WO2020075685A1

WO2020075685A1 - Seismic isolation device

Info

Publication number: WO2020075685A1
Application number: PCT/JP2019/039527
Authority: WO
Inventors: 隆浩森
Original assignee: 株式会社ブリヂストン
Priority date: 2018-10-09
Filing date: 2019-10-07
Publication date: 2020-04-16
Also published as: CN112823251A; JP7333334B2; JPWO2020075685A1; CN112823251B; TW202030426A; TWI781349B

Abstract

Provided is a seismic isolation device that has excellent buckling performance and endurance without losing the required seismic isolation performance. The seismic isolation device is provided with a layered structure (10) made by arranging hard materials (11) and soft materials (12). The layered structure (10) is sectioned into terminal regions (R1), a center region (R2), and intermediate regions (R3). The respective hard materials of a terminal region (R1), the center region (R2), and an intermediate region (R3) are a terminal hard material (111), a center hard material (112), and an intermediate hard material (113). The axial positional relationship of a widthwise outer edge (111e) of the terminal hard material (111), a widthwise outer edge (113e) of the intermediate hard material (113), and a widthwise outer edge (112e) of the center hard material (112) is [widthwise outer edge (111e) > widthwise outer edge (113e) > widthwise outer edge (112e)], and the ratio (W1/W2) of the width W2 between the widthwise outer edges of the center hard material (112) to the width W1 between the widthwise outer edges of the terminal hard material (111) is 0.6 ≤ (W2/W1) ≤ 0.97 or less.

Description

Seismic isolation device

The present invention relates to a seismic isolation device.

The conventional seismic isolation device is provided with a laminated structure in which hard materials and soft materials are alternately arranged in the vertical direction, and the terminal arranged in at least one of the upper and lower end regions of the laminated structure. There is one in which the outer edge in the width direction of the hard material is extended outward in the width direction with respect to the central hard material arranged in the central region of the laminated structure (for example, refer to Patent Document 1). According to the seismic isolation device described in Patent Document 1, even when the laminated structure is elastically deformed in the horizontal direction, the terminal hard material supports the central hard material to cause buckling of the laminated structure. It is possible to suppress local stress concentration that occurs in the portion on the compression side (the end region).

JP, 2014-47926, A

∙ On the other hand, the seismic isolation device protects the structure by lengthening the natural vibration cycle to improve seismic isolation performance.

According to the seismic isolation device described in Patent Document 1, the larger the width of the terminal hard material, the greater the effect of improving buckling. However, if the width of the terminal hard material is too large, when the laminated structure is largely elastically deformed, the outer edge in the width direction of the terminal hard material easily separates from the soft material due to stress concentration, and the surface of durability There was room for improvement. Further, the buckling improvement effect largely depends on the width of the upper and lower end hard materials, but in the seismic isolation device described in Patent Document 1, the natural vibration period of the structure may be shortened.

The object of the present invention is to provide a seismic isolation device having excellent buckling resistance and durability without impairing the required seismic isolation performance.

The seismic isolation apparatus according to the present invention is a seismic isolation apparatus including a laminated structure in which hard materials and soft materials are alternately arranged in the vertical direction, and the laminated structure includes upper and lower sides, respectively. Located between the two end regions, a central region located between the two end regions, and located adjacent the central region and the end regions between the central region and the end regions. The hard material disposed in the end region is divided into two intermediate regions, and the hard material disposed in the end region is at least one end hard material, and the hard material disposed in the central region is at least one center hard material. And the hard material disposed in the intermediate region is at least one intermediate hard material, and the widthwise outer edge of the terminal hard material is positioned more widthwise outer than the widthwise outer edge of the central hard material. And the intermediate The widthwise outer edge of the quality material is located at the widthwise outer side than the widthwise outer edge of the central hard material and at the widthwise inner side than the widthwise outer edge of the terminal hard material, and further, the widthwise direction of the terminal hard material. The ratio (W2 / W1) of the width W2 between the outer edges in the width direction of the central hard material with respect to the width W1 between the outer edges is 0.6 ≦ (W2 / W1) ≦ 0.97. According to the seismic isolation device of the present invention, the seismic isolation device has excellent buckling resistance and durability without impairing the required seismic isolation performance.

In the seismic isolation device according to the present invention, a plurality of the intermediate hard materials are arranged in the intermediate region, and the widths of the plurality of intermediate hard materials decrease from the end region side toward the central region side. It is preferable that In this case, it is possible to further suppress the local stress concentration that occurs in the terminal region and further improve the durability.

In the seismic isolation apparatus according to the present invention, it is preferable that a plurality of the central hard materials are arranged in the central region, and the plurality of central hard materials have the same width. In this case, even if the central hard material is plural, the required seismic isolation performance can be more reliably exhibited.

