JP7055985B2 - Construction method of seismic isolation structure and connection structure of seismic isolation structure - Google Patents

Description

The present invention relates to a method for constructing a seismic isolated structure and a connected structure for the seismic isolated structure.

Patent Document 1 discloses a technique relating to an extension method of a seismic isolated building and a new construction method of a seismic isolated building in which a seismic isolated building is constructed by dividing it into a plurality of construction periods. In this prior technology, adjacent seismic isolated buildings are constructed independently, and then the building foundations are connected by a connected building foundation, and an upper skeleton is constructed on the connected building foundations to construct a single seismic isolated building. are doing.

Patent Document 2 discloses a technique relating to a seismic isolated building in which a superstructure is supported via a seismic isolation device on the substructure. The prior art is characterized in that a plurality of superstructures are provided in close proximity to each other and the superstructures are connected to each other via dampers.

Patent Document 3 describes an extension method of a seismic isolated building for constructing a second seismic isolated building connected to the first seismic isolated building on the horizontal side of the first seismic isolated building after the completion of the first seismic isolated building. The technology related to is disclosed. In this prior art, the first seismic isolated building and the second seismic isolated building, which are seismically isolated and supported by using spherical sliding bearings, are connected.

Japanese Unexamined Patent Publication No. 10-292643 Japanese Unexamined Patent Publication No. 2001-193311 Japanese Unexamined Patent Publication No. 2018-9399

When constructing a seismically isolated second building adjacent to a seismically isolated first building, the lower parts may be connected and integrated before the construction of the second building is completed. be.

However, if the lower parts are rigidly connected before the construction of the second building is completed in this way, the earthquake response amount of the first building may increase during the period until the construction of the second building is completed.

On the other hand, as in Patent Document 1, when the lower parts are connected after the construction of the second building is completed, the earthquake response amount of the first building is measured in the period until the construction of the second building is completed. No increase will occur, but the relative horizontal movement between the first and second buildings will increase.

When the energy is absorbed by connecting with a damper as in Patent Document 2, it is necessary to connect the upper floors of the first building and the second building with a damper, which increases the cost.

In the case of seismic isolation support using a spherical sliding bearing as in Patent Document 3, the seismic isolation period is mainly determined by the radius of curvature. Therefore, even if the building is rigidly connected, it is possible to suppress an increase in the response amount during an earthquake in the high-rise part of the first seismic isolated structure until the construction of the second building is completed. However, the seismic isolation device is limited to spherical sliding bearings, and there is no freedom in selecting the seismic isolation device.

In view of the above facts, the present invention relates to the first seismic isolation structure at the time of an earthquake when the lower parts of the first seismic isolation structure and the second seismic isolation structure that are seismically isolated are connected and integrated. The purpose is to reduce the amount of horizontal movement relative to the second seismic isolation structure and to reduce the amount of response during an earthquake acting on the upper part of the first seismic isolation structure than when the lower parts are rigidly connected. ..

The first aspect is the process of constructing the second seismic isolation structure supported by seismic isolation next to the first seismic isolation structure constructed by seismic isolation support, and the construction of the second seismic isolation structure. By the construction method of the seismic isolation structure including the step of connecting the lower part of the first seismic isolation structure and the lower part of the second seismic isolation structure under construction with a rigid connecting member before completion. be.

In the construction method of the seismic isolation structure of the first aspect, the constructed first seismic isolation structure and the lower part of the second seismic isolation structure under construction are connected by a rigid connecting member. As a result, in the period until the construction of the second seismic isolation structure is completed, the relative horizontal movement amount between the first seismic isolation structure and the second seismic isolation structure at the time of an earthquake is compared with the case where both are not connected. (Amount of deformation of the connecting member) is reduced, and the amount of response during an earthquake acting on the upper part of the first seismic isolation structure is reduced as compared with the case where both are rigidly connected.

The lower part of the first seismic isolation structure and the second seismic isolation structure refers to a portion having a height of 1/3 or less of the structure.

The second aspect is the method for constructing a seismic isolation structure according to the first aspect , wherein the connecting member has a damping function.

In the construction method of the seismic isolation structure of the second aspect , the connecting member has a damping function. Therefore, during the period until the construction of the second seismic isolation structure is completed, while maintaining the effect of reducing the amount of response during an earthquake acting on the upper part of the first seismic isolation structure due to rigidity, the first seismic isolation structure and The relative horizontal movement amount (deformation amount of the connecting member) with the second seismic isolation structure can be further reduced. The connecting members having the rigidity and the damping function referred to here include those which can be regarded as having the equivalent rigidity and the equivalent damping function in the elasto-plastic behavior.

