JP5646392B2 - Compound damping damper - Google Patents

Description

  The present invention controls the vibration characteristics (period and mode shape) of the structure against vibrations caused by strong winds, earthquakes, etc., and suppresses the vibration, and at the same time exhibits the damping effect by energy absorption. This is related to a composite seismic damper.

  In recent years, the deformation of the structure of the structure during strong winds and earthquakes is converted into the rotational movement of the disk, and the inertial force due to the rotational inertial mass of the disk is used as a restoring force to suppress the shaking of the structure. Rotational inertial mass dampers have been developed and are being used for vibration control at various points of the structure.

  For example, as shown in FIG. 9, this rotary inertia mass damper includes a ball screw 2 whose one end is rotatably supported by a bearing 1, a disk 3 fixed to the outer periphery of the ball screw 2, and the other end of the ball screw 2. And a ball nut 4 to which the ball screw 2 is screwed. The bearing 1 is fixed to one member in a frame that causes relative displacement during an earthquake or the like, and the ball nut 4 is fixed to the other member. Is installed.

According to the rotary inertia mass damper, when a relative displacement occurs between the members during an earthquake or the like, the relative displacement is converted into a rotational motion of the ball screw 2, whereby the mass of the disk 3 is m and the radius of the disk 3 is Can be obtained, and when the lead of the ball screw 2 is L, a large rotational inertia mass ΔM represented by ΔM = 2 × m × (π × R / L) ² can be obtained. With the inertial force, response (swing) can be reduced by controlling the vibration characteristics (period and mode shape) of the structure.

  By the way, although the rotational inertia mass damper can exhibit a restoring force proportional to the relative acceleration generated in the damper, it does not have an energy absorbing function. For this reason, when the rotary inertia mass damper is used for damping a structure, a speed-dependent damper such as an oil damper, a viscous damper, a viscoelastic damper, or a displacement-dependent damper such as a friction damper or a steel damper is separately provided. It is necessary to use in combination with a damper having an energy absorption function.

  However, when the damper having the energy absorbing function is added to the rotary inertia mass damper, there is a limitation on the installation location of the damper, and in addition, the total number of dampers is increased and the cost is increased. There is.

  In Patent Document 1 below, the base isolation structure is supported by a support structure below the vertical base isolation part so that the vertical vibration of the base isolation structure becomes longer. In the seismic device, a configuration in which a rotary inertia mass damper is provided between the seismic isolation target structure and the support structure to increase the mass involved in vertical vibration by interlocking with the vertical motion of the seismic isolation target structure. It is disclosed.

JP 2004-44748 A

  The present invention has been made in view of the above circumstances, and suppresses shaking by controlling the vibration characteristics of a structure with respect to various vibrations ranging from a small amplitude to a large amplitude generated in the structure with a simple structure. It is an object of the present invention to provide a composite seismic damper that can simultaneously achieve an effect and a seismic control effect by energy absorption.

In order to solve the above-mentioned problem, the invention according to claim 1 is interposed between opposing members of a frame of a structure that generates a relative displacement by vibration, and suppresses the relative displacement and absorbs energy of the vibration. A composite vibration damper, each of which is connected to the opposing member and has a shaft member formed with a yield portion that yields due to the relative displacement caused by the earthquake, and deformation of the shaft member in the out-of-plane direction. A displacement-dependent damper having a buckling restraining member attached to the surface of the shaft member so as to be restrained and having one end connected to the shaft member and the other end being a free end. Rotational inertia that converts a relative displacement generated between the member and the free end of the buckling restraining member into a rotational motion of the disk and generates a restoring force for the relative displacement by an inertial force due to the rotational inertial mass of the disk It is provided the amount damper in parallel, and the rotational inertia mass dampers, the axis while being disposed along a extending direction of the shaft member and the buckling restraint member, one end of the shaft member side A ball screw rotatably supported by a bearing fixed to the bearing, a disk fixed to the outer periphery of the ball screw, and fixed to the free end side of the buckling restraining member to support the ball screw. A ball nut that converts axial movement into rotational motion, the shaft member is made of a flat steel material or a cross-shaped steel material, and the buckling restraining member has a surface along the surface of the shaft member. And a bracket protruding in an out-of-plane direction is fixed to the shaft member, and the rotary inertia mass damper is fixed to the bracket. Is attached to receiving said ball screw, said disc and said ball nut is characterized in that disposed inside said Rectangular steel tube.

