Vibration control frame

Abstract

To provide a vibration control frame or the like which enables rational earthquake-resistant design and leads to effective use of a space in a building.SOLUTION: A vibration control frame 1 includes a wooden earthquake resisting wall 2, a beam member 3 provided on the wooden earthquake resisting wall 2, and a column member 4. The beam member 3 is arranged along the extending direction in the plane of the wooden earthquake resisting wall 2, and projects to the outside in the extending direction of the wooden earthquake resisting wall 2. A projecting part projecting from the wooden earthquake resisting wall 2 of the beam member 3 and a top part of the column member 4 are connected via a vibration damping member 5 damping vibration in the horizontal direction. The wooden earthquake resisting wall 2 is bound to the foundation 7 by using a binding member in the height direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a seismic damping structure. [Background technology]

[0002] Wooden structures are effective as a means of reducing CO2 emissions as a measure against global warming, and can also improve design by leaving the wood exposed. In addition, with the recent spread of large-scale laminated timber, wooden structures are beginning to be applied to large-scale buildings, one example of which is a wooden rigid frame structure that combines wooden columns and wooden beams in a portal shape (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3990715 Summary of the Invention [Problem to be solved by the invention]

[0004] However, because wooden rigid frame structures have lower rigidity and strength than RC (reinforced concrete) or S (steel frame) structures, it is difficult to rationally and effectively use them as earthquake-resistant elements in buildings. For this reason, measures such as increasing the number of columns or enlarging the cross-sections of the components are currently adopted, but as a result of taking these measures, the area occupied by the columns and beams inside the building increases, reducing the amount of space that can be effectively used inside the building.

[0005] The present invention has been made in consideration of the above problems, and aims to provide a seismic control frame or the like that enables rational earthquake-resistant design and leads to effective use of space within a building. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a seismic control structure comprising a wooden shear wall, a beam member provided on the wooden shear wall, and a column member, wherein the beam member is arranged along the extension direction in the plane of the wooden shear wall and protrudes outward in the extension direction of the wooden shear wall, the protruding portion of the beam member protruding from the wooden shear wall and the top of the column member are connected via a vibration damping member that damps horizontal vibrations, and the wooden shear wall is fastened to the foundation using a vertical fastening material.

[0007] The application of wooden shear walls in this invention can compensate for the weaknesses of wooden rigid frame structures, such as their low rigidity and low strength. Furthermore, by connecting column members and beam members via vibration-damping members, vibration during earthquakes can be reduced. Furthermore, the seismic control frame of this invention incorporates a rocking control mechanism using fastening materials, which appropriately controls the rocking of the wooden shear wall when horizontal forces are applied, thereby minimizing damage to the wooden shear wall. The horizontal rigidity of the wooden shear wall can also be controlled by adjusting the degree of fastening of the fastening materials. These configurations in this invention rationally ensure the rigidity and strength required for a building while reducing the wall volume, thereby improving the earthquake resistance of the entire building through rational earthquake-resistant design. As a result, there is no need to increase the number of columns or the size of the columns and beams, leading to more efficient use of space within the building.

[0008] For example, the beam member may be provided at the top of the wooden shear wall, and the fastening material may be arranged in the range from the foundation to the beam member. Alternatively, the beam member may be provided at the top of the wooden shear wall, and an additional beam member may be provided in the middle of the wooden shear wall in the height direction, the additional beam member may be arranged along the extension direction of the wooden shear wall in its plane and may protrude outward in the extension direction of the wooden shear wall, and the fastening material may be arranged in the range from the foundation to the additional beam member. This allows the fastening materials to be placed over the entire height of the wooden shear wall or up to the middle of the height, making it possible to appropriately control the rotational rigidity of the wooden shear wall after it starts rocking. Also, by connecting the protruding parts of the additional beam members to the column members, the rigidity and seismic control effect of the seismic control frame can be adjusted.

[0009] The fastening material may be disposed on the exterior of the wooden shear wall. Alternatively, the beam members may protrude on both sides of the wooden shear wall in the extension direction, and the fastening material may be disposed on both sides of the wooden shear wall in the extension direction. Placing fastening materials on the exterior of the wooden shear wall may make it easier to control the rotational rigidity after rocking begins. Also, placing fastening materials on both sides of the wooden shear wall in the extension direction may improve the fit of the members.

