Vibration control structure for building frames

Abstract

To provide a vibration dumping structure of a building skeleton capable of efficiently preventing the building skeleton from vibrating against vibration input and effectively suppressing a twist generated in the building skeleton.SOLUTION: A vibration dumping structure to dump vibration of a building skeleton 1 constructed with a lower part 1a fixed on the ground G against vibration input is provided with a pair of sub skeletons 2 arranged in a height direction of the building skeleton at both sides of the building skeleton, having apexes 2a rigidly connected on an apex 1b of the building skeleton and lower parts 2b placed upward apart from the ground to form an integrated vibration system with the building skeleton. Vibration bumping devices are provided in attachment areas F placed at each of gaps between each of lower parts of these sub skeletons and a lower part of the building skeleton as being placed in a direction along a circumference of a rigid axis R1 of the building skeleton in a flat surface along a ground surface E, with one end connected to the building skeleton and the other end connected to the sub skeleton.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention efficiently suppresses vibrations in a building frame against vibration input, and also reduces the vibrations that occur in the building frame. This relates to a vibration control structure for a building frame that can effectively suppress distortion. [Background technology]

[0002] There are various techniques for improving the vibration control effect of buildings, and for example, Patent Documents 1 and 2 are known. It is being done.

[0003] The "bending deformation control type seismic control frame" in Patent Document 1 is a connecting structure with a wall beam that extends horizontally at the top. The wall columns are earthquake-resistant elements of the story, and the wall beams are insulated from the wall beams on the plane. The connecting column is installed between the end of the wall beam and the top of the connecting column, and the relative distance between the end of the wall beam and the top of the connecting column A damping device that generates a damping force when displaced, or a pair of wall columns with wall beams facing each other, and It consists of a seismic control device installed between the ends of wall columns and wall beams, and gathers columns inside the building to wall columns and beams to wall beams. It is composed of approximately

[0004] In the "vibration control structure" of Patent Document 2, the structure is supported by a foundation and is composed of columns and beams. It is a steel-framed reinforced concrete building with three basement floors and a rigid frame structure. The lower end of the wall is firmly fixed, which prevents the wall from being deformed by the reaction force of the damper. The reduction in the expansion and contraction amount (deformation amount) of the damper due to the deformation of the wall-shaped member is suppressed, improving the vibration control effect. It is configured to do so. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 8-60895 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-94076 Summary of the Invention [Problem to be solved by the invention]

[0006] When a horizontal vibration external force such as an earthquake is input to a building frame, the building frame will Not only does the building sway in the direction of the force, but it also sways around the center of rigidity in a plane that crosses the building frame horizontally. It is known that torsion occurs in the building frame, and the building frame can be efficiently damped against vibration input. At the same time, measures were needed to effectively suppress twisting of the building frame.

[0007] The present invention has been devised in view of the above-mentioned conventional problems, and is a method for preventing a building frame from being subjected to vibration input. This building structure can efficiently suppress vibrations and effectively suppress torsion that occurs in the building frame. The object is to provide a vibration-damping structure for a structure. [Means for solving the problem]

[0008] The vibration control structure of the building frame according to the present invention is a building frame constructed with its lower part fixed to the ground. A vibration control structure for controlling vibration input, comprising: a frame support structure for supporting a building frame on both sides of the frame support structure; It is installed along the height direction of the structure, and its top is rigidly connected to the top of the building frame, and its bottom is a pair of sub-frames spaced apart from the building frame and forming an integral vibration system with the building frame, In the gaps between the bottom of each of these sub-frames and the bottom of the building frame, The structure is arranged in a direction along the rigid center of the building frame, and one end is connected to the building frame and the other end is connected to the A vibration damping device is provided connected to the sub-frame.

