JP2017122372A - Rope connection vibration control structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rope connection vibration control structure which is applicable even in the case where a distance between structures is relatively long, and which can achieve vibration control between the structures without using a power supply.SOLUTION: A rope connection vibration control structure at least includes: two structures 1, 2; and a connection device C for connecting the structures 1, 2. The connection device C includes: a rope 3; and a holding device 4 for holding the rope 3 in a freely winding/unwinding manner in a state where a tensile force is added. In the rope 3, one end is fixed to one structure 1 and the other end (tip) is connected to one end of the holding device 4, and in the holding device, one end is connected to the other end of the rope 3, and the other end is fixed to the other structure 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rope connection damping structure.

  For damping high-rise buildings, a damping device using mass inertia is effective. This vibration control device is called a dynamic vibration absorber in the mechanical engineering field, and is called TMD (tuned mass damper) or AMD (active mass damper) or HMD (hybrid mass damper) in the field of construction and civil engineering. Swing damping has been mainly used for the purpose. Since this damping device uses the inertial force of the mass as a damping force, it is necessary to place a huge mass on the rooftop floor or near the rooftop floor to cope with a large earthquake. If it breaks, it is dangerous and the cost of the device is high.

  On the other hand, Patent Document 1 below discloses a “building connection vibration control method” as a new method for controlling the shaking of a high-rise building caused by a large earthquake or wind. This technology has been put into practical use to control the vortex-induced vibrations of the three high-rise buildings of the Triton Tower constructed in Harumi, Tokyo. However, this technology requires preparation of equipment installation from the building design stage. There is a problem that it cannot be added to other buildings. In addition, since the natural frequencies of the buildings of the same height are close to each other, there is a problem that the effect of building connection vibration control is weak.

  Patent Document 2 listed below discloses a structure damping structure that solves the problems of the above-described patent technology. This vibration damping structure connects a pair of structures at portions having different vibration amplitudes, and even a structure having the same vibration characteristic can obtain a sufficient vibration damping effect.

Japanese Patent No. 3060068 Japanese Patent No. 5251936

  By the way, the techniques disclosed in Patent Documents 1 and 2 need to be adjacent to each other at a relatively short distance, and cannot be applied when the distance between the structures is long. Moreover, since the technique of patent document 1 employs an active method such as an electromagnetic actuator or an AC motor in order to enhance the vibration control effect, it is applied when power is cut off due to a large earthquake or when there is no power source nearby. I can't.

  The present invention has been made in view of the above-described circumstances, and is applicable to a case where the distance between structures is relatively long, and realizes vibration suppression between structures without using a power source. It is intended.

  In order to achieve the above object, in the present invention, as a first solving means related to a rope coupling damping structure, the apparatus comprises at least two structures and a coupling device that couples the structures. A means is provided that includes a rope and a holding device that holds the rope so that the rope can be fed out in a tensioned state.

  In the present invention, as the second solving means relating to the rope connection damping structure, in the first solving means, the connecting device connects the different heights to each other in the structure.

  In the present invention, as the third solving means relating to the rope coupling damping structure, in the first or second solving means, a means is provided in which a plurality of the coupling devices are provided between a pair of the structures. To do.

  In the present invention, as a fourth solving means related to the rope connection damping structure, in the first to third solving means, the holding device is provided only on one end side of the rope. adopt.

  In the present invention, as a fifth solving means related to the rope connection damping structure, in any one of the first to fourth solving means, the holding device includes a pulley around which the rope is wound, and the pulley. A means is provided that includes tension applying means for applying tension to the leading end of the drawn-out rope.

  In the present invention, as the sixth solving means relating to the rope coupling damping structure, in the fifth solving means, means in which the tension applying means is a weight provided at the tip of the rope.

  In the present invention, as a seventh solving means relating to the rope coupling damping structure, in the fifth solving means, one end of the tension applying means is connected to the tip of the rope and the other end is connected to the structure. Adopting the means of being a spring.

  In the present invention, as an eighth solving means relating to the rope connection damping structure, a means is adopted in which a braking motor is incorporated in the pulley in the seventh solving means.

