Vibration damping devices for structures

Abstract

To provide a vibration suppression device for structures that can exert a large rotational inertia mass effect even when a support member is short, and that can provide sufficient vibration suppression effect while significantly reducing a buckling stoppage of the support member.SOLUTION: A vibration suppression device for a structure of the present invention comprises a horizontal force supporting element (brace 5) which is installed between an outer column (first outer column PE1) arranged at one end of a structure S and an adjacent inner column EI and supports a horizontal force acting on the structure S at a larger burden ratio, a support member 2 arranged in a middle to a lower part of the structure S in a vertical direction and connected to the outer column at an its upper end and a mass damper 3 which is connected between a foundation F and a lower end of the support member 2, constitutes an additional vibration system A with the support member 2, has a rotating mass 16, and exerts a rotational inertia mass effect and a viscous damping effect by converting a vertical displacement of the structure S transmitted through the support member 2 into a rotational motion of the rotating mass 16 during vibration of the structure S.SELECTED DRAWING: Figure 1

Description

【Technical Field】 【0001】 The present invention relates particularly to a vibration control device for a structure for suppressing the vibration of a high-rise structure. 【Background Art】 【0002】 Conventionally, as this type of vibration control device, for example, the one disclosed in Patent Document 1 by the present applicant is known. As shown in FIG. 10, this vibration control device targets a structure S which is particularly a high-rise building, and is arranged on both outer sides of the structure S, and includes a plurality of support members 2 extending vertically between the top and the lower end thereof, a mass damper 53 arranged between the lower end of each support member 2 and the foundation F, and a number of buckling preventers 4 for preventing the buckling of the support members 2. 【0003】 The mass damper 53 and the support members 2 constitute an additional vibration system A' with respect to the structure S (main system) to be vibration-controlled. The support members 2 are composed of a plurality of hollow column members and are connected by bolts and nuts. The mass damper 53 is, for example, a ball screw type having an inner cylinder, ball screws, a rotating mass, etc., the inner cylinder is connected to the lower end of the support member, and the screw shaft of the ball screw is connected to the foundation F. The rotational inertia mass of the rotating mass and the rigidity of the support members 2 are set such that the natural frequency of the additional vibration system A' synchronizes with the natural frequency of the structure S. 【0004】 The buckling preventers 4 are arranged in a number at predetermined intervals along the length direction of the support members 2. Each buckling preventer 4 is integrated with the structure S and is composed of a slab in which a plurality of rectangular restraint holes are formed and a sliding plate attached to the wall surface of the restraint holes of the slab, and the support members 2 are inserted into each restraint hole. 【0005】 In the above configuration, when the structure S vibrates during an earthquake or other event, the bending deformation of the structure S exceeds the shear deformation due to the structure S being tall, causing the upper part of the structure S to reciprocate (oscillate) significantly in the lateral direction. This large displacement due to the oscillation is effectively transmitted to the mass damper 53 via the support member 2, which slides vertically through the restraint hole of the buckling stopper 4, causing the rotating mass to rotate and the additional vibration system A', consisting of the support member 2 and the mass damper 53, to vibrate. As a result, the natural frequency of the additional vibration system A' synchronizes with the natural frequency of the structure S, absorbing the vibration energy of the structure S and suppressing the vibration of the structure S. On the other hand, since the support member 2 is inserted into the restraint hole of the buckling stopper 4 and its horizontal movement is restrained, buckling of the support member 2 when a compressive load is applied is prevented. [Prior art documents] [Patent Documents] 【0006】 [Patent Document 1] Japanese Patent Publication No. 2014-132135 [Overview of the Initiative] [Problems that the invention aims to solve] 【0007】 In the conventional vibration damping device described above, buckling of the support member 2 is prevented by restricting the horizontal movement of the support member 2 with a buckling stopper, while allowing vertical movement of the support member 2 through the buckling stopper 4. This allows large displacements of the structure S to be effectively transmitted to the mass damper 53 via the support member 2, thereby enabling a large vibration damping effect due to the rotational inertia mass effect of the mass damper 53. However, due to its function, the buckling stopper 4 must be installed at predetermined intervals along the length of the support member 2. Therefore, as shown in Figure 10, as the length of the support member 2 increases with the height of the structure S, the number of buckling stoppers 4 required increases significantly, leading to a substantial increase in costs. 