JPH09302681A - Building structure with vibration control mechanism - Google Patents

Abstract

(57) [Abstract] [Problem] When a building structure is present on soft ground, the conventional seismic isolation mechanism using laminated rubber has a small damping effect, and the development of a new damping structure has been desired. . SOLUTION: A foundation 13 of a building structure 11 to a soft ground 1
Anchor 1 in the direction inclining to the vertical line in 2
A seismic control body composed of 6a, 16b or piles 21a, 21b is driven in, and the seismic control body restrains the displacement of the upper structure 19 in the building structure 11 in one horizontal direction. It is characterized by comprising at least a pair of damping bodies including a body and a second damping body that restrains horizontal displacement of the upper structure in a direction different from the one direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building structure provided with a vibration control mechanism, which is particularly constructed on soft ground.

[0002]

2. Description of the Related Art As is well known, there is a seismic isolation method as a method for reducing the shaking of a building structure during an earthquake. FIG. 4 is a conceptual diagram showing the principle of a conventional general seismic isolation construction method. In the figure, reference numeral 1 is an upper building structure, 3 is an isolated floor, and 5 is a laminated rubber. This building structure 1 extends the natural period by a seismic isolation device made of laminated rubber 5 with low horizontal rigidity installed under each column on the seismic isolation floor 3 and adds damping to provide a vibration response as a whole. It will be reduced.

[0003]

However, the seismic isolation method as described above is used in the case where long-period components are predominantly input to a building during an earthquake, such as soft ground or ground that causes liquefaction. Not suitable. Further, when the laminated rubber is used, horizontal displacement is usually about 50 cm, so that there is a problem that a clearance and a seismic isolation pit floor corresponding to the horizontal displacement are required. Therefore, in the case of a building structure on soft ground, it has been desired to propose a new vibration control mechanism corresponding to it.

By the way, the fact that the ground is soft means that the ground has a low-pass filter effect that short-period components of seismic waves are cut between the foundation and the surface of the earth. It can be regarded as a seismic device. However, the active use of soft ground as a seismic isolation effect has not yet been put to practical use because it is difficult to incorporate a damping mechanism.

All of the conventional seismic control methods aim to reduce the response at the time of earthquake by incorporating a device (apparatus) for absorbing energy in the frame of the upper structure as described above. Those who tried to reduce the response by modifying the lower part had a seismic isolation construction method in which a base isolation floor was formed under the foundation and an isolator such as laminated rubber was bitten. The present invention, in contrast to the conventional seismic isolation construction method using laminated rubber,
In particular, the present invention proposes a building structure having a new damping mechanism that solves the problems peculiar to the building structure built on soft ground.

[0006]

In order to solve the above problems, the new vibration control mechanism of the present invention employs the following means. In the building structure provided with the damping mechanism according to claim 1, a damping body composed of anchors or piles is driven from the foundation of the building structure into the ground in a direction inclined with respect to the vertical line. . The damping body restrains a first damping body that restrains a displacement of the upper structure in the building structure in one direction in the horizontal direction, and restrains a horizontal displacement of the upper structure in a direction different from the one direction. It comprises at least a pair of seismic controls including a second seismic control. In this building structure, at least a pair of seismic control bodies function as a seismic control mechanism during an earthquake to reduce the seismic input to the building structure.

According to a second aspect of the present invention, there is provided a building structure having the vibration control mechanism according to the first aspect, wherein in the building structure having the vibration control mechanism according to the first aspect, an upper end portion of the vibration control body is attached to the foundation through a damper. Have been contacted. In this building structure, in addition to the damping mechanism of the damping body itself, the damper reduces the vibration response value.

According to a third aspect of the present invention, there is provided a building structure including the vibration control mechanism according to the first or second aspect, wherein the vibration control body is a plan view of the foundation. Within the contour (when viewed from above) it is driven from inside to outside of the contour. In this building structure, the damping body exerts the damping function just below the building structure.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention, in which a building structure denoted by reference numeral 11 is constructed on a soft ground 12.

The foundation 13 of the building structure 11 is provided with a predetermined depth of penetration from the surface 14, and a pile 15 is driven into the ground 12 below the foundation 13. Here, in FIG. 1, the pile is a projecting pile in order to prevent an earthquake input from the ground to the foundation root. The pile 15 has the upper end fixed (joined) to the foundation 13 and the foundation 1
It is placed from 3 in the vertical direction.