[0010] The column members are preferably made of wood and equipped with tension members that resist tension forces in the height direction. This allows column members made of wood to resist tensile forces. [Effects of the Invention]

[0011] The present invention makes it possible to carry out rational earthquake-resistant design and to provide a seismic control frame or the like that leads to effective use of space within a building. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a diagram showing an outline of a seismic control frame 1. FIG. [Figure 2] FIG. 2 is a diagram showing a cross section of the seismic isolation structure 1. [Figure 3] A diagram explaining the rocking of wooden earthquake-resistant wall 2. [Figure 4] An example in which beam member 3 is a truss beam. [Figure 5] An example of the placement of fastening material 21. [Figure 6] An example of the placement of wooden earthquake-resistant walls 2. [Figure 7] An example of fixing the top of the fastening material 21 at the middle of the building's height. [Figure 8] FIG. 1 is a diagram showing a seismic control frame 1a. [Figure 9] A diagram showing the seismic isolation structure 1b. [Figure 10] A diagram showing seismic control structure 1c. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0014] Fig. 1 is a diagram showing an outline of a vibration-damping structure 1 according to an embodiment of the present invention, and Fig. 2 is a diagram showing a cross section of the vibration-damping structure 1. Fig. 2(a) is a vertical cross section of the vibration-damping structure 1, and Fig. 2(b) is a horizontal cross section of the vibration-damping structure 1. Fig. 2(b) shows a cross section taken along line AA in Fig. 2(a), and Fig. 2(a) shows a cross section taken along line BB in Fig. 2(b).

[0015] The vibration-damping frame 1 includes a wooden shear wall 2, beam members 3, column members 4, and vibration-damping members 5. The buildings to which the vibration-damping frame 1 is applied are high-rise buildings of 10 stories or more, but it can also be applied to low-rise buildings such as two or three stories. The reference numeral 10 indicates the dimensions of the building. In addition to the vibration-damping frame 1, beams, columns, slabs, etc. (not shown) are also arranged within the building so as not to interfere with the behavior of the wooden shear wall 2.

[0016] The wooden shear wall 2 is a wall formed using wooden materials such as laminated timber, CLT (Cross Laminated Timber), and LVL (Laminated Veneer Lumber), and in this embodiment is arranged in a rectangular cylindrical shape. The wooden shear wall 2 is arranged, for example, in the center of a building when viewed from above, and is used as the core of a stairwell or elevator. This allows for better utilization of the architectural space around the wooden shear wall 2.

[0017] Fastening materials 21 are inserted in the height direction inside the wall body of the wooden shear wall 2. The fastening materials 21 are preferably PC steel bars, but may be replaced with reinforcing bars or the like. The lower ends of the fastening materials 21 are fixed to the foundation 7. The tops of the fastening materials 21 are fixed to the tops of the beam members 3, for example, by tightening nuts 22. Note that the fastening materials 21 can also be fixed using fixing materials other than nuts 22, such as wedges. The tops of the fastening materials 21 can also be fixed to the top of the wooden shear wall 2. In any case, it is sufficient that the fastening materials 21 are arranged over the entire height of the wooden shear wall 2, that is, from the foundation 7 to the beam members 3.

[0018] The fastening material 21 allows the wooden shear wall 2 to rock when a horizontal force such as an earthquake is applied, and also appropriately controls the rocking. This allows the wooden shear wall 2 to rotate in-plane in response to a horizontal force, as shown in Figure 3, preventing damage to the legs of the wooden shear wall 2 due to it sinking into the foundation 7. Rocking can be controlled by adjusting the fastening force of the wooden shear wall 2 to the foundation 7 by tightening the nuts 22, making it possible to appropriately control the stress when the wooden shear wall 2 lifts up from the foundation 7 and the rotational rigidity after it has lifted up (after rocking begins). Furthermore, the restoring force of the fastening material 21 causes the wooden shear wall 2 to return to its original position after an earthquake, reducing residual deformation.

