Building connection structure and building connection method

Abstract

To provide a building connection structure reducing shear force acting on both of two base-isolated buildings as reducing displacement therebetween.SOLUTION: Two base-isolated buildings 10, 20 are connected with a viscous damper 30 for a building connection structure.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a building connection structure and a building connection method.

Background Art

[0002] The following Patent Document 1 describes a method for expanding a seismic isolation building in which a preceding building seismically supported by a seismic isolation device and an extended building seismically supported by a seismic isolation device are connected by a vibration damping member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The vibration damping member of Patent Document 1 functions as a damper. As such a vibration damping member functioning as a damper, an elastic member may be used. Further, examples of the damper using an elastic member include a steel damper, a friction damper, and a lead damper. And, there are cases where such two buildings are connected by an elastic member such as a framework constituted by a steel frame or the like, a spring member such as a coil spring and a disc spring.

[0005] However, when two seismic isolation buildings are connected by an elastic member, the shear force input to either one of the seismic isolation buildings is likely to be amplified. When the input shear force is amplified, it is necessary to reinforce the structure of the building in order to resist the shear force.

[0006] In consideration of the above facts, an object of the present invention is to provide a building connection structure and a building connection method that are likely to reduce the shear forces input to both while reducing the inter-story displacement between two seismic isolation buildings.

Means for Solving the Problems

[0007] The building connection structure of claim 1 is such that two seismically isolated buildings are connected by viscous dampers. The two aforementioned seismically isolated buildings were completed at different times. The natural period of the later-completed base-isolated building is longer than the natural period of the earlier-completed base-isolated building. .

[0008] In the building connection structure of claim 1, two base-isolated buildings are connected by a viscous damper. This allows energy to be absorbed in response to the relative displacement or velocity of the two base-isolated buildings, making it easier to reduce the inter-building displacement of the two base-isolated buildings compared to the case where the two base-isolated buildings are not connected.

[0009] Furthermore, compared to a case where two base-isolated buildings are connected by elastic members, it is easier to reduce the shear force applied to both base-isolated buildings. This allows for a less stringent reinforcement structure for the two base-isolated buildings.

[0010] One aspect The building connection structure is as described in claim 1, wherein the two base-isolated buildings each have different natural periods.

[0011] One aspect In this building-connected structure, the two base-isolated buildings have different natural periods. That is, the natural period of one base-isolated building is longer than that of the other base-isolated building. As a result, the shear force applied to one of the base-isolated buildings is easily reduced.

[0012] Claim 2 The building connection structure is, Claim 1 In the building connection structure described above, the two base-isolated buildings each have different damping constants.

[0013] Claim 2 In this building connection structure, the damping constants of the two base-isolated buildings are different. That is, the damping constant of one base-isolated building is greater than that of the other base-isolated building. This makes it easier to reduce the inter-building displacement between the two base-isolated buildings. It also makes it easier to reduce the shear force input to the other base-isolated building. The building connection structure of claim 3 is the building connection structure of claim 2, wherein the damping constant of the later-completed base-isolated building is greater than the damping constant of the earlier-completed base-isolated building.

[0014] The building connection structure according to claim 4 is the building connection structure according to any one of claims 1 to 3, wherein the viscous dampers for connecting the two seismic isolation buildings are provided only on one floor, and the viscous dampers are connected to the floor directly above the seismic isolation layer or the ground floor of at least one of the seismic isolation buildings.

[0015] In the building connection structure according to claim 4, the viscous dampers are provided only on one floor. As a result, construction is easier compared to the case of providing them on multiple floors.

[0016] Further, the viscous dampers are connected to the ground floor closest to the seismic isolation layer of at least one of the seismic isolation buildings. As a result, it is easier to reduce the inter - building displacement that occurs in the seismic isolation layer compared to the case of being connected to a location far from the seismic isolation layer. Consequently, the inter - building displacement can also be suppressed in the superstructure above the seismic isolation layer.

