JP5948457B1 - Seismic isolation structure - Google Patents

Abstract

[PROBLEMS] To absorb an excessive seismic energy portion instead of a seismic isolation device body even when a large earthquake is encountered, thereby preventing excessive deformation of the seismic isolation device so that the seismic isolation device body is not damaged. To provide a seismically isolated building structure equipped with a deformation control device that can be easily replaced after an earthquake. A clearance A is formed between the rising wall 8 of the base-isolated building structure and the base-isolated building structure frame, and a pit is formed between the base structure 1 and the upper structure 2, and the clearance A is required. Is provided with a deformation control device 13. The deformation control device 13 includes an energy absorbing member 14 and a deformation stopper member 15. After the earthquake, the deformation control device 13 is restored to the original state together with the seismic isolation device. Furthermore, when a large earthquake occurs, the deformation stopper member 15 contacts and presses against the energy absorbing member 14, and the energy absorbing member 14 is crushed to absorb the seismic energy, so that the seismic isolation device is not excessively deformed and broken. Act on. [Selection] Figure 1

Description

  The present invention relates to a base-isolated building structure.

  In the base-isolated building structure, it is known that the natural period of the building is lengthened to reduce the earthquake input, and the force received by the building during the earthquake is reduced. As such a base-isolated building structure, the base structure and the superstructure are separated, and a base isolation device is installed between them to absorb the seismic energy. Generally, a seismic isolation device is roughly divided into two devices, an isolator and a damper. There are two types of isolators: a laminated rubber type and a sliding type, which have the role of extending the natural period of the building and at the same time support the weight of the building. Some isolators also have a damper function. The damper is a device that serves to suppress the shaking width of the building during an earthquake and to quickly stop the shaking, and does not support the weight of the building. The sliding system has a sliding bearing and a rolling bearing, and has a feature that it is difficult to transmit the ground shaking to the upper building because the friction coefficient is very small. However, laminated rubber is still widely used as a seismic isolation device for seismic isolation buildings, but this type of seismic isolation device is made by laminating thin rubber plates and steel plates alternately and bonding them horizontally. Is flexible and has a seismic isolation function that returns to its original position even if it is deformed, but it is hard in the vertical direction so that it can fully support the load of the superstructure. It cannot be handled. When a large tensile force is generated between the upper structure and the lower structure due to the rocking phenomenon during an earthquake, the seismic isolation device is damaged, and the upper structure is separated from the foundation structure.

  In order to solve the above problems, a plurality of inventions are disclosed as conventional techniques. For example, as a first prior art, a seismic isolation device is installed between the foundation structure and the upper structure cut off, and a PC steel material inclined in a predetermined direction over the foundation structure and the upper structure is provided, The PC steel material has one end fixed to the footing of the foundation structure, and the other end fixed to a fire plate attached over the end of one beam joined to the column and the end of the other beam. It is a seismic building structure (see Patent Document 1).

  According to this seismic isolation structure, since the foundation structure and the upper structure are connected by the PC steel material, the vertical structure prevents the upper structure from being separated from the foundation structure by the vertical load caused by the earthquake. In addition, the horizontal load due to the earthquake is attenuated by the seismic isolation isolators to reduce the horizontal shaking of the superstructure. Furthermore, the horizontal load or the vertical load caused by the earthquake can be attenuated by the PC steel material and the seismic isolation device, and the load can be resisted.

  In addition, as a second related art that is publicly known, a seismic isolation device is installed between a steel pipe pile and a foundation that is edge-cut, and the seismic isolation device is formed on the root wound concrete formed around the pile head. Installed, the root winding concrete is formed so that the concrete filled in the steel pipe overflows and covers the pile head protruding from the ground, and a tensile material is provided across the steel pipe pile and the foundation through the seismic isolation device This is a seismically isolated structure (see Patent Document 2).

  According to this seismic isolation structure, it is possible to avoid the yielding of the thin rubber plate of the seismic isolation device against a large earthquake, so there is no need to replace the seismic isolation device. In addition, because the seismic action works by avoiding resonance due to the occurrence of a huge earthquake on buildings that have the possibility of long-period ground vibration, the thin rubber plate of the seismic isolation device yields and the building is restored to its original position. There is no need to return to In addition, the upper and lower ends of the seismic isolation device can prevent the vertical shock wave from being amplified by the direct earthquake motion, so that the thin rubber plate in the seismic isolation device can be prevented from deteriorating and yielding.

Japanese Patent No. 3333163 Japanese Patent No. 3982585

  However, in the first and second prior arts, since both of the configurations cannot be exchanged, when a PC steel material yields or breaks when it encounters a maximum earthquake more than expected in design, it is restored after the earthquake. If the PC steel hung between the superstructure and the foundation structure is relatively short due to the height of the seismic isolation device, the elongation of the PC steel when subjected to a tensile load Therefore, the seismic isolation device may be damaged due to an abrupt breakage due to the impact force of the earthquake. Furthermore, in the second prior art, since the tensile material is provided through the seismic isolation device, the mass-produced product cannot be adopted as the seismic isolation device and becomes a custom-made product. There is a problem that the options for using seismic devices are greatly reduced.