In the ground 12 below the foundation 13,
Anchors 16a, 1 oriented in a direction inclined with respect to the vertical line
6b is driven in. Pair of anchors 16a, 16
b are connected and integrated at their upper ends. At the upper end, the anchor is connected to the foundation 13 via dampers 17a and 17b, and at a portion located in the ground, the anchor is embedded in the ground 12 in an unbonded state using a sheath pipe 18a. The anchor 16 in the foundation 13 is arranged in the steel pipe embedded in the foundation 13. At this time, the bending points of 16a, 16b, 16c can be displaced by sliding the anchors 16a, 16b, 16c. These anchors 16a and 16b are used for the foundation 13 to the soft ground 12
It is driven so as to reach the supporting ground (not shown) through the above, and the lower end portions thereof are fixed (anchor) to the supporting ground.

One anchor 16a and the other anchor 1
6b is located so as to extend from the edges of the contour of the foundation 13 in the direction away from the foundation 13, that is, in the opposite direction when seen in a plan view. As the anchors 16a and 16b, a pair of anchors 16a and 16b, which extend in opposite directions when viewed in a plane as described above, are provided in appropriate places, though not shown.

These anchors 16a and 16b constitute a vibration control body which exerts a vibration control function when an earthquake occurs, as will be described later, and the anchors 16a and 16b are connected together at their upper ends to form a damper. A vibration control body that suppresses horizontal vibration of the building structure 11 with respect to the upper structure 19 is configured.

In the building structure 11 having the above structure, the anchors 16a and 16b function as a vibration control mechanism when an earthquake occurs, and the upper structure portion 19 of the building structure 11 is constructed.
Reduce seismic input to. In this case, the vibration is the ground 12
Is a soft ground, short-period components are cut from the supporting ground to the ground surface 14, and long-period components are mainly ground surface 14.
Is transmitted to Then, the anchors 16a and 16b attenuate the long-mid period component.

Further, the dampers 17a and 17b are interposed between the foundation 13 and the anchors 16a and 16b, and exert a vibration damping function by resisting relative movement between the foundation 13 and the anchors 16a and 16b. It is supposed to do.

Therefore, the following effects can be obtained in the above-mentioned building structure. Even in soft ground and liquefied ground, there is a seismic control effect such as the seismic isolation method that reduces the response of the building structure 11. The diagonal anchor 16 restrains the horizontal displacement of the building structure 11 at the time of the earthquake, and the base shear (shear force due to inertial force)
Since a part of the load is carried, the shearing force and bending moment of the pile 15 are reduced, and the safety of the antibody is improved and the cost is reduced. In order to reduce the earthquake input to the pile due to the deformation of the ground, it is effective to use a pile having a small rigidity and a large yield strength, that is, a steel pipe pile or a steel pipe wound RC pipe having a small shaft diameter. It eliminates the need for laminated rubber and pits that include dry areas around the building, as in the seismic isolation method, and reduces root cutting and the number of skeletons, thus shortening the construction period and cost. In addition, since there is no need for horizontal movement clearance on the seismic isolated floor, it can be used even when there is no room on the site, and measures such as flexible joints for moving equipment piping are also unnecessary. By applying this method to building structures of the old standard where no measures against liquefaction have been taken, it is possible to improve the seismic safety of foundation piles as well as buildings designed to the current standard.

FIG. 2 is a diagram showing a second embodiment of the present invention. In FIG. 2, the same components as those in FIG. 1 described above are designated by the same reference numerals, and the description thereof will be omitted.
The configuration shown in FIG. 2 is different from that of FIG. 1 in that piles 21a and 21b are used instead of the anchors 16a and 16b of FIG. The piles 21a, 21b are anchors 16a,
Like 16b, it is driven in a direction inclined with respect to the vertical line. Therefore, the upper ends of the piles 21a and 21b are connected to the foundation 13 via the dampers 17a and 17b, respectively.
It is connected to. Also in this configuration, the piles 21a, 2a
1b constitutes a damping body that suppresses horizontal vibration of the building structure 11 with respect to the upper structure portion 19.