In the first aspect of the present invention, when vibrations are applied to the structure due to strong winds or earthquakes, thereby causing relative displacement between the members of the frame, the shaft member and the free end side of the buckling restraint member are placed between them. The relative displacement occurs, and thereby the disk of the rotary inertia mass damper rotates. The vibration characteristics (cycle and mode shape) are controlled by the restoring force generated by the inertial force generated by the rotational inertial mass of the rotating disk, and the relative displacement is suppressed.

  In addition, when a vibration due to an earthquake is applied to the structure, the yield portion formed on the shaft member yields and plastically deforms to function as a hysteresis damping damper. As a result, it is possible to exert a seismic control effect that absorbs vibration energy due to hysteresis attenuation in the yield portion of the shaft member.

  As described above, according to the damping damper according to the present invention, the displacement-dependent damper functioning as the hysteresis damping damper and the rotary inertia mass damper are integrated in parallel. However, with a simple structure, with respect to the vibration generated in the structure, it is possible to achieve a vibration suppression effect by adjusting the vibration characteristics of the structure and a vibration control effect by energy absorption.

Further , a flat steel material or a cross-shaped steel material is used as the shaft member, and a member such as a ball screw, a disk, or a ball nut constituting the rotary inertia mass damper is buckled using a square steel pipe as the buckling restraining member. Since it is arranged inside the square steel pipe constituting the restraining member, the functions of the displacement-dependent damper and the rotary inertia mass damper can be exhibited by an extremely compact external shape, and the installation is further facilitated. In addition, it is possible to protect the ball screw or the disk, which is a rotating member, by covering it with a tubular buckling restraining member.

1 is a front view showing a first embodiment of a composite vibration control damper according to the present invention. It is a top view of FIG. It is a side view of FIG. It is a disassembled perspective view which shows the displacement dependence type damper of FIG. It is a longitudinal cross-sectional view of the principal part of FIG. The 2nd Embodiment of the composite damping damper which concerns on this invention is shown, and it is the front view which looked at the buckling restraint member longitudinally. FIG. 7 is a plan view of FIG. 6. FIG. 7 is a side view of FIG. 6. It is a schematic diagram which shows the conventional rotary inertia mass damper.

(First embodiment)
FIGS. 1-5 shows 1st Embodiment of the composite damping damper based on this invention, and the code | symbol 10 in a figure is a displacement dependence type damper which exhibits the function as a hysteresis damping damper.
As shown in FIGS. 4 to 5, the displacement-dependent damper 10 is generally composed of a shaft member 11 and a buckling restraining member 12.

  Here, the shaft member 11 is a cross-shaped steel material in which one end portion 11a and the other end portion 11b are connected to opposing members of a structure frame that causes relative displacement by vibration, and the end portion 11b of the shaft member 11 On the side, an elastic portion 14 having a large axial area is formed. A yield portion 15 having an axial area smaller than that of the elastic portion 14 is formed between the elastic portion 14 and the end portion 11a.

  And the said buckling restraining member 12 which consists of a square steel pipe, respectively, is arrange | positioned at the four corners of the shaft member 11 so that relative displacement is possible, and these buckling restraining members 12 are joined along the mutually adjacent part. Are connected together by a flat bar 16. As a result, each buckling restraining member 12 has a slight gap between its surface and the surface of the shaft member 11 to restrain excessive deformation of the shaft seat 11 in the out-of-plane direction. Arranged along the shaft member 11.

  Further, a bolt insertion hole 17 is formed on the end 11 b side of the shaft member 11. The buckling restraining member 12 is inserted into the bolt insertion hole 17 of the shaft member 11 and tightened with the high-strength bolt 18 inserted into the bolt insertion hole formed in the end 12a. In 12a, it is integrated with the shaft member. Thereby, as for the buckling restraining member 12, the said edge part 12a is fixed to a structure via the edge part 11b of the shaft member 11, and the other end part 12b is made into the free end.

  As shown in FIGS. 1 to 3, the outer peripheral edge of one end portion 11 a of the shaft member 11 of the displacement-dependent damper 10 having the above-described configuration projects further outward on the same surface as the shaft member 11. Thus, the rectangular plate-like bracket 19 is fixed, and the rotary inertia mass damper 20 is provided in parallel between the bracket 19 and the buckling restraining member 12.

  The rotary inertia mass damper 20 includes a ball screw 22 that is disposed along the shaft member and the buckling restraining members 11, 12 with the axis thereof being rotatably supported by a bearing 21 having one end fixed to the bracket 19, and The disk 23 fixed to the outer periphery of the ball screw and the flat bar 16 that connects the buckling restraining member 12 are supported to support the ball screw 22, and the axial movement of the ball screw 22 is incorporated into the ball screw 22. And a ball nut 24 that is converted into a rotational motion by a ball 24a that is screwed to the screw.