  In addition, as described above, by utilizing the characteristics of laminated rubber and sliding systems, it has recently been possible to reduce the cost by building a seismically isolated building using both laminated rubber bearings and sliding bearings. It has become like this.

  However, seismic design is based on the Building Standards Law, but in recent trends, the occurrence of huge earthquakes exceeding the seismic intensity (5-6 weak) specified in the Building Standards Law has increased. ing. In the event of a huge earthquake that exceeds the design assumption, even if a base-isolated building is constructed using both the above-mentioned laminated rubber bearing and sliding bearing, the sliding bearing cannot suppress the horizontal displacement of the building. Not only does the excessive deformation exceeding the allowable horizontal deformation occur and breaks, but there is also a risk that the building will slip too much and fall. For this reason, it is necessary to increase the number of laminated rubber bearings and damping dampers, which causes a problem that the cost increases.

  Moreover, in existing seismic isolation buildings, the earthquake assumed in the design at that time is lower than the current huge earthquake, so the seismic isolation device itself is not only damaged due to excessive deformation of the seismic isolation device, but also the shaking of the building does not stop There is also a report that it was unusable without reinforcement because of excessive displacement.

  Therefore, the present invention absorbs an excessive seismic energy portion instead of the seismic isolation device main body even if it encounters a huge earthquake exceeding the design assumption, and the seismic isolation device main body suppresses excessive deformation of the seismic isolation device. The object of the present invention is to provide a base-isolated building structure that is provided with a deformation control device that is inexpensive and can be easily replaced after an earthquake.

As a specific means for achieving the above object, the present invention provides a base-isolated building structure in which a base isolation device is interposed between a base structure and an upper structure. A clearance is formed between the outer peripheral rising wall of the base-isolated building structure and the upper structural frame of the base-isolated building, and a pit is formed between the foundation structure and the upper structure. Is provided with a deformation control device comprising an energy absorbing member and a deformation stopper member installed with a required gap distance, and the required gap distance is adjusted to 70 to 80% of the deformation limit allowable value of the seismic isolation device. the deformable stop member is in contact with the energy absorbing member is set to begin elastic deformation control Te, wherein the energy absorbing member is elastically deformed to absorb the seismic energy, the isolator There is provided a seismic isolation building structure, characterized in that are not exceed the shape limit tolerance.

A second invention according to the present invention is a base-isolated building structure in which a base isolation device is interposed between the foundation structure and the upper structure, and the outer peripheral rising wall of the base isolation structure and the base isolation A clearance is formed between the upper structure of the building and a pit is formed between the foundation structure and the upper structure, and an energy absorbing member installed at a required position of the pit with a required play distance; A deformation control device comprising a deformation stopper member is provided, and the deformation stopper member abuts against the energy absorbing member so that the required play distance is set to 70 to 80% of the deformation limit allowable value of the seismic isolation device. set to begin elastic deformation control, the energy absorbing member is elastically deformed to absorb the seismic energy, characterized in that you have not exceed the deformation limit allowable value of the isolator There is provided a seismic building structure.

In the first and second aspects of the invention, the deformation control device includes an energy absorbing member and a deformation stopper member that are installed with a required clearance, and the energy absorbing member has a multistage structure, and an elastic body is provided at each stage. Or, it is composed of a viscoelastic body and a plate; the spring coefficient of the elastic body in each step is different, and is increased in order from the surface to the mounting portion, and the order of the size is the following relationship K2 = α2 ・ K1,
K3 = α3 · K2, ...
Kn = αn · K (n−1)
K 1, K 2, K 3,... Kn: Spring coefficient of each stage elastic body in order from the surface α 2, α 3,.
1 <α2, α3, ... ・ αn <10
n: the number of steps; and the characteristics of the spring coefficient of the elastic body include, as additional requirements, either a linear spring or a non-linear spring.

According to the base-isolated building structure according to the first and second aspects of the present invention, the clearance formed between the outer peripheral rising wall of the base-isolated building structure and the upper structure of the base-isolated building, or the foundation structure A deformation control device comprising an energy absorbing member and a deformation stopper member installed with a required play distance is provided at a required portion of a pit formed between the upper structure and the upper structure. In accordance with 70 to 80% of the deformation limit allowable value of the seismic device, the deformation stopper member is set in contact with the energy absorbing member so as to start elastic deformation control, and the energy absorbing member is elastically deformed to reduce the seismic energy. By absorbing and not exceeding the deformation limit allowable value of the seismic isolation device, the following effects can be obtained.
1. A deformation control device is installed together with the seismic isolation device with a required play distance , and the required play distance is adjusted so that the deformation stopper member abuts on the energy absorbing member according to 70 to 80% of the allowable limit of deformation of the seismic isolation device. By setting to start deformation control and not exceeding the deformation limit tolerance, even if a large earthquake exceeding the design expectation is encountered, excessive seismic energy is absorbed instead of the seismic isolation device body. In addition, the excessive deformation of the seismic isolation device can be suppressed to prevent the seismic isolation device body from being damaged, and the safety of the entire base isolation building structure can be greatly enhanced.
2. In accordance with 70 to 80% of the allowable deformation limit of the seismic isolation device, the deformation control device is installed so as not to exceed the allowable deformation limit. It can be used in combination with a bearing, and an inexpensive and highly safe base-isolated building structure can be constructed.
3. The installed deformation control device has a structure that can be easily replaced. Therefore, even if an elastic body that forms a deformation control device absorbs energy and becomes crushed after encountering a huge earthquake, the seismic isolation device Damage to the main body can be avoided, and it can be easily replaced at low cost after an earthquake.
4). The deformation control device can be easily installed and used to reinforce existing seismic isolation buildings.
5. In addition to the displacement control effect, a seismic control (vibration) effect can be obtained, which can be used as a seismic control (vibration) damper, and is cheaper and more cost-effective than conventional expensive seismic control (vibration) dampers.

