Pendulum-type damping device

Abstract

To make a skeleton compact by reducing the oscillation range of a mass body while securing vibration control performance.SOLUTION: A pendulum-type vibration damping device 10A includes a support frame 20, a suspension member 25 having flexibility and provided so as to extend downward from the support frame 20, a mass body 30 suspended from the suspension member 25 and provided so as to be swingable with respect to the support frame 20, a damping device 40 having one end attached to the mass body 30 and the other end attached to the support frame 20, and a swing restricting section 50 provided at an intermediate portion of the suspension member 25 so as to be immovable relative to the support frame 20 and spaced apart from the suspension member 25, the swing restricting section 50 being brought into contact with the suspension member 25 when the mass body 30 swings to restrict an upper swing range of the suspension member 25.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pendulum-type vibration damping device. [Background technology]

[0002] High-rise buildings and other structures are sometimes equipped with vibration control devices called TMDs (Tuned Mass Damper), which consist of a suspension member attached to the support frame at the top end and a mass at the bottom end.When vibrations occur in the building due to earthquakes, strong winds, etc., the TMD damps the vibrations by causing the mass suspended from the support structure to move in a pendulum motion. For example, Patent Document 1 discloses a hanger support structure for a seismic control device in which the upper end of a hanger is attached to a support frame and the lower end of the hanger is attached to a mass body. In this hanger support structure, a pressure-receiving member through which the upper end of the hanger passes is fixed to the support frame, and the pressure-receiving member has a hanger insertion hole that extends in the vertical direction, and the wall surface of the hanger insertion hole has a revolution shape that gradually widens as it goes downward, so that when the mass body sways, the hanger deforms along the wall surface. Furthermore, Patent Document 2 discloses a vibration control device that damps vibrations of a building by causing a mass body suspended by a hanging member from a support frame to perform pendulum motion. This vibration control device includes a connecting member that connects the mass body to multiple juxtaposed hanging members, a first connecting part that rotatably connects the connecting member to each hanging member around a first axis that is perpendicular to a first vertical plane that includes the multiple hanging members, and a second connecting part that rotatably connects the connecting member to the mass body around a second axis that is perpendicular to a second vertical plane that is perpendicular to the first vertical plane. Furthermore, Patent Document 3 discloses a vibration control device in which the upper end of a hanging member is attached to a support structure and the lower end of the hanging member is attached to a mass body. In this vibration control device, a hanging member movement restricting part extending parallel to a first horizontal direction is fixed to at least one of the support structure side and the mass body side, and by inserting the hanging member into a groove between the hanging member movement restricting parts, movement of the hanging member is permitted in the first horizontal direction, and movement of the hanging member is restricted by the hanging member hitting and bending in a second horizontal direction perpendicular to the first horizontal direction.

[0003] In the vibration control devices configured as disclosed in Patent Documents 1 to 3, a space corresponding to the length of the hanging member is required to swing the mass body, and the vibration control device itself tends to be large. Accordingly, it is necessary to secure a corresponding amount of space on the building frame side to install the vibration control device. It is desirable to reduce the swing range of the mass body and realize a compact body while ensuring vibration damping performance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2014-228131 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-227804 [Patent Document 3] Japanese Patent Application Laid-Open No. 2014-227805 Summary of the Invention [Problem to be solved by the invention]

[0005] The problem that the present invention aims to solve is to provide a pendulum-type vibration damping device that can reduce the range of displacement of the mass body while ensuring vibration damping performance, thereby making it possible to realize a compact body. [Means for solving the problem]