[0019] The beam member 3 is provided at the top of the wooden shear wall 2. In Figure 2(b), the planar position of the beam member 3 is indicated by a dotted line. The beam member 3 is arranged along the extension direction of the wooden shear wall 2 in plan view, and protrudes outward in the extension direction of the wooden shear wall 2. The beam member 3 is formed from a wooden material such as laminated timber. The wooden shear wall 2 and the beam member 3 are rigidly joined using the GIR (Glued-in-Rod) construction method. The beam member 3 has a greater beam depth and higher rigidity than all other beams (not shown) in the building.

[0020] The beam members 3 protrude from both sides of the wooden shear wall 2 in the extension direction, and these protruding portions are connected to the tops of the column members 4 via vibration-damping members 5. The vibration-damping members 5 absorb vibrations during an earthquake by utilizing the difference in horizontal displacement between the wooden shear wall 2 and the column members 4 during an earthquake. It is desirable that the vibration-damping members 5 be velocity-dependent dampers such as oil dampers. Velocity-dependent dampers are also effective against micro-vibrations, improving livability and safety even against vibrations other than those caused by earthquakes, such as wind sway. However, it is also possible to use displacement-dependent dampers such as friction dampers.

[0021] The column members 4 are arranged on the periphery of the building. The column members 4 are formed of wood material such as laminated lumber. The column members 4 are equipped with tension members 41 that resist tensile forces in the height direction. The tension members 41 are, for example, PC steel rods, and are arranged inside the column members 4, with their tops fixed to the tops of the column members 4.

[0022] The column members 4 support the fixed load and live load of the intermediate floors of the building. By having the column members 4 support long-term vertical loads and mechanically separating the wooden shear wall 2 from the surrounding floors, fluctuations in compressive stress in the wooden shear wall 2 due to fluctuations in live load can be avoided, and the compressive force introduced into the wooden shear wall 2 by the fastening members 21 can be more precisely controlled.

[0023] As described above, the vibration-damping frame 1 of this embodiment compensates for the weaknesses of wooden rigid frame structures, namely, low rigidity and low strength, by employing the wooden shear walls 2. Furthermore, by connecting the column members 4 and the beam members 3 via vibration-damping members 5, vibration during an earthquake can be reduced. Furthermore, the vibration-damping frame 1 of this embodiment incorporates a rocking control mechanism using fastening members 21. This appropriately controls the rocking of the wooden shear walls 2 when horizontal forces are applied, thereby minimizing damage to the wooden shear walls 2. The horizontal rigidity of the wooden shear walls 2 can also be controlled by adjusting the degree of fastening of the fastening members 21. This configuration in this embodiment rationally ensures the rigidity and strength required for a building while reducing the wall volume, thereby improving the seismic resistance of the entire building through a rational seismic design. As a result, there is no need to increase the number of columns or the size of the columns and beams, leading to more efficient use of the space within the building.

[0024] Furthermore, in the vibration-damping frame 1 of this embodiment, the wooden shear walls 2, beam members 3, and column members 4 are made of wooden materials, which reduces the weight of the members and makes construction easier. For example, the wooden shear walls 2 can be divided into multiple upper and lower units, which can then be stacked to construct the wooden shear wall 2. Furthermore, by providing the column members 4 with tension members 41 in the height direction, they can resist tensile forces that occur during earthquakes, etc.

[0025] However, the beam members 3 and column members 4 are not limited to wooden materials, and may be made of reinforced concrete, steel, steel reinforced concrete (SRC) or concrete filled steel pipe (CFT) construction. If the beam members 3 are made of steel, they may also be made into truss beams as shown in Figure 4. Furthermore, if the column members 4 are made of reinforced concrete, tension members 41 are placed as needed, but if they are made of steel, tension members 41 are not particularly necessary.

[0026] In the example of Figure 2(b), one fastening material 21 is placed on each side of the horizontal cross section of the wooden earthquake-resistant wall 2, and the fastening materials 21 are provided in the center of each side, but the number and arrangement of the fastening materials 21 can be changed as appropriate so that the rocking of the wooden earthquake-resistant wall 2 is appropriately controlled.

[0027] Furthermore, the fastening materials 21 do not necessarily have to be inserted inside the wooden shear wall 2, as long as they are positioned so that out-of-plane stress is not generated in the wooden shear wall 2. For example, as shown in FIG. 5(a), one fastening material 21 may be placed on each side of the wooden shear wall 2. The top of the fastening material 21 can be fixed to, for example, an expanded portion (not shown) provided at the top of the wooden shear wall 2. Furthermore, as shown in FIG. 5(b), the fastening materials 21 may be placed on both sides of the wooden shear wall 2 in the extension direction. The top of the fastening material 21 is fixed to the top of the beam member 3.

