JPH01203541A - Earthquake proof structure supporting method of building and its supporting device - Google Patents

Abstract

PURPOSE:To promote an earthquake resisting performance by providing collapsing prevention laminated rubber substances facing downward to positions generating negative shaft power when earthquake input against a building supported by long time-usage laminated rubber substances under load is received. CONSTITUTION:A building 2 is supported on a foundation slal 8 by long-time loaded laminated rubber substances 1 made by laminating and adhering thin metal plates and rubber sheets alternately. Collapsing prevention laminated rubber substances 3 are provided facing downward to positions of the building 2 generating negative shaft power when earthquake input is received. The laminated rubber substance 3 has the same construction as that of the laminated rubber substance 1, and the negative shaft power does not affect the laminated rubber substance 1 by the installation of the laminated rubber substance 3. According to the constitution, in case of an earthquake, the negative shaft power which has been supported by the laminated rubber substances 3 is transmitted to the ground through earth anchors 4, so that the building 2 having a larger aspect ratio can also be treated as the object of an earthquake resisting construction using the laminated rubber substance 1.

Description

Detailed Description of the Invention: Industrial Field of Application This invention relates to seismic isolation support implemented in medium-rise buildings, particularly flat-shaped or tower-shaped buildings with a large height-to-width ratio (aspect ratio). The present invention relates to a method and a seismic isolation support device.

Conventional technology The principle of recent seismic isolation support methods and devices for buildings is to support the building on the ground with a laminated rubber body made by stacking a large number of thin metal plates and rubber sheets alternately, and to maintain the horizontal position of the laminated rubber body. It is common to use soft deformation performance to prevent earthquake forces from being transmitted to the building as much as possible, and to lengthen the vibration period to obtain a seismic isolation effect. Of course, it is also natural to incorporate a damper to suppress the amount of horizontal movement of the building as much as possible (for example, Japanese Patent Application Laid-Open No. 168875
(Refer to the seismic isolation support method and seismic isolation support device for buildings described in the publication).

The laminated rubber body has the characteristic that it hardly deforms under axial compressive force, and can support the large long-term vertical loads of buildings, and its greatest feature is that it can be deformed softly in the horizontal direction. .

Therefore, as shown in Fig. 8A, when a general low-rise building C is supported on a foundation plate a through a laminated rubber body b..., when subjected to an earthquake force, the structure shown in Fig. 8B As such, it is an extremely excellent seismic isolation support method and device for buildings that simply move rigidly horizontally and are hardly affected by overturning moments.

Problems to be Solved by the Present Invention By the way, a laminated rubber body exhibits a characteristic elongation of the rubber material in response to a tensile force, and easily deforms several tens of times in response to a tensile force of the same magnitude as a compressive force. There are drawbacks that occur.

On the other hand, recently, due to site restrictions, many tall, slender, tower-shaped buildings, or flat-shaped buildings whose short side width is limited to a certain limit, such as apartment complexes, have appeared. A building C' with a large height to width ratio (aspect ratio), such as a tower-shaped or flat-shaped building, is designated as the ninth building.
When the building C' is supported by a laminated rubber body b...on top of the foundation plate a as shown in Figure A, when subjected to an earthquake force, the building C' moves horizontally as shown in Figure 9B, and at the same time is subject to a large overturning moment. Rotational motion acts, and in some cases, negative axial force is generated, which may cause tensile force to act on the laminated rubber body.

For this reason, until now, tower-shaped or flat-shaped buildings have been excluded from the scope of seismic isolation support methods and seismic isolation support devices for buildings using laminated rubber bodies, and this point has become an issue that needs to be resolved. There is.

Therefore, an object of the present invention is to provide a seismic isolation support method and a seismic isolation support device that are effective for tower-shaped or flat-shaped buildings using laminated rubber bodies.

Means for Solving the Problems (No. 1. Second Invention) As a means for solving the problems of the above-mentioned prior art, there is provided a seismic isolation support method for a building according to the present invention, the basic conceptual diagram of which is shown in Fig. 1. , as preferred embodiments are shown in FIGS. 2 to 7, the building 2 is supported on the ground 5 by a laminated rubber body l formed by stacking a large number of thin metal plates and rubber sheets alternately. In the seismic isolation support method of buildings.

A laminated rubber body 3 for fall prevention is installed facing downward in a part of the building 2 that receives an earthquake input where a negative axial force is likely to be generated to bear the negative axial force, thereby supporting the building 2 under long-term loads. It is characterized in that no negative axial force acts on the laminated rubber body l.