[0006] The inventors have devised a method for limiting the response displacement of a mass body suspended from a hanging member by using a pendulum-type vibration control device to be installed on a structure in the event of an unexpected major earthquake, preventing the mass body from colliding with a wall or other surface. Specifically, in a pendulum-type vibration control device, a cross member is extended from a support frame, and a swing limiting section with a curved surface is provided on the cross member. When the response displacement of the mass body attempts to exceed a predetermined value, the hanging member comes into contact with the swing limiting section, thereby limiting the swing range of the upper side of the hanging member while ensuring a certain level of damping performance. This led to the present invention. In order to solve the above problems, the present invention employs the following means. That is, the pendulum-type vibration control device of the present invention is a pendulum-type vibration control device to be installed on a structure, and is characterized by comprising: a support frame; a flexible hanging member extending downward from the support frame; a mass body suspended from the hanging member and arranged so as to be able to swing freely relative to the support frame; a damping device having one end attached to the mass body and the other end attached to the support frame; and a swing limiting section that is arranged at an intermediate portion of the hanging member, spaced apart from the hanging member and unable to move relative to the support frame, with which the hanging member comes into contact when the mass body swings, thereby limiting the swing range of the hanging member above. With this configuration, when a structure sways due to an earthquake, strong winds, or the like, the support frame displaces in response to the swaying of the structure. Because the mass body is suspended from the support frame by the hanging members, it sways relative to the displacing support frame due to inertia. The swaying of this mass body is damped by the damping device, thereby damping the swaying of the structure. Here, the swing limiting part is provided so as not to move relative to the support frame, so when the support frame displaces, it displaces together with the support frame. The swing limiting part is provided at a distance from the middle part of the hanging member. Therefore, when the structure sways and the mass body sways, the hanging member displaces relative to the swing limiting part so that the distance between the middle part of the hanging member and the swing limiting part approaches or increases. In this configuration, when the swaying of the structure is small, the hanging member does not come into contact with the sway limiting portion even if the mass body sways. When the swaying of the structure becomes large, the middle portion of the hanging member comes into contact with the sway limiting portion, limiting the swing range of the hanging member above the sway limiting portion. When the middle portion of the hanging member comes into contact with the sway limiting portion, the mass body attempts to move further in the direction in which the hanging member contacted the sway limiting portion. Here, because the hanging member is flexible, it bends, and the mass body sways with a radius equal to the length of the hanging member below the sway limiting portion. In this way, when the swaying of the structure is large, the mass body sways not along the entire length of the hanging member, but along a radius equal to the smaller length of the hanging member below the sway limiting portion, thereby limiting the range of displacement of the mass body. As a result, it is possible to provide a pendulum-type vibration damping device that can reduce the range of displacement of the mass body and realize a compact body while ensuring vibration damping performance.

[0007] In one aspect of the present invention, the sway limiting portion is provided at the middle portion of the cross member extending from the support frame and has a curved contact portion, and when the mass body sways, the hanging member comes into contact with the contact portion, thereby limiting the swing range of the hanging member above the sway limiting portion. According to this configuration, the sway limiting portion is supported on the support frame via the cross member. The contact portion of the sway limiting portion is provided in the middle of the cross member. By making the contact portion a curved surface, damage or breakage of the hanging member when it comes into contact with the contact portion can be suppressed. Therefore, the durability of the hanging member can be increased.

[0008] In one aspect of the present invention, the pendulum-type vibration control device of the present invention comprises one or more internal frames arranged inside the support frame, and the support frame, the one or more internal frames, and the mass body are nested in this order from the outside to the inside and are suspended and supported in stages from the outside to the inside by multiple sets of suspension members, and the swing limiting section is provided for the suspension members that are arranged so that the support frame suspends and supports the outermost internal frame. With this configuration, the support frame, one or more internal frames, and mass body are nested in this order from outside to inside, and are suspended and supported in stages from outside to inside by multiple sets of suspension members. As a result, when the support frame displaces as the structure sways, the one or more internal frames and mass body provided inside it displace in stages. The displacement of the support frame and mass body is damped by the damping device, thereby suppressing vibration of the structure. When the displacement of the outermost inner frame exceeds a certain level, the suspension member that supports the outermost inner frame comes into contact with the swing limiting section, limiting the swing range of the suspension member above the swing limiting section. This reduces the range of displacement of the inner frame and mass body. In addition, the support frame, one or more internal frames, and mass body are nested in this order from the outside to the inside, and are suspended and supported in stages, making it possible to make the body smaller than if no internal frame were provided. In this way, it is possible to provide a multi-stage pendulum type vibration damping device that can be realized with a compact frame. [Effects of the Invention]