【0008】 Furthermore, the ball screw type mass damper 53 used in this vibration damping device has a mechanism in which the screw shaft of the ball screw and the inner cylinder mechanically mesh and rotate relative to each other. As a result, the equivalent mass due to the rotational inertia mass effect is limited to the 20,000-ton class, and it is difficult to increase the equivalent mass beyond this. In addition, in the case of the ball screw type, torque force is generated simultaneously with the damping force and acts on the support member, so a torsion stopper is also necessary to prevent twisting of the support member. 【0009】 The present invention was made to solve the above-mentioned problems, and aims to provide a vibration damping device for structures that can exert a large rotational inertia mass effect even when the support member is short, thereby significantly reducing the number of buckling stoppers used to prevent buckling of the support member, while obtaining a sufficient vibration suppression effect. [Means for solving the problem] 【0010】 To achieve the above objective, the invention according to claim 1 is a vibration damping device for a structure erected on a foundation, comprising: a horizontal force support element installed between an outer column and an inner column adjacent to the outer column, which is located at one end of the structure in a predetermined direction and supports the horizontal force acting on the structure with a larger bearing ratio; a support member located below the middle part of the structure in the vertical direction and whose upper end is connected to the outer column; and a mass damper connected between the foundation and the lower end of the support member, which together with the support member constitutes an additional vibration system and has a rotating mass, which, when the structure vibrates, converts the vertical displacement of the structure transmitted through the support member into rotational motion of the rotating mass, thereby exhibiting a rotational inertia mass effect and a viscous damping effect. 【0011】 When a structure vibrates during an earthquake or other event, horizontal forces (shear forces) act on the structure. In the case of tall structures, bending deformation outweighs shear deformation, causing the structure to vibrate (oscillate) in a manner in which its upper side moves significantly back and forth in the lateral direction. In contrast, in this invention, a horizontal force support element is installed between an outer column (hereinafter referred to as the "first outer column") located at one end of the structure in a predetermined direction and an adjacent inner column. Due to this horizontal force support element, the above-mentioned horizontal force is supported with a larger bearing ratio on the first outer column side than on the outer column located at the other end (hereinafter referred to as the "second outer column" side). Due to the effect of increasing the bearing ratio of horizontal forces by this horizontal force support element, when the structure oscillates, the axial force acting on the first outer column becomes larger than the axial force acting on the second outer column, and as a result, the vertical displacement of the first outer column becomes larger than that of the second outer column. 【0012】 Furthermore, in this invention, a support member is positioned below the middle of the structure in the vertical direction, the upper end of the support member is connected to an outer column, and a mass damper having a rotating mass is connected between the foundation and the lower end of the support member, thereby forming an additional vibration system with the support member and the mass damper. With this configuration, the vertical displacement of the structure that oscillates during an earthquake is transmitted to the mass damper via the support member and converted into rotational motion of the rotating mass, thereby exhibiting rotational inertia mass effect and viscous damping effect, and suppressing vibration of the structure. 【0013】 In this case, according to the present invention, since the support member is placed only on the first outer column side where the vertical displacement due to oscillation is greater, the difference in vertical displacement between the upper and lower connection nodes of the mass damper becomes larger, and a large rotational inertia mass effect can be obtained. As a result, even when the support member is short, a large rotational inertia mass effect can be achieved, and thereby a sufficient vibration suppression effect can be obtained while significantly reducing the buckling stopper required to prevent buckling of the support member. 