The third aspect includes a second seismic isolation structure that is seismically isolated and placed next to the first seismic isolation structure that is seismically isolated and has a different seismic isolation cycle from the first seismic isolation structure, and the first seismic isolation structure. It is a connecting structure of a seismic isolation structure provided with a rigid connecting member for connecting the lower part of the seismic isolation structure and the lower part of the second seismic isolation structure.

In the connecting structure of the seismic isolation structure of the third aspect, the lower parts of the first seismic isolation structure and the second seismic isolation structure having different seismic isolation cycles are connected by a rigid connecting member. As a result, the relative horizontal movement amount (deformation amount of the connecting member) between the first seismic isolation structure and the second seismic isolation structure at the time of an earthquake is reduced, and at the same time, it acts on the upper part of the first seismic isolation structure. The amount of response during an earthquake is reduced compared to the case where the lower parts are rigidly connected.

According to the present invention, when the lower parts of the first seismic isolation structure and the second seismic isolation structure that are seismically isolated are connected and integrated, the first seismic isolation structure and the second seismic isolation structure at the time of an earthquake are connected. The amount of horizontal movement relative to the seismic isolation structure can be reduced, and the amount of response during an earthquake acting on the upper part of the first seismic isolation structure can be reduced as compared with the case where the lower parts are rigidly connected to each other.

It is a process diagram which shows the process of constructing the 2nd seismic isolation structure and the 3rd seismic isolation structure adjacent to the 1st seismic isolation structure in order from (A) to (C). It is a process diagram which shows the process of the variation of FIG. 1 in order from (A) to (C). It is a model diagram of FIG. 1 (B). It is a graph which shows the relationship between the rigidity ratio of a connecting member, and the amount of deformation of a connecting member. It is a graph which shows the relationship between the rigidity ratio of a connecting member, and the shearing force acting on the first building. It is a graph which shows the relationship between the damping constant of a connecting member, and the deformation amount of a connecting member. It is a graph which shows the relationship between the damping constant of a connecting member, and the shearing force acting on the first building. It is a side view which shows the connection mechanism. It is a side view which shows the 1st variation of a connection mechanism. (A) is a perspective view showing a commercially available history damping material used for the connecting member, and (B) is a perspective view showing a variation of the connecting member. (A) is a side view showing a commercially available seismic isolation device, and (B) is a side view showing a connecting member of the connecting mechanism of FIG. It is a side view which shows the 2nd variation of a connection mechanism.

<Embodiment>
The construction method of the seismic isolation structure and the connecting structure of the seismic isolation structure according to the embodiment of the present invention will be described.

[Construction method and connection structure of seismic isolated structure]
As shown in FIG. 1 (C), the first seismic isolation structure 10 is composed of the first seismic isolation artificial ground 12 and the first building 14, and the second seismic isolation structure 20 is the second seismic isolation artificial ground. The third seismic isolation structure 30 is composed of a third seismic isolation artificial ground 32 and a green area 34.

The first seismic isolation artificial ground 12, the second seismic isolation artificial ground 22, and the third seismic isolation artificial ground 32 are provided in the seismic isolation pit 50 at lateral intervals, and are supported by the seismic isolation device 52, respectively. Has been done.

The area supporting the first seismic isolation structure 10 in the seismic isolation layer 60 provided with the seismic isolation device 52 of the seismic isolation pit 50 is designated as the first seismic isolation layer 61, and the second seismic isolation structure. The area supporting the seismic isolation of 20 is referred to as the second seismic isolation layer 62, and the area supporting the third seismic isolation structure 30 is referred to as the third seismic isolation layer 63.

The first seismic isolation artificial ground 12, the second seismic isolation artificial ground 22, and the third seismic isolation artificial ground 32 of the present embodiment are made of reinforced concrete, but are not limited thereto.

Then, the first building 14 is constructed on the first seismic isolated artificial ground 12, the second building 24 is constructed on the second seismic isolated artificial ground 22, and the green space 34 is constructed on the third seismic isolated artificial ground 32. Is constructed. In the present embodiment, the first building 14 and the second building 24 are skyscrapers of the same scale, but the present invention is not limited thereto.

In the present embodiment, the first seismic isolation artificial ground 12, the second seismic isolation artificial ground 22 and the third seismic isolation artificial ground 32 are connected by the connecting mechanism 100 and functionally integrated (integrated) and put into service. ing.

Further, as shown in FIGS. 1 (A) and 1 (B), the first building 14 was constructed in advance of the first seismic isolated artificial ground 12, and the second building is already in service. Start construction of 24.