[0009] According to the present invention, it is possible to reduce the swing range of the mass body while ensuring vibration damping performance, thereby realizing a compact body. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view showing the configuration of a pendulum-type vibration damping device according to an embodiment of the present invention. [Figure 2] 2 is a plan cross-sectional view showing the configuration of the pendulum-type vibration damping device of FIG. 1, and is a cross-sectional view taken along the line II in FIG. 1. [Figure 3] 2 is a plan view showing a swing limiting portion of the vibration damping device of FIG. 1. FIG. [Figure 4] FIG. 4 is a vertical cross-sectional view of the swing restriction portion of FIG. 3. [Figure 5] FIG. 2 is a longitudinal sectional view of an operating model corresponding to a pendulum-type vibration damping device according to an embodiment. [Figure 6] FIG. 6 is a cross-sectional plan view of the operating model of FIG. 5. [Figure 7A] FIG. 10 is a diagram showing the displacement of a simple pendulum in a comparative example. [Figure 7B] FIG. 10 is a diagram showing the displacement of a simple pendulum in Study Example 1. [Figure 7C] FIG. 10 is a diagram showing the displacement of a simple pendulum in Study Example 2. [Figure 8A]FIG. 10 is a diagram showing the displacement of a simple pendulum in Study Example 3. [Figure 8B] FIG. 10 is a diagram showing the displacement of a simple pendulum in Study Example 4. [Figure 9] FIG. 10 is a cross-sectional view showing the shape of an end face of a swing limiting portion in a first modified example of the embodiment. [Figure 10] FIG. 10 is a cross-sectional view showing the configuration of a pendulum-type vibration damping device according to a second modified example of the embodiment. [Figure 11] FIG. 11 is a cross-sectional plan view showing the configuration of the pendulum-type vibration damping device of FIG. [Figure 12] FIG. 10 is a cross-sectional view showing the configuration of a pendulum-type vibration damping device according to a third modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present invention provides a pendulum-type vibration damping device to be installed on a structure. Specifically, the pendulum-type vibration damping device includes a support frame, a suspension member suspended from the support frame, a mass body suspended from the suspension member, a damping device connecting the mass body to the support frame, and a swing limiting part extending from the support frame. The swing limiting part limits the swing range of the suspension member from which the mass body is suspended. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments for carrying out a pendulum type vibration damping device according to the present invention will be described with reference to the accompanying drawings. A longitudinal cross-sectional view showing the configuration of a pendulum-type vibration damping device according to an embodiment of the present invention is shown in Fig. 1. Fig. 2 is a plan cross-sectional view showing the configuration of the pendulum-type vibration damping device of Fig. 1, taken along the line II in Fig. 1. As shown in Figures 1 and 2, a pendulum-type vibration damping device 10A (hereinafter simply referred to as vibration damping device 10A) includes a support frame 20, a hanger 25, a mass body 30, a damping device 40, and a swing limiting unit 50. This vibration damping device 10A is installed in a high-rise structure such as a building, an apartment building, or a tower structure. In this embodiment, the vibration damping device 10A is formed in a rectangular shape when viewed from above. The shape of the vibration damping device 10A is not limited to a rectangular shape when viewed from above, and it may also be a circular shape, a polygonal shape when viewed from above, or the like. The support frame 20 is installed on an installation surface 1, such as the floor or roof of a structure. The support frame 20 has vertical members 21 and horizontal members 22. The vertical members 21 are installed so as to extend vertically upward from the installation surface 1. The vertical members 21 may be, for example, rectangular in plan view and in the shape of a square tube extending in the up-down direction. The vertical members 21 may also be in the shape of multiple pillars extending upward from the installation surface 1. The horizontal members 22 are installed so as to be supported by the vertical members 21 and extend horizontally. The horizontal members 22 may be in the shape of flat plates installed on the vertical members 21, or may be assembled on the vertical members 21 in, for example, a grid pattern in plan view. The support frame 20 is fixed to the installation surface 1 of the structure and displaces together with the structure when the structure is shaken by an earthquake, strong winds, or the like.

[0012] Mass body 30 is suspended from support frame 20 via hangers 25. Mass body 30 has a base member 31 that is a rectangular plate in plan view, and a mass body main body 32 fixed to base member 31. The weight of mass body 30 is set based on various characteristics of the structure, such as the structure, rigidity, and weight. The hanging members 25 are arranged at the four corners of the base member 31. The upper end of each hanging member 25 is connected to a cross member 22 of the support frame 20. The hanging members 25 are arranged to extend downward from the cross member 22. The hanging members 25 are formed of a flexible linear material such as a steel cable. The lower ends of the hanging members 25 are connected to the corners of the base member 31. The mass body 30 is suspended by multiple hanging members 25, and is configured to be able to swing relative to the support frame 20 in response to the swaying of the structure when the structure sways due to an earthquake, strong winds, etc. The damping devices 40 damp the vibration of the mass body 30. As shown in FIG. 2 , a plurality of damping devices 40 are arranged, for example, around the base member 31 of the mass body 30. The damping devices 40 are arranged so as to have rotational symmetry around the mass body 30 in a plan view. That is, the damping devices 40 are arranged at equal intervals in the circumferential direction around the mass body 30. In this embodiment, the damping devices 40 are arranged along each of the four sides of the mass body 30. Each damping device 40 is formed, for example, by an oil damper. The damping device 40 is arranged between the mass body 30 and the support frame 20. One end of the damping device 40 is attached to the mass body 30 by a pin joint. The other end of the damping device 40 is attached to the support frame 20 by a pin joint.