[0009] The rigidity centers of the pair of sub-frames in the plane along the ground surface are the same as the rigidity center of the building frame. The vibration damping devices are arranged on a straight line passing through the center of rigidity of the building frame. A pair of vibration damping devices are arranged on both sides of the straight line in a sandwiched arrangement, and the arrangement of these vibration damping devices is as follows: At least a tangent to a circle having a center at the rigidity center of the building frame passes through the rigidity centers of a pair of the sub-frames. It is characterized by being oriented so that vibration damping action occurs in the direction of the vibration.

[0010] The distance from the rigidity center of one of the sub-frames to the rigidity center of the building frame is La, and the distance from the rigidity center of the other sub-frame to the rigidity center of the building frame is La. When the distance from the rigidity center of the sub-frame to the rigidity center of the building frame is Lb, The damping performance Fa of the vibration damping device connected to the other sub-frame is The damping performance Fb is characterized by being set to satisfy the relationship La×Fb=Lb×Fa. [Effects of the Invention]

[0011] In the vibration control structure of the building frame according to the present invention, the building frame can be efficiently controlled against vibration input. This not only damps vibrations but also effectively suppresses twisting that occurs in the building frame. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a front view showing a preferred embodiment of a vibration control structure for a building frame according to the present invention. [Figure 2] FIG. 2 is a side view of the vibration control structure for the building frame shown in FIG. [Figure 3] 2 is a view taken along the line AA in FIG. 1. [Figure 4] 1. FIG. [Figure 5] FIG. 2 is an explanatory diagram illustrating a vibration system of the vibration control structure for the building frame shown in FIG. [Figure 6]2 is a schematic plan view illustrating an arrangement of vibration damping devices provided in the vibration control structure for the building frame shown in FIG. 1. FIG. [Figure 7] 7 is a schematic plan view illustrating an example of the arrangement of the vibration damping device in the mounting region, with respect to the arrangement mode of the vibration damping device shown in FIG. 6. FIG. [Figure 8] FIG. 2 is an explanatory diagram illustrating an example of the vibration control structure for the building frame shown in FIG. 1, in which the center of rigidity of the building frame is displaced from the centroid of the building frame. [Figure 9] FIG. 2 is an explanatory diagram illustrating another example of the vibration control structure for the building frame shown in FIG. 1, in which the center of rigidity of the building frame is displaced from the centroid of the building frame. [Figure 10] FIG. 2 is a front view corresponding to FIG. 1, showing a modified example of the vibration control structure for a building frame according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] A preferred embodiment of the vibration control structure for a building frame according to the present invention will be described below with reference to the accompanying drawings. This will be explained in detail.

[0014] FIG. 1 is a front view showing a preferred embodiment of a vibration control structure for a building frame according to the present invention, and FIG. Fig. 1 shows a side view of the vibration control structure of the building frame. Fig. 3 shows a view taken along the line AA in Fig. 1. Fig. 4 shows a 1. FIG.

[0015] The building frame 1 to be damped is made of steel, reinforced concrete, or steel-reinforced concrete. They are constructed using well-known column-beam structures such as steel-reinforced concrete structures.

[0016] The building frame 1 may be a new building or an existing building. The structure 1 is shown as a rectangular parallelepiped.

[0017] The building frame 1 is constructed such that the lower part 1a in the height direction of the building frame 1 is rigidly fixed to the ground G. Thus, external horizontal vibration forces such as earthquake motions are input to the building frame 1 from the lower portion 1a.

[0018] In such a building frame 1, horizontal vibration occurs, which sways in the main direction of the vibration input. Jiru.

[0019] The vibration control structure for a building frame according to this embodiment controls the horizontal vibrations occurring in the building frame 1. The sub-frame 2 described above can efficiently suppress vibrations, and furthermore, the sub-frame 2 is provided As a result, when the vibration control function is working, the plane that crosses the building frame 1 horizontally, i.e., the ground The torsion D of the building frame 1 occurring around the rigidity center R1 of the building frame 1 in the plane along the plane E is also , and is configured to be able to effectively suppress it.