【0014】 The invention according to claim 2 is characterized in that, in the vibration damping device for a structure described in claim 1, the mass damper is a pressure motor type mass damper that converts the flow of a working fluid generated by the transmission of the vertical displacement of the structure through a support member into rotational motion of a rotating mass. 【0015】 In this configuration, the mass damper is of the pressure motor type, and the rotational inertia mass effect is exerted by converting the flow of the working fluid, which is generated by the transmission of the displacement of the structure through the support member, into the rotational motion of the rotating mass. Due to this operating principle, the upper limit of the equivalent mass due to the rotational inertia mass effect is usually higher in the pressure motor type mass damper compared to the ball screw type mass damper, in which the screw shaft and inner cylinder rotate relatively while mechanically meshing. Therefore, when the support member is short, a greater rotational inertia mass effect can be exerted, and the effects described above according to the present invention can be obtained more effectively. In addition, unlike the ball screw type, the torque force is generated simultaneously with the damping force in the pressure motor type mass damper and does not act on the support member, so the torsion bracing of the support member can be omitted. 【0016】 The invention according to claim 3 is a vibration damping device for a structure according to claim 1 or 2, characterized in that the horizontal force support element is a brace that is positioned diagonally between the outer column and the inner column and is joined and fixed. 【0017】 With this configuration, since braces are used as horizontal force support elements, positioned diagonally between the outer and inner columns and joined and fixed together, the horizontal force support elements, and thus the vibration damping device of the present invention, can be realized inexpensively with a simple configuration. [Brief explanation of the drawing] 【0018】 [Figure 1] (a) A side view and (b) A plan view schematically showing the vibration damping device according to the present invention together with a structure to which it is applied. [Figure 2] This figure shows the installation state of the support members and mass dampers. [Figure 3]It is a cross-sectional view of a mass damper. [Figure 4] (a) Plan view showing two conventional models of a structure and a vibration control device for response analysis, and (b) another conventional model and the model of the present invention. [Figure 5] (a) - (c) Side views of three conventional models, and (d) excitation function diagram of the first mode of the structure itself in the conventional model. [Figure 6] (a) Side view of the model of the present invention, and (b) excitation function diagram of the first mode of the structure itself including braces in the model of the present invention. [Figure 7] Table showing the specifications of the mass damper and the support member in three conventional models and the model of the present invention. [Figure 8] Diagram showing the absolute acceleration response magnification and relative displacement response magnification between the top of the structure and the ground motion obtained by response analysis for three conventional models and the model of the present invention [Figure 9] Plan view showing another arrangement example of braces and additional vibration systems. [Figure 10] (a) Side view and (b) plan view schematically showing a conventional vibration control device together with a structure. 【Mode for Carrying Out the Invention】 【0019】 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the structure S provided with the vibration control device 1 is, for example, a 38-story high-rise building and is erected on the foundation F on the ground. The vibration control device 1 includes a plurality of additional vibration systems A composed of a support member 2 and a mass damper 3, a buckling prevention member 4 for preventing buckling of the support member 2, and a number of braces 5 (horizontal force support elements) installed in the core part of the structure S. The vibration control device 1 absorbs the vibration energy of the structure S by synchronizing the natural vibration frequency of the additional vibration system A with the natural vibration frequency of the structure S that vibrates during an earthquake or the like, and suppresses the vibration of the structure S. 【0020】 Structure S is a steel frame structure (S structure) with a rectangular plan shape and a frame structure with two spans in the short direction, consisting of multiple first and second outer columns PE1 and PE2 located at both ends in the short direction, and multiple inner columns PI located near the first outer column PE1, connected by multiple beams BM on each floor. The core is located between the first outer column PE1 and the inner column PI. The dimensions of structure S are, for example, the length of the long side L = @7.2m × 7 = 50.4m, the length of the short side D = 12.8 + 9.6 = 22.4m, and the height H = @4m × 38 = 152m. 