In addition, in the above-mentioned seismic isolation support method for buildings, the negative axial force borne by the laminated rubber body 3 for fall prevention is
The structure is such that the reaction force is taken and processed.

When building 2, which has a large operational aspect ratio, receives an earthquake input and a negative axial force is generated due to the rotational movement due to the overturning moment (see Figure 9B), the building 2, which has a large aspect ratio, is subjected to a negative axial force. 3 receives and bears the burden, and the reaction force is taken to the ground 515 through the earth anchor 4 and disposed of.

The laminated rubber body 3 for fall prevention also has the feature of hardly deforming due to compressive force, so the negative axial force is reliably received as a compressive force, and the laminated rubber body 1 for long-term vertical loads does not receive tensile force. Don't let it work at all.

On the other hand, the horizontal movement of the building 2 is made possible by the flexible deformation of each laminated rubber body 1.3.

(Third to Fifth Inventions) As a means for solving the same problem as above, a seismic isolation support device for a building according to the present invention is shown in a conceptual diagram in FIG. 1, and in FIGS. 2 to 7. As shown in the preferred embodiment, in a seismic isolation support device for a building in which the building 2 is supported on the ground 51iS by a laminated rubber body l... made by stacking a large number of thin metal plates and rubber sheets alternately, A U-shaped transmission frame 7 is fixed to the lower surface of the upper floor plate 6 of the building 2 at a location where negative axial force is likely to occur in the building 2 that receives an earthquake input, and a U-shaped transmission frame 7 is fixed to the base plate 8 within the transmission frame 7. An inverted U-shaped reaction frame 9, which is crossed like a chino, is fixed therethrough.

A laminated rubber body 3 for fall prevention is installed vertically downward between both frames 7 and 9, that is, in a manner to absorb the negative axial force generated in the building 2, and the reaction frame 9 is tightly connected to the earth anchor 4. It has a fixed configuration.

Alternatively, both legs 9a of an inverted U-shaped reaction force frame 9' fixed to the foundation plate 8 are installed in the parts of the building 2 that are subject to earthquake input where negative axial force is likely to occur.

9a is installed through the opening 10 provided in the upper floor plate 6 of the building 2, and the laminated rubber body 3 for fall prevention is placed vertically downward between the upper side 9b of the same pressure frame 9' and the upper floor plate 6. installed,
The reaction frame 9' is tightly connected and fixed to the earth anchor 4.

In addition, in the above seismic isolation support device, the inverted U-shaped reaction force frame 9' is installed so as to cross over the upper floor beam 11 of the upper floor board 6, and The laminated rubber body 3 is installed vertically downward between the position and the reaction force frame 9'.

When a negative axial force due to an overturning moment occurs in the building 2 that has received an earthquake input, this negative axial force is transmitted as a compressive force to the laminated rubber body 3 for overturning prevention through the transmission frame 7 or the upper floor board 6. I can accept it. Then, the negative shaft cover reaction force received by the laminated rubber body 3 is transmitted from the frame 9 or 9' to the ground fi 5 through the earth anchor 4 and processed, and no tensile force is applied to the laminated rubber body l that supports the long-term vertical load. Don't let it work.

On the other hand, horizontal movement of the building 2 in response to earthquake input is made possible by the flexible horizontal deformation performance of each of the laminated rubber bodies 1 and 3. In addition, the loose flexibility of the U-shaped transmission frame 7 and the reaction force frame 9 crossed in a chain shape, or the upper floor plate 6 to allow the reaction force frame 9' and its legs 9a, 9a to pass through. The horizontal movement of the building 2 is made possible within the range of play provided by the opening lO.

Note that the negative axial force generated in the building 2 is applied to the laminated rubber body 3 for preventing falling at the position of the upper floor beam (girder) 11 of the upper floor board 6.
If you create a configuration that transmits this, it becomes mechanically clear.

Example Next, the embodiment shown in the drawings will be explained.