[0020] A pair of sub-frames 2, 2 having the same dimensions and weight are provided on both sides of the building frame 1. Both sides of the building frame 1 mean both sides in the length direction and both sides in the width direction on the plane of the building frame 1. Alternatively, it may be on both sides in both the width direction and the length direction. The sub-frames 2, 2 are provided on both sides of the building frame in the longitudinal direction.

[0021] The pair of sub-frames 2, 2 are provided on both sides of the building frame 1, and these sub-frames 2 , 2, it is desirable to install it so that the rigidity center R1 of the building frame 1 itself does not move. stomach.

[0022] In other words, the pair of sub-frames 2, 2 are spaced apart from the building frame 1 by the center of rigidity R1 of the building frame 1. It is preferable to distribute them evenly around the periphery.

[0023] However, by providing a pair of sub-frames 2, 2 to the building frame 1, the rigidity of the building frame 1 can be increased. The center R1 may move, and in that case, the position after the movement is the same as the center of rigidity R1 of the building frame 1. will be done.

[0024] That is, in this specification, the rigidity center R1 of the building frame 1 is the center of rigidity R1 of the pair of sub-frames 2, 2. This refers to the center of rigidity in the state after preparation.

[0025] The sub-frame 2 can be made of steel, reinforced concrete, steel-framed reinforced concrete, or steel-framed concrete. It is constructed using well-known post-and-beam structures such as pallet construction.

[0026] The sub-frame 2 extends along the height direction of the building frame 1 from the top 1b of the building frame 1 to the bottom 1a. It is formed with a length shorter than the height of the building frame 1.

[0027] Specifically, the sub-frame 2 has a top 2a, which is the highest part of the sub-frame 2, and is connected to the building frame 1. It is located at almost the same height as the top 1b, which is the highest part, and the lower part 2b of the sub-frame 2 is located at The lower end of the sub-frame 2 is located above the lower end of the building frame 1 fixed to the ground G so as to be spaced apart upward. In the illustrated example, each sub-frame 2, 2 is constructed so that the height of the building frame 1 is It is shown as a rectangular parallelepiped that is long in the length direction.

[0028] The sub-frame 2 forms an integral vibration system with the building frame 1, so that the top 2a of the sub-frame 2 is It is rigidly connected to the top 1b of the building frame 1.

[0029] When the top 2a of the sub-frame 2 and the top 1b of the building frame 1 are rigidly connected, the horizontal direction of the building frame 1 The vibration is transmitted directly to the sub-frame 2 without being attenuated.

[0030] That is, the rigid connection is made by connecting the sub-frame 2 on the top 1b of the building frame 1 as shown in FIG. This means that the connected form forms a possible vibration system.

[0031] In the vibration control structure for a building frame according to this embodiment, the vibration system is divided into a building frame 1 and a sub-frame. The tops 1b and 2a of the sub-frame 2 are rigidly connected to each other, so that the sub-frame 2 is parallel to the building frame 1. The building frame 1 is placed at a folded position so that the relationship becomes

[0032] In this vibration system consisting of a building frame 1 and a sub-frame 2, the vibrations below the building frame 1 fixed to the ground G are The part 1a is the fixed end, and the sub-frame 2 is rigidly connected to the top 1b of the building frame 1. The part 2b (the lower part of the folded-back sub-frame 2 in this embodiment) is the free end.

[0033] When horizontal vibration is input to the building frame 1, the assumed top of the sub-frame 2, which is the free end, The lower part 2b of the sub-frame 2 in the folded position in this embodiment is A large displacement (maximum amplitude) occurs.

[0034] Regarding the rigid joint connecting the top 2a of the sub-frame 2 and the top 1b of the building frame 1, the damping is Since there is no such thing as a "zero" material, we must minimize the gap between the building frame 1 and the sub-frame 2 as much as possible. This means that vibrations must be transmitted without attenuation.

