates 10 in the bolt joint portion thus configured.
Is to be interposed.

As shown in FIG. 5, the spring characteristic A of the disc spring 30 is such that the variation of the load (resilient force) w with respect to the deformation amount (expected change amount) σ of the high-strength bolt 16 in the central axis direction. A substantially constant non-linear spring region P is provided.
Is set in the nonlinear spring region P with a predetermined axial force N applied to the high-strength bolt 16. In the present embodiment, the disc spring 30 is formed by stacking a plurality of disc springs in the same direction.

Therefore, in this embodiment, the high-strength bolt 16
The disc spring 30 is interposed between the large-diameter washer 32 on the side of the head 16a and one of the outer plates 10, so that the fluctuation of the gap between the outer plates 10, 12 and the intermediate plate 14 is changed by the disc spring 30. Can be absorbed. Even if the amount of deflection of the disc spring 30 changes due to the fluctuation absorption at this time, since the disc spring 30 is set in the non-linear spring region P, the elastic force, that is, the axis of the high-strength bolt 16 The force can be kept almost constant.

That is, in the state where there is no vibration input, the outer plates 10 and 12 and the middle plate 10 are maintained in a fixed state with a large static frictional force. When shifting to the moving state, a large repulsive force is generated between the respective contact surfaces, which appears as a loud noise or impact. However, the disc spring 3
By providing 0, the repulsive force at this time can be absorbed by the elasticity of the disc spring 30 without changing the axial force N of the high-strength bolt 16. Therefore, even when an excessive vibration force is input, the vibration control function of the building spring can be sufficiently exhibited while suppressing the generation of noise and impact by the buffering action of the disc spring 30.

The disc spring 30 has a non-linear spring region P.
, The resilient force of the disc spring 30 increases the sliding surface when the outer plates 10, 12 and the intermediate plate 14 move relative to each other, that is, the contact between the friction plate 22 and the intermediate plate 14. Even if abrasion occurs on the surface, it is possible to keep the elastic force substantially constant and prevent the frictional resistance R from decreasing. Therefore, the initial vibration damping function at the joint between the outer plates 10 and 12 and the middle plate 14 can be permanently exhibited.

In this embodiment, the disc spring 30
Between the outer plate 10 and the large-diameter washer 32 on the head 16a side of the high-strength bolt 16, that is, one side of the outer plates 10 and 12, has been disclosed. Instead, as shown in FIG. 6, both sides of the outer plates 10 and 12,
Disc springs 30 may be interposed between the outer plates 10, 12 and the large diameter washers 32, 32a on the head 16a side and the nut 18 side of the high-strength bolt 16, respectively. Further, the friction plate 22 is not limited to an annular shape, and may have a shape having a circular hole at the center equal to the diameter of the bolt shaft. Although not shown, the disc spring 30 is connected to the other outer plate 12 and the nut 18.
It can also be interposed only between the large diameter washer 32a on the side.

Further, the combination arrangement of the disc springs constituting the disc spring 30 is not limited to a plurality of disc springs laminated in the same direction as shown in the present embodiment. Various changes and combinations can be made as long as the setting required for the spring 30 is possible.
For example, a single disc spring may be used, a plurality of disc springs may be stacked in parallel, or the stacking direction may be alternately reversed.

Further, in this embodiment, the case where the disc spring 30 is used as the urging means has been disclosed. However, the present invention is not limited to this, and the variation in the elastic force with respect to the axial displacement of the bolt becomes substantially constant. Any spring having a spring region may be used.

In each of the above embodiments, the friction plate 22
Is configured to slide between the friction plate 22 and the outer plates 10 and 12 or between the friction plate 22 and the intermediate plate 14 and between the friction plate 22 and the outer plate 10. , 1
A configuration that slides both between the two is also possible.

In each of the above embodiments, the sliding surface of the middle plate 14 or the outer plates 10, 12 is a smooth surface 14b, and the friction plate 22 is slidably contacted with the smooth surface 14b. In this case, the smooth surface 14 of the middle plate 14 or the outer plates 10 and 12
The uniformity of b may be impaired, which may cause a problem such as generating a loud friction sound or an impact during sliding.