In the present embodiment, as shown in FIG. 1 (B), the second building 24 connects the first seismic isolation artificial ground 12, the second seismic isolation artificial ground 22, and the third seismic isolation artificial ground 32 during construction. The first seismic isolation artificial ground 12, the second seismic isolation artificial ground 22, and the third seismic isolation artificial ground 32 have been put into service by being connected at 100 and functionally integrated. Reference numeral 24A in the figure indicates a lower layer portion of the second building 24 under construction.

Immediately after the construction of the first building 14 and the start of service, that is, before the construction of the second building 24 is started, the first seismic isolation artificial ground 12, the second seismic isolation artificial ground 22 and the third seismic isolation artificial ground are started. The ground 32 may be connected by the connecting mechanism 100.

Further, in the present embodiment, as shown in FIG. 1C, even if the first building 14, the second building 24, and the green space 34 are completed, the first seismic isolation artificial ground 12 and the second seismic isolation artificial ground 22 are used. The third seismic isolated artificial ground 32 is still connected by the connecting mechanism 100, but the present invention is not limited to this. The first seismic isolation artificial ground 12, the second seismic isolation artificial ground 22, and the third seismic isolation artificial ground 32 may be rigidly connected.

[Other examples]
Next, the second seismic isolation artificial ground 22 of the second seismic isolation structure 20 and the third seismic isolation artificial ground 32 of the third seismic isolation structure 30 are rigidly connected and integrated (integrated) for use. The case will be described. The same members are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIGS. 2 (A) and 2 (B), the first building 14 was constructed in advance of the first seismic isolated artificial ground 12, and the second building 24 is in a state of being in service. Start construction.

As shown in FIG. 2B, the second building 24 is functionally integrated by connecting the first seismic isolation artificial ground 12 and the second seismic isolation artificial ground 22 by the connecting mechanism 100 during construction, and the second seismic isolation. The seismic artificial ground 22 and the third seismic isolated artificial ground 32 are rigidly connected (integrated) and used as the artificial ground 41.

Immediately after the first building 14 is constructed and put into service, that is, before the construction of the second building 24 is started, the first seismic isolated artificial ground 12 and the second seismic isolated artificial ground 22 are connected by the connecting mechanism 100. It may be connected.

Further, in the present embodiment, as shown in FIG. 2C, even if the first building 14, the second building 24, and the green space 34 are completed, the first seismic isolation artificial ground 12 and the second seismic isolation artificial ground 22 are used. Is still connected by the connection mechanism 100, but is not limited thereto. The first seismic isolation artificial ground 12 and the second seismic isolation artificial ground 22 may be rigidly connected.

[Details of connection mechanism]
As shown in FIG. 8, the connecting mechanism 100 includes an expansion joint 110 and a connecting member 120 (see also FIG. 10A). Although FIG. 8 shows the connection portion between the first seismic isolation artificial ground 12 and the second seismic isolation artificial ground 22, the second seismic isolation artificial ground 22 and the third seismic isolation artificial ground 32 in FIG. 1 are shown. The connection site with and has the same structure.

The expansion joint 110 of the present embodiment shown in FIG. 8 is provided on the upper surface portions of the outer edge portions 12A and 22A of the first seismic isolation artificial ground 12 and the second seismic isolation artificial ground 22, and the outer edge portions 12A and the outer edge portions 22A, respectively. It has an expansion cover 112 made of a steel plate that overhangs so as to cover the gap (seismic clearance) 102 between the two. The expansion joint 110 in each figure is simplified and schematically shown. Further, the structure of the expansion joint 110 may be any.

Further, a first reinforcing convex portion 13 projecting downward is formed on the outer edge portion 12A of the first seismic isolated artificial ground 12, and a second projecting downward on the outer edge portion 22A of the second seismic isolated artificial ground 22. The reinforcing convex portion 23 is formed.

A horizontal U-shaped connecting member to the first reinforcing convex portion 13 of the outer edge portion 12A of the first seismic isolated artificial ground 12 and the second reinforcing convex portion 23 of the outer edge portion 22A of the second seismic isolated artificial ground 22. 120 is connected. In the connecting member 120, the base end portion 122A of the upper side 122 is bolted to the lower surface portion of the second reinforcing convex portion 23 of the second seismic isolation artificial ground 22, and the base end portion 124A of the lower side 124 is the first seismic isolation artificial ground. It is bolted to the lower surface of the first reinforcing convex portion 13 of the ground 12 via a plate-shaped fixing member 128.

As shown in FIG. 10A, the connecting member 120 of the present embodiment is made of a commercially available history damping material. The curved portion 123 between the upper side 122 and the lower side 124 of the connecting member 120 becomes narrower toward the top of the curved portion.

[Action and effect]
Next, the operation and effect of this embodiment will be described.

