Building vibration control structure

Abstract

To provide a vibration damping structure for buildings in which V-shaped or inverted V-shaped braces spanning two or more floors are placed on both front and back sides of the column-beam frame, shifting them for each floor, in which when applied to a building having a plurality of floors including a specific floor with a higher floor height than other general floors, the damping effect of braces is sufficiently exerted on each floor.SOLUTION: The vibration damping structure for buildings includes a general brace 10A spanning two or more general floors 1A and 1B, and a specific brace 10B spanning two or more general floors 1B and a specific floor 1C. Each of both ends 11b of the general brace 10A is connected to a column-beam joint 4 in the column-beam frame of the general floors 1A and 1B. The brace member 11 constituting the specific brace 10B has approximately the same length as that constituting the general brace 10A. Each of both ends 11b of the specific brace 10B is connected to an intermediate position of the column 2 in the column-beam frame of the specific floor 1C. At the specific floor 1C, a connecting member 15 is provided that connects each of both ends 11b of the specific brace 10B.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vibration control structure for a building having multiple stories. [Background technology]

[0002] A known conventional vibration control structure for buildings with multiple floors is configured by arranging braces spanning two or more floors on both the front and rear of a column-beam frame, offset for each floor, and the braces are configured in a V-shape or inverted V-shape, with two brace members extending from each end connected to the column side to the top connected to the beam side (see Patent Document 1).

[0003] In such a building's vibration control structure, the braces span two or more stories, so the horizontal displacement acting on the braces due to horizontal vibration of the building caused by earthquakes or strong winds can be relatively large, and the vibration energy of the building can be effectively attenuated by the vibration control dampers installed on the deformable braces.In addition, when using braces that span two or more stories in this way, by arranging the braces on both the front and rear of the column-beam frame while staggering them for each story, each brace can be arranged rationally to save space, while still providing a reliable vibration control effect for each story. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-288923 Summary of the Invention [Problem to be solved by the invention]

[0005] In the vibration-damping structure for a building described in Patent Document 1, both ends of each brace are connected to the column-beam joints of the column-beam frames of each story. Therefore, even when applied to a building with multiple stories, including a specific story that is higher than the other general stories, both ends of each brace are likely to be connected to the column-beam joints of the column-beam frames of each story. In this configuration, the length of the brace members constituting the specific brace that spans two or more stories, including the specific story, is longer than the length of the brace members constituting the general brace that spans two or more stories excluding the specific story. As a result, the length of the brace members constituting such a specific brace could prevent the vibration-damping effect of the specific brace from being fully realized.

[0006] In light of this situation, the main object of the present invention is to provide technology for fully utilizing the vibration control effect of the braces on each story when applied to a building with multiple stories, including a specific story that is higher than the other general stories, in a vibration control structure for a building with multiple stories, in which braces spanning two or more stories are arranged on both the front and rear of the column-beam frame, with the braces being configured in a V-shape or inverted V-shape, with two brace members extending from each end connected to the column side to the top connected to the beam side. [Means for solving the problem]

[0007] A first characteristic configuration of the present invention is a multi-story building in which braces spanning two or more stories are arranged on both the front and rear sides of a column-beam frame while being offset for each story, The brace is configured in a V-shape or an inverted V-shape consisting of two brace members extending from each of the end portions connected to the column side to the top portion connected to the beam side. The plurality of stories includes a specific story whose floor height is greater than that of other general stories, and The braces include a general brace spanning two or more stories excluding the specific story, and a specific brace spanning two or more stories including the specific story, each of the two ends of the general brace is connected to a column-beam joint in the column-beam frame of the general story; the brace members constituting the specific brace have approximately the same length as the brace members constituting the general brace, and both ends of the specific brace are connected to intermediate positions of columns in the column-beam frame of the specific story, The difference is that a connecting member is provided on the specific story to connect both ends of the specific brace.

