JPH08326155A - Overturning control device for structure - Google Patents

Abstract

PURPOSE: To reduce earthquake input to lighten damage while controlling overturning of a structure in an earthquake by interposing a deformation mem ber which makes the relationship between the axial force of an anchor bolt and the floating change of a base plate be a nonlinear characteristic between a binding nut of the anchor bolt and the base plate. CONSTITUTION: An anchor bolt 2 is provided on a foundation 1, and a base plate 4 of the base of a column 3 is bound by the bolt 2. An elatic deformation member 6 is interposed between the binding nut 5 of the bolt 2 and the plate 4 of the base 3 of a column. By this arrangement, the relationship between the axial force of the bolt 2 and the floating change of the plate 4 is made a nonlinear characteristic. Thus, when overturning of a structure and drawing of the bolt 2 due to the bending moment of the base 3 of a column are caused, overturning of the foundation 1 part is suitably permitted so as to reduce earthquake input and lighten damage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a structure such as a building / civil engineering structure having a column base of a steel frame structure, or a basic part of a structure such as various furnitures, computers and various building equipments. The present invention relates to a structure overturn control device for reducing the earthquake input to these structures and controlling the destruction and overturn of the structures due to the seismic force.

[0002]

2. Description of the Related Art Conventionally, a column base having a steel frame structure such as a building / civil engineering structure is generally provided with an anchor bolt 2 on a foundation 1 as shown in FIG.
The base plate 4 of is tightly attached to the foundation 1
It controls the fall of buildings and civil engineering structures caused by an earthquake.
In this way, by tightly connecting the base plate 4 of the column base 3 to the foundation 1 via the anchor bolts 2, it is possible to control the fall of buildings and civil engineering structures when an earthquake occurs, but the seismic force remains unchanged. It is input to the building / civil engineering structure side from 1 through the column base 3. In this case, the seismic force acting on the building / civil engineering structure, etc. is transmitted from the foundation 1 to the column base 3 as it is, so that the response of the superstructure such as the building / civil engineering structure generally increases, and the damage is large. Therefore, there is a problem that it is necessary to increase the strength so as to withstand the seismic force.

[0003]

An object of the present invention is to construct a structure such as a building or civil engineering structure in which a base plate 4 of a column base 3 is tightly connected to a foundation 1 via anchor bolts 2 when an earthquake occurs. While controlling the fall of structures such as buildings and building equipment, it is possible to reduce the earthquake input to these structures and reduce the damage to the structures, and at the same time, to perform the construction easily. To provide a fall control device.

[0004]

In order to solve the above-mentioned problems, a structure overturning control device according to the present invention is a structure overturning control device in which a structure base plate is tightly connected to a foundation via anchor bolts. In the above, an elastically deformable member having a non-linear characteristic of the relationship between the axial force of the anchor bolt and the floating displacement of the base plate is interposed between the tightening nut of the anchor bolt and the base plate, and the tightening nut is used for tightening. It is characterized by what is done.

[0005]

According to the structure overturning control device of the present invention, the axial force of the anchor bolt and the floating displacement of the base plate are caused by the elastically deformable member interposed between the base plate of the structure and the tightening nut of the anchor bolt. Since the relationship with is a non-linear characteristic, it is possible to properly allow the foundation of the structure to fall and reduce seismic input to the upper structure.

[0006]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a side view of a structure overturning control device according to the first embodiment, FIG. 2 is a plan view of the same device, FIG. 3 is a characteristic diagram of the same device, and FIG. 4 is a structure of the second embodiment. FIG. 5 is a side view of the fall control device, FIG. 5 is a plan view (A) and side views (B), (C) of the structure fall control device according to the third embodiment, and FIG. 6 is a structure according to the fourth embodiment. (A) and side views (B), (C) of the fall control device of FIG. 7, FIG. 7 is a side view (A) and a characteristic diagram (B) of the fall control device for structures according to the fifth embodiment. FIG. 8 is a side view (A) and a vertical sectional view (B) of a structure overturning control device according to a sixth embodiment, and a characteristic diagram (C). FIG. 9 shows another type of column base of a steel structure. The plan views (A) to (D) shown in FIG. 10 and FIG. 10 are side views (A) and (B) showing examples of application to other structures.

In the first embodiment shown in FIGS. 1 to 3, an anchor bolt 2 is provided on a foundation 1 of a structure, and a base plate 4 of a column base 3 of a steel frame is tightly connected to the foundation 1 by the anchor bolt 2. The elastic deformation member 6 made of a leaf spring is interposed between the tightening nut 5 of the anchor bolt 2 and the base plate 4 of the column base 3 to control the fall of the building / civil engineering structure or the like due to an earthquake. It constitutes a falling control device for a structure that can perform.

As described above, the elastic deformation member 6 is provided between the tightening nut 5 of the anchor bolt 2 and the base plate 4 of the column base 3.
With the interposition of, the relationship between the axial force N of the anchor bolt 2 and the lift displacement δ of the base plate 4 can be made to have a non-linear characteristic as shown in FIG. In addition,
This non-linear characteristic can be set in various ways by designing according to the conditions on the structure side.

However, according to the structure overturning control device of the first embodiment, when the anchor bolt 2 is set during construction, the base plate 4 of the column base 3 and the anchor bolt 2 are set.
It is only necessary to interpose an elastically deformable member 6 made of a leaf spring between the elastically deformable member 6 and the fastening nut 5, and the anchor bolt 2 can be easily installed by the elastically deformable member 6.
Since the relationship between the axial force N of the base plate 4 and the lifting displacement δ of the base plate 4 can be made to have a non-linear characteristic, when the anchor bolt 2 is pulled out due to the overturning of the structure or the bending moment of the column base 3, the structure It is possible to properly allow the foundation of the object to fall and reduce the seismic input to the superstructure.