In the seismic isolation apparatus according to the present invention, it is preferable that a plurality of terminal hard materials are arranged in the terminal region, and the plurality of terminal hard materials have the same width. In this case, it is possible to further suppress the local stress concentration that occurs in the terminal region and further improve the buckling resistance and durability.

In the seismic isolation device according to the present invention, a plurality of terminal hard materials are arranged in the terminal region, and the widths of the plurality of terminal hard materials increase from the central region side toward the terminal region side. Can be one.

In the seismic isolation device according to the present invention, in a vertical cross-sectional view of the seismic isolation device, the end hard material adjacent to the intermediate hard material, the intermediate hard material, and the central hard material adjacent to the intermediate hard material. The angle A on the acute angle side formed by the virtual ridge line connecting the outer edges in the width direction with respect to the vertical direction may be 45 ° to 80 °. In this case, buckling can be made difficult to occur.

In the seismic isolation device according to the present invention, the virtual ridgeline may be a straight line in a vertical sectional view of the seismic isolation device. In this case, it is possible to further prevent buckling.

In the seismic isolation apparatus according to the present invention, the ratio (H3 / H0) of the vertical height H3 of the intermediate region to the vertical height H0 of the laminated structure is 0.01 to 0.1. can do. In this case, the outer edge in the width direction of the terminal hard material is less likely to peel off from the soft material due to stress concentration, and the durability is improved.

In the seismic isolation device according to the present invention, the outer surface shape of the laminated structure may be a combination of linear shapes in a vertical sectional view of the seismic isolation device. In this case, since the proportion of the soft material occupied can be reduced as compared with the case where the outer surface has a curved shape, seismic isolation performance can be improved.

According to the present invention, it is possible to provide a seismic isolation device having excellent buckling resistance and durability without impairing the required seismic isolation performance.

It is a sectional view showing roughly the seismic isolation device concerning a 1st embodiment of the present invention in a section including the up-and-down direction. It is sectional drawing which shows the seismic isolation apparatus which concerns on 2nd Embodiment of this invention in the cross section including the up-down direction schematically.

The seismic isolation device according to various embodiments of the present invention will be described below with reference to the drawings. In the following description, substantially the same items are denoted by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, reference numeral 1A is a seismic isolation device according to the first embodiment of the present invention. The seismic isolation device 1A includes a laminated structure 10. The laminated structure 10 includes hard materials 11 and soft materials 12 alternately arranged in the vertical direction. The seismic isolation device 1A has a central axis O that extends in the vertical direction, and the central axis O can be erected along the vertical axis.

A lower plate 20 is fixed to the lower end of the laminated structure 10. The lower plate 20 can be fixed to a foundation (not shown) that supports a structure (not shown) such as a building, a bridge, or a house. An upper plate 30 is fixed to the upper end of the laminated structure 10. The upper plate 30 can be fixed to the structure, for example. In this embodiment, the lower plate 20 and the upper plate 30 are formed of circular steel plates.

The hard material 11 is a layer having rigidity. In the present embodiment, the hard material 11 is a circular metal plate, specifically, a circular steel plate. In this embodiment, the soft material 12 is a circular elastic plate, specifically, a circular rubber plate. In this embodiment, the hard material 11 and the soft material 12 have the same thickness. However, the thicknesses of the hard material 11 and the soft material 12 can be changed appropriately. Further, in the present embodiment, the widthwise outer edge 11e of the hard material 11 is covered with the soft material 12 by the outer layer 13. The outer layer 13 is a cylindrical rubber plate. However, the outer layer 13 can be omitted.

As shown by the broken line region in FIG. 1, the laminated structure 10 includes two end regions R1 located on the upper side and the lower side, respectively, and a central region R2 located between the two end regions R1 and the center. It is partitioned between the region R2 and the terminal region R1 into two intermediate regions R3 located adjacent to the central region R2 and the terminal region R1. Here, the terminal region R1 is at least one of a virtual region continuous downward from the upper end of the laminated structure 10 or a virtual region continuous upward from the lower end of the laminated structure 10. A region. Further, the central region R2 is a virtual region located at the center of the laminated structure 10 in the vertical direction. Further, the intermediate region R3 is at least one of a virtual region continuous downward from the lower end of the upper end region R1 or a virtual region continuous upward from the upper end of the lower end region R1. It is a virtual region that does not include the central region R2.