【0021】 Brace 5 is designed to increase the axial force acting on the first outer column PE1 by increasing the proportion of the horizontal shear force acting on the structure S, thereby increasing the vertical displacement difference between the connection nodes of the mass damper 3. As shown in Figure 1, brace 5 is positioned between the first outer column PE1 and the inner column PI (core side) of the structure S, and is provided in all spans in the long-side direction throughout all floors from the top to the bottom. Brace 5 is made of steel column material and extends diagonally between the joint between the inner column PI and the lower beam BM, and between the joint between the first outer beam PE1 and the upper beam BM, and is connected and fixed therein. 【0022】 The additional vibration system A is installed between the 8th floor of structure S and the foundation F, and is positioned immediately outside the first outer column PE1 in the short-side direction of structure S. 【0023】 Support member 2 extends vertically on the outside of structure S, with its upper end connected to the 8th floor of structure S and its lower end connected to mass damper 3. Support member 2 is composed of multiple steel column members joined and fixed vertically, and as shown in Figure 2, a steel first connecting member 6 is integrally provided at its lower end, and is connected in series to one end of mass damper 3 via the first connecting member 6. Mass damper 3 is arranged vertically, and its lower end is connected to foundation F via steel second connecting member 7. 【0024】 Only one buckling stopper 4 is placed near the center in the vertical direction for each support member 2. Although not shown in the diagram, the buckling stopper 4, as in conventional designs, is integrated with the structure S and consists of a slab with multiple rectangular restraint holes and sliding plates attached to the walls of the restraint holes in the slab, with the support members 2 inserted into each restraint hole. 【0025】 The mass damper 3 is a gear motor type viscous mass damper using working fluid HF, and as shown in Figure 3, it comprises a cylinder 12 having a peripheral wall 12a and first and second end walls 12b, 12c and filled with working fluid HF, a piston 13 slidably mounted inside the cylinder 12 and dividing the inside of the cylinder 12 into first and second fluid chambers 12d, 12e, a communication passage 14 that bypasses the piston 13 and communicates with the first and second fluid chambers 12d, 12e, a gear motor 15 positioned in the communication passage 14, a rotating mass 16 connected to the gear motor 15, and first and second piston rods 17a, 17b integrally mounted on the piston 13 and extending to both sides thereof, protruding from the first and second end walls 12b, 12c, respectively. 【0026】 A hollow protrusion 12f is integrally provided on the first end wall 12b of the cylinder 12, and the first piston rod 17a is housed within this protrusion 12f. A first mounting fixture FL1 is provided on the tip of the protrusion 12f via a universal joint BJ, and a second mounting fixture FL2 is provided on the tip of the second piston rod 17b via a universal joint BJ. The working fluid HF is composed of a fluid with appropriate viscosity, such as silicone oil or hydraulic oil. 【0027】 The gear motor 15 is, for example, an external type, housed in a casing 15a that communicates with the communication passage 14, and has an input gear 15b and an output gear 15c that mesh with each other, and an output shaft 15d integrally connected to the output gear 15c. A disc-shaped rotating mass 16 is integrally connected to this output shaft 15d. Of course, an internal type gear motor 15 may also be used. 【0028】 The piston 13 has multiple holes that penetrate in the axial direction (only two are shown), and first and second relief valves 18 and 19 are provided in these holes, respectively. The first relief valve 18 consists of a valve body and a spring that biases the valve body to the closed position, and opens when the pressure of the working fluid HF in the first fluid chamber 12d increases as the piston 13 moves to the left in Figure 3 and reaches a predetermined relief load. The second relief valve 19 is similarly configured and opens when the pressure of the working fluid HF in the second fluid chamber 12e reaches a relief load as the piston 13 moves to the right in Figure 3. 【0029】 As shown in Figure 2, the mass damper 3 with the above configuration is attached to the upper surface of the second connecting member 7 via the first mounting bracket FL1 and to the lower surface of the first connecting member 6 via the second mounting bracket FL2. 