This problem can be solved by employing a corrosion-resistant material such as stainless steel or titanium for the middle plate 14 or the outer plates 10 and 12, for example. Further, a sliding plate made of a corrosion-resistant material such as stainless steel or titanium may be interposed on the sliding surface 14b between the intermediate plate 14 or the outer plates 10 and 12 and the friction plate 22. In this way, the amount of corrosion-resistant material used can be minimized, and material costs can be saved, leading to economical design.

In the above-described vibration damping structure of sliding between the middle plate 14 and the friction plate 22, the sliding surface 1 of the middle plate 14
FIG. 8 shows a configuration example in which a stainless steel sliding plate S having a circular hole in the center as shown in FIG. 7 is interposed in 4b. On the other hand, the outer plates 10 and 12 and the friction plate 22
FIG. 10 shows a configuration example in which a sliding plate S made of stainless steel having a circular hole in the center as shown in FIG. 9 is interposed on the sliding surfaces of the outer plates 10 and 12 in the method of sliding between the sliding plates S and S. Show. Further, a configuration using a disc spring as described above is also possible, and a configuration example in this case is shown in FIGS. Further, in order to smoothly slide, the surface on the sliding side of the sliding plate S may be subjected to any one or a plurality of treatments such as rolling, polishing / grinding, blasting, and painting to make the surface roughness uniform. Also, the surface of the sliding plate S opposite to the surface on which it slides, that is, the opposite middle plate 14 or outer plate 1
The contact surface with 0, 12 does not slip relative to the middle plate 14 or the outer plates 10, 12 during sliding,
Apply one or more coatings to the surface (for example, friction coating for stainless steel), adhesive bonding, blasting / grinding, welding, bolting, screwing, etc. with the intention of increasing surface roughness Should be applied.
Further, as described above, the middle plate 14 or the outer plates 10, 12
In the case where is made of a corrosion resistant material,
4 or the outer plates 10 and 12. Further, in order to make maintenance free, the sliding plate S and the middle plate 1 are used.
4. A surface treatment such as applying a rust preventive paint to the surfaces of the outer plates 10 and 12 may be performed.

FIG. 13 shows a joint between a steel column and a steel beam to which one of the objects to which the vibration damping structure for a bolt joint of the present invention is applied. As shown in the figure, generally, the steel column 52 and the steel beam 54 are formed of H-shaped steel to form a frame.
At the beam connecting portion of the steel column 52, a bracket 55 obtained by cutting the same H-shaped steel as the steel beam 54 into a short length is welded and integrated, and the connection end of the steel beam 54 is joined to the bracket 55. In the illustrated example, the bracket member 55 is welded to the surface of the flange 52a of the steel column 52, and straddles between both side flanges 52a, 52b of the steel column 52 corresponding to the positions of the upper and lower flanges 55a, 55b of the bracket member 55. The stiffener 57 is welded.

The connection end of the steel beam 54 is abutted against the tip of the bracket 55, and the upper flanges 54a and 55a and the lower flanges 54b and 55b of the steel beam 54 and the bracket 55 which correspond to each other, and
Attached plates 58, 59 are disposed on both sides of both parts of the webs 54c and 55c so as to straddle between the two members. The nuts 18 are screwed and fastened to the high-strength bolts 16 passing therethrough, whereby the steel beam 54 And the bracket member 55, that is, the steel column 52, are joined.

Here, at the joint between the steel column 52 and the steel beam 54, the vibration damping structure of the present invention uses the upper flange 5.
4a and 55a, and the lower flanges 54b and 55b, as well as the bolt joints of the webs 54c and 55c. That is, the attachment plates 58 and 59 correspond to the outer plates 10 and 12, and the upper and lower flanges 54 a and 54 b and the web 54 c of the steel beam 54 correspond to the middle plate 14. The friction damper 8 has a function of attenuating the horizontal vibration input to the building frame.

FIG. 14 shows the upper flanges 54a and 55a.
FIG. 9 shows a state where the vibration damping structure according to the second embodiment of the present invention is incorporated by taking an example of a joint portion with the above. As shown in the figure, the attachment plates 58 and 59 are securely fastened and fixed to the bracket member 55 via high-strength bolts 16 and nuts 18 (this portion may be welded).
8, 59 and the upper flange 54a.
2 is made slidable, and a frictional force is generated between the three members by the axial force of the high-strength bolt 16.