As shown in FIGS. 1 (A) and 2 (A), the first seismic isolation structure 10 has completed the construction of the first building 14 on the first seismic isolation artificial ground 12, and the second seismic isolation structure. In 20A, the second building 24 is under construction on the second seismic isolated artificial ground 22, and only the lower part 24A is completed. Therefore, the seismic isolation cycle differs between the first seismic isolation structure 10 and the second seismic isolation structure 20A.

Then, as shown in FIGS. 1B and 2B, the first seismic isolation artificial ground 12 is in a state where the first seismic isolation structure 10 and the second seismic isolation structure 20A have different seismic isolation cycles. And the second seismic isolated artificial ground 22 are connected by a connecting mechanism 100 and functionally integrated (integrated) for use. In the case of FIG. 1B, the second seismic isolation artificial ground 22 and the third seismic isolation artificial ground 32 are connected by the connecting mechanism 100 and functionally integrated (integrated) for use. In the case of FIG. 2B, the second seismic isolated artificial ground 22 and the third seismic isolated artificial ground 32 are rigidly connected and integrated (comprehensive) and used as the artificial ground 41.

The connecting member 120 of the connecting mechanism 100 is made of a commercially available history damping material. Therefore, as described above, the first seismic isolation structure 10 in which the construction of the first building 14 is completed and the second seismic isolation structure 20A in which only the lower portion 24A of the second building 24 is completed are seismically isolated. Although the period is different, by connecting with the connecting member 120 having rigidity, the relative horizontal movement amount of the first seismic isolated artificial ground 12 and the second seismic isolated artificial ground 22 at the time of an earthquake is larger than the case where both are not connected. The amount of response during an earthquake acting on the first building 14 is also reduced as compared with the case where the first seismic isolated artificial ground 12 and the second seismic isolated artificial ground 22 are rigidly connected.

Further, since the connecting member 120 has a damping function, the first seismic isolation artificial ground 12 and the second seismic isolation artificial ground 22 are maintained while maintaining the effect of reducing the earthquake response amount acting on the first building 14. The amount of horizontal movement relative to and can be further reduced.

Therefore, the relative horizontal movement amount of the first seismic isolation artificial ground 12 and the second seismic isolation artificial ground 22 can be made smaller than when the first seismic isolation artificial ground 12 and the second seismic isolation artificial ground 22 are not connected. The gap 102 with the seismic isolated artificial ground 22 can be narrowed. Therefore, the cost of the expansion joint 110 constituting the connecting mechanism 100 can be reduced.

The details of the relative horizontal movement amount between the first seismic isolation artificial ground 12 and the second seismic isolation artificial ground 22 at the time of an earthquake, that is, the reduction of the deformation amount of the connecting member 120 and the reduction of the response amount at the time of an earthquake will be described later. do.

Further, the rigidity of the connecting member 120 and the size of the damping function can be adjusted by the number of connecting members 120 to be installed. Further, when it is desired to obtain the effect only in the left-right direction of FIG. 8, the width may be widened in the direction orthogonal to the paper surface of FIG. 8 as in the connecting member 119 of FIG. 10 (B).

Since the connecting member 120 of FIG. 10A is commercially available as a history damping material (seismic isolation member), it can be easily obtained at low cost. Further, even when the wide connecting member 119 of FIG. 10B is used, it is sufficient to manufacture the commercially available product with a wide width, so that low cost can be enjoyed.

[Details of action and effect]
Next, regarding the relative horizontal movement amount between the first seismic isolation artificial ground 12 and the second seismic isolation artificial ground 22 at the time of the above-mentioned earthquake, that is, the reduction of the deformation amount of the connecting member 120 and the reduction of the response amount at the time of the earthquake. The details will be explained.

FIG. 3 shows the state of FIG. 1 (B) of the present embodiment, that is, the first seismic isolation artificial ground 12 and the second building 24 of the first seismic isolation structure 10 in the state where the construction of the first building 14 is completed. The second seismic isolation artificial ground 22 of the second seismic isolation structure 20A in the state where only the lower part 24A is completed during construction, and the third seismic isolation structure 30 of the third seismic isolation structure 30 in the state where the green space 34 is not constructed. It is a model diagram for performing the seismic isolation analysis in the state where the artificial ground 32 and the artificial ground 32 are connected by the connecting member 120 (see also FIG. 8 and FIG. 10A), respectively. At the same time, by making the connecting mechanism 100 between the second seismic isolation artificial ground 22 and the third seismic isolation artificial ground 32 rigidly connected (assuming that it has a sufficiently large rigidity value numerically). It is also a model diagram for performing seismic response analysis in the state of FIG. 2 (B).