【0030】 In this mass damper 3, when the structure S oscillates as shown in Figure 6(b) during an earthquake or other event, the vertical displacement of the structure S is transmitted to the mass damper 3 via the support member 2 and the first connecting member 6, causing the piston 13 to reciprocate relative to the cylinder 12. Consequently, the working fluid HF from one of the first and second fluid chambers 12d and 12e is pushed out by the piston 13 and flows into the communication passage 14. This flow of working fluid HF is converted into rotational motion by the gear motor 15, thereby exerting an inertial mass effect due to the rotation of the rotating mass 16, as well as an inertial mass effect due to the flow of the working fluid HF. In addition, a viscous damping effect is obtained as the working fluid HF flows within the communication passage 14. 【0031】 Furthermore, because the brace 5 is installed in the core section between the first outer column PE1 and the inner column PI, the proportion of horizontal force borne in the core section increases, resulting in the axial force and vertical displacement of the first outer column PE1 being greater than that of the second outer column PE2. And, because the support member 2 is placed only on the side of the first outer column PE1 where the vertical displacement is greater, the difference in vertical displacement between the upper and lower connection nodes of the mass damper 3 becomes larger, thus enabling a greater rotational inertia mass effect. As a result, even when the support member 2 is short as in this embodiment, a large rotational inertia mass effect can be achieved, thereby enabling a sufficient vibration suppression effect while significantly reducing the buckling stopper 4 used to prevent buckling of the support member 2. 【0032】 Next, with reference to Figures 4 to 8, we will explain the simulation analysis conducted to confirm the vibration damping effect of the vibration damping device of this embodiment, and its results. This simulation analysis is a time history response analysis of the response of the structure S when a predetermined seismic motion is input to the foundation F of the structure S. 【0033】 The conditions for the simulation analysis are as follows. First, the subjects of the analysis are one "model of the present invention" to which the present invention is applied, and three conventional models for comparison with the present invention ("Conventional Model 1" to "Conventional Model 3"), as shown in Figures 4 to 7. 【0034】 Specifically, in the present invention model, the additional vibration system A, consisting of a support member 2 and a mass damper 3, is arranged on one side only near the first outer column PE1, with two units provided for each first outer column PE1 (16 units in total). The connection position on the upper end side of the support member 2 is in the lower section (height 32m), the mass damper 3 is a gear motor type (equivalent mass md = 60,000 tons), and the brace 5 is arranged on the core side between the first outer column PE1 and the inner column PI, and is provided in each layer from the top to the bottom, for each span in the long side direction. 【0035】 In contrast, in the conventional model 1, the additional vibration system A', consisting of a support member 2 and a mass damper 53, is provided on both sides near the first and second outer columns PE1 and PE2, with one unit on each side (16 units in total). The connection point on the upper end of the support member 2 is at the top (height 152m), the mass damper 53 is of the ball screw type (equivalent mass md = 20,000 tons), and no brace 5 is provided. 【0036】 In the conventional model 2, the additional vibration system A is arranged on both sides, with one unit each (16 units in total) near the outer columns PE1 and PE2. The connection position of the support member 2 is in the lower part (height 32m), the mass damper 3 is of the gear motor type, and its equivalent mass md is 120,000 tons, which is twice that of the model of the present invention. The brace 5 is not provided. The conventional model 3 is configured similarly to the model of the present invention, except that the equivalent mass md of the gear motor type mass damper 3 is 120,000 tons and the brace 5 is not provided. 【0037】 The specifications of the mass dampers and support members in the four analysis models described above, including those already explained, are shown in Figure 7. All of these specifications were set through parametric studies so that the horizontal response magnification of the top (uppermost layer) to the first mode ground motion is approximately minimized. 【0038】 Furthermore, the assumed Kanto earthquake "Tokyo Meteorological Agency NS" and the designated wave "L2 Designated Hachinohe Phase" were used as input ground motions. In each analysis model, the response acceleration, velocity, and displacement at each floor of the structure S were calculated when these ground motions were input to the foundation F of the structure S. Figure 8 shows the horizontal response ratio (absolute acceleration response ratio, relative displacement response ratio) of the top of the structure to the ground motion for each analysis model, based on these calculation results. 