[0008] According to this configuration, general braces spanning two or more stories, excluding a specific story whose floor height is higher than the other general stories, are configured with two brace members, each extending from its end connected to the beam joint to its top connected to the beam. Meanwhile, specific braces spanning two or more stories, including a specific story whose floor height is higher than the other general stories, are configured with two brace members, each extending from its end connected to the middle of the column in the beam frame of the specific story to its top connected to the beam, rather than from the beam joint. By adopting this configuration, the length of the brace members constituting the specific brace is set to be approximately the same as the length of the brace members constituting the general brace. Therefore, the horizontal displacement acting on the brace due to horizontal vibration of the building caused by earthquakes or strong winds can be made approximately the same for both general braces and specific braces. Furthermore, because both ends of the special braces connected to the middle of the columns are connected by the connecting members, deflection due to the axial force transmitted from the special braces at the middle of the columns to which both ends of the special braces are connected can be suppressed, effectively preventing a decrease in the vibration control effect of the special braces due to the deflection. As a result, the general braces and the special braces can exert equal and sufficient vibration control effects on each story. Therefore, the present invention provides a technology for fully utilizing the vibration control effect of the braces on each floor when applied to a building with multiple floors, including a specific floor that is higher than the other general floors, in a vibration control structure for a building with multiple floors, in which braces spanning two or more floors are arranged on both the front and rear of the column-beam frame, with the braces being configured in a V-shape or inverted V-shape consisting of two brace members extending from each of the two ends connected to the column side to the top connected to the beam side.

[0009] A second characteristic feature of the present invention is that the top of the brace is arranged near the beam and connected to the beam-column joint located to the side of the beam via a vibration damper.

[0010] With this configuration, the top of the brace positioned near the beam is connected to the column-beam joint located to its side via a vibration damper, so that the horizontal displacement between the top of the brace and the column-beam joint on the side end of the beam positioned nearby can be appropriately suppressed by the vibration damper, thereby effectively attenuating the vibration energy of the building.

[0011] A third characteristic configuration of the present invention is that, on the specific story, an adjacent structural face reinforcing brace is provided on an adjacent structural face, which is a structural face of a column-beam frame adjacent to the side of the specific structural face, which is a structural face of a column-beam frame on which both ends of the specific brace are provided, The adjacent structural face reinforcing brace is configured to reinforce the intermediate position of the column to which the end of the specific brace provided on the specific structural face is connected.

[0012] According to this configuration, adjacent structural face reinforcing braces are provided on the adjacent structural faces of the specific story, which is higher than the other general stories, thereby reducing the inter-story displacement of the specific story and suppressing deflection of the columns of the specific story, including the columns to which both ends of the specific brace are connected. Furthermore, both ends of the specific brace provided on the specific structural face are connected by the above-mentioned connecting member, and the intermediate positions of the columns to which at least one of the both ends is connected are reinforced by the adjacent structural face reinforcing brace provided on the adjacent structural face adjacent to the specific structural face. Therefore, deflection due to the axial force transmitted from the specific brace at the intermediate positions of the columns to which both ends of the specific brace are connected can be more effectively suppressed, and a decrease in the vibration control effect of the specific brace due to such deflection can be more effectively prevented. [Brief explanation of the drawings]

[0013] [Figure 1] Elevation view of the vibration control structure for a building according to this embodiment [Figure 2] Side view of the vibration control structure for a building according to this embodiment [Figure 3] Cross section AA of Figure 1 DETAILED DESCRIPTION OF THE INVENTION

[0014] A vibration control structure for a building according to an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are an elevation view and a side view showing a portion of multiple stories 1A, 1B, and 1C in a building 1 in which a vibration control structure according to this embodiment has been constructed. Fig. 3 is a cross-sectional view taken along line AA in Fig. 1, i.e., a view showing a horizontal cross-section at the middle position between the top and bottom of story 1C, the highest of the multiple stories 1A, 1B, and 1C in the building 1. In the following description, the near side in Fig. 1, the left side in Fig. 2, and the lower side in Fig. 3 may be referred to as the front side, and the far side in Fig. 1, the right side in Fig. 2, and the upper side in Fig. 3 may be referred to as the rear side.

[0015] The vibration control structure of this embodiment is applied to a building 1 having multiple floors 1A, 1B, and 1C, such as an office building or an apartment building, and is intended to absorb and attenuate seismic energy and vibration energy acting on the building 1 during earthquakes, strong winds, etc. In this embodiment, an example is shown in which a vibration control structure is constructed for three successive stories 1A, 1B, and 1C in the vertical direction. In the following explanation, of the three stories 1A, 1B, and 1C, the lowest story will be referred to as the first story 1A, the story immediately above it will be referred to as the second story 1B, and the story immediately above that will be referred to as the third story 1C. 1 and 2, building 1 has a structure in which structural surfaces 5A, 5B, 5C of a column-beam frame, each composed of columns 2 and girders 3, are continuous in the vertical direction across multiple stories 1A, 1B, 1C. Each of these multiple column-beam frames is provided with an upper girder 3 that connects a pair of left and right columns 2 arranged at a predetermined distance, and the girder 3 supports the slabs 25 of each story 1A, 1B, 1C. In the building 1, the multiple floors 1A, 1B, 1C include a specific floor 1C whose floor height is greater than the other general floors 1A, 1B. That is, the first floor 1A and the second floor 1B are general floors with approximately the same floor height, while the third floor 1C is a specific floor whose floor height is greater than those of the general floors 1A, 1B.