[0035] In addition, the sub-frame 2 is a vibration system that is integrated with the building frame 1, and is a vibration control target of the building frame 1. The sub-frame 2 functions as a weight linked to the vibration damping device 3 described later. It is desirable that the weight of the main frame 1 be 3.5 to 50%.

[0036] Each sub-frame 2 forms an integral vibration system with the building frame 1, and the lower part 2b is the free end of the vibration system. , 2 and the building to which the lower parts 2b, 2b of the sub-frames 2, 2 face A gap S is provided between the lower part 1a of the frame 1 and the lower part 1a.

[0037] In these gaps S, as shown by the symbol F in Figures 1, 2 and 4, one end of the sub-frame 2 is connected to the The other end is connected to the building frame 1, and the load is transmitted from the building frame 1 to the sub-frame 2 via a rigid joint. The attachment for attaching the vibration damping device 3 that damps horizontal vibrations occurring in the sub-frame 2 is The attachment area is set.

[0038] That is, by providing the building frame 1 with the sub-frame 2 and the vibration damping device 3, the spring system For a certain building frame 1, the sub-frame 2 is a mass element, and the vibration damping device 3 is a damping element. As a result, the building frame 1 is configured to damp vibrations caused by horizontal vibration input.

[0039] The vibration damping device 3 is a secondary free end where the maximum displacement occurs in the integrated vibration system. Vibrations occurring in the lower part 2b of the frame 2 are damped while being supported by the building frame 1.

[0040] The vibrations that are damped by the vibration damping device 3 occur in the sub-frame 2 relative to the building frame 1, Of course, the vibration may be such as

[0041] As the vibration damping device 3, various well-known devices may be used. For example, An oil damper is used that expands and contracts between the frame 2 and damps vibrations.

[0042] The vibration damping device 3 is also arranged in a direction along the rigidity center R1 of the building frame 1. and the sub-frame 2.

[0043] By providing a pair of sub-frames 2 to the building frame 1, as described above, the horizontal vibration input A torsion D may occur in the building frame 1 around its center of rigidity R1.

[0044] The vibration damping device 3 is supported by the lower part 1a of the building frame 1 when a torsion D occurs in the building frame 1. In this state, the movement of the lower part 2b of the sub-frame 2, which is displaced by the torsion transmitted from the building frame 1, is This effectively suppresses the twist D of the building frame 1.

[0045] The arrangement of the vibration damping device 3 in the above-mentioned mounting area F will be described with reference to FIGS. 6 to 9. In light of this, the following will be explained.

[0046] FIG. 6 illustrates the arrangement of the vibration damping device in the vibration control structure for the building frame according to this embodiment. FIG. 7 is a schematic plan view illustrating an example of the arrangement of the vibration damping device in the mounting area. FIG.

[0047] At the height position where the mounting area F of the vibration damping device 3 is set, the ground surface of the building frame 1 The center of rigidity R1 in the plane along E and the ground on which the building frame 1 is constructed, consisting of a pair of sub-frames 2, 2 The rigid centers R2 and R2 on the same plane as G along the ground surface E are both arranged on a straight line L. will be done.

[0048] That is, the rigidity centers R2, R2 of the pair of sub-frames 2, 2 are both the rigidity center R1 of the building frame 1. are arranged on a straight line L passing through

[0049] Therefore, the pair of sub-frames 2, 2 have their rigidity centers R2, R2 aligned with the rigidity center R of the building frame 1. They are constructed on both sides of the building frame 1 so as to be positioned side by side on a line L passing through 1.

[0050] In the mounting area F of the vibration damping device 3 set in the gap S, First, the beam 3 passes through the rigidity center R1 of the building frame 1 and the rigidity centers R2, R2 of the pair of sub-frames 2, 2. A pair of the electrodes are disposed on either side of the straight line L (see FIG. 7).