  Here, a plurality of ball nuts 24 (two sets in the figure) are arranged at intervals in the axial direction, and a plurality of ball nuts 24 (in the figure, the front and rear of each ball nut 24 are arranged on the outer periphery of the ball screw 22). A total of 5) disks 23 are fixed. The bracket 19 is formed with a long hole 19 a extending in the axial direction of the ball screw 22.

  A pair of mounting plates 25 are arranged on both surfaces of the bracket 19 so as to sandwich the bracket 19 therebetween, and the bearings 21 are joined to the tip portions of the mounting plates 25. A friction material 26 is interposed between the bracket 19 and the mounting plate 25.

  The friction material 26 and the mounting plate 25 are arranged in a plurality (two in the figure) at intervals in the axial direction, and bolts 27 that pass through these and are inserted into the long holes 19a of the bracket 19 are provided. When the nut is tightened with a predetermined tightening force, the bracket 19 is sandwiched.

  According to the composite seismic damper having the above configuration, the elastic member 14 and the yielding member 15 are formed on the shaft member 11, and the shaft member 11 is restrained from buckling excessively in the out-of-plane direction. Since the member 12 is attached and the rotary inertia mass damper 20 is provided between the free end 12b of the buckling restraining member 12 and the end 11a of the shaft member 11, the function of the hysteresis damping damper is exhibited. The displacement-dependent damper 10 and the rotary inertia mass damper 20 are arranged in parallel.

  As a result, when vibration is applied to the structure due to strong wind or earthquake, and relative displacement occurs between the members of the frame, the elastic portion 14 of the shaft member 11 is elastically deformed, so that the end portion 11a of the shaft member 11 and The relative displacement occurs between the buckling restraining member 12 and the free end 12b. Then, the ball screw 22 of the rotary inertia mass damper 20 advances and retreats in the axial direction with respect to the ball nut 24, and the linear motion is converted into rotational motion by the ball nut 24, so that the disc 23 rotates and thereby the disc 23 rotates. The relative displacement is suppressed by the restoring force generated by the inertial force of the rotational inertial mass.

  Next, when an earthquake occurs and the amplitude of the shaking acting on the structure increases, the yielding portion 15 of the shaft member 11 yields, and the hysteresis energy is absorbed by the hysteresis attenuation, and the shaking is reduced. To reduce.

  As a result, even in a structure where the installation location is restricted, the effect of suppressing the vibration by adjusting the vibration characteristics of the structure with the rotary inertia mass damper 20 with respect to the vibration generated in the structure with a simple structure. And a seismic control effect using energy absorption by the displacement-dependent damper 10 during an earthquake.

  At this time, a reaction force acts on the joint portion of the shaft member 11 and the frame of the structure from the rotary inertia mass damper 20 via the bracket 19. The reaction force is a tightening force of the bolt 27 and a friction material. When a predetermined value determined by the friction coefficient of 27 is exceeded, slip occurs between the bracket 19 and the mounting plate 25. Thereby, it is possible to prevent an excessive reaction force from acting on the shaft member 11 and the structure side from the rotary inertia mass damper 20.

  As described above, according to the above-described seismic damper, since the displacement-dependent damper (historically damped damper) 10 and the rotary inertia mass damper 20 are integrated in parallel, the number of installation places is limited. However, with a simple structure, the vibration suppressing effect and the vibration control effect can be simultaneously achieved with respect to the vibration generated in the structure.

  As a result, when the structure is vibrated and the frame is deformed, the rotation inertia mass damper 20 interposed between the shaft member 11 and the buckling restraining member 12 that generate relative displacement always causes a vibration suppressing effect. Can be demonstrated. For this reason, the vibration of the structure is suppressed against various vibrations from small amplitude to large amplitude generated in the structure due to strong winds, earthquakes, etc., and at the same time, the energy absorption function of the displacement-dependent damper 10 at the time of earthquake occurrence. Can also exert a vibration control effect.

(Second Embodiment)
FIGS. 6-8 shows 2nd Embodiment of the composite damping damper based on this invention, About the same component as what was shown in FIGS. 1-5, the same code | symbol is attached | subjected and the description is given. To simplify. In FIGS. 6 and 7, for the sake of visual convenience, the outer wall surface of the square steel pipe constituting the buckling restraining member 12 is omitted and the inside is shown.
In these drawings, the composite vibration damping damper according to the present embodiment is different from that shown in the first embodiment in the number of installed rotary inertia mass dampers 20 and their arrangement.