  In the present invention, as a ninth solving means relating to the rope coupling damping structure, a means in which a vibration attenuator is provided at the tip of the rope in the fifth solving means is adopted.

  In the present invention, as a tenth solving means related to the rope coupling damping structure, a means is provided in the fifth solving means, comprising a brake for restricting movement of the tip of the rope.

  According to the present invention, since the connecting device includes the rope and the holding device, it is possible to realize a vibration damping structure that is applicable even when the distance between the structures is relatively long and does not require a power source.

It is a mimetic diagram showing the basic composition of the rope connection damping structure concerning one embodiment of the present invention. It is a 1st schematic diagram which shows the detailed structure of the damping device 4 in one Embodiment of this invention. It is a 2nd schematic diagram which shows the detailed structure of the damping device 4 in one Embodiment of this invention. It is a 3rd schematic diagram which shows the detailed structure of the damping device 4 in one Embodiment of this invention. It is a 1st schematic diagram which shows the installation aspect of the rope connection damping structure which concerns on one Embodiment of this invention. It is the 2nd schematic diagram which shows the installation aspect of the rope connection damping structure which concerns on one Embodiment of this invention, and the schematic diagram which shows the structure of a damper. It is a schematic diagram which shows the vibration model of the rope connection damping structure which concerns on one Embodiment of this invention. It is a 1st characteristic view which shows the numerical analysis result of the rope connection damping structure which concerns on one Embodiment of this invention. It is a 2nd characteristic view which shows the numerical analysis result of the rope connection damping structure which concerns on one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the rope connection damping structure according to the present embodiment is a structure in which a pair of structures 1 and 2 are connected via a rope 3 and a holding device 4. More specifically, in this rope-coupled damping structure, one end is fixed to one structure 1, the other end (tip) is connected to one end of the holding device 4, and one end is the other end of the rope 3. And a holding device 4 having the other end fixed to the other structure 2.

  The pair of structures 1 and 2 are building structures having a predetermined height. These structures 1 and 2 are high-rise buildings constructed on the ground at a certain distance from a city, for example. Among the pair of structures 1 and 2, one structure 1 is provided with a fastening portion 1 a for connecting one end of the rope 3 to a predetermined position in the height direction. A support portion 2a for supporting the other end of the holding device 4 is provided at a predetermined position in the height direction.

  The rope 3 has a tensile strength that does not break when one structure 1 and the other structure 2 are shaken by an earthquake having an assumed seismic intensity. For example, the rope 3 is made of steel wire or carbon fiber. It is a stranded wire obtained by twisting a plurality of wires. One end of the rope 3 is connected to the fastening portion 1 a provided on one structure 1.

  The rope 3 will be described in more detail. For example, seven strands (steel wires) having a diameter of about 10 mm are twisted to form a structure called a strand, and for example, about 20 strands are bundled with a predetermined cladding tube. It is coated. The said cladding tube is formed, for example from resin etc., and is for preventing the corrosion of a strand.

  The holding device 4 is a device that is provided on the other structure 2 and holds the other end (tip) of the rope 3 so that the rope 3 can be fed out in a tensioned state. That is, in the rope connection damping structure according to the present embodiment, one end of the rope 3 is a fixed end connected to the fastening portion 1a of the structure 1, and the other end of the rope 3 is held by the holding device 4 so as to be freely drawn out. It is a movable end. In addition, the holding device 4 is provided only on the other end side (one end side) of the rope 3 in order to simplify the structure of the rope coupling damping structure to the minimum necessary.

  Such a holding device 4 and the rope 3 are provided so as to pass between a pair of structures 1 and 2, and a connecting device C that couples the pair of structures 1 and 2 so as to be capable of vibration control. Is configured. That is, the rope connection damping structure according to the present embodiment includes a pair of structures 1 and 2 and the connection device C, and the connection device C includes the rope 3 and the holding device 4.

  2 to 5 are schematic views showing the detailed structure of the holding device 4. A holding device 4 </ b> A shown in FIG. 2A is configured by a pulley 5 around which a portion of the rope 3 is hung and a weight 6 fixed to the other end of the rope 3. The pulley 5 is a connecting tool that changes the extending direction of the other end side of the rope 3 from the horizontal direction, that is, the facing direction of the pair of structures 1 and 2 to the vertical direction and engages the rope 3 so as to be freely extended. On the other hand, the weight 6 has a predetermined mass (weight) and causes gravity based on the mass to act on the other end of the rope 3 that is pulled out of the pulley 5 and hangs down.