[0028] The placement of the fastening materials 21 has a significant effect on the rotational rigidity of the wooden shear wall 2 after it starts to rock, and it may be easier to control the rotational rigidity by placing the fastening materials 21 on the outside of the wooden shear wall 2, as shown in Figures 5(a) and (b). Also, in the example of Figure 5(b), placing the fastening materials 21 on both sides of the wooden shear wall 2 in the extension direction may improve the fit of the components.

[0029] Furthermore, the shape and layout of the wooden shear walls 2 are not particularly limited. For example, as shown in FIG. 6(a), placing planar wooden shear walls 2 on the periphery of a building can improve the exterior design of the building. As shown in FIG. 6(b), wooden shear walls 2 may be arranged in an H-shape in the center of the building. Furthermore, as shown in FIG. 6(c), a pair of parallel planar wooden shear walls 2 may be arranged in the center and periphery of the building, respectively. In each of the examples shown in FIGS. 6(a) to 6(c), the beam members 3 are installed along the extension direction of the wooden shear walls 2 and protrude on both sides of the extension direction. Furthermore, column members 4 are installed at positions corresponding to both ends of at least some of the beam members 3, and both ends of the beam members 3 are connected to the tops of the column members 4 via vibration-damping members (not shown). Each of the examples shown in FIGS. 6(a) to 6(c) also achieves the same seismic damping effect as this embodiment.

[0030] 7(a), the tops of the fastening members 21 may be fixed at the middle of the building in the height direction. In the example of FIG. 7(a), a beam member 3 is provided at the middle of the wooden shear wall 2 in the height direction, and the tops of the fastening members 21 are fixed to the tops of the beam member 3. Alternatively, as shown in FIG. 7(b), the beam member 3 may be provided at the top of the wooden shear wall 2, but a separate additional beam member 10 may be provided at the middle of the wooden shear wall 2 in the height direction, and the tops of the fastening members 21 may be fixed to the tops of the additional beam member 10. Note that the tops of the fastening members 21 can also be fixed to the wooden shear wall 2 at the height of the bottom surfaces of the beam member 3 or additional beam member 10. In either case, the fastening members 21 can be placed in the range from the bottom of the wooden shear wall 2 to the middle of its height direction, that is, in the range from the foundation 7 to the beam member 3 or additional beam member 10 at the middle of the wooden shear wall 2 in the height direction.

[0031] The length of the fastening material 21 affects the rotational rigidity of the wooden shear wall 2 after rocking begins; the shorter the length, the greater the rotational rigidity after rocking begins, and the longer the length, the smaller the rotational rigidity. Higher rotational rigidity reduces displacement, but increases the stress applied to the legs of the wooden shear wall 2. Therefore, it is important to adjust the attachment position of the top of the fastening material 21 so that the rotational rigidity can be controlled to an appropriate value. In the present invention, the fastening material 21 can be placed over the entire height of the wooden shear wall 2, as shown in Figure 2(a), or placed up to the middle of the height of the wooden shear wall 2, as shown in Figures 7(a) and (b), thereby making it possible to appropriately control the rotational rigidity of the wooden shear wall 2 after rocking begins. In the example of Figure 7(b), the top of the fastening material 21 may be fixed to the top of the beam member 3 or the top of the wooden shear wall 2.

[0032] The additional beam 10 in Figure 7(b) has the same planar arrangement as the beam 3. That is, it is arranged along the extension direction of the wooden shear wall 2 in the plane and protrudes outward in the extension direction of the wooden shear wall 2. The additional beam 10 protrudes on both sides of the extension direction of the wooden shear wall 2, and by connecting these protruding portions to the column members 4, it is possible to adjust the rigidity and seismic control effect of the seismic control frame. For example, in the example of Figure 7(b), both ends of the additional beam 10 are directly connected to the column members 4, which can suppress horizontal displacement in the middle of the building. Furthermore, as shown in Figure 7(c), both ends of the additional beam 10 can be connected to the column members 4 via vibration damping members 5 such as oil dampers, which is expected to improve the seismic control effect. Note that a truss beam similar to that shown in Figure 3 can also be used as the additional beam 10.