  That is, in this composite vibration control damper, a total of four sets of rotary inertia mass dampers 20 are provided in parallel with the displacement-dependent damper 10. And the bracket 19 is each fixed to the shaft member 11 in the position which protrudes in the surface direction and faces the hollow part of the square steel pipe which comprises the four buckling restraining members 12.

  Then, the mounting plate 25 is attached to each bracket 19 with the above-described bolts 27 and nuts with the friction material 26 interposed therebetween, and the bearing 21 and the disk 23 fixed to the distal end portion of the mounting plate 25 are fixed. A ball screw 22 is inserted into the square steel pipe constituting the buckling restraining member 12.

  On the other hand, a plurality of (two sets in the figure) ball nuts 24 that support the ball screw 22 and convert the linear motion into rotational motion are provided in the square steel pipe of the buckling restraining member 12 at intervals in the axial direction. Fixed.

The same effect as that shown in the first embodiment can also be obtained by the composite vibration damper having the above configuration.
In addition, according to the composite seismic damper of this embodiment, four sets of rotary inertia mass dampers 20 are displaced in the square steel pipes constituting the buckling restraining members 12 of the displacement-dependent dampers 10. Since the dependent damper 10 is provided in parallel, the resultant force of the restoring force acting from the rotary inertia mass damper 20 can be coaxially applied to the displacement dependent damper 10 in a well-balanced manner.

  In addition, since the members such as the ball screw 22, the disk 23, and the ball nut 24 that constitute the rotary inertia mass damper 20 are arranged inside the square steel pipe that constitutes the buckling restraining member 12, an extremely compact external shape Therefore, the functions of the displacement-dependent damper 10 and the rotary inertia mass damper 20 can be exhibited, and the installation becomes easier. Furthermore, it is possible to protect the ball screw 22 and the disk 23, which are rotating members, by covering them with the square steel pipe.

  In each of the first and second embodiments, the bracket 19 is provided with the long hole 19a in order to prevent an excessive reaction force from acting on the shaft member 11 and the structure side from the rotary inertia mass damper 20. The case where the mounting plate 25 of the bearing 21 is formed and attached to the bracket 19 with a predetermined tightening force of the bolt 27 and the nut via the friction material 26 is described, but the present invention is not limited to this. If the bracket 19 or the mounting plate 25 itself is formed of a yield member such as an extreme yield point steel that yields when an excessive stress is applied, the same effect can be obtained.

DESCRIPTION OF SYMBOLS 10 Displacement-dependent damper 11 Shaft member 12 Buckling restraint member 11a, 11b End part 12a One end part 12b The other end part (free end)
DESCRIPTION OF SYMBOLS 14 Elastic part 15 Yield part 19 Bracket 20 Rotation inertia mass damper 21 Bearing 22 Ball screw 23 Disk 24 Ball nut

Claims (1)

A composite damping damper that is interposed between opposing members of a frame of a structure that generates a relative displacement due to vibration, suppresses the relative displacement and absorbs energy of the vibration,
A shaft member in which each end portion is connected to the opposing member and a yield portion that yields due to the relative displacement caused by an earthquake is formed, and the shaft member is restrained from being deformed in an out-of-plane direction. A displacement-dependent damper provided with a buckling restraining member attached to the surface and having one end connected to the shaft member and the other end being a free end is provided with the shaft member and the buckling restraining member. converts the relative displacement occurring between the free end into rotational movement of the disk becomes the inertial force due to rotational inertia mass of the disc rotation inertial mass damper that causes a restoring force against the relative displacement is provided in parallel ,
The rotary inertia mass damper is arranged with its axis line along the extending direction of the shaft member and the buckling restraining member, and one end portion is rotatably supported by a bearing fixed to the shaft member side. The ball screw, a disk fixed to the outer periphery of the ball screw, and fixed to the free end side of the buckling restraining member to support the ball screw, and to convert the axial movement of the ball screw into a rotational motion With ball nuts,
The shaft member is made of a flat steel material or a cross-shaped steel material, and the buckling restraining member is a square steel pipe disposed so that the surface thereof can be relatively displaced along the surface of the shaft member.
A bracket protruding in an out-of-plane direction is fixed to the shaft member, the bearing of the rotary inertia mass damper is attached to the bracket, and the ball screw, the disk, and the ball nut are arranged inside the square steel pipe. A composite seismic damper characterized by

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