  In such a holding device 4A, tension is applied to the other end (tip) of the rope 3 by gravity acting on the weight 6, and the rope 3 can be fed out by the pulley 5 (that is, the height position of the other end of the rope 3). Can be changed). That is, the holding device 4 uses the gravity acting on the weight 6 to hold the rope 3 so that it can be fed out in a tensioned state. The weight 6 is a tension applying means in such a holding device 4A.

  A holding device 4B shown in FIG. 2B is obtained by connecting the other end of the rope 3 to the structure 2 via a spring 7 and a mounting base 8 instead of the weight 6. That is, in the holding device 4B, the other end of the rope 3 is connected to one end of the spring 7 and the other end of the spring 7 is connected to the mounting base 8 fixed to the structure 2. The spring 7 is a coil spring having a spring constant kf. In such a holding device 4B, tension is applied to the other end of the rope 3 by utilizing the elastic force of the spring 7. The spring 7 is a tension applying unit in the holding device 4B. In the holding device 4B, the tension applied to the other end of the spring 7 can be adjusted by changing the height direction position of the mounting base 8 with respect to the structure 2.

  A holding device 4C shown in FIG. 3 is obtained by incorporating a braking motor 9 into the pulley 5 of the holding device 4B. The braking motor 9 is incorporated in the pulley 5 so that the rotating shaft of the armature A is coaxial with the rotating shaft of the pulley 5, and the armature A, the field coil F, and the variable resistor R form a closed circuit. Forming. Such a brake motor 9 functions as a generator by the rotation of the armature A.

  In other words, in the braking motor 9, torque (braking torque) that attempts to stop the rotation of the armature A when the armature A (that is, the pulley 5) rotates and a current flows through the closed circuit acts on the armature A. To do. In such a holding device 4 </ b> C, tension is applied to the rope 3 by the braking torque of the braking motor 9 in addition to the elastic force of the spring 7. That is, the spring 7 and the braking motor 9 are tension applying means in the holding device 4C.

  Since the magnetic force generated by the field coil F is changed by the current flowing through the closed circuit, the braking torque can be variably set by adjusting the resistance value of the variable resistor R. Therefore, in the holding device 4C, the tension applied to the rope 3 can be easily set. Note that a side brake device that sandwiches the pulley 5 may be used instead of the brake motor 9.

  A holding device 4D shown in FIG. 4A is obtained by connecting a damper 10 (vibration attenuator) in parallel to the spring 7 of the holding device 4B. The damper 10 has a damping coefficient Cf, and absorbs and attenuates the kinetic energy at the other end of the rope 3. That is, the holding device 4D uses the damping function of the damper 10 for braking the other end (tip) of the rope 3 in addition to the elastic function of the spring 7.

  A holding device 4E shown in FIG. 4B is obtained by adding a brake 11 to the holding device 4B. By slidably contacting the part near the other end of the brake 11, a braking force that restricts the movement (vertical movement) of the part near the other end is applied. Such a holding device 4 </ b> E uses the braking force of the brake 11 for braking the other end of the rope 3 in addition to the elastic function of the spring 7.

  Such a rope-coupled vibration damping structure connects the predetermined height portions of the pair of structures 1 and 2 via any one of the holding devices 4A to 4E and the rope 3, thereby the pair of structures 1, When 2 is shaken by an earthquake, one reaction force is applied to the other. In other words, one structure 1 is damped by the reaction force caused by the vibration of the other structure 2 acting via the rope connection damping structure, and the other structure 2 is damped by the one structure 1. The reaction force caused by the vibration of the actuator is controlled by acting through the rope-coupled vibration control structure.

  Here, when the pair of structures 1 and 2 have the same vibration characteristics, that is, when they have the same natural frequency because they have the same shape and height, Since the structures 1 and 2 swing in the same manner, the reaction force cannot be obtained. In general, it is very rare for a pair of adjacent structures 1 and 2 to have the same vibration characteristics, but in the case of a pair of structures 1 and 2 referred to as a so-called “twin tower”. May have the same vibration characteristics.