[0051] The number of vibration damping devices 3 to be installed does not matter as long as they are a pair with respect to the above-mentioned straight line L. I can't.

[0052] Therefore, the vibration damping device 3 is provided for each of the sub-frames 2, 2 at their respective rigidity centers R2, With respect to R2, a pair of R2 is disposed on one side and the other side divided by the straight line L.

[0053] Secondly, the arrangement of the vibration damping devices 3 is such that the center of rigidity R1 (torsion D The rigidity center of each sub-frame 2,2 is drawn toward a circle Cn (n is a natural number) drawn with the center of It is set by the tangent Tn (n is a natural number) drawn from R2 to the circle Cn. .

[0054] The tangent line Tn from the rigidity center R2 of the sub-frame 2 is the line between one side and the other side divided by the above line L. A pair is depicted on both sides.

[0055] Circles Cn centered on the rigidity center R1 of the building frame 1 can be drawn with different radii. There are also multiple tangent lines Tn taken from the rigidity center R2 of the sub-frame 2 so as to be tangent to each of the multiple circles Cn. is.

[0056] The pair of vibration damping devices 3, 3 arranged on both sides of the straight line L are connected to a tangent line T tangent to the circle Cn. The vibration damping effect is oriented in the direction of n.

[0057] Any tangent Tn of any circle Cn, regardless of which tangent Tn of which circle Cn is positioned in the direction of

[0058] The outermost circle with the largest radius among multiple circles Cn around the rigidity center R1 of the building frame 1 (Hereinafter, also referred to as the maximum circle) Cn is the point where the displacement of the torsion D of the top 1b of the building frame 1 is maximum. Therefore, the torsion D is transmitted directly from the top 1b of the building frame 1 to the lower part of the sub-frame 2. The vibration damping device 3 connected to the shaft 2b is attached so as to effectively suppress the torsion D. As long as the vibration damping device 3 can be installed in the area F, the center of rigidity of the sub-frame 2 that is tangent to this maximum circle Cn The direction is set so that vibration damping (torsion suppression) occurs toward the tangent line Tn from R2. It is desirable to set and place it.

[0059] In the case of the oil damper that is expanded and contracted to attenuate vibration, the expansion and contraction direction is the secondary direction. It is directed in the tangent direction Tn from the center of rigidity R2 of the frame 2 to the maximum circle Cn.

[0060] In terms of arrangement, the vibration damping device 3 is arranged in the gap S as shown in FIG. Within the mounting area F of the dynamic damping device 3, one end 3a is connected to the building frame 1, and the other end 3b is connected to the sub-frame. As long as it can be connected to the structure 2, it is in a horizontal position with respect to the ground surface E and is aligned with the above line L. On the other hand, the distance from the line L is shorter at the other end 2b of the sub-frame 2 side, and The vibration damping devices 3, 3 of each sub-frame 2 are in a long, diagonal relationship at the ends 3a. In this connection, the ends 3a are spaced apart on the building frame 1 side, and the other ends 3b are spaced apart on the sub-frame 2 side. It is desirable that the electrodes are arranged in a V-shape in plan view, approaching each other.

[0061] The vibration damping device 3 arranged in this way is capable of suppressing any vibration that occurs between the building frame 1 and the sub-frame 2. Even if the vibration is in a certain state, the vibration is damped by inputting the component force of the vibration. Of course, it has a vibratory effect.