Here, the relative scales of the first seismic isolation structure 10, the second seismic isolation structure 20 (the state where the second building 24 is completed), and the third seismic isolation structure 30 are almost the same. This is referred to as the relative scale of the first seismic isolation structure 10 being 1.0 times.

The rigidity of the connecting member 120 of the connecting mechanism 100 between the first seismic isolated artificial ground 12 and the second seismic isolated artificial ground 22 is 0.002 to 2000 at a ratio where the rigidity of the first seismic isolated layer 61 is 1. It was set to 10 levels. The rigidity of the connecting member 120 between the second seismic isolation artificial ground 22 and the third seismic isolation artificial ground 32 is the first seismic isolation artificial ground 12 and the second seismic isolation when the state shown in FIG. 1 (B) is targeted. The value was set to the same value as the rigidity of the connecting member 120 between the seismic artificial ground 22 and 2000 times the rigidity of the first seismic isolation layer 61 when the state shown in FIG. 2B was targeted. Of these rigidity values, a state in which 0.002 times the rigidity of the first seismic isolation layer 61 is not connected is simulated, and a state in which 2000 times the rigidity of the first seismic isolation layer 61 is rigidly connected is simulated. Treated as a thing. Further, here, the connecting member 120 has only rigidity and does not have a damping function.

The input direction of the seismic wave is the arrow N direction in the model diagram of the seismic response analysis of FIG. The types of seismic waves to be input are the notification wave Kobe phase, the Kushiro phase, the Hachinohe phase, and the long-period ground motion pub rice wave OS2, all of which take into consideration the surface ground amplification of the assumed site. The analysis conditions are 80 conditions that combine two levels of connection states (FIGS. 1 (B) and 2 (B)), 10 levels of rigidity of the connection mechanism 100, and four types of seismic waves to be input.

The evaluation indexes were the amount of deformation of the connecting member 120 and the amount of response during an earthquake of the first building 14 of the first seismic isolation structure 10.

FIG. 4 is a graph showing the relationship between the spring rigidity of the connecting member 120 and the maximum deformation amount of the connecting member 120 in the seismic response analysis result. FIG. 5 is a graph showing the relationship between the spring rigidity of the connecting member 120 in the seismic response analysis result and the shearing force as an example of the seismic response amount of the first building 14.

In both graphs of FIGS. 4 and 5, the “rigidity ratio” on the horizontal axis is the connecting member 120 with respect to the horizontal rigidity of the first seismic isolation layer 61 (see FIGS. 1 and 3) of the first seismic isolation structure 10. It is the ratio of spring rigidity and is expressed on the logarithmic axis. Further, in both graphs of FIGS. 4 and 5, the vertical axis is based on the average value of the results calculated assuming that there is no connection (rigidity of the first seismic isolation layer 61 × 0.002), and each calculation result is used as the reference value. It is shown by the value (ratio) divided. In both the graphs of FIGS. 4 and 5, the x mark is the calculation result of the above 80 conditions, and the thick line is the line connecting the averaged results for each spring rigidity (rigidity ratio) of the connecting member 120.

From the graph of FIG. 4, it can be seen that the amount of deformation of the connecting member 120 decreases as the spring rigidity of the connecting member 120 increases. Further, from the graph of FIG. 5, it can be seen that the shearing force acting on the first building 14 increases as the spring rigidity of the connecting member 120 increases. That is, both the amount of deformation of the connecting member 120 and the shearing force acting on the first building 14 have a trade-off relationship with the spring rigidity of the connecting member 120.

Further, when the rigidity ratio of the spring rigidity of the connecting member 120 is 0.2 times or more, it can be regarded as a substantially non-connected state, and when the rigidity ratio of the spring rigidity of the connecting member 120 is 200 times or more, it can be regarded as a substantially rigid connection state. I understand. Then, it can be seen that when the rigidity ratio takes a value between 0.2 times and 200 times, the amount of deformation of the connecting member 120 and the magnitude of the shearing force acting on the first building 14 largely change. .. In particular, the change in the graph is large while the value of the spring rigidity ratio of the connecting member 120 is 1 to 20. Therefore, by appropriately selecting the rigidity ratio between 1 and more and 20 or less, the amount of deformation of the connecting member 120 which fluctuates in a trade-off and the shearing force acting on the first building 14 can be a combination of desired values. Can be.

For example, by doubling the rigidity ratio of the spring rigidity of the connecting member 120, the amplification of the shear force is limited to about 1.06 times that of the non-connected member, and the deformation amount of the connecting member 120 is the relative deformation amount of the non-connected member. It can be 0.75 times that of.