[0017] One embodiment of a building connection structure is: The two seismic isolation buildings have different completion times, and the natural period of the later - completed seismic isolation building is longer than the natural period of the earlier - completed seismic isolation building.

[0018] One aspect In the building connection structure, the natural period of the later - completed seismic isolation building is longer than the natural period of the earlier - completed seismic isolation building. As a result, the shear force input to the later - completed seismic isolation building is likely to be reduced.

[0019] One embodiment of a building connection structure is: The two seismic isolation buildings have different completion times, the natural period of the later - completed seismic isolation building is longer than the natural period of the earlier - completed seismic isolation building, and the damping constant of the later - completed seismic isolation building is larger than the damping constant of the earlier - completed seismic isolation building.

[0020] One aspect In the building connection structure, the natural period of the later - completed seismic isolation building is longer than the natural period of the earlier - completed seismic isolation building. As a result, the shear force input to the later - completed seismic isolation building is likely to be reduced.

[0021] In addition, in this building connection structure, the damping constant of the later-completed seismic isolation building is larger than that of the earlier-completed seismic isolation building. As a result, it is easier to reduce the inter-building displacement between the two seismic isolation buildings. Also, the shear force input to the earlier-completed seismic isolation building is likely to be reduced.

[0022] Claim 5 The building connection method includes a step of constructing a first seismic isolation building, and a step of calculating the inter-building displacement between the first seismic isolation building and the second seismic isolation building, the shear force input to the first seismic isolation building, and the shear force input to the second seismic isolation building according to a coefficient (β) indicating the total amount of viscous dampers connecting the first seismic isolation building and the second seismic isolation building, with the natural period (T2) and damping constant (h2) of the second seismic isolation building constructed close to the first seismic isolation building as variables. Further, there is a step of determining the natural period (T2), the damping constant (h2), and the coefficient (β) of the second seismic isolation building to reduce the inter-building displacement and reduce both the shear force input to the first seismic isolation building and the shear force input to the second seismic isolation building as compared with the case where the first seismic isolation building and the second seismic isolation building are not connected.

[0023] Claim 5 In the building connection method, the first seismic isolation building and the second seismic isolation building are connected by viscous dampers. As a result, it is easier to reduce the inter-building displacement between the two seismic isolation buildings as compared with the case where the first seismic isolation building and the second seismic isolation building are not connected. Also, it is easier to reduce the shear force input to both the first seismic isolation building and the second seismic isolation building.

[0024] Also, in this building connection method, when connecting the first seismic isolation building and the second seismic isolation building with viscous dampers, the natural period (T2), the damping constant (h2), and the coefficient (β) indicating the total amount of viscous dampers of the second seismic isolation building are determined to reduce the inter-building displacement between the two buildings and reduce both the shear forces input to the two seismic isolation buildings. As a result, it is possible to more reliably reduce the inter-building displacement between the two seismic isolation buildings and reduce both the shear forces input to the two seismic isolation buildings.

Advantages of the Invention

[0025] According to the present invention, it is easier to reduce the shear force applied to both of the two base-isolated buildings. [Brief explanation of the drawing]

[0026] [Figure 1] (A) is an elevation view showing a building connection structure according to an embodiment of the present invention; (B) is an elevation view showing a modified example in which one of the base-isolated buildings has a basement floor; (C) is an elevation view showing a modified example in which both base-isolated buildings have basement floors; (D) is an elevation view showing another modified example in which both base-isolated buildings have basement floors; (E) is an elevation view showing a modified example in which a retaining wall is located between the base-isolated buildings; and (F) is an elevation view showing another modified example in which a retaining wall is located between the base-isolated buildings. [Figure 2] (A) is a graph showing the dimensionless inter-building displacement between base-isolated buildings and the shear force multiplier input to the base-isolated buildings as a function of the coefficient β, which represents the total amount of viscous dampers; (B) is a graph showing the case when the parameters are changed; and (C) is a graph showing the case when the parameters are changed in a different manner. [Figure 3] This is a comparative example graph showing the dimensionless inter-building displacement between base-isolated buildings and the shear force multiplier applied to the base-isolated buildings as a function of a coefficient α representing the total amount of elastic members. [Figure 4] (A) is a graph showing the dimensionless inter-building displacement between base-isolated buildings and the shear force multiplier input to the base-isolated buildings as a function of the coefficient β, which represents the total amount of viscous dampers. (B) is a graph showing the case when the natural period of the base-isolated buildings is changed. [Modes for carrying out the invention]