[0062] In short, the arrangement of the vibration damping devices 3 provided between each sub-frame 2 and the building frame 1 is as follows: At least one tangent to any circle Cn centered at the rigidity center R1 of the building frame 1 Tn is oriented so that vibration damping action occurs in the direction passing through the rigidity center R2 of the sub-frame 2. As a result, the vibration damping device 3 damps the vibration of the building frame 1 due to horizontal vibration input. Vibration is efficiently damped through this integrated vibration system, and at the same time, the torsion D occurring in the building frame 1 is This effectively suppresses the

[0063] The action of the vibration control structure of the building frame according to this embodiment will be explained. When a horizontal vibration external force of is generated and this vibration external force is input to the building frame 1, The top 1b of the sub-frame 2 is rigidly connected to the top 2a of the sub-frame 2, so that the building frame 1 fixed to the ground G The lower part 1a of the building frame 1 is fixed, and the lower parts 2b of a pair of sub-frames 2 provided on both sides of the building frame 1 are fixed. Vibration occurs in the integrated vibration system shown in Figure 5, which has the building frame 1 as the source. When vibration is applied, a torsion D occurs around the center of rigidity R1 of the building frame 1.

[0064] The gaps S between the lower part 1a of the building frame 1 and the lower part 2b of each of the pair of sub-frames 2 are provided. The vibration damping device 3 is a building frame 1 that is a spring element, and the sub-frame 2 is a mass element. The dynamic damping device 3 serves as a damping element, and can damp the vibration of the building frame 1 against vibration input. Furthermore, the vibration damping device 3 is arranged around the rigidity center R1 of the building frame 1. As a result, the vibration damping device 3 can also suppress the torsion D of the building frame 1.

[0065] Regarding the suppression of the twist D, in detail, the twist D occurring at the top 1b of the building frame 1 is suppressed by the rigid joint. The lower part 2b of the sub-frame 2 is connected to the lower part 1a of the building frame 1. When the pair of vibration damping devices 3 of each sub-frame 2 is displaced, Torsional force acts along the tangent Tn of the circle Cn around the rigidity center R1 of the building frame 1, and a pair of vibration dampers A compressive force is input to one of the damping devices 3, 3, and a tensile force is input to the other, and the torsional force can be attenuated.

[0066] In this way, a force can be applied to the vibration damping device 3 in the direction of the twist D (tangential direction). Therefore, the torsion D occurring in the building frame 1 can be effectively suppressed.

[0067] The torsional deformation occurring in the building frame 1 is most pronounced at the lower part 2b of the sub-frame 2, which is the free end. Therefore, the lower part 2b of the sub-frame 2, where deformation is predominant, is connected to the building frame 1 via the vibration damping device 3. By connecting it to the lower part 1a of the building frame 1, the torsion D occurring in the building frame 1 can be efficiently and effectively suppressed. It is possible.

[0068] In particular, the vibration damping device 3 is located at the maximum circle Cn where the displacement of the torsion D of the building frame 1 is maximum. The vibration damping effect is generated along the tangent line Tn from the center of rigidity R2 of the sub-frame 2, which is in contact with the By arranging the beams in this way, the torsion D occurring in the building frame 1 can be suppressed most effectively and efficiently. can.

[0069] Furthermore, the lower part 1a of the building frame 1, which is the fixed end of the integrated vibration system, and the sub-frame 2, which is the free end, When the twist phase with the lower part 2b is in the opposite phase, it is arranged along the tangent Tn of the maximum circle Cn. The maximum relative displacement of the torsion is input to the vibration damping device 3 placed in the It can exert a kink-suppressing effect.

[0070] The vibration damping device 3 arranged in this manner not only suppresses the torsion D but also For horizontal vibration input that vibrates the building frame 1, the vibration is calculated based on the component force of the vibration input. This provides dynamic damping and vibration control of the building frame 1.

[0071] 8 and 9 show the structure in which the center of rigidity R1 of the building frame 1 is in a plane along the ground surface E of the building frame 1. FIG. 10 is an explanatory diagram illustrating a case where the centroid is shifted from X.

[0072] In Figure 6, the rigidity center R1 of the building frame 1 is aligned with the centroid. In some cases, this may be the case.

[0073] FIG. 8 shows the structure of the building frame 1, which is connected to the center of rigidity R2 of one of the sub-frames 2 on the straight line L along the length direction of the building frame 1. The distance (La) from the center of rigidity R1 of the building frame 1 is short, and the distance (La) from the center of rigidity R2 of the other sub-frame 2 to the building frame 1 is short. This is the case where the distance (Lb) to the center of rigidity R1 of the frame 1 is large.