[0033] 8(a) and 8(b), the beam members 3 in FIGS. 2(a) and 2(b) may be divided at the center in the longitudinal direction, and the divided beam members 3 may be connected at the division positions via vibration-damping members 5. This is expected to provide an even greater damping effect. The wooden shear walls 2 are also divided at the same planar position as the beam members 3, and in plan view, the wooden shear walls 2 have an L-shaped cross section and are arranged at the four corners of a rectangle. Fastening materials 21 are placed through the center of each side of the L-shape of the wooden shear walls 2.

[0034] 8(a) and (b) show the vibration-damping structure 1a in the same cross section as in Fig. 2(a) and (b), with Fig. 8(b) corresponding to the cross section taken along line AA in Fig. 8(a) and Fig. 8(a) corresponding to the cross section taken along line BB in Fig. 8(b). This also applies to Fig. 9 and 10, which will be described later.

[0035] In this embodiment, the beam members 3 protrude on both sides of the wooden shear wall 2 in the extension direction, but they may also protrude on only one side in the extension direction. For example, the seismic control frame 1b in Figures 9(a) and 9(b) has rectangular tubular wooden shear walls 2 arranged around the periphery of a building, with some of the beam members 3 (horizontal beam members 3 in the example of Figures 9(a) and 9(b)) protruding on only one side in the extension direction of the wooden shear wall 2. This configuration is effective for buildings with a single-sided core floor plan. Note that when the wooden shear walls 2 are arranged at the corners of the building's floor plan, it is also possible for all of the beam members 3 to protrude on only one side in the extension direction of the wooden shear wall 2.

[0036] In addition to the wooden earthquake-resistant walls 2, a rigid frame made of columns and beams with braces installed within it may also be used as an earthquake-resistant element. As shown in the earthquake-resistant frame 1c in Figures 10(a) and 10(b), the space surrounded by the beam members 3 at the top of the building can be utilized to add an additional earthquake-resistant member 11 such as a Tuned Mass Damper (TMD) to the top of the building, further enhancing the earthquake-resistant effect.

[0037] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that those skilled in the art can conceive of various modifications or alterations within the scope of the technical ideas disclosed herein, and it is understood that these modifications also fall within the technical scope of the present invention. [Explanation of symbols]

[0038] 1, 1a, 1b, 1c: Vibration control frame 2: Wood shear wall 3: Beam member 4: Pillar member 5: Vibration damping material 7: Basics 10: Additional beam member 11: Vibration control member 21: Binding material 41: Tensile material

Claims

1. Wooden earthquake-resistant walls and A beam member provided on the wooden earthquake-resistant wall; A pillar member; and The beam members are arranged along the extension direction of the wooden shear wall in a plane and protrude outward from the extension direction of the wooden shear wall, The protruding portion of the beam member protruding from the wooden earthquake-resistant wall and the top of the column member are connected via a vibration damping member that damps horizontal vibrations, A seismic control frame characterized in that the wooden earthquake-resistant wall is fastened to the foundation using fastening materials in the height direction.

2. The beam member is provided at the top of the wooden earthquake-resistant wall, 2. The seismic damping structure according to claim 1, wherein the fastening material is disposed in a range from the foundation to the beam member.

3. The beam member is provided at the top of the wooden earthquake-resistant wall, An additional beam member is provided at the middle of the wooden earthquake-resistant wall in the height direction, The additional beam members are arranged along the extension direction of the wooden shear wall in a plane and protrude outward from the extension direction of the wooden shear wall, 2. The seismic damping structure according to claim 1, wherein the fastening material is arranged in a range from the foundation to the additional beam member.

4. 2. The seismic control structure according to claim 1, wherein the fastening material is disposed outside the wooden earthquake-resistant wall.

5. The beam members protrude on both sides of the wooden shear wall in the extension direction, 5. The seismic damping structure according to claim 4, wherein the fastening material is disposed on both sides of the wooden earthquake-resistant wall in the extension direction.

6. 2. The seismic damping structure according to claim 1, wherein the column members are made of wood and are provided with tension members that resist tensile forces in the height direction.

Images