For example, the terminal region R1, the central region R2, and the intermediate region R3 are respectively one vertical height H1 and the other vertical height H1 ′ of the terminal region R1, the vertical height H2 of the central region R2, and the intermediate region. It is defined by one vertical height H3 of R3 and the other vertical height H3 '. In this case, the vertical height H0 of the laminated structure 10 is defined by H0 = H1 + H1 ′ + H2 + H3 + H3 ′. As a specific example, H1 / H0 = 0.01 to 0.24, H1 ′ / H0 = 0.01 to 0.24, H2 / H0 = 0.5 to 0.96, H3 / H0 = 0.01 to 0.24 and H3 ′ / H0 = 0.01 to 0.24.

Further, in the laminated structure 10, the hard material arranged in the terminal region R1 is at least one terminal hard material 111. In the laminated structure 10, the hard material arranged in the central region R2 is at least one central hard material 112. Further, in the laminated structure 10, the hard material arranged in the intermediate region R3 is at least one intermediate hard material 113. The seismic isolation device 1A according to the present embodiment has one terminal hard material as the terminal hard material 111. Further, the seismic isolation device 1A has a plurality (10 in the present embodiment) of central hard materials as the central hard material 112. In this embodiment, the central hard material 112 is the same central hard material. Further, the seismic isolation device 1A has one intermediate hard material as the intermediate hard material 113.

In the laminated structure 10, the widthwise position of the widthwise outer edge 111e of the terminal hard material 111, the widthwise outer edge 113e of the intermediate hard material 113, and the widthwise outer edge 112e of the central hard material 112 is as follows. The relationship (1) is satisfied.

Width outer edge 111e of terminal hard material 111> Width outer edge 113e of intermediate hard material 113> Width outer edge 112e of central hard material 112 (1)

Specifically, the terminal hard material 111 has a widthwise outer edge 111e located in the widthwise outer side than the widthwise outer edge 112e of the central hard material 112 in any case. For example, when there are a plurality of end hard materials 111, the width direction outer edge 111e of the end hard material 111 located on the innermost side in the width direction of the width direction outer edge 111e is located in the width direction outer side than the width direction outer edge 112e of the central hard material 112. Position it. Further, when there are a plurality of central hard materials 112, the widthwise outer edge 111e of the terminal hard material 111 located at the innermost side in the width direction of the widthwise outer edge 111e is wider than any widthwise outer edge 112e of the central hard material 112. Position it outside in the direction. In addition, the intermediate hard material 113 has a widthwise outer edge 113e located in a widthwise outer side than the widthwise outer edge 112e of the central hard material 112 and a widthwise inner side than the widthwise outer edge 111e of the terminal hard material 111 in any case. ing. For example, when there are a plurality of intermediate hard materials 113, the widthwise outer edge 113e of the intermediate hard material 113 whose widthwise outer edge 113e is located on the innermost side in the widthwise direction is more outward than the widthwise outer edge 112e of the central hard material 112 in the widthwise direction. Position it. Further, when there are a plurality of central hard materials 112, the widthwise outer edge 113e of the intermediate hard material 113 positioned on the innermost side in the width direction of the widthwise outer edge 113e is wider than any widthwise outer edge 112e of the central hard material 112. Position it outside in the direction. Further, when the intermediate hard material 113 is plural, the widthwise outer edge 113e of the intermediate hard material 113 located on the outermost side in the widthwise direction of the widthwise outer edge 113e is located more inward in the widthwise direction than the widthwise outer edge 111e of the terminal hard material 111. Position it. Further, when there are a plurality of terminal hard materials 111, the width direction outer edge 113e of the intermediate hard material 113 located on the outermost side in the width direction of the width direction outer edge 113e is wider than the width direction outer edge 111e of any of the terminal hard materials 111. Position inward.

Further, the width between the widthwise outer edges 111e of the terminal hard material 111 is W1 (hereinafter, also referred to as "width W1 of the terminal hard material 111"), and the width between the widthwise outer edges 112e of the central hard material 112 is W2. (Hereinafter, also referred to as “width W2 of the central hard material 112”), the ratio α (= W2 / W1) of the width W2 of the central hard material 112 to the width W1 of the terminal hard material 111 has the following relationship. (2) is satisfied.

0.6 ≦ (W2 / W1) ≦ 0.97 ... (2)

In the present embodiment, the hard material 11 is a circular plate. Further, in the present embodiment, the terminal hard material 111, the intermediate hard material 113, and the central hard material 112 are arranged coaxially on the central axis O. In the present embodiment, the width W1 of the terminal hard material 111, the width W2 of the central hard material 112, and the width W3 between the widthwise outer edges 113e of the intermediate hard material 113 (hereinafter, also referred to as “width W3 of the intermediate hard material 113”). Is the diameter of the hard material 11. That is, in the present embodiment, the ratio α of the width W2 of the central hard material 112 to the width W1 of the terminal hard material 111 is the ratio (φ2 / φ1) of the diameter φ2 of the central hard material 112 to the diameter φ1 of the terminal hard material 111. ) Can be replaced.