[0016] Three braces 10A, 10B, and 10C are provided on the structural faces 5A, 5B, and 5C of these three stories 1A, 1B, and 1C. As shown in FIGS. 1 and 2 , each brace 10A, 10B, and 10C is configured in a V-shape or an inverted V-shape, consisting of two brace members 11 extending from each of its end ends 11b connected to the column 2 to its top end 11a connected to the girder 3. Furthermore, the top end 11a of each brace 10A, 10B, and 10C is located near the girder 3 and connected to the column-to-beam joint 4 located on its side via a vibration damper 12, such as an oil damper. As a result, horizontal displacement between the top of each brace 10A, 10B, and 10C and the column-to-beam joint 4 on the side end of the girder 3 located nearby is appropriately suppressed by the vibration damper 12, thereby effectively attenuating the vibration energy of the building 1.

[0017] These three braces 10A, 10B, and 10C are arranged on both the front and rear (left and right in FIG. 2) sides of the column-beam frame, with a staggered arrangement for each of the stories 1A, 1B, and 1C, as shown in Fig. 2. Of these three braces 10A, 10B, and 10C, the first brace 10A and the second brace 10B are configured to span the two stories 1A, 1B, and 1C. That is, the first brace 10A is configured as an inverted V-shape that spans the structural face 5A of the first story 1A and the structural face 5B of the second story 1B directly above it, and is located on the rear side (right side in Figure 2) of these structural faces 5A and 5B as shown in Figure 2. That is, the first brace 10A is a general brace 10A that spans the two general stories 1A and 1B that do not include the specific story 1C and are lower in story height than this specific story 1C. The second brace 10B is configured as a V-shape that spans the structural face 5B of the second story 1B and the structural face 5C of the third story 1C directly above it, and is located on the front side (left side in Figure 2) of these structural faces 5B and 5C as shown in Figure 2. In other words, the second brace 10B is a specific brace 10B that spans the two general stories 1B including the specific story 1C and the specific story 1C. On the other hand, the third brace 10C is configured as an inverted V-shape contained within the structural face 5C of the third story 1C, and is located on the rear side (right side in Figure 2) of the structural faces 5A and 5B as shown in Figure 2.

[0018] As shown in Figure 2, the girders 3 of each story 1A, 1B, 1C are arranged on both the front and rear (left and right in Figure 2) sides of the column-beam frame, with a staggered arrangement for each story 1A, 1B, 1C. This avoids interference between the first brace 10A, the second brace 10B, and the third brace 10C across the two stories 1A, 1B, 1C. That is, the lower girder 3 of the structural face 5A of the first story 1A and the lower girder 3 of the structural face 5C of the third story 1C (the upper girder 3 of the structural face 5B of the second story 1B) are arranged on the rear side within the width of the column 2. On the other hand, the lower girder 3 of the structural face 5B of the second story 1B (the upper girder 3 of the structural face 5A of the first story 1A) and the upper girder 3 of the structural face 5C of the third story 1C are arranged on the front side within the width of the column 2.

[0019] Below, we will explain in detail the configuration of the general brace 10A that spans the two general stories 1A and 1B, which are lower in floor height than the specific story 1C, and the specific brace 10B that spans the two general stories 1B, including the specific story 1C, and the specific story 1C. Because the general braces 10A and the specific braces 10B each span two stories 1A and 1B or two stories 1B and 1C, horizontal vibration of the building 1 caused by earthquakes or strong winds causes a relatively large amount of horizontal displacement on these braces 10A and 10B. This allows the vibration dampers 12 provided for these braces 10A and 10B to effectively attenuate the vibration energy of the building 1. Furthermore, when employing braces 10A and 10B that span two or more stories 1A, 1B, and 1C, the braces 10A and 10B are arranged on both the front and rear sides of the column-beam frame, offset for each story 1A, 1B, and 1C. This allows the braces 10A and 10B to be arranged in a space-saving and rational manner, while reliably exerting vibration control effects on each story 1A, 1B, and 1C.