In the building structure having the above structure, the piles 21a and 21b function as a vibration control mechanism to reduce the seismic input to the building structure 19 and to obtain the same operation and effect as the above-mentioned embodiment. Is obtained. As the dampers 17a and 17b used in the building structure, existing oil dampers, friction dampers, steel dampers, etc. can be used.

In the above embodiments, the upper ends of the anchors 16a, 16b and the piles 21a, 21b are connected to the foundation 13 via the damper 17, but the damper 1
The anchor may be directly connected to the foundation without using 7. Further, the pile 15 has its upper end rigidly joined to the foundation 13, but this joining may be pin joining.
Furthermore, by reducing the depth of penetration of the building structure, it is possible to further reduce the vibration input from the ground surface to the building structure. In order to eliminate the input to the foundation 13, the pile 15 may be a protruding pile.

FIG. 3 is a schematic diagram showing a third embodiment of the present invention. In this building structure, anchor 1
6a, 16b or piles 21a, 21b are driven in from the inside outside of the outline to the inside of the outline of the foundation in plan view. In this building structure, the seismic damper exerts a seismic control mechanism similar to the above case just below the building structure, and the anchor 16 is diagonally inclined toward the outside of the building structure.
Since the a, 16b and the piles 21a, 21b are not driven in but driven inward, the space for the site can be saved. Therefore, even if the site is small, it is possible to build a building structure provided with the vibration control mechanism of the present invention, and it is possible to save space.

A laminated rubber may be placed on the foundation 13 to provide a seismic isolation construction method. In this case, the anchor 16
The a, 16b and the piles 21a, 21b eliminate the influence of the amplitude amplification by the soft ground 12 and directly transmit the vibration of the supporting base to the foundation of the building structure 1, as if a good supporting base under the foundation. It is something that you do. As a result, it is possible to obtain a response reduction effect (seismic isolation effect) similar to that of a seismic isolation structure on good ground. Furthermore, although the case where the building structure is present on the soft ground on the supporting ground has been described as an example of the embodiment, the present invention can also be applied to the case of building on a normal surface ground.

[0022]

According to the present invention, it is possible to restrain the displacement in the horizontal direction by using the diagonal anchor or the diagonal resister, and to positively utilize the soft ground or the liquefied ground to damp the vibration. The vibration can be damped by using a damper. Therefore, it becomes easy to install the vibration control mechanism of the building structure especially on the soft ground, and the seismic isolation pit floor including the laminated rubber and the dry area around the building as in the conventional seismic isolation construction method is not required. Shortening and cost reduction are possible.

[Brief description of drawings]

FIG. 1 is a schematic view of a building structure provided with a vibration control mechanism showing an embodiment of the present invention.

FIG. 2 is a schematic diagram of a building structure provided with a vibration control mechanism showing a second embodiment of the present invention.

FIG. 3 is a schematic diagram of a building structure provided with a vibration control mechanism showing a third embodiment of the present invention.

FIG. 4 is a schematic view of a building structure using a conventional seismic isolation construction method using laminated rubber.

[Explanation of symbols]

 1 ... Upper building structure 2 ... Ground surface 3 ... Seismic isolation floor 4 ... Anti-5 ... Laminated rubber 11 ... Building structure 12 ... Ground 13 ... Foundation 16a, 16b, 16c ... Anchor 17a, 17b ... Damper 19 ... Superstructure Objects 21a, 21b ... Pile

Claims (3)

[Claims] 1. A seismic control body composed of anchors or piles is driven from the foundation of a building structure into the ground in a direction inclined with respect to a vertical line, and the seismic control body is provided in the building structure. At least a pair including a first damping body that restrains displacement of the upper structure in one direction in the horizontal direction, and a second damping body that restrains horizontal displacement of the upper structure in a direction different from the one direction. A building structure equipped with a vibration control mechanism characterized by comprising a vibration control body. 2. The building structure provided with the vibration control mechanism according to claim 1, wherein the upper end of the vibration control body is connected to the foundation through a damper. Building structure. 3. The building structure provided with the damping mechanism according to claim 1, wherein the damping body is struck from inside to outside of the contour within the contour of the foundation in plan view. A building structure equipped with a vibration control mechanism.