It is sectional drawing which showed schematically the principal part of the seismic isolation building structure which concerns on the 1st Embodiment of this invention. It is sectional drawing which showed schematically the state which the deformation | transformation control apparatus acted when receiving the huge earthquake in the base-isolated building structure which concerns on the embodiment. The cross section of the energy absorption member of the deformation | transformation control apparatus in the base-isolated building structure which concerns on the embodiment is expanded and shown, (a) is sectional drawing before receiving a huge earthquake energy, (b) is a huge earthquake It is sectional drawing which shows the state which received energy. The spring characteristic of the elastic body which comprises the deformation | transformation control apparatus in the base-isolated building structure which concerns on the embodiment is shown, (a) is a graph which shows the linear spring of an elastic body, (b) is the nonlinear spring of a viscoelastic body It is a graph which shows. It is sectional drawing which showed schematically the structure which protects a deformation | transformation control apparatus as an Example in the seismic isolation building structure which concerns on the same embodiment. It is sectional drawing which shows the state which received the huge earthquake energy in the Example in the seismic isolation building structure which concerns on the same embodiment. It is sectional drawing which showed schematically the principal part of the seismic isolation building structure which concerns on the 2nd Embodiment of this invention. It is sectional drawing which showed schematically the state which the deformation | transformation control apparatus acted when receiving the huge earthquake in the base-isolated building structure which concerns on the embodiment. It is sectional drawing which showed schematically the structure which protects a deformation | transformation control apparatus as an Example in the seismic isolation building structure which concerns on the same embodiment. It is sectional drawing which shows the state which received the huge earthquake energy in the Example in the seismic isolation building structure which concerns on the same embodiment. It is the top view which showed schematically only the principal part of the state which attached the seismic isolation apparatus and deformation control apparatus in the base isolation building structure which concerns on the 3rd Embodiment of this invention. It is the side view which showed schematically only the principal part of the state which attached the deformation | transformation control apparatus in the base isolation building structure which concerns on the embodiment. It is the side view which showed schematically only the principal part of the state which attached the seismic isolation apparatus in the base isolation building structure which concerns on the embodiment. It is the side view which showed schematically the state which the deformation | transformation control apparatus acted in the state which attached the seismic isolation apparatus in the base isolation building structure which concerns on the embodiment, and received the huge earthquake. It is the side view which expanded and showed the deformation | transformation stopper member which comprises the deformation | transformation control apparatus in the seismic isolation building structure which concerns on the embodiment. It is the side view which expanded and showed only the principal part of the state which attached the deformation | transformation control apparatus in the base-isolated building structure which concerns on the embodiment. It is the side view which expanded and showed schematically the other Example in the base-isolated building structure which concerns on the same embodiment. It is the side view which showed schematically only the principal part of the state which attached the seismic isolation apparatus and deformation control apparatus in the base isolation building structure which concerns on the 4th Embodiment of this invention. It is the side view which showed schematically the state which the deformation | transformation control apparatus acted in the state which attached the seismic isolation apparatus and deformation control apparatus in the base isolation building structure which concerns on the embodiment, and received the huge earthquake.

  The present invention will be described in detail based on a plurality of illustrated embodiments. First, the base-isolated building structure according to the first embodiment shown in FIGS. In FIG. 1, the base-isolated building structure basically has a base-isolation device 3 disposed between the foundation structure 1 and the upper structure 2, and the foundation structure 1 is attached to the head of a pile 5 driven into the ground 4 with a wrinkle foundation 6. And a mat slab 7 that covers the periphery of the head of the pile 5 and the upper surface of the ground 4, and a rising wall 8 that is connected to the mat slab 7 and surrounds the outer periphery of the foundation portion. The superstructure 2 is provided with footings 10 for supporting the pillars 9 of the building, and a large beam (underground beam) 11 for connecting the footings 10, and a slab 12 is formed on the upper surface of the large beam 11. Yes. And the seismic isolation apparatus 3 is installed between the pile foundation 6 and footing 10 of a pile head. Further, a clearance A is formed between the rising wall 8 and the upper structural frame 2 (footing 10 in FIG. 1) of the base-isolated building.