  FIG. 5 is a schematic diagram showing an installation mode of a rope-coupled vibration control structure that can generate the reaction force for a pair of structures 1 and 2 having the same vibration characteristics. The installation mode of the rope connection damping structure shown in FIG. 5A is an installation mode when the holding device 4F in which the damper 12 (vibration attenuator) is connected in series to the weight 6 of the holding device 4A is used. The installation mode of the rope connection damping structure shown in FIG. 5B is an installation mode when the holding device 4G in which the damper 12 is connected in series to the spring 7 of the holding device 4B is used. That is, the installation mode of FIG. 5 connects different heights in the pair of structures 1 and 2 with the connecting device C.

  5 (a) and 5 (b) are provided with two (one set) rope-coupled vibration control structures, and each end of the rope-coupled vibration control structure has different heights for the pair of structures 1 and 2. Install so that they are connected to each other. That is, in this installation mode, one end of the rope 3 in one rope-coupled damping structure is connected to the fastening portion 1a provided at the height h1 of the one structure 1 and one rope-coupled damping structure. In the other structure 2, the pulley 5 of the holding device 4A is supported by a support portion 2a provided at a height h2 different from the height h1. In this installation mode, one end of the rope 3 in the other rope connection damping structure is connected to the fastening portion 2b provided at the height h1 of the other structure 2, and the other rope connection damping structure. The pulley 5 of the holding device 4A is supported by the support portion 1b provided at the height h2 in one structure 1.

  According to this installation mode, both ends of the two rope-coupled damping structures are connected to different height portions of the pair of structures 1 and 2, that is, the pair of structures 1 and 2 sway. Since both ends are connected to portions where the displacements are different from each other, it is possible to obtain a reaction force that can control the vibration of the pair of structures 1 and 2.

  FIG. 6 shows an installation mode in which a plurality of rope connection damping structures of FIG. 5A are provided between a pair of structures 1 and 2. That is, in this installation mode, as one example, a total of seven (1 to 4 structures and 3 to 3 structures) coupling devices C are provided in order to consider the influence of torsion. In the installation mode shown in FIG. 6A, a plurality of rope connection damping structures are provided so as to be arranged at predetermined intervals in a direction (horizontal direction) orthogonal to the opposing direction of the pair of structures 1 and 2. Further, as shown in FIG. 6B, the plurality of rope-coupled damping structures are provided at the same height in the height direction.

  According to such an installation mode, since a plurality of rope connection damping structures are provided, each set of rope connection damping structures can be reduced in size, and any pair of rope connection damping structures can malfunction. However, since other sets of rope-coupled damping structures exhibit a damping function, it is possible to ensure robustness and redundancy of the damping function. Moreover, according to such an installation mode, when viewed from above or below the pair of structures 1 and 2, a plurality of rope connection damping structures are arranged at equal intervals, so that the building structure of a new design It becomes a thing.

  Here, in the installation mode shown in FIG. 6, it is possible to reduce the size of the rope connection damping structure of each set, that is, to reduce the size of the damper 12 used in each rope connection damping structure. That is, it is possible to employ a magnetic damper 12 or a friction damper 12A as shown in FIGS. 6C and 6D as the damper structure.

  That is, as the magnetic damper 12, one having a copper plate 12a fixed to the rope 3 and a pair of permanent magnets 12b and 12c (rare earth magnet) fixed to the structure 1 or the structure 2 so as to sandwich the copper plate 12a is used. It is possible. According to such a magnetic damper 12, when the copper plate 12a moves up and down due to the swing of the pair of structures 1 and 2, an eddy current is induced in the copper plate 12a. Power) acts on the rope 3.

  Further, instead of such a magnetic damper 12, a copper plate 12a fixed to the rope 3 and a pair of friction plates 12d and 12e fixed to the structure 1 or the structure 2 so as to slide with the copper plate 12a are provided. A friction damper 12A may be used. According to the friction damper 12A, when the copper plate 12a moves up and down due to the swing of the pair of structures 1 and 2, the copper plate 12a slides on the friction plates 12d and 12e, so that the copper plate 12a moves up and down. A force (braking force) that suppresses the pressure acts on the rope 3.