That is, in the friction damper 8, the end of the upper flange 54a of the steel beam 54 is used as a sliding plate. 54a and the attachment plate 58,
The bolt insertion holes 14a are formed so that the bolts 59 can move vertically and horizontally along their plate surfaces, so that the steel beam 54 and the bracket member 55 can move relative to each other in any vertical and horizontal directions along their plate surfaces. Movement is allowed. The high-strength bolt 16 is provided with a disc spring 30 as a biasing means for applying a pressing force between the attachment plates 58, 59, the friction plates 22, 22, and the upper flange 54a.

FIGS. 15 and 16 show an example in which the vibration damping structure for a bolted joint according to the present invention is applied to a brace. The friction damper 8 is interposed while the middle of the brace 60 is cut off. It is like that. Also in the illustrated example, the friction damper 8 is provided with a pair of outer plates 10 and 1.
2, the friction plates 22, 22, the middle plate 14, and a disc spring 30 as a biasing means.

That is, the outer plates 10 and 12 are attached to one end 60a where the brace 60 is cut, and the other end 60b where the brace 60 is cut is used as the middle plate 14 to form a pair of outer plates. Friction plate 2 between 10 and 12
Brace end 60b as intermediate plate 14 via 2, 22
Is sandwiched. At this time, in the illustrated example, the outer plate 10,
Reference numeral 12 is formed to be slightly narrower than the brace 60, and is connected to the end portion 60a by a bolt and a nut (or may be welded). Further, a disc spring 30 is inserted around the outer periphery of the high-strength bolt 16 for tightening which passes through the outer plates 10 and 12 through the bolt insertion holes 14a of the middle plate 14, and the large diameter washer 32 and the outer plate 1
0.

FIG. 17 shows an example of a case where the bolt damping structure according to the present invention is installed in a building. The floor 70a on the upper floor and the floor 7 on the lower floor are mutually parallel in the building.
0b between the friction damper 8 according to the present invention and the rigid rod 72a,
It is installed via 72b. Here, the friction damper 8 is installed such that its sliding surfaces, that is, the plate surfaces of the outer plates 10, 12 and the intermediate plate 14, are parallel to the floor surfaces of the upper floor 70a and the lower floor 70b. Therefore, when a relative displacement force is input between the floor 70a on the upper floor and the floor 70b on the lower floor, the relative displacement force is transmitted to the friction damper 8 via the rigid bars 72a and 72b, and a pair of Middle plate 1 between outer plates 10 and 12
4 with the outer plates 10 and 12 and the intermediate plate 14
Are freely moved relative to each other freely in the vertical and horizontal directions along their plate surfaces.
When the two members slide in a state in which the tightening force is applied, the bolts 16 can be smoothly moved relative to each other without being twisted due to inclination or the like. By absorbing the relative displacement force between the first floor 70a and the lower floor 70b, the vibration control function is effectively performed.

[0059]

As described above, in the vibration damping structure for a bolted joint according to the first aspect of the present invention, the first pressure contact plate is formed by a pair of outer plates facing the direction of action of the bolt axial force. In addition, the second press-contact plate is formed by a middle plate sandwiched between the pair of outer plates, and the bolt insertion holes of the middle plate are vertically and horizontally aligned with each other by the outer plate and the middle plate. When a relative displacement force is input between the two steel members, the bolts can be inclined and smoothly move relative to each other without being twisted, and in any direction in one plane. The same vibration damping effect can be obtained with respect to external force from

In the vibration damping structure for a bolt joint according to a second aspect of the present invention, a bolt shaft is provided in a path for applying the bolt axial force to a portion where the outer plate and the middle plate overlap. With a biasing means provided with a non-linear spring region in which the fluctuation of the resilient force becomes substantially constant with respect to the directional displacement, and in a state where a predetermined axial force is generated in the bolt, the biasing means is driven by the non-linear spring. Since it is set to bend and deform in the region, the fluctuation of the gap between the outer plate and the middle plate can be absorbed by the urging means, and the amount of deflection of the urging means is absorbed by the fluctuation absorption at this time. Is changed in the non-linear spring region, the elastic force, that is, the axial force of the bolt can be maintained substantially constant.