  The first invention according to the present invention is characterized in that a deformation control device 13 is provided in the clearance A. That is, the deformation control device 13 includes an energy absorbing member 14 and a deformation stopper member 15. The deformation control device 13 is provided with a required boxing recess 16 on the rising wall 8 and disposed with one energy absorbing member 14. The deformation stopper member 15 is attached to the footing 10 side so as to face the energy absorbing member 14. What is important in this case is to install the energy absorbing member 14 and the deformation stopper member 15 with a required clearance a.

  As shown in FIG. 2, when an earthquake occurs, the seismic energy from the foundation structure 1 is absorbed by the seismic isolation device 3 so that the vibration is not transmitted to the upper structure 2. When an earthquake that exceeds the limit (allowable deformation capacity) occurs, the deformation control device 13 absorbs the seismic energy and controls deformation due to shaking before the limit is exceeded. In other words, the seismic energy can be sufficiently absorbed by the seismic isolation device 3 within the designed earthquake range. However, when an earthquake exceeding the seismic energy occurs, the deformation stopper member 15 is moved before the limit of the seismic isolation device 3 is exceeded. It abuts on the energy absorbing member 14 and absorbs seismic energy by elastic deformation of the energy absorbing member 14 so as not to exceed the limit of the seismic isolation device 3. After the earthquake, the deformation control device 13 is restored to the original state together with the seismic isolation device 3. Further, when a huge earthquake more than expected in design occurs, the deformation stopper member 15 is pressed against the energy absorbing member 14 and the energy absorbing member 14 is crushed to absorb the seismic energy, and the seismic isolation device 3 is excessive. It prevents deformation and breakage. The outer peripheral portion including the rising wall 8 is entirely covered with a lid member 19.

  As shown in FIG. 3 (a), the energy absorbing member 14 in the deformation control device 13 has a multistage structure of two or more stages of a plate 17 and an elastic body or viscoelastic body 18, and the plate 17 is made of metal. The elastic body is, for example, appropriately selected from natural rubber, synthetic rubber, high damping rubber, or low rebound elastic rubber, and the viscoelastic body is, for example, a low rebound material or silicone. The resin is appropriately selected from resins and used, and is not particularly limited. The elastic body or viscoelastic body at each stage can be made of the same material. Moreover, both an elastic body and a viscoelastic body can also be used. For example, in the case of four stages, the first stage can be a viscoelastic body, and the second and subsequent stages can be an elastic body.

Further, the elastic body at each stage is made of a different material, and the first stage is K1, the second and subsequent stages are K2, K3,... Kn so that the elastic body has a different spring coefficient. It is preferable that the size is increased to the mounting portion in order, and the order of the sizes is as follows.
K2 = α2 ・ K1,
K3 = α3 · K2, ...
Kn = αn · K (n−1)
K 1, K 2, K 3,... Kn: Spring coefficient of each stage elastic body in order from the surface α 2, α 3,.
1 <α2, α3, ... ・ αn <10
n: Number of stages

Thus, it is preferable to sufficiently absorb the seismic energy and soften the impact of the seismic force by changing the hardness of the elastic body at each stage and adjusting the deformation amount of the elastic body in order from the surface to the mounting portion. For example, in the case of four stages, the softest one in the first stage, for example, a low resilience elastic rubber, is deformed first, absorbs energy and softens the impact of seismic force, and the deformation capacity is almost exhausted. From the second stage, the soft elastic rubber of the second stage is continuously deformed and absorbs energy in the same manner. After that, it becomes hard to deform by hardening in the order of the third stage and the fourth stage, as shown in FIG. The deformation amount of each stage at the maximum deformation becomes Δ1>δ2>δ3> δ4, and the excessive deformation of the seismic isolation device can be prevented.
Note that the extra coefficients α2, α3... Αn of each stage can be appropriately set according to the use type of the seismic isolation device, the arrangement method, the size, weight, and ground condition of the building. For example, in the case of four stages, α2: α3: α4 = 1: 2: 3 may be set, and α2: α3: α4 = 2: 2: 2 may be set. Furthermore, there is a possibility that α2: α3: α4 = 1: 3: 8. The arrow P indicates the pressing force by the deformation stopper member 15 based on the earthquake shaking.