[0013] Fig. 3 is a plan view showing a swing limiting portion of the vibration damping device of Fig. 1. Fig. 4 is a vertical cross-sectional view of the swing limiting portion of Fig. 3. The swing limiting portions 50 are arranged corresponding to each hanging member 25. As shown in FIGS. 3 and 4, the swing limiting portions 50 limit the swing range of the hanging member 25 at the vertical middle portion of the hanging member 25. The swing limiting portions 50 have a horizontal member 51 and a contact portion 52. As shown in FIG. 2, the horizontal member 51 extends horizontally from the vertical member 21. The horizontal member 51 is installed between the vertical members 21 located on opposite sides of each other. As shown in FIGS. 3 and 4, a contact portion 52 is joined to the middle portion of the horizontal member 51 installed in this manner. In this way, the horizontal member 51 supports the contact portion 52. The contact portion 52 is formed in a ring shape in a plan view. The suspension member 25 is inserted inside the contact portion 52. As a result, the contact portion 52 is arranged to surround the suspension member 25. In a normal state where no earthquake or the like is occurring, the suspension member 25 extends vertically due to its own weight and is inserted into the center of the ring-shaped contact portion 52. In a normal state, the contact portion 52 is arranged at a horizontal distance from the suspension member 25. The contact portion 52 is arranged at a position corresponding to the middle portion between the upper and lower ends of the suspension member 25 in the vertical direction. For example, the middle portion is defined as a range below a position that is 20% lower than the upper end of the suspension member 25 in length and above a position that is 80% lower than the upper end of the suspension member 25 in length, and the contact portion 52 can be arranged at any position in this middle portion. The contact portion 52 has an end surface 52f facing the radially inwardly disposed suspension member 25. The vertical middle portion of the end surface 52f is a curved surface that protrudes in a curved shape toward the radially inward suspension member 25. In this way, the contact portion 52 has a curved shape. When the structure sways due to an earthquake, strong winds, or the like, mass body 30 swings around the upper end of hanging member 25. The swing limiting section 50 limits the swing range of hanging member 25 at section 25T above swing limiting section 50 by contacting contact section 52 with the middle section of hanging member 25, which swings together with mass body 30.

[0014] Fig. 5 is a vertical cross-sectional view of an operating model corresponding to a pendulum-type vibration damping device according to an embodiment, and Fig. 6 is a plan cross-sectional view of the operating model of Fig. 5. 5 and 6, in the operating model of the pendulum-type vibration damping device 10A described above, when a structure sways due to an earthquake, strong winds, or the like, the support frame 20 is displaced in response to the swaying of the structure. Since the mass body 30 is suspended from the support frame 20 by the hanging members 25, it sways relative to the displacing support frame 20 due to inertia. This swaying of the mass body 30 is damped by the damping device 40. This damps the swaying of the structure. Here, the swing limiting part 50 is provided so as to be immovable relative to the support frame 20, and therefore, when the support frame 20 is displaced, it is displaced together with the support frame 20. This swing limiting part 50 is provided at a distance from the middle part of the hanging member 25. Therefore, when the structure sways and the mass body 30 sways, the hanging member 25 is displaced relative to the swing limiting part 50 so that the distance between the middle part of the hanging member 25 and the swing limiting part 50 approaches or increases. In this configuration, when the swaying of the structure is small, as shown in state A1 in Fig. 5, even if the mass body 30 sways, the hanging member 25 does not come into contact with the swing limiting part 50. When the swaying of the structure becomes large, as shown in state A2, the middle part of the hanging member 25 comes into contact with the swing limiting part 50, and the swing range of the part 25T of the hanging member 25 above the swing limiting part 50 is limited. When the middle part of the hanging member 25 comes into contact with the swing limiting part 50, the mass body 30 tries to move further in the direction in which the hanging member 25 came into contact with the swing limiting part 50. Here, because the hanging member 25 is flexible, the hanging member 25 bends, and the mass body 30 sways with a radius equal to the length of the hanging member 25 below the swing limiting part 50. In this way, when the structure sways significantly, the mass body 30 sways with a radius equal to the length of the suspension member 25 below the sway limiting section 50, rather than the entire length of the suspension member 25, so the range of displacement of the mass body 30 is limited.