First, the seismic isolation support method and the seismic isolation support device for buildings shown in Figs. A large number of laminated rubber bodies 1 are stacked vertically upward, and a building 2 with a large aspect ratio of 7 is constructed on top of it, with floor beams (
The part of girder) 11 is the laminated rubber body 1 for long-term vertical load.
Supported by

In the building 2, which has a large aspect ratio, first install reinforced concrete or steel structure U on the underside of the upper floor plate 6 of the building 2 in areas where negative axial force is likely to occur when receiving earthquake input (see Figure 9B). A transmission frame 7 having a shape is mounted and fixed, and on a base plate 8 is an inverted U shape that is approximately the same shape as the transmission frame 7, and is crossed and connected in a chain shape through an arrangement perpendicular to the transmission frame 7. The reaction force frame 9 is fixedly mounted. At the intersection of the frames 7 and 9, a stacked rubber body 3 for preventing falling, which is also made of a large number of thin iron plates and rubber sheets stacked alternately, is installed vertically downward.

The lower ends of both legs of the reaction frame 9 are each tightly connected and fixed to the head of the earth anchor 4.4 on the base plate 8.

Although not shown in the diagram, there is a damping device (gumper) between the upper floor plate 6 and the foundation plate 8 of the building 2 that suppresses the horizontal movement of the building 2 when it receives an earthquake force. It is installed as an essential element.

Therefore, the entire weight of the building 2 during normal times is supported by the laminated rubber body 3 for long-term vertical loads.

On the other hand, when the building 2 receives an earthquake input and has a large aspect ratio, it not only moves horizontally with the deformation of the two types of laminated rubber bodies 1 and 3, but also moves negatively due to the rotational movement caused by the overturning moment. When axial force is generated (see Figure 9B), the axial force of the chain member is transmitted from the transmission frame 7 foamed to the upper floor board 6 of the building 2 as a compressive force to the laminated rubber body 3 for fall prevention. , all of the load is placed on the laminated rubber body 3, so that negative axial force (tensile force) is never generated in the laminated rubber body l for long-term loads. Laminated rubber body 3 for fall prevention
The negative axial force received is transmitted from the reaction frame 9 to the ground 5 through the earth anchor 4 and processed. By the way, each earth anchor 4 generally has a tensile strength of 100 tons or more, so the negative axial force that can be received by the laminated rubber 3 for fall prevention can be borne and handled with sufficient margin. It is.

Therefore, even a building 2 with a large aspect ratio that is likely to generate negative axial force when receiving an earthquake input can be safely constructed as a seismically isolated building.

The laminated rubber body 3 for fall prevention does not bear any weight of the building 2, so as long as its horizontal deformation ability can follow the laminated rubber body 1 for long-term loads, a compact structure can be achieved by using a small capacity one. It can be implemented.

Second Embodiment Next, the seismic isolation support method and the seismic isolation support device shown in FIGS. ... is installed vertically upward, building 2 with a large 7 aspect ratio is constructed on top of it, and the floor beam (
The part of girder) 11 is the laminated rubber body 1 for long-term vertical load.
Supported by

In the building 2, which has a large aspect ratio, in areas where negative axial force is likely to occur when receiving earthquake input (see Fig. 9B), an inverted U-shape is first constructed of reinforced concrete or steel structure on the foundation plate 8. The reaction force frame 9' is fixedly mounted. On the other hand, an opening 1O1 is provided in the upper floor plate 6 of the building 2, which is large enough to allow the building 2 to move horizontally during an earthquake.
lO is provided, and both legs 9a, 9a of the reaction force frame 9'
are raised up through substantially the center of the opening 1O110, respectively, so that the upper side 9b of the isostatic force frame 9' intersects with the upper floor beam (girder) 11 of the upper floor board 6. A laminated rubber body 3 for preventing falling is installed vertically downward between the upper floor beam 11 of the upper floor board 6 and the upper side 9b of the reaction frame 9', and prevents the negative axial force generated in the building 2 from falling. The lower ends of both legs of the zero reaction force frame 9', which is configured to receive the compressive force, are tightly connected and fixed to the head of the earth anchor 4 on the base plate 8.

Note that although illustration is omitted in the case of this embodiment as well,
Between the upper floor plate 6 and the foundation plate 8 of the building 2, there is a damping device (
damper) is installed.

Therefore, in the case of this embodiment as well, the entire weight of the building 2 during normal operation is supported by the laminated rubber body 3 for long-term vertical loads.