  The gap distance a can be set in advance according to the allowable deformation capacity (maximum allowable deformation value) of the seismic isolation device 3. For example, when the allowable maximum deformation angle of the laminated rubber bearing in the seismic isolation device 3 is 45 degrees, the play distance a is adjusted to the amount of deformation when the deformation angle of the laminated rubber bearing is 35 degrees to 40 degrees. It is desirable to set them. That is, it is preferable to set the required play distance a in accordance with 70% to 80% of the allowable deformation capacity (maximum allowable deformation value) of the seismic isolation device 3. For example, when the deformation capacity reaches 70% of the allowable deformation capacity, the deformation stopper member 15 comes into contact with the energy absorbing member 14 to start deformation control, and the elastic rubber 18 as the first-stage elastic material on the surface deforms the most. As the energy is absorbed, the impact of the seismic force is reduced, and the deformation amount of the elastic rubber 18 is sequentially reduced from the second stage. When the deformation of the seismic isolation device 3 is increased, the deformation of each of the next-stage elastic bodies is sequentially increased and the energy is absorbed to control the deformation of the seismic isolation device 3. After the earthquake, the deformation control device 13 is restored to the original state together with the seismic isolation device 3. In the event of a large earthquake that exceeds the design assumption, when the deformation angle, which is the maximum allowable deformation value of the seismic isolation device 3, reaches 45 degrees, the deformation of the deformation control device also becomes maximum, and the seismic isolation device 3 exceeds that. In order to prevent deformation, the elastic rubber 18 is sequentially crushed instead of the seismic isolation device 3 to absorb energy and suppress deformation. In other words, the seismic isolation device main body is a structural mechanism that controls the displacement of the entire seismic isolation building in response to the deformation control device 13 so that the seismic isolation device 3 suppresses deformation exceeding the maximum allowable deformation value without being damaged. . In addition, when the deformation control device 13 is plastically deformed and crushed by a huge earthquake, the deformation control device 13 can be easily replaced after the earthquake, so that the seismic isolation building structure can be quickly restored.

  Further, as shown in FIGS. 4A and 4B, the spring characteristic of the elastic body can be either a linear spring or a non-linear spring. Thus, it goes without saying that the elastic body is the most common fully elastic rubber. In addition, the load increases as the first rigidity up to the yield point load Q, and after reaching the yield point, the load does not increase but only the deformation proceeds, and after a certain deformation, the load increases again as the second rigidity. By using a non-linear elastic rubber having a characteristic that the second rigidity is higher than the first rigidity and the rubber becomes hard, the first rigidity stage until yielding acts mainly as an energy absorption stage, and the second after the yielding. In the stiffness stage, it mainly acts as a displacement control stage.

  The deformation stopper member 15 is preferably made of, for example, a lightweight and high-strength steel frame, but is not limited to this, and may be a concrete block in which steel plates are driven into the front and back surfaces. The shape may be circular, square, or polygonal. The size of the surface is made smaller than the surface of the energy absorbing member 14, and even if the vertical displacement occurs due to the shaking of the seismic isolation building, it is ensured that the surface of the energy absorbing member 14 is reliably contacted.

  Further, as another example according to the first embodiment, as shown in FIGS. 5 and 6, for example, fall of stone rollers, mud, etc. from the outside in the deformation control device 13 installed in the clearance A. It is desirable to protect the deformation control device 13 by attaching a resin bellows-like cover 20 so that objects and small animals such as mice do not enter. By attaching the cover in this way, the deformation control device 13 always functions normally in any case.

Next, the seismic isolation building structure according to the second embodiment will be described with reference to FIGS.
This base-isolated building structure is different from the base-isolated building structure of the first embodiment except that only a part of the structure and the mounting position of the deformation control device 13 are different, and other components are substantially the same. Therefore, the same reference numerals are assigned and explanations of the details will be omitted because they are duplicated.
That is, as shown in FIG. 7, the deformation control device 13 is installed in the clearance A formed between the rising wall 8 surrounding the outer periphery and the footing 10. That is, the deformation control device 13 includes an energy absorbing member 14 and a deformation stopper member 15, and the energy absorbing member 14 is attached to the footing 10 side, and the deformation stopper member 15 is attached to the rising wall 8 side. It is done. Then, the clearance distance a is provided between the energy absorbing member 14 and the deformation stopper member 15 and the configuration of the energy absorbing member 14 is the same as that of the first embodiment. Therefore, the deformation stopper member 15 attached to the rising wall 8 side has a flat plate shape, and the impact force received as a bearing plate is evenly transmitted to the concrete rising wall 8 so as not to damage the concrete wall. There is a difference in that it can be attached to the rising wall 8 without forming a recess. According to this embodiment, since it is not necessary to make the concrete rising wall 8 thick, it can be applied to a conventional wall, and in particular, can easily cope with reinforcement of an existing seismic isolation building.

  However, as shown in FIG. 8, with respect to the operation of the deformation control device 13, the seismic isolation device 3 can sufficiently absorb the seismic energy within the designed earthquake range, but when an earthquake exceeding that occurs, Before the limit of the seismic isolation device 3 is exceeded, the deformation stopper member 15 comes into contact with the energy absorbing member 14 to absorb the seismic energy by elastic deformation of the energy absorbing member 14 so that the limit of the seismic isolation device 3 is not exceeded. -ing After the earthquake, the deformation control device 13 is restored to the original state together with the seismic isolation device 3. Further, when a huge earthquake more than expected in design occurs, the deformation stopper member 15 presses the energy absorbing member 14 and the energy absorbing member 14 is crushed to absorb the seismic energy, and the seismic isolation device 3 is excessive. It is the same as that of the first embodiment in that it is not deformed or damaged, so that the elastic rubber 18 of the energy absorbing member 14 is sequentially crushed in place of the seismic isolation device 3 to absorb energy and deform. This is also the same in that the seismic isolation device 3 is prevented from being damaged.