[0074] In each of the sub-frames 2, 2, the pair of vibration damping devices 3, 3 are arranged in the upper direction as described above. The vibration is shaped like the letter "V" at an angle to the straight line L and is connected to one of the sub-frames 2. The damping capacity Fa of the damping device 3 and the damping capacity F of the vibration damping device 3 connected to the other sub-frame 2 The relationship with b is set to La×Fb=Lb×Fa.

[0075] FIG. 9 shows the width and length directions from the rigidity center R0 due to the protruding portion 1c (rigidity center Rc) and the like. This is the case of an anisotropic building in which the center of rigidity R1 of the building frame 1 is misaligned.

[0076] Even in this case, the pair of sub-frames 2, 2 Both of the rigidity centers R2 and R2 on the plane along the ground surface E pass through the rigidity center R1 of the building frame 1. The sub-frames 2, 2 are arranged relative to the building frame 1 so as to be arranged on a straight line L, and the straight line L is On L, the distance (La) from the rigidity center R2 of one sub-frame 2 to the rigidity center R1 of the building frame 1, and the other Based on the distance (Lb) from the rigidity center R2 of the sub-frame 2 to the rigidity center R1 of the building frame 1, The damping performance Fa of the vibration damping device 3 connected to the sub-frame 2 and the damping performance Fa of the vibration damping device 3 connected to the other sub-frame 2 are The relationship with the damping performance Fb of the vibration damping device 3 is set to La×Fb=Lb×Fa.

[0077] That is, the position of the center of rigidity R1 of the building frame 1 varies, but the dimensions of the pair of sub-frames 2, 2 The weights are the same, and the centers of rigidity R2, R2 on the plane along the ground surface E of these sub-frames 2 are If they are arranged on a straight line L passing through the rigidity center R1 of the building frame 1, the vibration damping device of one of the sub-frames 2 The damping performance of the vibration damping device 3 of the other sub-frame 2 is higher than that of the rigidity of the building frame 1. By multiplying the ratio of the distance between the center R1 and the center of rigidity R2 of each sub-frame 2, a well-balanced setting can be achieved. This allows for the effective suppression of twists that occur due to imbalances in the structural layout. Cut.

[0078] In the vibration control structure for a building frame according to this embodiment, a pair of sub-frames 2, 2 are As shown in the figure, only the top 2a of the sub-frame 2 is rigidly connected to the top 1b of the building frame 1. As a result, each of these sub-frames 2 is suspended and supported from the top 1b of the building frame 1. It can be done.

[0079] The top 1b of the building frame 1, which is rigidly connected to the top 2a of the sub-frame 2, is the suspension support of the sub-frame 2. If necessary, the rigidity of the top 1b of the building frame 1 is adjusted to the hatched portion in FIG. As shown in region J, the rigidity is set higher than that of other parts of the building frame 1 other than the top 1a. do.

[0080] The rigidity of the top 1b of the building frame 1, which can suspend and support the sub-frame 2, can be improved by, for example, If the amount of steel in the column-beam structure that makes up 1b is increased or if the building frame 1 is made of reinforced concrete, the top 1 Well-known rigidity-enhancing measures can be adopted, such as making only b SRC.

[0081] Also, instead of uniformly increasing the rigidity of the entire top 1b of the building frame 1, As shown in the joint area K, the rigidity is set high only around the area where the rigid joint is performed. Of course, it is also possible to do so.

[0082] FIG. 10 shows a modified example of the vibration control structure for a building frame according to this embodiment. In this example, the lower part 1a of the building frame 1 is attached to the lower part 2b of the sub-frame 2, and the support part 4 is protruding downward. It is provided integrally.