That is, the equivalent rigidity of the connecting member 120 is 1 or more and 20 or less in ratio to the horizontal equivalent rigidity of the seismic isolation device 52 (first seismic isolation layer 61) that supports the first seismic isolation structure 10. It is preferable to set the value in the range.

The equivalent rigidity referred to here is the maximum amount of deformation in a predetermined seismic motion (for example, level 2) (deformation that occurs in the connecting member 120 in the former, and deformation of the seismic isolation device 52 in the latter (first seismic isolation artificial). The ratio of the force generated at that time to the amount of deformation (split line rigidity) is taken on the assumption of the amount of movement of the ground 12)). The calculation of the equivalent stiffness in this way is an example and is not limited to this.

Further, although the illustration and the calculation example are not shown, it has been confirmed that substantially the same result is obtained when the relative scale of the first seismic isolation structure 10 is set to 0.5 times and 2 times.

Next, the analysis was performed under the condition that the connecting member 120 was provided with the damping function. The rigidity ratio of the connecting member 120 between the first seismic isolated artificial ground 12 and the second seismic isolated artificial ground 22 was set to three levels of 2 to 10. The rigidity ratio of the connecting member 120 between the second seismic isolation artificial ground 22 and the third seismic isolation artificial ground 32 is the first seismic isolation artificial ground 12 and the second seismic isolation when the state shown in FIG. 1 (B) is taken into consideration. The value is the same as the rigidity of the connecting member 120 between the seismic artificial ground 22 and 2000 times the rigidity of the first seismic isolation layer 61 (a value simulating the rigid connection state) when the state shown in FIG. 2B is targeted. ). The damping constant of the connecting member 120 was set to three levels of 0 to 0.6. The input direction of the seismic wave and the type of the seismic wave to be input are the same as in the above analysis. The analysis conditions are 2 × 3 × 3 × 4 = 72 conditions. Similarly, the evaluation index was the amount of deformation of the connecting member 120 and the amount of response during an earthquake of the first building 14 of the first seismic isolation structure 10.

FIG. 6 is a graph showing changes in the amount of deformation of the connecting member 120 during an earthquake with respect to the damping constant of the connecting member 120. FIG. 7 is a graph showing changes in the seismic response amount (shear force) of the first building 14 with respect to the damping constant of the connecting member 120.

In both graphs of FIGS. 6 and 7, the horizontal axis is the damping constant of the connecting member 120. Further, in both the graphs of FIGS. 6 and 7, the vertical axis shows the average value of the results calculated with the attenuation constant as 0 as the reference value, and the value (ratio) obtained by dividing each calculation result by the reference value. In both the graphs of FIGS. 6 and 7, the x mark is the calculation result of the above 72 conditions, and the thick line is the line connecting the averaged results for each damping constant of the connecting member 120.

As shown in FIG. 6, it can be seen that the amount of deformation of the connecting member 120 can be suppressed by giving the connecting member 120 a damping function. When the attenuation constant is 0.3, the average value is found to be about 0.7 times that when the attenuation constant is 0 (when the attenuation function is not provided), and when the attenuation constant is 0.6, it is about 0.7 times. It turns out that it will be 0.55 times.

When the connecting mechanism 100 is to be composed of a single member such as the connecting member 120, it is difficult to have the required equivalent rigidity and the damping constant to exceed 0.6. Therefore, it is considered that the degree of suppressing the amount of deformation of the connecting member 120 by using such a configuration is limited to about 0.55 times as an average value.

On the other hand, as shown in FIG. 7, it can be seen that the change in the shearing force acting on the first building 14 is insensitive to the damping constant of the connecting member 120. This is because, in both the case where the attenuation constant is 0.3 and the case where the attenuation constant is 0.6, it is about 0.98 times the case where the attenuation is 0. That is, it can be seen that by giving the connecting member 120 a damping function, the amount of deformation of the connecting member 120 can be reduced with almost no change in the earthquake response amount (shearing force in this example) of the first building 14. ..

Here, in the present embodiment, it is an object to suppress the amplification of the earthquake response amount of the first building 14 as much as possible and to minimize the deformation amount generated in the connecting member 120. Therefore, a suitable result can be obtained by giving the connecting member 120 a damping function.

For example, when the damping constant is 0 when the damping constant is 0 when the lower limit of the selection range of the rigidity ratio value of the spring rigidity of the connecting member 120 described above is 1, the deformation amount (average value) generated in the connecting member 120 is not connected. It will be about 0.85 times the time. Further, when the damping constant 0.6 is given to the connecting member 120, the deformation amount (average value) of the connecting member 120 is 0.85 × 0.55 = 0.47 times the unconnected member, that is, the unconnected member 120. It will be about 0.5 times.