[0020] The top 11a of the inverted V-shaped general brace 10A is located near the approximate center of the upper girder 3 on the structural face 5B of the second story 1B, which is a general story. Both end portions 11b of the general brace 10A are connected to the column-beam joints 4 on both the lower left and right sides of the structural face 5A of the first story 1A, which is a general story. On the other hand, the V-shaped specific brace 10B uses brace members 11 of the same length as those constituting the general brace 10A. The top 11a of the specific brace 10B is located near the approximate center of the lower girder 3 on the structural face 5B of the second story 1B, which is a general story. Each of the two end portions 11b of the specific brace 10B is connected to the middle of columns 2 on both the left and right sides of the structural face 5C of the third story 1C, which is a specific story that is higher than the general story. Furthermore, each of the two end portions 11b of the specific brace 10B on the third story 1C is connected by connecting members 15 configured as horizontally positioned minor beams. Note that the middle position of the column 2 on the structural face 5C includes not only the center position of the column 2 but also the position sandwiched between the upper and lower column-beam joints 4 of the column 2.

[0021] With this configuration, the amount of horizontal displacement acting on braces 10A, 10B, and 10C due to horizontal vibration of building 1 caused by earthquakes or strong winds is approximately the same for each of general brace 10A and specific brace 10B. Furthermore, because both end portions 11b of specific braces 10B connected to intermediate positions of columns 2 are connected by connecting members 15, deflection due to axial force transmitted from specific braces 10B at the intermediate positions of columns 2 to which both end portions 11b of specific braces 10B are connected is suppressed, effectively preventing a decrease in the vibration control effect of specific braces 10B due to such deflection. As a result, general braces 10A and specific braces 10B exert an equivalent and sufficient vibration control effect on each story 1A, 1B, and 1C.

[0022] Furthermore, as shown in FIGS. 1 and 3, on the third story 1C, which is a specific story, an adjacent structural face 5Cn adjacent to the side of the specific structural face 5C on which both ends 11b of the specific brace 10B are provided has an adjacent structural face reinforcing brace 21. This adjacent structural face reinforcing brace 21 is located on the rear side of the adjacent structural face 5Cn within the width of the column 2 and has a substantially X-shaped brace member 21A connecting the column-beam joints 4 at the four corners. Furthermore, the adjacent structural face reinforcing brace 21 has a horizontal member 21B connected to the center of the brace member 21A and configured as a horizontally oriented small beam connecting the middle positions of the columns 2 on both the left and right sides. In other words, in this adjacent structural face reinforcing brace 21, the horizontal member 21B connects the middle position of the column 2 to which the end 11b of the specific brace 10B provided on the specific structural face 5C is connected, to the center of the brace member 21A, and to the middle position of the column 2 on the opposite side of the specific structural face 5C. Therefore, by adopting such horizontal members 21B, the adjacent structural face reinforcing brace 21 provided on the adjacent structural face 5Cn reinforces the intermediate position of the column 2 to which the end 11b of the specific brace 10B provided on the adjacent specific structural face 5C is connected.

[0023] That is, because the adjacent structural face reinforcing braces 21 are provided on the adjacent structural face 5Cn of the third story 1C, which has a higher story height than the other first and second stories 1A and 1B, the inter-story displacement of the third story 1C is reduced, suppressing deflection of the columns 2 of the third story 1C, including the columns 2 to which both end portions 11b of the specific braces 10B are connected. Furthermore, both end portions 11b of the specific braces 10B provided on the specific structural face 5C are connected by the above-mentioned connecting members 15, and the intermediate position of the column 2 to which at least one of both end portions 11b is connected is reinforced by, in particular, the horizontal member 21B of the adjacent structural face reinforcing braces 21 provided on the adjacent structural face 5Cn adjacent to the specific structural face 5C. Therefore, deflection due to the axial force transmitted from the specific brace 10B at the intermediate position of the column 2 to which each of the two end portions 11b of the specific brace 10B is connected is more effectively suppressed, and a decrease in the vibration control effect of the specific brace 10B due to the deflection is more effectively prevented.

[0024] [Another embodiment] Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied independently, but can also be applied in combination with the configurations of other embodiments.

[0025] (1) In the above embodiment, the tops 11a of the braces 10A, 10B, and 10C are disposed near the girder 3 and connected to the beam-to-column joints 4 located to the sides thereof via vibration dampers 12 such as oil dampers. However, the location and type of vibration dampers 12 can be modified as appropriate. For example, it is possible to interpose a viscous vibration damper between the tops 11a and the girder 3, or to provide vibration dampers that are effective against axial expansion and contraction of the braces 10A, 10B, and 10C in the braces 10A, 10B, and 10C themselves. Furthermore, such vibration dampers may be omitted and the tops 11a of the braces 10A, 10B, and 10C may be directly joined to the girder 3 or the like.