Note that the hard material 11 is not limited to a circular plate, and a deformed plate such as a polygon can be adopted. In this case, the width W1 of the terminal hard material 111, the width W2 of the central hard material 112, and the width W3 of the intermediate hard material 113 can be the diameter of the circumscribed circle of the hard material 11. The ratio α (= W2 / W1) is preferably 0.6 or more. More preferably, the value of α is 0.7 to 0.92. In this case, seismic isolation performance can be sufficiently secured. When there are a plurality of hard materials, W1 is the maximum width of the terminal hard material 111, and W2 is the minimum width of the central hard material 112.

Further, specific examples of the width W1 of the terminal hard material 111, the width W2 of the central hard material 112, and the width W3 of the intermediate hard material 113 are W2 / W1 = 0.6 to 0.97, W3 / W1 = 0.61. .About.0.96.

According to the seismic isolation device of the present embodiment, since the terminal hard material 111 has the width-direction outer edge 111e located outside the width-direction outer edge 112e of the central hard material 112, the laminated structure 10 Even when is elastically deformed abruptly, the terminal hard material 111 supports the central hard material 112, which causes the buckling of the laminated structure 10 and locally occurs in the compression side portion (terminal region R1). Stress concentration can be suppressed.

On the other hand, the inventor of the present application has confirmed that the buckling property is improved when only the width W1 of the terminal hard material 111 is simply increased. However, simply increasing W1 shortens the natural vibration period of a structure such as a building, so that there is a problem that the original seismic isolation performance cannot be exhibited. Therefore, as a result of earnest and testing / research, the inventor of the present application, when a large width W1 of the terminal hard material 111 is secured, if the width W2 of the central hard material 112 is reduced, the natural vibration period of the structure is shortened. We have come to realize that the phenomenon can be suppressed. Specifically, when the ratio α of the width W2 of the central hard material 112 to the width W1 of the terminal hard material 111 is 0.97 or less, the buckling characteristics are maintained while keeping the natural vibration period of the structure long. I confirmed to improve. Therefore, according to the seismic isolation apparatus 1A according to the present embodiment, the ratio α of the width W2 of the central hard material 112 to the width W1 of the terminal hard material 111 is 0.97 or less, which improves the buckling performance. However, the required seismic isolation performance is not impaired. Further, when the ratio α of the width W2 of the central hard material 112 to the width W1 of the terminal hard material 111 is set to less than 0.6, the width of the central hard material 112 becomes small, and the buckling performance and the load supporting ability deteriorate. On the other hand, when the ratio α of the width W2 of the central hard material 112 to the width W1 of the terminal hard material 111 is set to 0.6 or more, the buckling performance improving effect is obtained and the load supporting ability is not lowered.

In addition, according to the seismic isolation apparatus 1A of the present embodiment, the intermediate hard material is provided in the two intermediate regions R3 located between the central region R2 and the terminal region R1 and adjacent to the central region R2 and the terminal region R1. 113 is arranged, and the intermediate hard material 113 has a widthwise outer edge 113e located outside the widthwise outer edge 112e of the central hard material 112 in the widthwise direction and inside the widthwise outer edge 111e of the terminal hard material 111 in the widthwise direction. Therefore, even when the laminated structure 10 is largely elastically deformed, local peeling does not occur on the compression side of the widthwise outer edge 111e of the terminal hard material 111 adjacent to the intermediate hard material 113.

In short, when compared with a seismic isolation device having the same horizontal rigidity and α exceeding 0.97, the seismic isolation device 1A according to this embodiment has improved buckling resistance. Further, when compared with the seismic isolation device in which the width W1 of the terminal hard material 111 is the same and α exceeds 0.97, the seismic isolation device 1A according to the present embodiment can have a longer natural vibration period. Further, when compared with a seismic isolation device in which the width W2 of the central hard material 112 is the same and α exceeds 0.97, the seismic isolation device 1A according to the present embodiment shows that the widthwise outer edge 111e of the terminal hard material 111 is compressed. Local peeling that occurs on the side can be suppressed.

Therefore, according to the seismic isolation device 1A of the present embodiment, the seismic isolation device is excellent in buckling resistance and durability while maintaining the load bearing ability without impairing the required seismic isolation performance.

By the way, as described above, in the present embodiment, the terminal region R1 includes one terminal hard material 111. The central region R2 contains a plurality of central hard materials 112. In the present embodiment, the widths W2 of the central hard material 112 are the same. The intermediate region R3 includes one intermediate hard material 113.