[0027] Hereinafter, a building connection structure and building connection method according to embodiments of the present invention will be described with reference to the drawings. Components indicated by the same reference numerals in each drawing are considered to be the same component. However, unless otherwise specified in the specification, each component is not limited to one, and there may be multiple such components.

[0028] Furthermore, explanations of redundant components and reference numerals in each drawing may be omitted. This disclosure is not limited to the following embodiments, and modifications can be made as appropriate within the scope of the purpose of this disclosure, such as omitting components, substituting them with different components, or combining one embodiment with various modifications.

[0029] <Building interconnected structure> As shown in Figure 1(A), the building connection structure according to an embodiment of the present invention is formed by connecting two seismic isolation buildings 10 and 20 with a viscous damper 30.

[0030] The base-isolated building 10 is a so-called base-isolated structure, supported by a foundation slab 14 via a base isolation device 12. Similarly, the base-isolated building 20 is a so-called base-isolated structure, supported by a foundation slab 24 via a base isolation device 22. The foundation slabs 14 and 24 may be integrated or separate.

[0031] Seismic isolation buildings 10 and 20 were completed at different times; seismic isolation building 10 was completed first, and seismic isolation building 20 was completed later. Seismic isolation building 20 was constructed with a gap between it and seismic isolation building 10.

[0032] A viscous damper 30 is positioned between the base-isolated building 10 and the base-isolated building 20. The base-isolated building 10 and the base-isolated building 20 are connected by this viscous damper 30. The viscous damper 30 is composed of, for example, an oil damper, a viscous body damper, a viscoelastic body damper, etc.

[0033] The viscous damper 30 is installed on only one floor and connects the "floors directly above" the respective seismic isolation layers (the layers on which the seismic isolation devices 12 and 22 are located) in the seismically isolated buildings 10 and 20.

[0034] In the example shown in Figure 1(A), the height positions of the seismic isolation layers in seismically isolated buildings 10 and 20 are the same. However, as shown in Figure 1(B), the height positions of the seismic isolation layers in seismically isolated buildings 10 and 20 may be different.

[0035] In the example shown in this figure, the base-isolated building 20 has a basement, and the base isolation layer of the base-isolated building 20 is formed at a lower position than the base isolation layer of the base-isolated building 10. In such a case, the viscous damper 30 connects the "floor directly above" the base isolation layer in the base-isolated building 10 with the "closest ground floor" to the base isolation layer in the base-isolated building 20.

[0036] Furthermore, as shown in Figures 1(C) and (D), the base-isolated buildings 10 and 20 may each have basement floors. For example, in the example shown in Figure 1(C), the viscous damper 30 connects the "floors directly above" the base isolation layers in both base-isolated buildings 10 and 20 in the basement. In the example shown in Figure 1(D), the viscous damper 30 connects the "floor directly above" the base isolation layer in base-isolated building 20 to a floor in base-isolated building 10 at a height corresponding to that "floor directly above".

[0037] Furthermore, in the examples shown in Figures 1(E) and (F), a retaining wall 40 is provided between the base-isolated buildings 10 and 20, which have basement floors. In these examples, the viscous damper 30 connects the respective above-ground floors of the base-isolated buildings 10 and 20. Thus, due to the retaining wall 40 or other obstacles, it may not be possible to connect the viscous damper 30 to the floor directly above either of the base isolation layers of the base-isolated buildings 10 and 20. In such cases, the viscous damper 30 may be connected to the above-ground floor closest to the base isolation layer of the base-isolated buildings 10 and 20.