[0026] (2) In the above embodiment, an example was described in which the adjacent structural face 5Cn is provided with the adjacent structural face reinforcing brace 21, but this adjacent structural face reinforcing brace 21 can be omitted or modified as appropriate.

[0027] (3) In the above embodiment, an example was described in which a vibration control structure was constructed for three successive stories 1A, 1B, and 1C, but a vibration control structure can also be adopted for four or more stories. Also, although the general brace 10A and the specific brace 10B are configured to span two stories 1A and 1B or two stories 1B and 1C, these braces may be configured to span three or more stories.

[0028] (4) In the above embodiment, the horizontal member 21B is configured as a small beam in a horizontal position connecting the midpoints of the columns 2 on both the left and right sides of the adjacent structural face 5Cn. However, this horizontal member 21B only needs to connect the midpoint of the column 2 to which one end 11b of the specific brace 10B provided on the specific structural face 5C is connected and the center of the adjacent structural face reinforcing brace 21 provided on the adjacent structural face 5Cn, and it does not have to be connected to the column 2 on the opposite side of the one to which one end 11b of the specific brace 10B is connected on the adjacent structural face 5Cn. Furthermore, when the adjacent structural face reinforcing brace 21 is omitted, the horizontal member 21B can be provided as a small beam in a horizontal position connecting the middle positions of the columns 2 on both the left and right sides of the adjacent structural face 5Cn.

[0029] (5) In the above embodiment, the specific structural face reinforcing brace 21 and the horizontal member 21B included therein are positioned at the rear side within the width of the column 2 on the adjacent structural face 5Cn. However, the position of the specific structural face reinforcing brace 21 and the horizontal member 21B within the width of the column 2 can be changed as appropriate, and they can also be positioned at the front side or in the middle within the width of the column 2. For example, if the horizontal member 21B on the adjacent structural face 5Cn is positioned at the front side within the width of the column 2, similar to the specific brace 10B on the adjacent specific structural face 5C, the end portions 11b of the horizontal member 21B and the specific brace 10B will be connected to the column 2 at the same position within the width. This allows the force transmitted from the specific brace 10B to the column 2 to be transmitted directly to the horizontal member 21B without generating a torsional force on the column 2, thereby providing appropriate support. [Explanation of symbols]

[0030] 1. Building 1A 1st layer (general layer) 1B 2nd layer (general layer) 1C 3rd layer (specific layer) 2 pillars 3 Large beam (beam) 4 Column and beam joint section 5A 1st plane 5B 2nd plane 5C 3rd plane (specific plane) 5Cn adjacent structure 10A First Brace (General Brace) 10B Second brace (specific brace) 10C Third Brace 11 Brace member 11a Top 11b End 12 Vibration damper 15 Connecting member 21 Adjacent structural reinforcement brace 21A Brace member 21B Horizontal member

Claims

1. In a building with multiple floors, braces are placed across two or more floors on both the front and rear of the column-beam frame, offset for each floor. A vibration control structure for a building in which the brace is configured in a V shape or an inverted V shape consisting of two brace members extending from each of both end portions connected to the column side to the top portion connected to the beam side, The plurality of stories includes a specific story whose floor height is greater than that of other general stories, and The braces include a general brace spanning two or more stories excluding the specific story, and a specific brace spanning two or more stories including the specific story, each of the two ends of the general brace is connected to a column-beam joint in the column-beam frame of the general story; the brace members constituting the specific brace have approximately the same length as the brace members constituting the general brace, and both ends of the specific brace are connected to intermediate positions of columns in the column-beam frame of the specific story, A vibration control structure for a building in which connecting members are provided to connect both ends of the specific brace on the specific floor.

2. 2. A vibration control structure for a building according to claim 1, wherein the top of the brace is arranged near the beam and connected to a beam-column joint located on the side of the beam via a vibration control damper.

3. On the specific story, an adjacent structural face reinforcing brace is provided on an adjacent structural face, which is a structural face of a column-beam frame adjacent to the side of the specific structural face, which is a structural face of a column-beam frame on which both ends of the specific brace are provided; 3. The vibration control structure for a building according to claim 1, wherein the adjacent structural face reinforcing brace is configured to reinforce the intermediate position of a column to which the end of the specific brace provided on the specific structural face is connected.

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