On the other hand, when the building 2 receives an earthquake input and has a large aspect ratio, it not only moves horizontally with the deformation of the two types of laminated rubber bodies 1 and 3, but also moves negatively due to the rotational movement caused by the overturning moment. When an axial force is generated (see Fig. 9B), the axial force of the chain member is transmitted as a compressive force from the upper floor plate 6 of the building 2 to the laminated rubber body 3 for fall prevention, and all of the force is transmitted to the laminated rubber body 3 for preventing falling. This process is carried out so that no negative axial force (tensile force) is generated in the laminated rubber body l for long-term loads. The negative axial force received by the laminated rubber body 3 for fall prevention is 1
From the opposite frame 9' to the ground 5 through the earth anchor 4
The information is transmitted to and processed.

As described in detail in conjunction with the embodiments, the effects of the present invention are as follows.According to the seismic isolation support method and seismic isolation support device for a building according to the present invention, when receiving an earthquake input, negative axial force is The building 2, which has a large aspect ratio that is likely to cause damage, is also a target of a seismic isolation structure using the laminated rubber body 1, and can be made into a highly reliable and safe seismic isolation building.

Moreover, since the laminated rubber body 3 for fall prevention does not bear any weight of the building 2, it can be made compact by using a small capacity one as long as its horizontal deformation ability can follow the laminated rubber body 1 for long-term loads. It can be implemented economically due to its structure.

[Brief explanation of the drawing]

Fig. 1 is an implementation conceptual diagram of the seismic isolation support method and seismic isolation support device for buildings according to the present invention, and Fig. 2 to 4 are the first embodiment of the present invention.
The main parts of the embodiment are shown, and FIGS. 2 and 3 are sectional views taken along the arrows ■-■ and mm in FIG. 4, and FIG.
The rV arrow-view plan view and FIGS. 5 to 7 show the main parts of the second embodiment of the present invention, and FIGS. 5 and 6 are taken along V-V in FIG. 7. Vl-VI arrow sectional view, Fig. 7 is a plan view of Fig. 6, Fig. 8
Figures A and B and Figures 9A and 9B are conceptual diagrams showing the fluctuation states of conventional seismic isolation support methods and seismic isolation support devices for low-rise buildings and buildings with large aspect ratios in normal times and during earthquakes, respectively. 2... Building l... Laminated rubber body 3 for long-term loads
... Laminated rubber body for fall prevention 4 ... Earth anchor 6 ... Upper floor board 7 ...
Transmission frame 8...Foundation plate 9.9'...Reaction frame 10...Opening 11...Upper floor beam Figure 2, Figure 3, Figure 4, Figure 5, Figure 6

Claims (1)

[Scope of Claims] [1] In a seismic isolation support method for a building in which the building is supported on the ground by a laminated rubber body made by stacking a large number of thin metal plates and rubber sheets alternately, the building is subject to earthquake input. In order to prevent negative axial force from acting on the laminated rubber body for long-term loads, a laminated rubber body for fall prevention is installed facing downward in the area where negative axial force is likely to be generated to bear the negative axial force. A seismic isolation support method for a building characterized by: [2] The seismic isolation support method for a building according to claim 1, characterized in that the negative axial force received by the laminated rubber body for fall prevention is dealt with by taking a reaction force to an earth anchor. . [3] In a seismic isolation support device for a building that supports a building on the ground using a laminated rubber body made by stacking a large number of thin metal plates and rubber sheets alternately, negative axial force is applied to the building when it receives earthquake input. In areas where this is likely to occur, a ■-shaped transmission frame is fixed to the underside of the upper floorboard of the building, and an inverted ■-shaped reaction frame that passes through the transmission frame and intersects is fixed to the foundation plate. 1. A seismic isolation support device for a building, characterized in that a laminated rubber body for fall prevention is installed vertically downward between them, and the reaction frame is tightly connected and fixed to an earth anchor. [4] Negative axial force is generated in buildings that receive earthquake input in seismic isolation support devices for buildings that support buildings on the ground using laminated rubber bodies made by stacking many thin metals and rubber sheets alternately. In areas that are likely to be damaged, both legs of an inverted-shaped reaction frame fixed to the foundation slab are passed through openings in the upper floor of the building, and the reaction frame is installed in a manner that intersects with the upper floor of the building. , a laminated rubber body for fall prevention is installed vertically downward between the upper side of the reaction frame and the upper floor board, and the reaction frame is tightly connected and fixed to an earth anchor. Seismic isolation support device for buildings. [5] The inverted ■-shaped reaction frame is installed to straddle the upper floor beam of the upper floor plate, and a laminated rubber body is installed vertically downward between the position above the upper floor beam of the upper floor plate and the reaction frame. A seismic isolation support device for a building as set forth in claim 4.