However, according to the present invention, the seismic isolation device 1 can have at least one terminal hard material as the terminal hard material 111 in the terminal region R1. In this case, the widthwise outer edge 111e of each terminal hard material 111 is positioned outside the widthwise outer edge 112e of the central hard material 112 in the width direction. Furthermore, it is preferable that the width W1 of each terminal hard material 111 becomes smaller toward the intermediate region R3 side.

Also, the seismic isolation device 1 may have at least one central hard material as the central hard material 112 in the central region R2. In this case, each central hard material 112 is preferably the same central hard material.

Further, the seismic isolation device 1 may have at least one intermediate hard material as the intermediate hard material 113 in the intermediate region R3. In this case, it is preferable that each intermediate hard material 113 is located outside the widthwise outer edge 112e of the central hard material 112 in the widthwise direction and inside the widthwise outer edge 111e of the terminal hard material 111 in the widthwise direction. Further, it is preferable that the width W3 of the intermediate hard material 113 becomes smaller from the end region R1 side toward the central region R2 side.

Specific examples of the number N1 of the terminal hard material 111, the number N2 of the central hard material 112, and the number N3 of the intermediate hard material 113 include 1 to 10 for N1 and 1 to 3 for N3.

Here, with reference to FIG. 1, the phantom demarcation line in each of the end region R1, the central region R2, and the intermediate region R3 in a vertical cross-sectional view (a state viewed in a cross-section including the central axis of the seismic isolation device). The description will be given using L1A to L3A and virtual partition lines L1B to L3B.

The partition line L1A is a partition line that passes through the fixing surfaces of the lower plate 20 and the soft material 12 adjacent to the lower plate 20. The partition line L3A is a partition line that passes through the soft material 12 between the lower end hard material 111 and the intermediate hard material 113 adjacent to the lower end hard material 111, and divides the soft material 12 into upper and lower parts. . The partition line L2A is a partition line that passes through the lower end surface of the lowermost central hard material 112.

The partition line L1B is a partition line that passes through the fixing surfaces of the upper plate 30 and the soft material 12 adjacent to the upper plate 30. The partition line L3B is a partition line that passes through the soft material 12 between the upper terminal hard material 111 and the intermediate hard material 113 adjacent to the terminal hard material 111, and divides the soft material 12 into upper and lower parts. The division line L2B is a division line that passes through the upper end surface of the uppermost central hard material 112.

The two end regions R1 are divided as follows. The lower end region R1 is partitioned by the partition line L1A and the partition line L3A. The upper end region R1 is partitioned by the partition line L1B and the partition line L3B.

The central region R2 is partitioned by the partition line L2A and the partition line L2B.

The two intermediate areas R3 are divided as follows. The lower intermediate region R3 is partitioned by the partition line L3A and the partition line L2A. The intermediate region R3 on the upper side is partitioned by the partition line L3B and the partition line L2B.

In the seismic isolation device 1A according to the present embodiment, a plurality of central hard materials 112 are arranged in the central region R2, and it is preferable that the plurality of central hard materials 112 have the same width W2. In this embodiment, as described above, the widths W2 of the plurality of central hard materials 112 are the same. In this case, even if the central hard material 112 is plural, the required seismic isolation performance can be exhibited more reliably.

Further, in the seismic isolation device 1A according to the present embodiment, the ratio β (= H3 / H0) of the vertical height H3 of the intermediate region R3 to the vertical height H0 of the laminated structure 10 is 0.01 to 0. It can be. If β is less than 0.01 or β is more than 0.1, the effect of suppressing buckling is small. In this embodiment, β is a numerical value in the range of 0.01 to 0.1. Therefore, according to the present embodiment, it is possible to make buckling less likely to occur.

The vertical height H2 of the central region R2 is preferably H2 / H0 = 0.50 to 0.96. In this case, a sufficient seismic isolation function can be achieved. Further, in this case, in the laminated structure 10, H2 is (0.5 to 0.96) × H0 in the central region R2, and the vertical height H3 (H3 ′) of the intermediate region R3 is (0. 01 to 0.1) × H0 is defined as the intermediate region R3, and the region outside these regions is defined as the terminal region R1. The terminal hard material 111, the central hard material 112, and the intermediate hard material 113 are arranged in each of these areas R1 to R3. Preferably. More preferably, a region of H2 of 0.5 to 0.96 × H0 is a central region R2, H3 (H3 ′), and a region of 0.01 to 0.1 × H0 is an intermediate region R3, H1 (H1 ′). ) Is a region of 0.01 to 0.24 × H0 as the end region R1.