Therefore, while controlling the fall of the structure,
Seismic input can be reduced and damage to structures can be reduced. This is based on the experience that, despite the fact that the anchor bolts of a very thin and tall building were pulled out of the foundation outside the design during the Great Hanshin Earthquake, the upper building was only slightly damaged from the outside. The anchor bolt came out and the foundation was allowed to fall,
It is considered that the earthquake input to the upper building was reduced and the damage to the building was reduced.

The elastically deformable member 6 having a non-linear characteristic of the relationship between the axial force N of the anchor bolt 2 and the floating displacement δ of the base plate 4 is formed by a helical spring as in the second embodiment shown in FIG. Alternatively, it may be constituted by a viscoelastic body such as lead or rubber. In any case, the same effect as that of the first embodiment can be obtained. Further, as the elastically deformable member 6, a circular disc spring as in the third embodiment shown in FIG. 5 or a rectangular disc spring as in the fourth embodiment shown in FIG. 6 can be used. In this case, the circular disc spring is used. The spring or the rectangular disc spring may be installed with one circular disc spring or rectangular disc spring lying down as shown in (B) of FIGS. 5 and 6, or a circular disc spring as shown in (C) of FIGS. Two disc springs and rectangular disc springs can be installed so as to face each other.

Further, the elastically deformable member 6 is shown in FIG.
A conical shape in which a leaf spring is wound in a conical shape as in the fifth embodiment.
It is possible to use a coil spring, and in this case as well,
G2 axial force N and base plate 4 floating displacement δ
And the nonlinear characteristic as shown in FIG. 7B.
be able to. Further, as in the sixth embodiment shown in FIG.
The elastic deformation member 6 is attached to the outer peripheral surface and the inner peripheral surface at a certain angle.
Constructed by fitting a pair of ring springs with convex tapered surfaces
Axial force of the anchor bolt 2 in this case
Characteristics of the relationship between N and the lift displacement δ of the base plate 4
Is k as shown in FIG.₁Is the stiffness of the ring spring, k
₂Is the rigidity of the anchor bolt

[Equation 1] Shows the characteristics of the example in the figure.

On the other hand, as the column base 3 of the steel frame structure, in addition to H-shaped steel, I-shaped steel, box-shaped steel, steel pipe columns, U-shaped steel and the like as shown in FIGS. 9A to 9D can be used. Also, the anchor bolts 2 can be appropriately set to two stations, three stations, etc. in accordance with this. Further, the present invention has the same structure not only in a basic portion of a structure such as a building / civil engineering structure but also in a basic portion of a structure 7 such as various furniture, a computer, and various building equipment devices as shown in FIG. It can be similarly applied as a fall control device for the object 7, and in this case, the fall control device may appropriately set the shape and size according to the required axial force N and the initial lifting displacement δ.

[0014]

As described above, according to the overturning control device for a structure of the present invention, the construction can be performed only by interposing the elastically deformable member between the tightening nut of the anchor bolt and the base plate. , Can be easily installed. Further, by making the relationship between the axial force N of the anchor bolt and the lifting displacement δ of the base plate non-linear by this elastically deformable member, the anchor bolt is pulled out due to the structure falling or the column base bending moment. In this case, since it is possible to properly allow the foundation of the structure to fall and reduce the seismic input to the upper structure, the seismic input can be reduced to reach the structure while controlling the falling of the structure. The damage can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a structure overturn control device according to a first embodiment of the present invention.

FIG. 2 is a plan view of the structure overturn control device according to the first embodiment of the present invention.

FIG. 3 is a characteristic diagram of the overturning control device for structures according to the first embodiment of the present invention.

FIG. 4 is a side view of a structure overturn control device according to a second embodiment of the present invention.

FIG. 5 is a plan view (A) and side views (B), (C) showing a structure overturning control device according to a third embodiment of the present invention.

FIG. 6 is a plan view (A) and side views (B) and (C) showing a structure overturn control device according to a fourth embodiment of the present invention.

FIG. 7 is a side view (A) and a characteristic diagram (B) showing a structure overturning control device according to a fifth embodiment of the present invention.

FIG. 8 is a side view (A), a vertical sectional view (B) and a characteristic diagram (C) showing a structure overturning control device according to a sixth embodiment of the present invention.

FIG. 9 is a plan view (A) to (D) showing a form of a column base of a steel frame structure according to another embodiment of the present invention.

FIG. 10 is a side view (A) and (B) showing an application example of the present invention to another structure.

FIG. 11 is a side view (A) and a plan view (B) showing a conventional structure overturning control device.

[Explanation of symbols]

 1 Foundation 2 Anchor bolt 3 Column base 4 Base plate 5 Tightening nut 6 Elastic deformation member 7 Structure

Claims (2)

[Claims] 1. A fall control device for a structure, wherein a base plate of a structure is tightly connected to a foundation via anchor bolts, wherein an axial force of the anchor bolt is applied between a tightening nut of the anchor bolt and the base plate. A fall control device for a structure, comprising: an elastically deformable member having a non-linear characteristic in relation to a floating displacement of the base plate; 2. The elastically deformable member is selected from at least one of leaf springs, spiral springs, disc springs, conical spiral springs, ring springs, and viscoelastic bodies such as lead and rubber. The falling control device for a structure according to claim 1.