JPH0754357A - Eaerthquake resistant structure for construction - Google Patents

Abstract

PURPOSE:To display damping force to seismic force by providing the rigid foundation around the foundation of a structure to be constructed on the weak ground, and jointing this structure to the rigid foundation by various dampers. CONSTITUTION:The weak ground around the foundation 2 of a structure 1 s subjected to soil improvement (4) by a high pressure core injection method, for instance. Rigid foundation structure 3 firmly fixed by ground anchors 5 and the like is provided, and the structure 1 and the rigid structure 3 are jointed by various dampers 8, vibration control devices. When the top part of the structure 1 is horizontally deformed by seismic force, one end of the structure 1 floats off from one side of the foundation 2, but the vertical deformation of the foundation part generated at this time is forced to act upon the dampers 8 to perform required earthquake control. In addition to thus reducing the fixed quantity of vibration to a large earthquake, various vibration control devices 7, passive, active, and the like are installed in the important positions of the structure 1 so as to reduce vibration effectively in combination with the dampers 8 at the foundation part.

Description

Detailed Description of the Invention

[0001]

[Industrial field of application] When constructing a structure on soft ground, the present invention relates to a seismic structure that is resistant to lift-up deformation in which the structure tends to fall due to seismic force.

[0002]

2. Description of the Related Art Conventionally, in a structure constructed on soft ground, a rigid foundation was constructed, a structure was constructed on the rigid foundation, and a corresponding earthquake resistant structure was provided, but the structure tends to fall. There was no suitable means for lifting deformation.

[0003]

As described above, conventionally, when constructing a structure on soft ground, a large rigid foundation is constructed, the structure is constructed on it, and the appropriate seismic resistance is established. I had to set up a structure. The present invention has been devised to solve these problems.

[0004]

[Means for Solving the Problems] First, the ground on which a structure is to be constructed is improved by, for example, a high pressure injection method,
A rigid foundation is provided around the structure, and the structure and the foundation are joined by various dampers. Further, the structure is such that a dynamic vibration absorber, an active dynamic vibration absorber or an active vibration control device is installed on the upper layer of the structure. In addition, a damper or an active vibration control device, for example, a variable damping device or a variable rigidity device is attached to an important part of the structure of the structure, for example, between the joints of the brace member beam and the column. It is also possible to adopt a structure in which attachment of these various vibration control devices is combined.

[0005]

[Operation] The principle of vibration reduction by the foundation damper is as follows. When the top of the structure undergoes horizontal deformation δ _H , one end of the structure floats from one side of the foundation. At this time, the structure is δ
A deformation angle of _H / H is produced. Here, H represents the height of the structure. At this time, the vertical deformation of the foundation due to only the lifting deformation is δ
Only _F = (δ _H / H) × (L / 2) occurs. Here, L represents the width of the structure in the floating deformation direction. This situation is shown in Figure 2.
As shown in FIG. Since the damping force can be exerted by installing the damper in the portion that causes the difference in deformation, a foundation that constrains vertical deformation is installed in the periphery and a damper is installed between the structure and the foundation, and δ _F The deformation of the force acts on the damper to achieve the purpose of earthquake resistance.

[0006]

EXAMPLE FIG. 1 shows an example of the present invention. The soft ground around the foundation 2 of the structure 1 is ground-improved 4 by, for example, a high-pressure injection method, and a rigid anchoring structure 3 is provided by a ground anchor 5 or the like, and the structure 1 and the rigid foundation structure 3 are provided. The gaps are joined by a vibration control device, that is, various dampers 8. As a result, a vibration damping effect is exerted against the floating deformation in which the structure ground is soft and the structure is about to fall. With the structure of the present invention, a certain amount of vibration is reduced against a large earthquake, and an additional weight type vibration control device, such as a dynamic vibration absorber, is attached to the top of the structure.
Install an active dynamic vibration reducer or active mass driver 6 etc. to achieve greater vibration damping. Further, by installing various types of passive and active vibration control devices 7 between the joints with the important points of the structure, for example, brace beams and columns, it is possible to effectively reduce the vibration by combining with the damper of the foundation part. I can.

[0007]

The seismic resistant structure is particularly effective when the existing structure has insufficient surface safety. Also, by installing a vibration control device on the top of the structure, effective vibration damping from medium to large earthquakes can be achieved. In other words, by using elastic dampers, oil dampers, etc., that are relatively inexpensive, to reduce the response to a certain extent in the event of a large earthquake, and also by installing an active vibration control device that is relatively expensive but has a large response reducing effect. , It is possible to keep the upper limit of the vibration reduction range of the active vibration control device low, and in combination with the effect of the foundation damper, a large vibration reduction effect can be obtained, from small / medium earthquakes to large earthquakes, and vibrations due to windstorms. .

[Brief description of drawings]

FIG. 1 is a diagram showing the structure of the present invention.

FIG. 2 is a diagram showing a principle of floating deformation in which a structure is about to fall.

FIG. 3 is a diagram showing a floating deformation in which a structure is about to fall.

[Explanation of symbols]

1 ... Structure, 2 ... Structure foundation, 3 ... Rigid foundation structure, 4 ... Improved ground, 5 ... Ground anchor,
6 ... Vibration control device (dynamic vibration absorber, active dynamic vibration absorber or active mass driver), 7 ... Vibration control device (damper or active vibration control device), 8
···damper

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Taiji Kurokawa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Within Kashima Construction Co., Ltd. (72) Inventor Haruhiko Kurino 1-2-7 Moto-Akasaka, Minato-ku, Tokyo No. Kashima Construction Co., Ltd.

Claims (4)

[Claims] 1. Immediately below and around the foundation 2 of the structure 1, ground improvement 4 is performed, and a rigid foundation structure 3 is provided around the structure 1, and the structure 1 and the rigid foundation structure 3 are Seismic resistant structure for structures, characterized in that the gaps are joined by a damper 8. 2. The seismic resistant structure for a structure according to claim 1, wherein a vibration control device 6 is installed on an upper layer portion of the structure 1. 3. A vibration control device 7 is provided at a main part of the structure of the structure 1.
The seismic resistant structure of the structure according to claim 1, wherein the structure is installed. 4. The seismic resistant structure for a structure according to claim 1, which is a combination of the seismic resistant structures according to claim 2 and claim 3.