Next, in FIG. 2, reference numeral 1B is a seismic isolation device according to the second embodiment of the present invention. In the present embodiment, the terminal region R1 includes a plurality of (two in the present embodiment) terminal hard materials 111. In this embodiment, the terminal hard material 111 is the same terminal hard material, and the width W1 of the terminal hard material 111 is the same, respectively. The central region R2 includes a plurality (10 in this embodiment) of the central hard material 112. In this embodiment, the central hard material 112 is the same central hard material, and the width W2 of the central hard material 112 is the same, respectively. The intermediate region R3 includes a plurality (two in the present embodiment) of intermediate hard material 113. In the present embodiment, the width W3 of the intermediate hard material 113 decreases from the end region R1 side toward the central region R2 side. In the present embodiment, the widthwise outer edge 113e of each intermediate hard material 113 is positioned outside the widthwise outer edge 112e of the central hard material 112 in the widthwise direction and inside the widthwise outer edge 111e of the terminal hard material 111 in the widthwise direction.

In the seismic isolation device 1B according to the present embodiment, a plurality of intermediate hard materials 113 are arranged in the intermediate region R3, and the width W3 of the intermediate hard materials 113 is from the end region R1 side to the central region R2 side. It is preferable that it becomes smaller toward In the present embodiment, the width W3 of the plurality of intermediate hard materials 113 becomes smaller from the end region R1 side toward the central region R2 side. In this case, local stress concentration that occurs in the terminal region R1 can be further suppressed, and durability can be further improved.

In the seismic isolation device 1B according to this embodiment, a plurality of terminal hard materials 111 are arranged in the terminal region R1, and it is preferable that the plurality of terminal hard materials 111 have the same width W1. In this embodiment, the widths W1 of the plurality of terminal hard materials 111 are the same. In this case, since the plurality of terminal hard materials 111 are used, it is possible to further suppress local stress concentration occurring in the terminal region R1 and further improve the buckling resistance and durability.

In the seismic isolation device 1B according to the present embodiment, the widthwise outer edges of the terminal hard material 111 adjacent to the intermediate hard material 113, the two intermediate hard materials 113, and the central hard material 112 adjacent to the intermediate hard material 113, respectively. The virtual ridge line L formed by connecting 111e, 113e, and 112e is assumed to have an acute angle A of 45 ° to 80 ° with respect to the vertical direction in the vertical sectional view of the seismic isolation device 1B. You can If the angle A is less than 45 °, the effect of suppressing buckling is small. When the angle A exceeds 80 °, the effect of suppressing buckling is small, and local peeling easily occurs on the compression side of the outer edge 111e in the width direction of the terminal hard material 111. According to the present embodiment, the virtual ridge line L has an acute angle A of 45 ° to 80 ° with respect to the vertical direction in the vertical sectional view of the seismic isolation device 1B. In the present embodiment, the angle A is a numerical value in the range of 45 ° to 80 °. Therefore, according to the present embodiment, the effect of improving buckling is particularly high.

Particularly, in the seismic isolation device 1B according to the present embodiment, the virtual ridge line L is a straight line in the vertical cross-sectional view of the seismic isolation device 1B. In this case, it is possible to further prevent buckling.

As described above, according to the embodiments of the present invention, it is possible to provide a seismic isolation device having excellent buckling performance and durability without impairing the required seismic isolation performance.

In the present embodiment, the outer surface shape (contour shape) of the laminated structure 10 is a combination of linear shapes in the vertical sectional view of the seismic isolation device. In this case, in the vertical cross-sectional view, the contour shape of the laminated structure 10 has a large difference between the widthwise outer edge 111e of the terminal hard material 111 and the widthwise outer edge 112e of the central hard material 112, that is, shown in FIG. Thus, the shape is scooped toward the central axis O. Therefore, according to the present embodiment, the ratio of the soft material to the outer surface can be reduced as compared with the curved surface, so that the seismic isolation performance can be improved. However, as another seismic isolation device according to the present invention, in the vertical cross-sectional view of the seismic isolation device, the widthwise outer edge 111e of the terminal hard material 111 adjacent to the intermediate hard material 113, and the widthwise outer edge of the intermediate hard material 113 are adjacent. In some cases, a virtual ridge line that connects the widthwise outer edge 112e of the central hard material 112 adjacent to the intermediate

hard material

113 and 113e has a curved shape that is convex toward the central axis O. That is, according to the present invention, in the vertical cross-sectional view of the seismic isolation device, the outer surface shape of the laminated structure 10 is a curved shape that is convex toward the central axis O, such as an arcuate cross-section or an arc-like shape. Is also included.