[0015] Such oscillation of mass body 30 is damped by damping device 40. As described above, damping device 40 is provided so as to have rotational symmetry when viewed in a plan view, and therefore damping device 40 efficiently damps the oscillation of mass body 30 regardless of the direction in which mass body 30 oscillates. Furthermore, since both ends of the damping device 40 are pin-connected to the support frame 20 and the mass body 30, respectively, the movement of the mass body 30 is not easily impeded.

[0016] Here, the total length of the hanging member 25 including the mass body 30 is L, the length of the portion 25T of the hanging member 25 above the position P where the hanging member 25 abuts against the swing limiting portion 50 when the mass body 30 swings and the hanging member 25 abuts against the swing limiting portion 50 is L0, and the inclination angle of the hanging member 25 with respect to the vertical direction when the middle portion of the hanging member 25 abuts against the swing limiting portion 50 is θ0. The horizontal displacement S1 of the upper portion 25A of the hanging member 25 until the middle portion of the hanging member 25 abuts against the swing limiting portion 50 is S1=L0·sinθ0 This becomes: In the hanging member 25, the maximum displacement in the horizontal direction of the portion 25B below the position P where the hanging member 25 abuts against the swing limiting portion 50 is the length (L-L0) of the portion 25B below the hanging member 25 (and the mass body 30). Therefore, the maximum displacement S max is expressed by the following equation (1). S max =L0 sinθ0+(L-L0) (1) In contrast, when the swing limiting section 50 is not provided, the maximum displacement of the mass body 30 in the horizontal direction is the total length L of the hanging member 25 including the mass body 30. The value of the above formula (1) is smaller than this total length L. In this way, in the vibration damping device 10A of this embodiment, when the displacement of the mass body becomes larger than a certain amount, the middle part of the hanging member 25 comes into contact with the swing limiting part 50, thereby limiting the range of displacement of the mass body 30. The inclination angle θ0 is preferably set to a value of, for example, 15° or more and 30° or less.

[0017] According to the pendulum type vibration control device 10A described above, the pendulum type vibration control device 10A is installed on a structure and comprises a support frame 20, a flexible suspension member 25 extending downward from the support frame 20, a mass body 30 suspended from the suspension member 25 and arranged so as to be able to swing freely relative to the support frame 20, a damping device 40 having one end attached to the mass body 30 and the other end attached to the support frame 20, and a swing limiting section 50 arranged at an intermediate portion of the suspension member 25 at a distance from the suspension member 25 so as to be unable to move relative to the support frame 20, with which the suspension member 25 comes into contact when the mass body 30 swings, thereby limiting the swing range of the suspension member 25 above. With this configuration, it is possible to provide a pendulum-type vibration damping device 10A that, through the above-mentioned action, can ensure vibration damping performance while reducing the range of displacement of the mass body 30 and making the body compact.

[0018] In addition, the swing limiting section 50 is provided in the middle of the cross member 51 extending from the support frame 20 and has a curved contact section 52, and when the mass body 30 swings, the hanging member 25 comes into contact with the contact section 52, thereby limiting the swing range of the hanging member 25 above the swing limiting section 50. According to this configuration, the swing limiting unit 50 is supported by the support frame 20 via the cross member 51. The contact portion 52 of the swing limiting unit 50 is provided in the middle portion of the cross member 51. By making the contact portion 52 have a curved surface shape, damage or breakage of the hanging member 25 when the hanging member 25 comes into contact with the contact portion 52 can be suppressed. Therefore, the durability of the hanging member 25 can be increased.

[0019] In particular, in this embodiment, the support frame 20 comprises a vertical member 21 arranged to extend vertically, and a horizontal member 22 supported by the vertical member 21 and arranged to extend horizontally, the hanging member 25 is suspended from the horizontal member 22, and the sway limiting section 50 comprises a horizontal member 51 extending horizontally from the vertical member 21, and a contact section 52 joined to the horizontal member 51 and spaced apart from the hanging member 25 so as to surround the hanging member 25, the end face 52f facing the hanging member 25 being formed so that the middle portion in the vertical direction protrudes in a curved shape toward the hanging member 25, and when the mass body 30 sways, the hanging member 25 comes into contact with the contact section 52, thereby limiting the swing range of the hanging member 25 above the sway limiting section 50. According to this configuration, the sway limiting unit 50 is supported on the support frame 20 via the cross member 51. The contact portion 52 of the sway limiting unit 50 is spaced apart from the suspension member 25 and is disposed so as to surround the suspension member 25, thereby forming a ring shape when viewed from above. In the contact portion 52, the end surface 52f facing the suspension member 25 forms a convex curved surface, with the middle portion in the vertical direction protruding in a curved shape toward the suspension member 25. In the contact portion 52, by forming the end surface 52f, which comes into contact with the middle portion of the suspension member 25 when the displacement of the mass body 30 becomes greater than a certain level, into the shape described above, it is possible to suppress damage or breakage of the suspension member 25 when the suspension member 25 comes into contact with the contact portion 52. This increases the durability of the suspension member 25.