  Also in this second embodiment, other examples are shown in FIGS. 9 and 10. FIG. Also in this example, in the same manner as the other examples according to the first embodiment, in the deformation control device 13 installed in the clearance A, for example, falling objects such as stones and mud from the outside, and rats It is desirable to protect the deformation control device 13 by attaching a resin bellows-like cover 20 so that small animals do not enter. By attaching the cover in this way, it is the same in that the deformation control device 13 always functions normally in any case.

Furthermore, FIGS. 11-12 is demonstrated about the seismic isolation building structure which concerns on 3rd Embodiment.
The seismic isolation building structure differs from the seismic isolation building structures according to the first and second embodiments in that a laminated rubber seismic isolation device 3 and a sliding seismic isolation device 3a are used as seismic isolation devices. A deformation control device 13 installed in the clearance A of the outer peripheral surface of the base isolation building described in the first and second embodiments as a deformation control device used in combination with the base isolation building, The only difference is that the deformation control device 13a installed on the bit B formed between the large beam (underground beam) 11 of the superstructure 2 of the earthquake building and the mat slab 7 of the foundation structure 1 is used together. Since the components are substantially the same, the same reference numerals are given and the detailed description thereof will be omitted.

  As shown in FIGS. 11 and 12, the seismic isolation building structure 21 includes a pillar 9 and a large beam 11 as an example, and the foundation part (foundation structure 1) and the building (upper structure 2) The seismic isolation device 3 is attached between the base 10 of the wrinkle provided on the head of the pile 5 and the footing 10 to which the pillar 9 is attached. In this embodiment, the seismic isolation device 3 disposed between the pile base 6 of the pile head located on the outer side of the building and the footing 10 is a laminated rubber type, for example, a laminated structure including a lead plug. It is a rubber isolator (black circle display) and is a slip-type seismic isolation device 3a between a pile foundation 6 and a footing 10 located on the inside from the outside of the building, for example, a rigid slide support (white circle display) In short, this is the seismic isolation building structure 21 in which the laminated rubber seismic isolation device 3 and the sliding seismic isolation device 3a are used together in a required pattern. However, the arrangement pattern of the seismic isolation devices 3 and 3a is merely an example, and the arrangement pattern of the laminated rubber-based seismic isolation device 3 and the sliding-type seismic isolation device 3a is not limited to this. Instead, the number may be increased or decreased as necessary.

In this way, by using the seismic isolation device 3 and the sliding seismic isolation device 3a in combination, the sliding support by the sliding seismic isolation device 3a cannot suppress the horizontal displacement of the building. Not only will the bearing be damaged by excessive deformation exceeding the allowable horizontal deformation, but there is also the risk that the building will slip too much and fall. Therefore, it is formed between the deformation control device 13 installed in the clearance A on the outer peripheral surface of the base-isolated building, the large beam (underground beam) 11 of the superstructure 2 of the base-isolated building and the mat slab 7 of the foundation structure 1. The deformation control device 13a installed in the bit B is used together. The deformation control device 13a is installed on the inner side of the outer periphery, for example, on the inner beam 11 in the long side direction of the building. On the other hand, it is attached every other, and in the short side direction, it is attached in an adjacent state. In addition, although illustration is abbreviate | omitted, 1st invention concerning this invention installs the deformation | transformation control apparatus 13 only in the clearance A in the outer peripheral part of a building, and 2nd invention is the inside of a seismic isolation building. The deformation control device 13a is installed only in the bit B.
Therefore, it is desirable that the arrangement of the deformation control devices 13 and 13a appropriately correspond to the shape and height of the base isolation building, the structure type, the type of the base isolation device, and the like. For example, in the case of a general seismic isolation building, the deformation control device 13 can be arranged only on the outer peripheral surface as in the first invention. When reinforcing an existing base-isolated building, if there is a restriction on the existing clearance A on the outer peripheral surface and the installation of the deformation control device 13 is difficult, the interior of the base-isolated building is as in the second invention. Only the deformation control device 13a can be installed. Further, in the case of a large-scale seismic isolation building, it is preferable to cope with the first invention and the second invention in combination as shown in FIGS.

Next, a specific configuration of the deformation control device 13a attached to the large beam 11 will be described.
As shown in FIG. 13, the deformation control device 13a is installed in a bit B formed between a large beam (underground beam) 11 of the upper structure 2 and a mat slab 7 of the foundation structure 1, The deformation control device 13a includes two energy absorbing members 14a and one deformation stopper member 15a, and the deformation stopper member 15a includes a contact portion 15b that contacts the energy absorbing member 14a. The steel plate is welded to a steel pipe and has a metal bar shape on both sides, and is attached to a substantially central portion of the large beam 11 via a mounting plate 15d formed integrally with the arm portion 15c. The energy absorbing member 14a is attached to the mat slab 7 via the support member 14b at a predetermined interval on both sides of the member 15a, that is, on the contact portion 15b side. It is intended to be disposed attached by 2.