The natural vibration period becomes shorter as the proportion of the soft material 12 increases. Therefore, it is preferable to suppress the proportion occupied by the soft material 12. According to the seismic isolation device according to the present invention, in the vertical cross-sectional view of the seismic isolation device, the contour shape of the laminated structure 10 is a curved shape convex toward the central axis O, rather than the seismic isolation device. The proportion occupied by the soft material 12 decreases. Therefore, the seismic isolation device according to the present invention can exert more seismic isolation performance than the seismic isolation device having the curved outer surface.

The above description merely discloses some embodiments of the present invention, and various modifications can be made according to the claims. For example, according to the present invention, the seismic isolation device may include a plug (core material). Specifically, in each of the embodiments, a plug extending along the central axis O can pass through the central portion of the laminated structure 10. The plug is preferably made of a metal such as lead or tin. The various configurations adopted in the above-described embodiments can be appropriately replaced with each other. For example, in the seismic isolation device 1B according to the second embodiment, the widths W1 of the plurality of terminal hard materials 111 are the same, but the widths W1 of the plurality of terminal hard materials 111 are the same as those of the second embodiment. Similar to the intermediate hard material 113, it can be reduced from the end region R1 side toward the central region R2 side. That is, according to the present invention, when the plurality of terminal hard materials 111 are arranged in the terminal region R1, the width W1 of the plurality of terminal hard materials 111 is increased from the central region R2 side toward the terminal region R1 side. It can also be made larger.

(analysis)
In order to confirm the effect of the seismic isolation apparatus according to the present invention, the FEM (Finite Element Method) analysis based on W2 / W1 (hereinafter, also referred to as "FEM analysis based on width ratio") and the angle A of the virtual ridge line L are performed. Based on FEM analysis (hereinafter, also referred to as “angle-based FEM analysis”), two types of analysis were performed. In the FEM analysis, buckling strain, breaking strain and natural vibration period were verified. Marc analysis software manufactured by MSC Software was used for the FEM analysis.

In the FEM analysis, an analysis model that reproduces the contour shape of the laminated structure 10 according to the first embodiment of the present invention was used. In the FEM analysis based on the width ratio, six analytical models were created. Further, in the FEM analysis based on the angle, five analytical models were created. The input load used in these FEM analyzes is 1300 kN.

The hard material mesh is a tetrahedron with 50 to 120 mm on each side, and the number of meshes is 54. The mesh of the soft material was a tetrahedron having 50 to 120 mm on each side and the number of meshes was 54. Further, the following [Table 1] shows the parameters of the analytical model.

[Table 2] below shows the buckling performance, durability performance (breaking performance) and seismic isolation performance evaluated based on the results of the FEM analysis based on the width ratio. Here, the "buckling strain" is the strain (%) when the analytical model is buckled, and the strain mainly occurs in the terminal region. The "improved buckling strain" is the buckling strain of a conventional laminated structure (a laminated structure having a related performance of R = 1 in this analysis) that does not include the numerical range of the seismic isolation device according to the present invention. Is the ratio of the buckling strain (%) of the analysis model to be analyzed, where Therefore, in this evaluation, it is determined that the larger the value of the improved buckling strain, the less likely buckling occurs and the better the buckling performance. The “break strain” is the strain (%) when the soft material breaks, and the strain mainly occurs in the terminal region. Therefore, in this evaluation, it is determined that the larger the value of the strain at break, the less likely it is to break and the better the break performance. “NA” is an unusable value. Further, the "100% equivalent period" T is obtained as follows. When a displacement (x) -load (y) graph of a laminated structure is drawn, it usually has a loop shape. Here, when the + (plus) displacement x position on the loop and the-(minus) displacement x position on the loop are connected by a straight line, the inclination of this straight line is k. Then, it is obtained by T = 2π√ (m / k) (m is the mass of the laminated structure). Therefore, in this evaluation, it is determined that the larger the value of the 100% equivalent period, the better the seismic isolation performance. In [Table 2], when the buckling strain is 400% or more, the result is ⊚, which is evaluated as good. Further, when the structure is improved by 15% or more as compared with the conventional structure, it is evaluated as ◯, which is generally good. Furthermore, x is the other, and is evaluated as having room for improvement.

Referring to Table 2, in the analysis model of W2 / W1 = 0.55, there is room for improvement in the evaluation of durability performance and seismic isolation performance, while in the analysis model of 0.6 ≦ W2 / W1 It was confirmed that the performance and seismic isolation performance were good. Further, in the analysis model of W2 / W1 = 0.98 or more, there is room for improvement in the evaluation of the buckling performance, while in the analysis model of W2 / W1 ≦ 0.97, the buckling performance is good. It was confirmed that there was. Therefore, from these evaluation results, if the analysis model is in the range of 0.6 ≦ W2 / W1 ≦ 0.97, the buckling performance, the durability performance (breaking performance) and the seismic isolation performance are all good performances. It is clear that there is.