[0020] (Example of consideration) The pendulum type vibration damping device 10A described above was examined, and the results are shown below. The vibration damping device 10A was assumed to be a simple pendulum, and the hanging member 25 was a 6-m-long wire. The swing limiter 50 was placed at positions 0 m, 2 m, and 4 m from the top end of the wire, and the response displacement was obtained when a sine wave waveform was input. The amplitude of the input sine wave waveform was changed in 0.5 increments from 0.5 to 7.5 m. Two types of swing limiter 50 were prepared so that the inclination angle θ0 of the hanging member 25 with respect to the vertical direction until the middle portion of the hanging member 25 abutted against the swing limiter 50 was 0.314 rad (approximately 18 degrees) and 0.523 rad (approximately 30 degrees). The damping when the simple pendulum oscillated was set to 20%. In this way, the following study examples 1 to 4 corresponding to the above embodiment were prepared. Study example 1: The swing limiter is placed 2 m from the top of the wire, with the inclination angle of 0.314 rad until the middle of the hanging member abuts on the swing limiter. Study example 2: The swing limiter is placed 4 m from the top of the wire, with the inclination angle of 0.314 rad until the middle of the hanging member abuts on the swing limiter. Study example 3: The swing limiter is placed 2 m from the top of the wire, with the inclination angle of 0.523 rad until the middle part of the hanging material abuts on the swing limiter. Study example 4: The swing limiter is placed 4 m from the top of the wire, with the inclination angle of 0.523 rad until the middle part of the hanging material abuts on the swing limiter. In contrast, a comparative example was prepared in which no swing limiting portion was provided.

[0021] FIG. 7A is a diagram showing the displacement of a simple pendulum in a comparative example. FIG. 7B is a diagram showing the displacement of a simple pendulum in Study Example 1. FIG. 7C is a diagram showing the displacement of a simple pendulum in Study Example 2. FIG. 8A is a diagram showing the displacement of a simple pendulum in Study Example 3. FIG. 8B is a diagram showing the displacement of a simple pendulum in Study Example 4. In all of these diagrams, the horizontal axis represents the period of the input wave, and the vertical axis represents the maximum displacement of body mass 30 in the lateral direction. As shown in FIG. 7A, the bottom graph L1 and the top graph L2 in each diagram represent amplitudes of 0.5 and 7.5, respectively, and the results of changing the amplitude stepwise in increments of 0.5 are plotted between these graphs. As shown in Figure 7A, when no swing limiter was provided, the maximum displacement of the simple pendulum was 6 m, which corresponds to the length of the wire. In contrast, in Study Example 1, for example, the theoretical maximum displacement is calculated as 2 × sin(0.314) + (6 - 2) = 4.62 m according to equation (1), but as shown in the corresponding Figure 7B, the maximum displacement of the simple pendulum plateaued at around 4.62 m. Similarly, in Study Examples 2 to 4, the maximum displacement of the simple pendulum plateaued at around the theoretical value calculated according to equation (1). In this way, it was confirmed that the range of displacement of the mass body can be reduced by suppressing the displacement of the wire (hanging member) using the swing limiting section.

[0022] (First Modification of the Embodiment) The pendulum type vibration damping device of the present invention is not limited to the above-described embodiment explained with reference to the drawings, and various modifications are possible within the technical scope. For example, in the above embodiment, the end face 52f of the contact portion 52 is a curved surface in which the vertical middle portion of the end face 52f protrudes in a curved shape toward the radially inner suspension member 25, but this is not limited to this. FIG. 9 is a cross-sectional view showing the shape of the end face of the swing limiting portion in this modified example. As shown in Figure 9, at the contact portion 52 of the swing limiting portion 50, the end surface 52g facing the hanging material 25 may be formed so that the inner diameter gradually increases from the upper end to the lower end, and the distance from the hanging material 25 gradually increases, thereby forming a conical surface.