[0038] In other words, in the present invention, the viscous damper 30 only needs to be connected to the floor directly above the seismic isolation layer or to the ground floor of at least one of the seismically isolated buildings (seismic isolation building 10 or 20).

[0039] These two base-isolated buildings, 10 and 20, have different natural periods and damping constants. Specifically, the natural period T2 of the later-completed base-isolated building 20 is longer than the natural period T1 of the earlier-completed base-isolated building 10, being approximately 1.1 times or more. Also, the damping constant h2 of the later-completed base-isolated building 20 is greater than the damping constant h1 of the earlier-completed base-isolated building 10. For example, the damping constant h2 is approximately 1.1 times or more than the damping constant h1.

[0040] <Building connection method> The building connection method according to an embodiment of the present invention comprises the following steps. Note that the numerical values ​​used in the following description are hypothetical values ​​used for the sake of simplicity, and specific numerical values ​​will be used in actual building connection methods. Also, the graphs shown in each figure are schematic.

[0041] (Process 1) First, we will construct seismically isolated building 10, which will serve as the first seismically isolated building.

[0042] (Process 2) Next, using the natural period T2 and damping constant h2 of the base-isolated building 10 and the second base-isolated building 20 to be constructed adjacent to the base-isolated building 10 as variables, the inter-building displacement between the base-isolated building 10 and the base-isolated building 20, the shear force input to the base-isolated building 10, and the shear force input to the base-isolated building 20 are calculated according to the coefficient β which represents the total amount of viscous dampers 30 connecting the base-isolated building 10 and the base-isolated building 20.

[0043] Let me explain step 2 in more detail.

[0044] Since the base-isolated building 10 has already been constructed, its weight, natural period T1, damping coefficient C1, and damping constant h1 are known values.

[0045] Therefore, a frequency response analysis is performed on a two-building connected two-mass model (a model in which two buildings, seismic isolation building 10 and seismic isolation building 20, are each treated as one mass, and the masses are connected to each other), and the relationship shown in the schematic graphs in Figures 2(A) to (C) is derived.

[0046] The horizontal axis of these graphs shows the value of the coefficient β, which represents the total amount of the viscous damper 30. The damping coefficient C of the connecting section between the base-isolated building 10 and the base-isolated building 20. j This is done using the damping coefficient C1 and coefficient β of the seismic isolation layer in the seismic isolation building 10. j This is expressed as =β·C1.

[0047] When the total amount of viscous dampers 30 is "0," that is, when the base-isolated building 10 and base-isolated building 20 are not connected, the value of the coefficient β is 0. As the total amount of viscous dampers 30 increases, the value of the coefficient β increases.

[0048] Furthermore, the vertical axes of these graphs represent the dimensionless inter-building displacement between base-isolated building 10 and base-isolated building 20 (curve K1), the shear force multiplier input to base-isolated building 10 (curve K2), and the shear force multiplier input to base-isolated building 20 (curve K3).

[0049] In other words, these graphs show the dimensionless inter-building displacement between base-isolated building 10 and base-isolated building 20 (curve K1), the shear force multiplier applied to base-isolated building 10 (curve K2), and the shear force multiplier applied to base-isolated building 20 (curve K3) as functions of the coefficient β.

[0050] "Dimensionless inter-building displacement" is the response ratio of inter-building displacement to ground displacement. The larger this value, the greater the inter-building displacement between base-isolated building 10 and base-isolated building 20.

[0051] The "shear force ratio" is the ratio of the maximum dimensionless shear force when each building (base-isolated building 10 and base-isolated building 20) is connected to the maximum dimensionless shear force when it is not connected. If this value is less than 1.0, the shear force input when connected is smaller than when it is not connected. If this value is 1.0 or greater, the shear force input when connected is greater than or equal to the shear force input when it is not connected.