Also, [Table 3] below shows the buckling performance evaluated based on the result of the FEM analysis based on the angle. Here, "buckling strain" and "improved buckling strain" are the same as in [Table 2]. The "end tensile strain" refers to the strain applied to the soft material in contact with the end portion of the outermost hard material (the side opposite to the central portion). The smaller this value, the better. Furthermore, in Table 3, the evaluations indicated by ⊚, ◯ and × are the same as those in [Table 2].

Referring to Table 3, in the analysis model in which the angle A of the virtual ridge L is 40 ° or less and the analysis model in which the angle A is 85 °, there is room for improvement as the evaluation of the buckling performance and the roll-up performance. In the analytical model in which the angle A of the virtual ridge L is 45 ° to 80 °, it was confirmed that the buckling performance and the curling performance are good. Therefore, from these evaluation results, it is apparent that the buckling performance is good if the analysis model is such that the angle A of the virtual ridge L is in the range of 40 ° to 85 °.

1A: seismic isolation device (first embodiment), 1B: seismic isolation device (second embodiment), 10: laminated structure, 11: hard material, 111: end hard material, 112: central hard material, 113 : Intermediate hard material, 111e: widthwise outer edge of terminal hard material, 112e: widthwise outer edge of central hard material, 113e: widthwise outer edge of intermediate hard material, 12: soft material, A: angle, H0: of laminated structure Vertical height, H3: Vertical height of the intermediate region, L: Virtual ridge line, ΔL1: Difference between the widthwise outer edge of the terminal hard material and the widthwise outer edge of the intermediate hard material, ΔL2: Intermediate hard material Difference between the widthwise outer edge and the widthwise outer edge of the central hard material, R1: end region, R2: central region, R3: intermediate region, W1: width between widthwise outer edges of the end hard material, W2: central hard Material Width between outer edges of the material

Claims

A seismic isolation device, comprising a laminated structure in which a hard material and a soft material are alternately arranged in the vertical direction,
The laminated structure has two end regions respectively located on an upper side and a lower side, a central region located between the two end regions, and the central region between the central region and the end regions. And two intermediate regions located adjacent to the terminal region,
The hard material disposed in the end region is at least one end hard material,
The hard material disposed in the central region is at least one central hard material,
The hard material disposed in the intermediate region is at least one intermediate hard material,
The widthwise outer edge of the terminal hard material is located more widthwise outside than the widthwise outer edge of the central hard material, and the widthwise outer edge of the intermediate hard material is more than the widthwise outer edge of the central hard material. Also located in the width direction outside and in the width direction inner side than the width direction outer edge of the terminal hard material, further,
The ratio (W2 / W1) of the width W2 between the widthwise outer edges of the central hard material to the width W1 between the widthwise outer edges of the terminal hard material is:
A seismic isolation device in which 0.6 ≦ (W2 / W1) ≦ 0.97.
The said intermediate | middle hard material is arrange | positioned at the said intermediate | middle area | region, The width | variety of this intermediate | middle hard material becomes small as it goes to the said central area | region side from the said end area side, The exemption of Claim 1. Seismic device.
The seismic isolation device according to claim 1 or 2, wherein a plurality of the central hard materials are arranged in the central region, and the plurality of central hard materials have the same width.
The seismic isolation device according to any one of claims 1 to 3, wherein a plurality of terminal hard materials are arranged in the terminal region, and the plurality of terminal hard materials have the same width.
4. A plurality of terminal hard materials are arranged in the terminal region, and a width of the plurality of terminal hard materials increases from the central region side toward the terminal region side. The seismic isolation device according to item 1.
In the vertical cross-sectional view of the seismic isolation device, the terminal hard material adjacent to the intermediate hard material, the intermediate hard material, and the central hard material adjacent to the intermediate hard material, the widthwise outer edges of the end hard material, respectively. The seismic isolation device according to any one of claims 1 to 5, wherein the virtual ridge line has an acute angle A with respect to the vertical direction of 45 ° to 80 °.
The seismic isolation device according to claim 6, wherein the virtual ridge line is linear in a vertical cross-sectional view of the seismic isolation device.
8. The ratio (H3 / H0) of the vertical height H3 of the intermediate region with respect to the vertical height H0 of the laminated structure is 0.01 to 0.1. The seismic isolation device described in.
The seismic isolation device according to any one of claims 1 to 8, wherein an outer surface shape of the laminated structure is a combination of linear shapes in a vertical sectional view of the seismic isolation device.