  Since the magnetic damper 12 and the friction damper 12A can always generate a constant damping force without being affected by the environmental temperature, a constant damping action can be expected regardless of summer and winter. As described above, the magnetic damper and the friction damper may be used in combination instead of being used alternatively. That is, the magnetic damper 12 and the friction damper 12A may be connected in series to the rope 3. In this way, when the magnetic damper 12 and the friction damper 12A are used in combination, a larger braking force can be expected than when the magnetic damper 12 and the friction damper 12A are used alternatively.

  Next, the effect of the rope connection damping structure configured as described above will be described in detail with reference to FIGS.

FIG. 7 is a vibration model (one-degree-of-freedom model) when a rope-coupled vibration control structure using the holding device 4D as an example is applied to a pair of structures 1 and 2. FIG. 9 is a characteristic diagram showing a numerical analysis result using the vibration model. In this vibration model, m ₁ is the mass at the height position of the fastening portion 1a of one structure 1, m ₂ is the mass at the height position of the support portion 2a in the other structure 2, and x ₁ is the above fastening speed. displacement at the height position of the parts 1a, x ₂ is displaced in the height position of the supporting portion 2a, k ₁ is one of the spring constant of the structure 1, k ₂ is a spring constant of the other structure 2, f _c is tension applied to the rope, k _f is a spring constant of the spring 7, the C _f is the damping coefficient of the damper 10 (vibration damper).

It is the vibration of the lowest order mode (for example, primary mode) of the structure 1 and the structure 2 that becomes a problem with respect to the earthquake. The vibration model of FIG. 7 is a vibration model for analyzing the primary mode and vibration of one degree of freedom of the pair of structures 1 and 2. For such a vibration model, if the seismic motion acting on the ground of the pair of structures 1 and 2 is w, the equation of motion when the pair of structures 1 and 2 is vibrated by the seismic motion w is expressed by equation (1). represented, also tension _{f c} is expressed by equation (2).

  Substituting the above equation (2) into the above equation (1) and rearranging, the equation of motion is expressed as the following equation (3). Then, when the equation of motion of Equation (3) is Laplace transformed, the following Equation (4) is obtained.

  Here, X1 in the above equation (4) is the displacement amplitude of one structure 1, and X2 is the displacement amplitude of the other structure 2. Solving the displacement amplitude X1 of the structure 1 and the displacement amplitude X2 of the structure 2 by using the Laplace operator s = d / dt, the following equation (5) is obtained.

  Since seismic waves vary depending on the location of the earthquake and the nature of the ground, etc., in this embodiment, the numerical analysis of the rope-connected damping structure was performed using the impulse wave and sine wave as the seismic motion w (earthquake wave). FIG. 8 shows a pair of structures 1 and 2 when the ratio of the natural frequency of the structure 1 and the structure 2 is 1: 1 and when the structure 1 and the structure 2 stand independently. The frequency response and time response of vibration are shown. As shown in FIG. 8, in the frequency response, the resonance peak grows greatly in both structures 1 and 2 at the natural frequency of 1 rad / s (natural frequency: 0.159 Hz). So the vibration continues.

  On the other hand, when the ratio of the natural frequency of the structure 1 and the structure 2 is 1: 1.3, the resonance peaks of the frequency response are connected to both the structures 1 and 2 as shown in FIG. It can be seen that the vibration is suppressed by damping and the vibration is quickly attenuated by the impulse response. That is, even if the ratio of the natural frequency between the structure 1 and the structure 2 is 1: 1, both ends of the rope-coupled damping structure are connected to each other as shown in FIG. By connecting to different heights, a sufficient damping effect can be expected as shown in FIG.

  According to this embodiment, since the rope 3 and the holding device 4 are provided, the present invention can be applied even when the distance between the pair of structures 1 and 2 is relatively long, and a pair of structures without requiring a power source. Damping of the structures 1 and 2 can be realized.