[0052] These relationships are then derived by varying the natural period T2 and damping constant h2 of the base-isolated building 20. In Figures 2(A) to (C), the natural period T1 of the base-isolated building 10 is constant at 3 [sec] and the damping constant h1 is constant at 0.2. On the other hand, in Figure 2(A), the natural period T2 of the base-isolated building 20 is 4 [sec] and the damping constant h2 is 0.1. In Figure 2(B), the natural period T2 of the base-isolated building 20 is 3 [sec] and the damping constant h2 is 0.3. In Figure 2(C), the natural period T2 of the base-isolated building 20 is 4 [sec] and the damping constant h2 is 0.3.

[0053] In this way, for a base-isolated building 10 with a natural period T1 of 3 [sec] and a damping constant h1 of 0.2, the natural period T2 and damping constant h2 of the planned base-isolated building 20 are swapped, and the dimensionless inter-building displacement between base-isolated building 10 and base-isolated building 20 (curve K1), the shear force multiplier input to base-isolated building 10 (curve K2), and the shear force multiplier input to base-isolated building 20 (curve K3) are calculated according to the coefficient (β: horizontal axis) that represents the total amount of viscous dampers 30.

[0054] (Step 3) Next, the natural period T2 of the base-isolated building 20, the damping constant h2, and the coefficient β are determined in such a way that the inter-building displacement is reduced compared to the case where the base-isolated building 10 and the base-isolated building 20 are not connected, and both the shear force input to the base-isolated building 10 and the shear force input to the base-isolated building 20 are reduced.

[0055] Let me explain step 3 in more detail.

[0056] • Examination of the damping constant h2 For example, in Figures 2(A) and 2(C), the natural period T2 of the base-isolated building 20 is the same at 4 [sec], while in Figure 2(A) the damping constant h2 of the base-isolated building 20 is 0.1, and in Figure 2(C) the damping constant h2 of the base-isolated building 20 is 0.3.

[0057] Comparing the relationships shown in these figures, it can be seen that when the damping constant h2 of the base-isolated building 20 is larger (Figure 2(C)), the dimensionless inter-building displacement is smaller (curve K1), and the shear force input to the base-isolated building 10 is also smaller (curve K2). On the other hand, when the damping constant h2 of the base-isolated building 20 is larger (Figure 2(C)), the shear force input to the base-isolated building 20 is larger (curve K3).

[0058] In this way, by changing the damping constant h2 of the base-isolated building 20, it is possible to understand the trends in how the dimensionless inter-building displacement between the base-isolated building 10 and the base-isolated building 20 (curve K1), the shear force multiplier input to the base-isolated building 10 (curve K2), and the shear force multiplier input to the base-isolated building 20 (curve K3) change.

[0059] It should be noted that this trend is not necessarily uniquely determined as described above. This trend can change depending on the values ​​adopted for the weight, natural period T1, and damping constant h1 of the base-isolated building 10, and the weight and natural period T2 of the base-isolated building 20.

[0060] • Examination of natural period T2 Furthermore, for example, in Figures 2(B) and (C), the damping constant h2 of the base-isolated building 20 is the same at 0.3, while in Figure 2(B) the natural period T2 of the base-isolated building 20 is 3 [sec], and in Figure 2(C) the natural period T2 of the base-isolated building 20 is 4 [sec].

[0061] Comparing the relationships shown in these figures, it can be seen that when the natural period T2 of the base-isolated building 20 is longer (Figure 2(C)), the dimensionless inter-building displacement is larger (curve K1) and the shear force input to the base-isolated building 10 is also larger (curve K2). On the other hand, when the natural period T2 of the base-isolated building 20 is longer (Figure 2(C)), the shear force input to the base-isolated building 20 is smaller (curve K3).

[0062] In this way, by changing the natural period T2 of the base-isolated building 20, it is possible to understand the trends in how the dimensionless inter-building displacement between the base-isolated building 10 and the base-isolated building 20 (curve K1), the shear force multiplier input to the base-isolated building 10 (curve K2), and the shear force multiplier input to the base-isolated building 20 (curve K3) change.