[0023] That is, in this modified example, the support frame 20 comprises a vertical member 21 arranged to extend vertically and a horizontal member 22 supported by the vertical member 21 and arranged to extend horizontally, the hanging member 25 is suspended from the horizontal member 22, and the sway limiting section 50 comprises a horizontal member 51 extending horizontally from the vertical member 21, and a contact section 52 joined to the horizontal member 51 and arranged to surround the hanging member 25 at a distance from the hanging member 25, the end face 52g facing the hanging member 25 being formed so that the distance from the hanging member 25 gradually increases from the upper end to the lower end of the end face 52g, and when the mass body 30 sways, the hanging member 25 comes into contact with the contact section 52, thereby limiting the swing range of the hanging member 25 above the sway limiting section 50. According to this configuration, the sway limiting unit 50 is supported on the support frame 20 via the cross member 51. The contact portion 52 of the sway limiting unit 50 is spaced apart from the suspension member 25 and is disposed so as to surround the suspension member 25, thereby forming a ring shape when viewed from above. The end face 52g of the contact portion 52 facing the suspension member 25 is formed so that the distance from the suspension member 25 gradually increases from the upper end to the lower end of the end face 52g, thereby forming the end face of the contact portion into a conical surface shape. By forming the end face 52g of the contact portion 52, which contacts the middle portion of the suspension member 25 when the displacement of the mass body 30 becomes greater than a certain level, damage or breakage of the suspension member 25 when the suspension member 25 contacts the contact portion 52, can be suppressed. Therefore, the durability of the suspension member 25 can be improved.

[0024] (Second Modification of the Embodiment) Fig. 10 is a cross-sectional view showing the configuration of a pendulum-type vibration damping device according to a second modified example of an embodiment of the present invention, Fig. 11 is a cross-sectional plan view showing the configuration of the pendulum-type vibration damping device of Fig. 10. As shown in Figures 10 and 11, a pendulum-type vibration damping device 10B according to a second modified example of this embodiment includes a support frame 20, a mass body 30, an inner frame 60A, a damping device 40 (see Figure 1), and a swing limiting section 50. The inner frame 60A integrally comprises an outer peripheral frame portion 61 formed on the outer periphery of the inner frame 60A, support portions 62 rising upward from the outer peripheral frame portion 61, and an inner peripheral frame portion 63 supported by the upper portions of the support portions 62. The inner frame 60A is provided inside the support frame 20. The mass body 30 is provided inside the inner frame 60A. The support frame 20, inner frame 60A, and mass body 30 are nested in this order from outside to inside, and in this modified example in particular, they are arranged coaxially with one another. The inner frame 60A is suspended from the support frame 20 by a set of hangers 25A. The mass body 30 is suspended from the inner peripheral frame portion 63 of the inner frame 60A by a set of hangers 25B. In this way, the mass body 30 is suspended and supported in stages from the outside to the inside from the support frame 20 by the sets of hangers 25A, 25B. In this modification, a swing limiting portion 50 is provided for the suspension member 25A that suspends and supports the inner frame 60A of the support frame 20.

[0025] That is, in this modified example, an internal frame 60A is provided inside the support frame 20, and the support frame 20, internal frame 60A and mass body 30 are nested in this order from the outside to the inside, and are suspended and supported in stages from the outside to the inside by multiple sets of suspension members 25A, 25B, and a swing limiting section 50 is provided on the suspension member 25A, which is arranged so that the support frame 20 suspends and supports the internal frame 60A. With this configuration, the support frame 20, inner frame 60A, and mass body 30 are nested in this order from outside to inside, and are suspended and supported in stages from outside to inside by multiple sets of hangers 25A, 25B. As a result, when the support frame 20 is displaced as the structure sways, the inner frame 60A and mass body 30 provided inside it are displaced in stages. The displacement of the support frame 20 and mass body 30 is damped by the damping device 40 (see FIG. 1), thereby suppressing vibration of the structure. When the displacement of the internal frame 60A exceeds a certain level, the suspension member 25A that suspends and supports the internal frame 60A comes into contact with the swing limiting section 50, restricting the swing range of the suspension member 25A above the swing limiting section 50. This makes it possible to reduce the range of displacement of the internal frame 60A and the mass body 30. Furthermore, the support frame 20, internal frame 60A, and mass body 30 are nested in this order from outside to inside, and are suspended and supported in stages, which allows the body to be smaller than if the internal frame 60A were not provided. In this way, it is possible to provide a multi-stage pendulum type vibration damping device 10B that can be realized with a compact frame.