【0039】 Regarding these results, we first compare Conventional Model 1 (top connection type, ball screw type) and Conventional Model 2 (low-rise connection type, gear model type), which differ in the connection position of the support member 2 (additional vibration system) and the type of mass damper. From Figures 8(a) and 8(b), in both Conventional Model 1 and Conventional Model 2, the additional vibration system resonates effectively with respect to the primary mode, which is the target of control, and the vibration damping effect is enhanced. Furthermore, it can be seen that Conventional Model 2, despite being a low-rise connection type with a connection height of support member 2 that is approximately 1 / 5 that of Conventional Model 1, and despite the small nodal displacement of the entire additional vibration system input from the structure S, achieves the same vibration damping effect as Conventional Model 1 because the gear motor type mass damper 3 has a large equivalent mass md. 【0040】 Furthermore, we compare two conventional models (both-sided arrangement) and a third conventional model (one-sided arrangement) that have different planar arrangements of the additional vibration system A. From Figures 8(b) and 8(c), it can be seen that even if the additional vibration system A is arranged on one side, as in the third conventional model, instead of on both sides, as in the two conventional models, it can be effectively made to resonate with the first mode, which is the target of control, and a large vibration damping effect equivalent to that of the two conventional models can be obtained. 【0041】 Next, we compare the three conventional models (md = 120,000 tons, without braces) with the present invention model (60,000 tons, with braces), which differ in the equivalent mass md of the mass damper 3 and the presence or absence of braces 5. First, Figures 5(d) and 6(b) are the excitation function diagrams of the first mode of the structure S itself, for the case without braces (conventional models 1-3) and the case with braces (present invention model), respectively. The vertical displacement difference at the damper connection nodes on the outer circumference of the core is -0.0220 in the case without braces, while it is -0.0343 in the case with braces. This increase is 0.0343 / 0.0220 = approximately 1.56 times due to the effect of increasing the proportion of horizontal shear force borne by the braces 5 installed on each layer of the core. 【0042】 Therefore, when the same equivalent mass is applied, the broadly defined internode inertial mass becomes approximately 2.4 times the square of the vertical displacement difference (= approximately 1.56 times). As a result, it was confirmed that in the present invention model, even though the equivalent mass md (= 60,000 tons) is 0.5 times that of the three conventional models (= 120,000 tons), the damping effect for the first mode is equal to or better than that of the three conventional models (see Figures 8(c) and 8(d)). 【0043】 As described above, with the vibration damping device of this embodiment, when the structure oscillates, the increased burden of horizontal force by the brace 5 installed between the first outer column PE1 and the inner column PI increases the vertical displacement difference between the upper and lower connection nodes of the mass damper 3, thereby obtaining a greater rotational inertia mass effect. For this reason, compared to the three conventional models, the equivalent mass md is halved, and compared to the one conventional model, the connection height of the support member 2 is approximately 1 / 5, yet an equivalent or better vibration damping effect can be obtained. 【0044】 As described above, even when the support member 2 is short, a large rotational inertia mass effect can be achieved, and a sufficient vibration suppression effect can be obtained while significantly reducing the buckling stopper 4 of the support member 2. 【0045】 Furthermore, in this embodiment, the additional vibration system A (support member 2 and mass damper 3) is located on one side of the lower part of the structure S, and the maximum displacement and maximum speed of the mass damper 3 are smaller than those of a conventional top-mounted device (conventional model 1), so they can be kept below the allowable stroke and allowable rotational speed of an existing pressure motor type mass damper. Therefore, commercially available pressure motor type mass dampers can be used as is. 【0046】 Furthermore, since the additional vibration system A only needs to be placed on one side of the structure S, by placing it on the rear side of the structure S rather than the front side (roadside), for example, the aesthetic design (exterior appearance) of the building can be maintained. 【0047】 It should be noted that the present invention is not limited to the embodiments described and can be implemented in various forms. For example, in the embodiment shown in Figure 1, the structure S is composed of two spans in the short-side direction, the brace 5 is provided in the core between the first outer column PE1 and the inner column PI, and is arranged in all spans in the long-side direction in all layers from the lowest to the highest layer, and the additional vibration system A is arranged on the outside of each first outer column PE1, but the present invention is not limited to these. 