[0063] It should be noted that this trend is not necessarily uniquely determined as described above. This trend can change depending on the values ​​adopted for the weight of the base-isolated building 10, its natural period T1, its damping constant h1, and the weight of the base-isolated building 20, as well as its damping constant h2.

[0064] Selection of damping constant h2 and natural period T2 The damping constant h2 and natural period T2 are selected such that region D exists, as shown in Figures 2(A) and (C). Region D is the range of coefficient β values ​​that satisfy all three of the following conditions.

[0065] (Condition 1) The dimensionless inter-building displacement (curve K1) can be reduced compared to the unconnected state (β=0).

[0066] (Condition 2) The shear force ratio (curve K2) input to the seismically isolated building 10 can be reduced to or less than the unconnected state (β=0).

[0067] (Condition 3) The shear force multiplier (curve K3) input to the seismically isolated building 20 can be reduced to or less than that when the building is not connected.

[0068] For example, in Figure 2(B), the shear force multiplier (curve K3) input to the base-isolated building 20 is greater than 1, so condition 3 is not met. Therefore, the natural period T2 of the base-isolated building 20 is set to 4 [sec] as shown in Figures 2(A) and (C), rather than 3 [sec] as shown in Figure 2(B).

[0069] Comparing Figures 2(A) and 2(C), although the shear force (curve K3) input to the base-isolated building 20 is greater in Figure 2(C) than in Figure 2(A), the reduction in dimensionless inter-building displacement (curve K1) is greater in Figure 2(C). Therefore, the damping constant h2 for the base-isolated building 20 should be 0.3 in Figure 2(C) rather than 0.1 in Figure 2(A).

[0070] Thus, the damping constant h2 and natural period T2 are selected by comprehensively evaluating the dimensionless inter-building displacement between the base-isolated building 10 and base-isolated building 20 (curve K1), the shear force multiplier input to base-isolated building 10 (curve K2), and the shear force multiplier input to base-isolated building 20 (curve K3).

[0071] Note that the selection method for the damping constant h2 and natural period T2 shown here is just one example, and the selection method can be appropriately changed depending on the required conditions.

[0072] • Examination of the coefficient β representing the total amount of the viscous damper 30. The coefficient β is tentatively determined from the values ​​included in region D. The criteria for tentatively determining the coefficient β can be appropriately determined according to the required conditions, such as the value that minimizes the dimensionless inter-building displacement (curve K1), the value that minimizes the shear force multiplier input to the base-isolated building 10 (curve K2), or the value that minimizes the shear force multiplier input to the base-isolated building 20 (curve K3).

[0073] Furthermore, in addition to the conditions defining region D described above, conditions such as β > 0.1 may be added. This is because in the region where β ≤ 0.1 in Figures 2(A) and (C), the reduction effect of the dimensionless inter-building displacement (curve K1) compared to the unconnected state is small. The threshold value of 0.1 can be changed as appropriate.

[0074] (Step 4) Next, the structure of the base-isolated building 20 and the viscous damper 30 is examined based on the determined natural period T2 of the base-isolated building 20, the damping constant h2, and the provisionally determined coefficient β.

[0075] (Step 5) Steps 2-4 are repeated to examine the structure of the base-isolated building 20 and the viscous damper 30. Furthermore, as the design of the base-isolated building 20 progresses, it is preferable to perform seismic frequency response analysis on more complex models, such as multi-mass models or three-dimensional models, instead of the two-mass model. Finally, the coefficient β is determined by repeating steps 2-4.

[0076] (Step 6) Based on the structure of the base-isolated building 20 and the viscous damper 30 considered in steps 4 and 5, the base-isolated building 20 is constructed, and the base-isolated building 10 and the base-isolated building 20 are connected by the viscous damper 30.