[0083] Above this support part 4, between the lower part 2b of the sub-frame 2, a part suspended from the top 1a of the building frame 1 is provided. At least a part of the weight of the lowered supporting sub-frame 2 is supported by the vibration damping device 3 so as not to interfere with the vibration damping action. The seismic isolation bearing 5 is provided to support the structure without causing any strain. Seismic isolation devices and ball slide mechanisms are used.

[0084] The seismic isolation bearing 5 supports part or all of the weight of the sub-frame 2, so that the sub-frame 2 is rigid. The burden of supporting the entire weight of the sub-frame 2 on the top 1b of the building frame 1 to be joined can be reduced. This allows the rigidity of the top 1b of the building frame 1 to be set low, improving workability. It can be improved. [Explanation of symbols]

[0085] 1 Building frame 1a Lower part of building frame 1b Top of building frame 2 Sub-frame 2a Top of sub-frame 2b Lower part of sub-frame 3. Vibration damping device 3a One end of vibration damping device 3b Other end of vibration damping device Cn Circle centered on the rigidity center of the building frame D. Twist E Ground surface Fa: Damping performance of the vibration damping device connected to one of the sub-frames Fb: Damping performance of the vibration damping device connected to the other sub-frame G Ground L A straight line passing through each rigidity center of a pair of sub-frames and the rigidity center of the building frame La: Distance from the center of rigidity of one sub-frame to the center of rigidity of the building frame Lb: Distance from the center of rigidity of the other sub-frame to the center of rigidity of the building frame R1 Center of rigidity of building frame R2 Rigid center of sub-frame S Gap Tn Tangent to the circle and passing through the center of rigidity of the sub-frame

Claims

1. A vibration control structure for controlling vibrations of a building frame constructed with its lower part fixed to the ground against vibration input, A pair of sub-frames are provided on both sides of the building frame along the height direction of the building frame, with their tops rigidly connected to the top of the building frame and their bottoms spaced above the ground to form an integrated vibration system with the building frame, and in each gap between the bottom of each of these sub-frames and the bottom of the building frame, a vibration damping device is provided, with one end connected to the building frame and the other end connected to the sub-frame, and the device is arranged in a direction along the periphery of the rigid center of the building frame in a plane along the ground surface, A vibration control structure for a building frame, characterized in that the vibration damping device is installed only at the point connecting the lower part of the sub-frame, which is the free end, and the vicinity of the lower part of the building frame, which is the fixed end.

2. The rigidity centers of the pair of sub-frames in a plane along the ground surface are both arranged on a straight line passing through the rigidity center of the building frame, The vibration damping structure of a building frame as described in claim 1, characterized in that the vibration damping devices are arranged in pairs on both sides of the straight line passing through the center of rigidity of the building frame, and are arranged in a ``V'' shape when viewed from above, with one end separated from the other on the building frame side and the other ends close to each other on the sub-frame side, so that a vibration damping effect is generated in the direction passing through the center of rigidity of the sub-frame.

3. The rigidity centers of the pair of sub-frames in a plane along the ground surface are both arranged on a straight line passing through the rigidity center of the building frame, A vibration damping structure for a building frame as described in claim 1 or 2, characterized in that the vibration damping devices are arranged in pairs on both sides of the straight line passing through the rigidity center of the building frame, and the arrangement of these vibration damping devices is such that a vibration damping effect occurs in a direction where at least a tangent to a circle centered on the rigidity center of the building frame passes through the rigidity centers of the pair of sub-frames.

4. A vibration control structure as described in claim 2 or 3, characterized in that when the distance from the rigidity center of one of the sub-frames to the rigidity center of the building frame is La and the distance from the rigidity center of the other sub-frame to the rigidity center of the building frame is Lb, the damping performance Fa of the vibration damping device connected to one of the sub-frames and the damping performance Fb of the vibration damping device connected to the other sub-frame are set to satisfy the relationship La x Fb = Lb x Fa.

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