【0048】 For example, the present invention can of course be applied to structures S with three or more spans, in which case the brace 5 is placed between one outer column (first outer column PE1 in this example) and the adjacent inner column (first inner column PI1), as shown in Figure 9. In addition, instead of placing the brace 5 on all layers from the bottom to the top, it may be placed on some layers, although not shown, for example, every other layer or every few layers. 【0049】 Furthermore, as shown in Figure 9, horizontal force support elements such as braces 5 may be placed in only a portion of the span in the long-side direction of the structure S, rather than across the entire span. In this case, it is preferable to concentrate the additional vibration system A only on the outer periphery side of the first outer column PE1 where the braces 5 are placed. 【0050】 Furthermore, in this embodiment, a simple and inexpensive brace is used as the horizontal force support element of the present invention. However, other suitable configurations can be used as long as they support the horizontal force acting on the structure S with a larger proportion of the load. For example, instead of a brace, hysteresis dampers, viscous dampers, or viscoelastic dampers arranged diagonally may be used, or, if the structure is made of reinforced concrete (RC), a seismic wall covering the structural plane composed of left and right columns and upper and lower beams may be used. 【0051】 Furthermore, in this embodiment, the mass damper 3 is a gear motor type using the working fluid HF, but other pressure motors such as piston motors, vane motors, or screw motors may also be used. 【0052】 Furthermore, it is also within the scope of the present invention to adopt a ball screw type mass damper that drives the rotating mass using a ball screw instead of a pressure motor type mass damper. In the case of a ball screw type, although the upper limit of the equivalent mass is smaller compared to a pressure motor type, and therefore the resulting rotational inertia mass is smaller, the advantage of the present invention can be obtained in that a large rotational inertia mass effect can be achieved even when the support member is short, due to the effect of increasing the horizontal force bearing ratio by the brace 5 and the resulting increase in the vertical displacement difference between the connection nodes of the mass damper. 【0053】 Furthermore, the structure of the structure S is not particularly limited, and any of the following can be targeted for vibration control: steel frame (S structure), reinforced concrete (RC structure), steel-reinforced concrete (SRC structure), concrete-filled steel tube (CFT structure), etc. The present invention is particularly effective for steel towers and structures with a large aspect ratio. In addition, the details of the configuration can be appropriately modified within the scope of the spirit of the present invention. [Explanation of Symbols] 【0054】 1. Vibration damping device 2 Support members 3 Mass Damper 5. Braces (horizontal force support elements) 15. Gear motor (pressure motor) 16 rotations S structure F Foundation PE1 1st outer pillar (outer pillar) PI inner column

Claims

[Claim 1] A vibration damping device for a structure erected on a foundation, A horizontal force support element is installed between an outer column located at one end of the structure in a predetermined direction and an inner column adjacent to the outer column, and supports the horizontal force acting on the structure with a larger bearing ratio. A support member is positioned below the middle section in the vertical direction of the aforementioned structure, with its upper end connected to the outer column. A mass damper is connected between the foundation and the lower end of the support member, and together with the support member, constitutes an additional vibration system, and has a rotating mass, which, when the structure vibrates, converts the vertical displacement of the structure transmitted through the support member into rotational motion of the rotating mass, thereby exhibiting a rotational inertia mass effect and a viscous damping effect. A vibration damping device for a structure, characterized by being equipped with the following features. [Claim 2] The vibration damping device for a structure according to claim 1, characterized in that the mass damper is a pressure motor type mass damper that converts the flow of a working fluid generated by the transmission of the displacement of the structure through the support member into rotational motion of the rotating mass. [Claim 3] The vibration damping device for a structure according to claim 1 or 2, characterized in that the horizontal force support element is a brace that is positioned diagonally between the outer column and the inner column and joined and fixed.

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