[0077] <effect> In the building connection structure and building connection method according to the embodiment of the present invention, as shown in Figure 1(A), two base-isolated buildings 10 and 20 are connected by a viscous damper 30. This absorbs energy in response to the relative displacement (or velocity) of the two base-isolated buildings 10 and 20, making it easier to reduce the inter-building displacement of the two base-isolated buildings 10 and 20 compared to the case where the two base-isolated buildings 10 and 20 are not connected.

[0078] Furthermore, even when connecting buildings 10 and 20 with passageways in order to utilize them as a single unit, inter-building displacement can be reduced, allowing for a more minimal expansion joint configuration.

[0079] Furthermore, by connecting the base-isolated buildings 10 and 20 with viscous dampers 30, the shear force applied to both base-isolated buildings 10 and 20 can be easily reduced. This allows for a minimal reinforcement structure for the two base-isolated buildings 20 and 30.

[0080] In contrast, in the comparative example where the two base-isolated buildings are connected by an elastic member (rigid connection), as shown in Figure 3, the shear force multiplier (curve K3) input to base-isolated building 20 is more easily amplified than when they are not connected. Also, although not shown in the figure, the shear force multiplier (curve K2) input to base-isolated building 10 may also be amplified than when they are not connected. In other words, the shear force multiplier input to either of the base-isolated buildings is more easily amplified than when they are not connected.

[0081] Note that the horizontal axis of the graph shown in Figure 3 represents the value of the coefficient α, which indicates the total amount of elastic members. The rigidity K of the connecting section that links base-isolated building 10 and base-isolated building 20. j The stiffness K1 of the seismic isolation layer in the seismic isolation building 10 and the coefficient α are used to determine K j This is expressed as =α·K1.

[0082] In the example shown in Figure 3, similar to Figure 2(C), the natural period T1 of the base-isolated building 10 is 3 [sec] and the damping constant h1 is 0.2, while the natural period T2 of the base-isolated building 20 is 4 [sec] and the damping constant h2 is 0.3.

[0083] Furthermore, in the building connection structure according to the embodiment of the present invention, the two base-isolated buildings each have different natural periods. That is, the natural period of one base-isolated building is longer than the natural period of the other base-isolated building. As a result, the shear force input to one of the base-isolated buildings is easily reduced.

[0084] Specifically, the natural period of the later-completed base-isolated building 20 is longer than that of the earlier-completed base-isolated building 10, approximately 1.1 times longer. This makes it easier to reduce the shear force applied to the later-completed base-isolated building.

[0085] Figure 4(A) shows the dimensionless inter-building displacement between seismic isolation building 10 and seismic isolation building 20 (curve K1), the shear force multiplier input to seismic isolation building 10 (curve K2), and the shear force multiplier input to seismic isolation building 20 (curve K3) as functions of the coefficient β, when the natural period T1 of seismic isolation building 10 is 3 [sec], the damping constant h1 is 0.1, the natural period T2 of seismic isolation building 20 is 3.15 [sec] (i.e., 1.05 times T1), and the damping constant h2 is 0.15.

[0086] In the region D described above, if the condition for determining the coefficient β is "the value that minimizes the shear force multiplier (curve K2) input to the base-isolated building 10", then β is approximately 0.15, and the dimensionless inter-building displacement corresponding to this β is approximately 0.8 times that of the case where the two buildings are not connected (β=0).

[0087] On the other hand, Figure 4(B) shows the dimensionless inter-building displacement between seismic isolation building 10 and seismic isolation building 20 (curve K1), the shear force multiplier input to seismic isolation building 10 (curve K2), and the shear force multiplier input to seismic isolation building 20 (curve K3) as functions of the coefficient β, when the natural period T1 of seismic isolation building 10 is 3 [sec], the damping constant h1 is 0.1, the natural period T2 of seismic isolation building 20 is 3.3 [sec] (i.e., 1.1 times T1), and the damping constant h2 is 0.15.

[0088] In the region D described above, if the condition for determining the coefficient β is set to "the value that minimizes the shear force multiplier (curve K2) input to the base-isolated building 10," as in Figure 4(A), then β is approximately 1.00, and the dimensionless inter-building displacement corresponding to this β is approximately 0.4 times that of the case where the two buildings are not connected (β=0).