Therefore, the repulsive force generated when the outer plate and the intermediate plate move relative to each other by inputting a vibration displacement force equal to or greater than a predetermined value is absorbed by the urging means without changing the bolt axial force, and the sound is absorbed. It is possible to sufficiently exhibit the vibration damping function while suppressing the occurrence of shocks and shocks. Further, since the elastic force of the urging means can maintain the elastic force substantially constant even when the sliding surface when the outer plate and the middle plate relatively move is worn,
It is possible to prevent the frictional resistance from lowering and to permanently exert the initial vibration damping function.

In a vibration damping structure for a bolt joint according to a third aspect of the present invention, the friction plate is made of aramid fiber, glass fiber, vinylon fiber, and thermosetting resin as a binder.
Since it was formed of a composite friction material consisting of fiber materials such as carbon fiber and asbestos, friction modifiers such as cashew dust and lead, and fillers such as sulfuric acid value,
The friction plate can be formed as a component with a certain coefficient of friction and extremely low wear.

Therefore, when the outer plate and the intermediate plate move relative to each other, the coefficient of friction between the outer plate or the intermediate plate and the friction plate can always be kept substantially constant, and
Since the axial force of the bolt can be maintained almost constant while the wear of the sliding portion is almost eliminated, the frictional resistance obtained as the product of the friction coefficient and the axial force can be maintained substantially constant. Therefore, the friction damping force between the two steel members is stabilized, and thus the originally set vibration damping function can be maintained for a long time.

In the vibration damping structure for a bolt joint according to a fourth aspect of the present invention, at least one of the outer plate and the middle plate is made of a corrosion-resistant material. Prevents deterioration over time due to corrosion of the sliding surface where the middle plate and friction plate face each other, and maintains stable sliding resistance and friction coefficient (μ) over a long period of time without any special maintenance. become.

Further, in the vibration damping structure for a bolted joint according to claim 5 of the present invention, a material having corrosion resistance is provided between at least one of the outer plate and the middle plate and the friction plate. Since the sliding plate is interposed, deterioration over time due to corrosion of the sliding surface where the sliding plate and the friction plate face each other can be prevented, and stable sliding resistance and friction coefficient (μ) stable over a long period without any maintenance. Can be maintained. In addition, the amount of corrosion-resistant material used can be minimized, and material costs can be saved, leading to economical design.

In the vibration damping structure for a bolted joint according to a sixth aspect of the present invention, the frictional resistance generating surface of the friction plate has a concave portion for dissipating friction heat and taking in abrasion powder. Accordingly, when the friction damper is operated, the frictional heat is dissipated to the air in the concave portion, thereby preventing an increase in the surface temperature of the friction plate, and preventing the generation of wear powder due to carbonization and falling off of the friction plate surface. Further, even if abrasion powder is generated, the abrasion powder is taken into the concave portion, so that the accumulation of the abrasion powder between the friction plate and the pressure contact plate can be prevented. For this reason, the press contact plate is not easily damaged, and the rolling and sliding of the abrasion powder is also unlikely to occur, so that the frictional resistance between the friction plate and the press contact plate can be kept constant. As a result, a stable vibration damping effect can be obtained. It becomes possible. Further, it is possible to prevent the generation of abnormal noise from the sliding surface between the friction plate and the pressure contact plate due to stagnation of the abrasion powder, and it is possible to significantly reduce noise during vibration suppression.

Further, since the generation of abrasion powder is suppressed more than the above, damage to the friction plate and the press contact plate is remarkably reduced, so that periodic replacement is unnecessary and maintenance-free operation becomes possible.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of a vibration damping structure for a bolt joint according to the present invention.

FIG. 2 is a plan view of a main part showing an embodiment of a vibration damping structure for a bolt joint according to the present invention.

FIG. 3 is a sectional view of a main part showing another embodiment of a vibration damping structure for a bolt joint according to the present invention.

FIG. 4 is a plan view of a main part showing another embodiment of a vibration damping structure for a bolt joint according to the present invention.