  As shown in FIG. 14, the seismic energy can be sufficiently absorbed by the seismic isolation device 3 within the designed earthquake range. However, when an earthquake exceeding that occurs, the limit of the seismic isolation device 3 is exceeded. Before, one of the energy absorbing members 14a comes into contact with one of the deformation stopper members 15a so as not to exceed the limit of the seismic isolation device 3. After the earthquake, the deformation control device 13a is restored to the original state together with the seismic isolation device 3. Further, when a huge earthquake more than expected in design occurs, the deformation stopper member 15a presses the energy absorbing member 14a, and the energy absorbing member 14a is crushed to absorb the seismic energy, so that the seismic isolation device 3 is excessive. It is the same in that it is prevented from being deformed and broken, whereby the elastic rubber constituting the energy absorbing member 14a is crushed in place of the seismic isolation device 3 to absorb the energy and suppress the deformation. It is the same also in the point which prevents damage of.

  As shown in FIG. 15, the deformation stopper member 15a in this case has a generally metal hook shape, and the contact portions 15b on both sides thereof are attached by welding circular plates to both ends of the steel pipe. However, it may be a rectangular or polygonal plate. Further, the arm portion 15c is formed of a rigid plate, and a mounting plate 15d is integrally attached to the arm portion 15c by welding means or the like, and a plurality of bolts and nuts 23 are provided via the mounting plate 15d. Can be attached firmly.

Further, as shown in FIG. 16, the energy absorbing member 14a has a multistage structure of two or more stages of the plate 17 and the elastic body 18, as in the first embodiment. It is a metal, and the elastic body is, for example, a material selected from natural rubber, synthetic rubber, high damping rubber, or low rebound elastic rubber, etc., and a viscoelastic body can be used instead of the elastic body, The viscoelastic body is appropriately selected from, for example, a low resilience material or a silicone resin, and is not particularly limited, and is substantially the same as the first embodiment. Can be used. And it is the same also about the performance of the elastic body or viscoelastic body, and since the description overlaps, it abbreviate | omits. It is to be noted that the energy absorbing member 14a is disposed with a predetermined interval with respect to the deformation stopper member 15a, and the required interval is to be installed with the play distance a described in the first embodiment.
Further, as shown in FIG. 17, a resin bellows-like cover 20 is attached between the energy absorbing member 14a and the deformation stopper member 15a in the same manner as in the first embodiment, so that the deformation control device 13a is installed. It is desirable to protect.

  The deformation control device 13a according to the third embodiment is composed of two energy absorbing members 14a and one deformation stopper member 15a. FIG. 18 and FIG. A two-to-one set of deformation control devices 13a including two energy absorbing members 14a and two deformation stopper members 15a each paired with the energy absorbing member 14a shown in FIG. 19 will be described.

  First, as shown in FIG. 18, the two-to-one set of deformation control devices 13 a is applied to the bit B formed between the large beam (underground beam) 11 of the upper structure 2 and the mat slab 7 of the foundation structure 1. The configurations of the energy absorbing member 14a and the deformation stopper member 15a, which are installed and each pair, are substantially the same as those of the third embodiment. As for attachment, one set is attached to both ends of the large beam 11 one by one. That is, the deformation stopper member 15a is attached to the both ends of the large beam 11 by the bolts and nuts 23 via the attachment plate 15d, and the energy absorbing member 14a has a required clearance distance a from the contact portion 15b of the stopper member 15a. The mat slab 7 is attached to the mat slab 7 with bolts and nuts 22 or the like via the support members 14b. In this case, the energy absorbing members 14a to be attached are all close to the buckle base 6, and are attached in the direction in which both face each other.

  As shown in FIG. 19, the two-to-one set of deformation control devices 13a attached in this way can sufficiently absorb the earthquake energy by the seismic isolation device 3 within the designed earthquake range. When a huge earthquake is generated, one energy absorbing member 14a abuts against the abutting portion 15b of one deformation stopper member 15a, and the energy absorbing member 14a is crushed to absorb seismic energy. This is the same in that the limit of the seismic isolation device 3 is not exceeded, so that the elastic rubber constituting the energy absorbing member 14a is crushed in place of the seismic isolation device 3 to absorb the energy, and excessive deformation of the seismic isolation device 3 is suppressed. This also applies to the point of preventing damage.

In addition, since the deformation control devices 13 and 13a of the present invention can obtain a vibration control (vibration) effect as well as a displacement control effect, they can also be used as a vibration control (vibration) damper. For example, by using a viscoelastic material for the energy absorbing member, the gap distance a can be reduced by increasing the number of steps n, and the gap distance a is 70% of the allowable deformation capacity (maximum allowable deformation value) of the seismic isolation device. By setting within the range, the vibration control (vibration) effect of the deformation control device can be enhanced. Furthermore, the deformation control device can be used as a vibration damping (vibration) damper by appropriately adjusting and combining the material used for the elastic (viscous) body 18 and the number of steps n, and setting the gap distance a to zero. Therefore, it is cheaper than the conventional expensive vibration control (vibration) damper, and the cost can be reduced. In addition, when using it also as a vibration control (vibration) damper, it is most preferable to set the gap distance a within a range of 10 to 70% of the allowable deformation capacity (maximum allowable deformation value) of the seismic isolation device.
About the foundation structure 1, although shown as the pile foundation 5 in an Example, it is good also as an independent foundation, a cloth foundation, etc., without limiting to this.
The upper structure 2 is not particularly limited, and may be any of RC, PC, S, or SRC.
The embodiment described above is not intended to limit the structural requirements (main point) of the present invention, and various modifications can be made without departing from the spirit of the present invention.