[0089] In other words, the reduction effect of dimensionless inter-building displacement when the natural period T2 of the base-isolated building 20 is set to 1.1 times the natural period T1 of the base-isolated building 10 is more significant than when the natural period T2 of the base-isolated building 20 is set to 1.05 times the natural period T1 of the base-isolated building 10.

[0090] In this invention, the natural period T2 of the base-isolated building 20 is not necessarily required to be 1.1 times the natural period T1 of the base-isolated building 10; it may be less than or greater than 1.1 times. Furthermore, the natural period T2 of the base-isolated building 20 may be equal to or less than the natural period T1 of the base-isolated building 10.

[0091] Furthermore, in the building connection structure according to the embodiment of the present invention, the damping constants of the two base-isolated buildings are different. That is, the damping constant of one base-isolated building is greater than the damping constant of the other base-isolated building.

[0092] Specifically, the damping constant h2 of the later-completed base-isolated building 20 is greater than the damping constant h1 of the earlier-completed base-isolated building. This makes it easier to reduce the inter-building displacement between the two base-isolated buildings. In addition, the shear force input to the earlier-completed base-isolated building 10 is also easier to reduce.

[0093] As an example, in the example shown in Figure 2(C), the dimensionless inter-building displacement (curve K1) is smaller and the shear force multiplier (curve K2) input to the base-isolated building 10 is smaller compared to the example shown in Figure 2(A).

[0094] In this invention, the damping constant h2 of the base-isolated building 20 is not necessarily required to be greater than the damping constant h1 of the base-isolated building 10; the damping constant h2 of the base-isolated building 20 may be equal to or less than the damping constant h1 of the base-isolated building 10.

[0095] Furthermore, in this building connection method, when connecting the base-isolated building 10 and base-isolated building 20 with a viscous damper 30, the natural period T2 of the base-isolated building 20, the damping constant h2, and a coefficient β representing the total amount of the viscous damper are determined to reduce the inter-building displacement of the two buildings and reduce the shear force input to both base-isolated buildings.

[0096] This makes it possible to more reliably reduce the inter-building displacement between the two base-isolated buildings 10 and 20, and to reduce both the shear force applied to the two base-isolated buildings. [Explanation of symbols]

[0097] 10. Seismic isolation buildings 20 Seismic isolation buildings 30 Viscous dampers

Claims

1. Two base-isolated buildings are connected by viscous dampers. The two aforementioned base-isolated buildings were completed at different times. A building linkage structure in which the natural period of the later-completed base-isolated building is longer than the natural period of the earlier-completed base-isolated building.

2. The building connection structure according to claim 1, wherein the two base-isolated buildings each have different damping constants.

3. The damping constant of the base-isolated building that was completed later is greater than the damping constant of the base-isolated building that was completed earlier. The building connection structure according to claim 2.

4. The viscous damper connecting the two base-isolated buildings is provided on only one layer. The building connection structure according to any one of claims 1 to 3, wherein the viscous damper is connected to the floor directly above the seismic isolation layer or to the ground floor of at least one of the seismically isolated buildings.

5. The process of constructing the first seismically isolated building, A step of calculating the inter-building displacement between the first and second base-isolated buildings, the shear force input to the first base-isolated building, and the shear force input to the second base-isolated building, according to a coefficient representing the total amount of viscous dampers connecting the first and second base-isolated buildings, using the natural period and damping constant of the first base-isolated building and the second base-isolated building to be constructed adjacent to the first base-isolated building as variables, A step of determining the natural period, damping constant, and coefficient of the second base-isolated building in such a way that the inter-building displacement is reduced compared to the case where the first base-isolated building and the second base-isolated building are not connected, and both the shear force input to the first base-isolated building and the shear force input to the second base-isolated building are reduced. A building connection method equipped with [a specific feature / feature].

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