FIG. 5 is a spring characteristic diagram of an urging means used in another embodiment of the vibration damping structure for a bolted joint according to the present invention.

FIG. 6 is a sectional view of a main part showing still another embodiment of a vibration damping structure for a bolt joint according to the present invention.

FIG. 7 is a plan view of a stainless steel plate used in the vibration damping structure of a bolt joint according to the present invention.

FIG. 8 is a sectional view of a main part showing still another embodiment of the vibration damping structure for a bolted joint according to the present invention.

FIG. 9 is a plan view of a stainless steel plate used for the vibration damping structure of a bolt joint according to the present invention.

FIG. 10 is a sectional view of a main part showing still another embodiment of a vibration damping structure for a bolt joint according to the present invention.

FIG. 11 is a sectional view of a main part showing still another embodiment of the vibration damping structure for a bolted joint according to the present invention.

FIG. 12 is a cross-sectional view of a main part showing still another embodiment of a vibration damping structure for a bolted joint according to the present invention.

FIG. 13 is a front view showing an example of a case where the vibration damping structure of a bolt joint according to the present invention is applied to a joint between a steel column and a steel beam.

FIG. 14 is a sectional view showing a main part of FIG.

FIG. 15 is a front view showing an example in which the vibration damping structure for a bolted joint according to the present invention is applied in the middle of a divided brace.

FIG. 16 is a side view of FIG.

FIG. 17 is a sectional view of a main part showing still another embodiment of the vibration damping structure for a bolted joint according to the present invention.

FIG. 18 is a sectional view showing a conventional bolt joint.

[Explanation of symbols]

 Reference Signs List 8 friction damper 10, 12 outer plate (first pressure contact plate) 14 middle plate (second pressure contact plate) 16 high-strength bolt 18 nut 20 friction damper 22 friction plate 30 disc spring (biasing means) 32, 32a large diameter washer ( Tightening part) 52 Steel column 54 Steel beam

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J034 BA08 3J048 AA02 AC01 BC05 BD01 BE12 DA03 3J066 AA26 BA01 BB01 BB04 BC03 BD05 BE05

Claims (6)

[Claims] 1. A first pressure contact plate from one steel member and a second pressure contact plate from the other steel member are integrally protruded from two steel members to be joined to each other. , The second pressing plates are overlapped with each other, and the two pressing plates can be relatively moved to each other to apply a bolt axial force.
In the vibration damping structure of the bolt joint portion, the relative movement of the two is allowed, and the frictional force generated at this time damps the two steel members.
The press contact plate is formed by a pair of outer plates facing in the direction of action of the bolt axial force, and the second press contact plate is formed by a middle plate sandwiched between the pair of outer plates, and a bolt insertion hole of the middle plate is formed. Wherein the outer plate and the middle plate are formed so as to be movable vertically and horizontally along their plate surfaces. 2. A path for applying the axial force of the bolt to a portion where the outer plate and the intermediate plate overlap each other includes a non-linear spring region in which a change in elastic force with respect to an axial displacement of the bolt is substantially constant. The biasing means is configured to bend and deform within the non-linear spring region in a state where a predetermined axial force is generated in the bolt with the biasing means interposed therebetween. Bolt joint vibration control structure. 3. A friction plate formed of a composite friction material is interposed between the outer plate and the middle plate, and the friction plate is formed of aramid fiber, glass fiber,
Fiber materials such as vinylon fiber, carbon fiber and asbestos, and friction modifiers such as cashew dust and lead,
3. The vibration damping structure for a bolted joint according to claim 1, wherein the vibration damping structure is formed of a composite friction material including a filler such as sulfuric acid value. 4. The vibration damping structure for a bolted joint according to claim 1, wherein at least one of the outer plate and the middle plate is made of a corrosion-resistant material. 5. A sliding plate made of a corrosion-resistant material is interposed between at least one of the outer plate and the middle plate and the friction plate. The vibration damping structure of the bolt joint described. 6. The friction plate has a frictional resistance generating surface,
The vibration damping structure for a bolted joint according to any one of claims 3 to 5, further comprising a concave portion that dissipates frictional heat and takes in abrasion powder.