[0026] (Third Modification of the Embodiment) FIG. 12 is a cross-sectional view showing the configuration of a pendulum-type vibration damping device according to a third modified example of the embodiment of the present invention. The present third modified example is a further modified example of the above-described second modified example. As shown in Fig. 12, a pendulum-type vibration damping device 10C according to the third modified example of this embodiment includes a support frame 20, a mass body 30, a plurality of internal frames 60A, 60B, a damping device 40 (see Fig. 10), and a swing limiting unit 50. Like the internal frame 60A, the internal frame 60B integrally comprises an outer peripheral frame portion 61 formed on the outer periphery of the internal frame 60B, a support portion 62 rising upward from the outer peripheral frame portion 61, and an inner peripheral frame portion 63 supported on the upper portion of the support portion 62. The inner frame 60B is provided inside the inner frame 60A. The mass body 30 is provided further inside the inner frame 60B located inside. The support frame 20, the inner frames 60A and 60B, and the mass body 30 are nested in this order from outside to inside, and in this modified example in particular, they are arranged coaxially with one another. The inner frame 60B is suspended from the inner peripheral frame portion 63 of the inner frame 60A by a set of hangers 25B. The mass body 30 is suspended from the inner peripheral frame portion 63 of the inner frame 60B by a set of hangers 25C. In this way, the mass body 30 is suspended from the support frame 20 in stages from the outside to the inside by the sets of hangers 25A, 25B, and 25C. In this modified example, a swing limiting portion 50 is provided for the suspension member 25A that suspends and supports the outermost inner frame 60A of the support frame 20.

[0027] That is, in this modified example, two internal frames 60A, 60B are provided inside the support frame 20, and the support frame 20, the two internal frames 60A, 60B, and the mass body 30 are nested in this order from the outside to the inside, and are suspended and supported in stages from the outside to the inside by multiple sets of suspension members 25A, 25B, 25C, and a swing limiting section 50 is provided for the suspension member 25A, which is arranged so that the support frame 20 suspends and supports the outermost internal frame 60A. With this configuration, the support frame 20, the two internal frames 60A, 60B, and the mass body 30 are nested in this order from outside to inside, and are suspended and supported in stages from outside to inside by multiple sets of hangers 25A, 25B, 25C. As a result, when the support frame 20 is displaced as the structure sways, the one or more internal frames 60A, 60B provided inside it and the mass body 30 are displaced in stages. The displacement of the support frame 20 and the mass body 30 is damped by the damping device 40 (see FIG. 1), thereby suppressing vibration of the structure. When the displacement of the outermost internal frame 60A exceeds a certain level, the suspension member 25A that suspends and supports the outermost internal frame 60A comes into contact with the swing limiting portion 50, restricting the swing range of the suspension member 25A above the swing limiting portion 50. This makes it possible to reduce the range of displacement of the internal frames 60A, 60B and the mass body 30. Furthermore, the support frame 20, the two internal frames 60A, 60B, and the mass body 30 are nested in this order from the outside to the inside, and are suspended and supported in stages, which allows the body to be smaller than if the internal frames 60A, 60B were not provided. In this way, it is possible to provide a multi-stage pendulum type vibration damping device 10C that can be realized with a compact frame.

[0028] (Other variations) Furthermore, in the third modified example of the above embodiment, two inner frames 60A, 60B are provided, but three or more inner frames may be provided in a nested arrangement. In addition, the configurations given in the above embodiments can be selected or changed as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0029] 10A~10C Vibration control device 40 Damping device 20 support frame 50 swing limiting portion 21 Vertical members 51 Horizontal members 22 Lateral member 52 Contact part 25, 25A, 25B, 25C Hanging material 52f, 52g End face 30 Mass body 60A, 60B Internal frame

Claims

1. A pendulum-type vibration control device to be installed on a structure, A support frame; A flexible hanging member provided so as to extend downward from the support frame; a mass body suspended from the suspension member and provided so as to be swingable relative to the support frame; a damping device having one end attached to the mass and the other end attached to the support frame; A swing limiting portion is provided at an intermediate portion of the hanging member, spaced apart from the hanging member so as to be immovable relative to the support frame, and contacts the hanging member when the mass body swings, thereby limiting the swing range of the upper portion of the hanging member; one or more internal frames provided inside the support frame; Equipped with The support frame, the one or more internal frames, and the mass body are nested in this order from the outside to the inside, and are suspended and supported in stages from the outside to the inside by multiple sets of suspension members, A pendulum-type vibration damping device, characterized in that the swing limiting portion is provided on the hanging member that is arranged so that the support frame suspends and supports the outermost internal frame.

2. 2. The pendulum type vibration damping device according to claim 1, wherein the swing limiting portion is provided at an intermediate portion of a cross member extending from the support frame and has a contact portion having a curved surface shape.

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