Therefore, by applying the present invention, the amount of deformation generated in the connecting member 120 can be reduced to about 0.5 times that in the non-connected state. That is, when the present invention is not applied to the gap (seismic clearance) 102 (see FIGS. 1, 3 and 8) that absorbs the relative displacement between the first seismic isolated artificial ground 12 and the second seismic isolated artificial ground 22. It can be reduced to about 1/2 or less.

<Variations>
Next, variations of the connecting mechanism of the above embodiment will be described.

(First variation)
FIG. 9 illustrates the first variation of the coupling mechanism 200.

The connecting mechanism 200 has an expansion joint 110 and a connecting member 220 (see also FIG. 11B).

A first reinforcing convex portion 15 projecting downward is formed on the outer edge portion 12A of the first seismic isolated artificial ground 12, and a second reinforcing convex portion projecting downward on the outer edge portion 22A of the second seismic isolated artificial ground 22. The portion 25 is formed.

The connecting member 220 of the present embodiment is made of laminated rubber containing a lead plug, which has rigidity in the horizontal direction and has a damping function.

As shown in FIGS. 9 and 11B, in the connecting member 220 of this variation, a rubber 224 and a steel plate 226 are laminated between the upper and lower flanges 222, and a lead plug (not shown) is inserted inside. It is a structure.

As shown in FIG. 9, the upper flange 222 of the connecting member 220 is bolted to the lower surface of the second reinforcing convex portion 25 of the outer edge portion 22A of the second seismic isolated artificial ground 22. Further, the lower flange 222 of the connecting member 220 is joined to the lower surface portion of the first reinforcing convex portion 15 of the outer edge portion 12A of the first seismic isolation artificial ground 12 via the fixing plate 228.

As shown in FIG. 11B, the rigidity and the magnitude of the damping function of the connecting member 220 can be adjusted by the laminated thickness of the rubber 224 and the steel plate 226 and the size of the lead plug (not shown). ..

Further, by changing the specifications of the laminated rubber 221 containing a lead plug, which is commercially available as the seismic isolation device shown in FIG. 11 (A), the laminated thickness of the rubber 224 and the steel plate 226 and the size of the lead plug (not shown). The connecting member 220 of this variation can be easily obtained at low cost.

Further, as the lead plug-containing laminated rubber 221 commercially available as the seismic isolation device shown in FIG. 11A, a material whose required values for breaking elongation, yield ratio, variation of yield point and the like are strictly controlled is used. On the other hand, the amount of deformation required for the connecting member 220 having the same structure shown in FIG. 11B is small. Therefore, for the connecting member 220 having the same structure shown in FIG. 11 (B), it is possible to use a material whose required value is relaxed as compared with the lead plug-containing laminated rubber 221 commercially available as the seismic isolation device shown in FIG. 11 (A). Since it can be done, the cost is low in this respect as well.

Laminated rubber other than the lead plug-containing laminated rubber 221 may be used, for example, a high-damping laminated rubber, a tin-plugged laminated rubber, or a natural rubber-based laminated rubber.

(Second variation)
FIG. 12 illustrates the second variation of the coupling mechanism 300.

The connecting mechanism 300 has an expansion joint 110 and a connecting member 320.

A first reinforcing convex portion 17 projecting downward is formed on the outer edge portion 12A of the first seismic isolated artificial ground 12, and a second reinforcing convex portion projecting downward on the outer edge portion 22A of the second seismic isolated artificial ground 22. The portion 27 is formed.

The connecting member 320 of this variation is composed of a pair of curved members 322 and a linear member 324. One end of the pair of curved members 322 is curved upward in a side view, and is bolted to the first reinforcing convex portion 17 of the first seismic isolated artificial ground 12 and the second reinforcing convex portion 27 of the second seismic isolated artificial ground 22. ing. The horizontal portion on the other end side of the pair of curved members 322 is connected to the straight member 324 by bolting.

The length, curvature and cross-sectional performance of the curved member 322 of the connecting member 320, the length of the linear member 324, and the cross-sectional performance are the same as those of the connecting member 120 (see FIG. 8A), and the connecting member 120 or the connecting member 120 or the connecting member 120. The relationship between the deformation generated in the member 320 and the strain generated in each part of the connecting member 120 and the connecting member 320 is configured to be the same. That is, the connecting member 320 is a member having the same mechanical performance as the connecting member 120.