Moreover, according to this embodiment, since different heights in the pair of structures 1 and 2 are connected to each other by the connecting device C, reaction force is generated between the pair of structures 1 and 2 having the same vibration characteristics. Therefore, the vibration control of the pair of structures 1 and 2 can be realized.
Further, according to the present embodiment, since a plurality of coupling devices C are provided between the pair of structures 1 and 2, robustness and redundancy of the vibration damping function can be ensured.

Moreover, according to this embodiment, since the holding | maintenance apparatus 4 (4A, 4B, 4C, 4D, 4E, 4F, 4G) is provided only in the one end side of the rope 3, it is a pair of structure 1 with a required minimum structure. , 2 can be realized.
Furthermore, according to the present embodiment, since the holding devices 4A, 4B, 4C, 4D, 4E, 4F, and 4G are employed as the holding device 4, it is possible to effectively realize vibration damping of the pair of structures 1 and 2. Can do.

In addition, this invention is not limited to the said embodiment, For example, the following modifications can be considered.
(1) In the above embodiment, the case where the present invention is applied to damping the pair of structures 1 and 2 has been described, but the present invention is not limited to this. Realizing vibration control of three or more structures by connecting adjacent ones of the three or more structures with a rope-coupled vibration control structure including the rope 3 and the holding device 4 Is possible.

(2) In the above embodiment, the holding devices 4A, 4B, 4C, 4D, 4E, 4F, and 4G have been described as specific examples of the holding device 4, but the present invention is not limited to this. As the configuration of the holding device 4, various combinations of the pulley 5, the weight 6, the spring 7, the mounting base 8, the braking motor 9, the dampers 10 and 12, and the brake 11 can be considered.

(3) In the above embodiment, one end of the rope 3 is a fixed end and the other end is a movable end, but the present invention is not limited to this. It is good also considering the both ends of the rope 3 as a movable end as needed. For example, when the holding device 4A is employed, the holding device 4A including the pulley 5 and the weight 6 is provided in any of the pair of structures 1 and 2. That is, in this case, the rope 3 and the pair of holding devices 4A constitute a rope connection damping structure.

(4) In the above embodiment, the installation mode in which three sets of rope-coupled damping structures are provided between the pair of structures 1 and 2 has been described, but the present invention is not limited to this. You may provide multiple rope connection damping structures other than three sets.

DESCRIPTION OF SYMBOLS 1, 2 Structure 1a, 2b Fastening part 1b, 2a Support part 3 Rope 4, 4A, 4B, 4C, 4D, 4E, 4F, 4G Holding device 5 Pulley 6 Weight 7 Spring 8 Mounting base 9 Braking motor 10, 12 Damper 11 Brake 12a Copper plate 12b, 12c Permanent magnet 12d, 12e Friction plate A Armature C Connecting device F Field coil R Variable resistance

Claims (10)

At least two structures;
A connecting device for connecting the structure,
The coupling device includes a rope and a rope coupling damping structure characterized in that the coupling device includes a rope and a holding device that holds the rope so that the rope can be fed out in a tensioned state.   The rope connection damping structure according to claim 1, wherein the connecting device connects different heights to each other in the structure.   The rope connection damping structure according to claim 1 or 2, wherein a plurality of the connection devices are provided between the pair of structures.   The rope connection vibration damping structure according to any one of claims 1 to 3, wherein the holding device is provided only on one end side of the rope.   The said holding | maintenance apparatus is provided with the pulley on which the said rope is wound, and the tension | tensile_strength addition means which adds tension | tensile_strength to the front-end | tip of the said rope pulled out from this pulley, The any one of Claims 1-4 The rope connection damping structure according to one item.   The rope connection damping structure according to claim 5, wherein the tension applying means is a weight provided at a tip of the rope.   The rope connection damping structure according to claim 5, wherein the tension applying means is a spring having one end connected to the tip of the rope and the other end connected to the structure.   8. The rope connection damping structure according to claim 7, wherein a brake motor is incorporated in the pulley.   The rope connection damping structure according to claim 5, wherein a vibration attenuator is provided at a tip of the rope. The rope connection damping structure according to claim 5, further comprising a brake that restricts movement of the tip of the rope.

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