  The seismic isolation structure according to the present invention is a seismic isolation structure 21 in which a seismic isolation device 3 is installed between the base structure 1 and the upper structure 2, and the outer peripheral rising wall 8 of the base isolation building structure. A clearance A is formed between the base structure 1 and the upper structure 2 of the base-isolated building, and a pit B is formed between the foundation structure 1 and the upper structure 2. Or a deformation control device 13a is provided at a required location of the bit B. The deformation control device is composed of energy absorbing members 14, 14a and deformation stopper members 15, 15a, and is within the designed earthquake range. Then, although the seismic energy can be sufficiently absorbed by the seismic isolation device 3, the deformation stoppers 15 and 15a absorb the energy before the limit of the seismic isolation device 3 is exceeded when an earthquake exceeding the seismic energy occurs. Pressed in contact with the wood 14, 14a, and seismic energy absorbed by the elastic deformation of the energy absorbing member 14, 14a, it is the seismic isolator 3 is not exceed the limit. After the earthquake, the deformation control devices 13 and 13a are restored to the original state together with the seismic isolation device 3. Further, when a huge earthquake more than expected in design occurs, the deformation stopper members 15 and 15a press against the energy absorbing members 14 and 14a, and the energy absorbing members 14 and 14a are crushed to reduce the earthquake energy. It absorbs and acts so that the seismic isolation device 3 is not excessively deformed and broken, and thereby, instead of the seismic isolation device 3, the elastic rubber 18 of the energy absorbing members 14, 14 a is sequentially crushed to absorb energy. Suppress deformation, prevent damage to the seismic isolation device 3, and the seismic isolation device 3 will be restored to its original state after the earthquake, so even if it encounters a major earthquake, it can be maintained without losing the seismic isolation function as a structure. In addition, since the deformation control devices 13 and 13a can be easily replaced or newly installed at any time, in a newly built or existing seismic isolation structure of this type Ku can be used.

DESCRIPTION OF SYMBOLS 1 Foundation structure 2 Superstructure 3 Laminated rubber type seismic isolation device 3a Sliding type seismic isolation device 4 Ground 5 Pile 6 Wrap base 7 Mat slab 8 Standing wall 9 Column 10 Footing 11 Large beam 12 Slab 13, 13a Deformation control device 14, 14a Energy absorbing member 14b Support member 15, 15a Deformation stopper member 15b Contact portion 15c Arm portion 15d Mounting plate 16 Recess 17 Plate 18 Elastic body or viscoelastic body 19 Lid member 20 Resin bellows-shaped cover 21 Seismic isolation building structure 22, 23 Bolt nut A Clearance
B bit a Distance between play

Claims (5)

A base-isolated building structure in which a base isolation device is interposed between the foundation structure and the superstructure,
A clearance is formed between the outer peripheral rising wall of the seismic isolation building structure and the upper structural frame of the base isolation building, and a pit is formed between the foundation structure and the upper structure,
A deformation control device comprising an energy absorbing member and a deformation stopper member installed at a required position of the clearance with a required clearance is provided,
The required clearance is set so that the deformation stopper member comes into contact with the energy absorbing member and starts elastic deformation control in accordance with 70 to 80% of the deformation limit allowable value of the seismic isolation device,
A base-isolated building structure in which the energy absorbing member is elastically deformed to absorb seismic energy so as not to exceed a deformation limit allowable value of the base isolation device . A base-isolated building structure in which a base isolation device is interposed between the foundation structure and the superstructure,
A clearance is formed between the outer peripheral rising wall of the seismic isolation building structure and the upper structural frame of the base isolation building, and a pit is formed between the foundation structure and the upper structure,
A deformation control device comprising an energy absorbing member and a deformation stopper member installed at a required portion of the pit with a required clearance is provided,
The required clearance is set so that the deformation stopper member comes into contact with the energy absorbing member and starts elastic deformation control in accordance with 70 to 80% of the deformation limit allowable value of the seismic isolation device,
The base-isolated building structure, wherein the energy absorbing member is elastically deformed to absorb seismic energy so as not to exceed a deformation limit allowable value of the base isolation device. 3. The base-isolated building structure according to claim 1, wherein the energy absorbing member has a multistage structure, and each stage includes an elastic body or a viscoelastic body and a plate. 4. The base-isolated building according to claim 3, wherein the spring coefficient of the elastic body at each stage is different and is increased in order from the surface to the mounting portion, and the order of the sizes is as follows. Construction.
K2 = α2 ・ K1,
K3 = α3 · K2, ...
Kn = αn · K (n−1)
K1, K2, K3,... Kn: Spring coefficient of each stage of the elastic body in order from the surface α2, α3, ... αn: Extra coefficient of each stage
1 <α2, α3, ... ・ αn <10
n: Number of stages The base-isolated building structure according to claim 4, wherein the elastic body has a spring coefficient characteristic of either a linear spring or a non-linear spring.

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