The connecting member 320 of this variation has a specification of attachment to the outer edge portion 12A of the first seismic isolated artificial ground 12 and the outer edge portion 22A of the second seismic isolated artificial ground 22 as compared with the connecting member 120 (see FIG. 10 (A)). It will be convenient. Further, as in the connecting member 119 (see FIG. 10B) with respect to the connecting member 120 (see FIG. 10A), the connecting member 320 is widened in the direction orthogonal to the drawing, and is effective only for deformation in one direction. It may be installed so as to be. Further, the shape of the connecting member 320 is not limited to the shape shown in FIG. 12 as long as the relationship between the deformation and the strain of each part is the same as that of the connecting member 120 and has the same mechanical properties.

<Others>
The present invention is not limited to the above embodiment.

For example, in the above embodiment, the first seismic isolation structure 10 that is seismically isolated is composed of the first seismic isolation artificial ground 12 and the first building 14, and the second seismic isolation structure 20 that is seismically isolated is The second seismic isolation artificial ground 22 and the second building 24 are composed, and the first seismic isolation artificial ground 12 and the second seismic isolation artificial ground 22 are connecting members 119, 120, 220 having rigidity and a damping function. , 320, but is not limited to this.

For example, the lower part of the first seismic isolated building of the foundation seismic isolation structure and the lower part of the second seismic isolated building of the foundation seismic isolation structure are connected by connecting members 119, 120, 220, 320 having rigidity and damping function. You may. The "lower part" here refers to the lower 1/3 of the seismic isolated building.

Further, the connecting members 119, 120, 220 and 320 have rigidity and a damping function, but are not limited thereto. It may be a connecting member having only rigidity.

Further, it may be a connecting member having a structure in which an elastic member such as a coil spring and a damping member such as an oil damper are arranged in parallel.

Further, it can be carried out in various embodiments without departing from the gist of the present invention.

10 First seismic isolation structure 12 First seismic isolation artificial ground (an example of the lower part)
20 Second seismic isolation structure 22 Second seismic isolation artificial ground (an example of the lower part)
120 Connecting member 220 Connecting member 320 Connecting member

Claims (9)

Next to the first seismic isolation structure constructed with seismic isolation support, the process of constructing the second seismic isolation structure with seismic isolation support,
Before the construction of the second seismic isolation structure is completed, the first seismic isolation structure and the lower part of the second seismic isolation structure under construction are connected to each other without being rigidly connected by a rigid connecting member. And the process to do
Construction method of seismic isolation structure equipped with. The connecting member has a damping function.
The method for constructing a seismic isolated structure according to claim 1. The first seismic isolation structure and the lower portions of the second seismic isolation structure under construction are connected by the connecting member and the expansion joint.
The method for constructing a seismic isolated structure according to claim 1 or 2. The first seismic isolation structure is composed of a first seismic isolated artificial ground supported by seismic isolation and a first building constructed on the first seismic isolated artificial ground.
The second seismic isolation structure is composed of a second seismic isolated artificial ground supported by seismic isolation and a second building constructed on the second seismic isolated artificial ground.
Before the construction of the second building is completed, the first seismic isolated artificial ground and the second seismic isolated artificial ground are connected by the connecting member.
The method for constructing a seismic isolated structure according to any one of claims 1 to 3. A second seismic isolation structure that is placed next to the first seismic isolation structure that is seismically isolated and has a different seismic isolation cycle from the first seismic isolation structure.
A connecting member having rigidity that connects the first seismic isolation structure and the lower part of the second seismic isolation structure without rigidly connecting them.
Connected structure of seismic isolation structure with. The first seismic isolation structure and the lower part of the second seismic isolation structure under construction are connected by the connecting member and the expansion joint.
The connected structure of the seismic isolation structure according to claim 5. The first seismic isolation structure is composed of a first seismic isolated artificial ground supported by seismic isolation and a first building constructed on the first seismic isolated artificial ground.
The second seismic isolation structure is composed of a second seismic isolated artificial ground supported by seismic isolation and a second building constructed on the second seismic isolated artificial ground.
The connecting member connects the first seismic isolated artificial ground and the second seismic isolated artificial ground.
The connected structure of the seismic isolation structure according to claim 5 or 6. Next to the first seismic isolation structure constructed with seismic isolation support, the process of constructing the second seismic isolation structure with seismic isolation support,
Before the construction of the second seismic isolation structure is completed, the first seismic isolation structure and the lower part of the second seismic isolation structure under construction are connected to each other by a rigid connecting member having a damping function. Process and
Construction method of seismic isolation structure equipped with. A second seismic isolation structure that is seismically isolated and placed next to the first seismic isolation structure and has a different seismic isolation cycle from the first seismic isolation structure.
A rigid connecting member having a damping function for connecting the lower part of the first seismic isolation structure and the second seismic isolation structure to each other.
Connected structure of seismic isolation structure with.

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