WO1998030771A1

WO1998030771A1 - Passive damping system

Info

Publication number: WO1998030771A1
Application number: PCT/JP1998/000096
Authority: WO
Inventors: Yoshihiko Akao
Original assignee: Yoshihiko Akao
Priority date: 1997-01-14
Filing date: 1998-01-14
Publication date: 1998-07-16
Also published as: JPH10196720A

Abstract

A method of damping vibration of a structure due to disturbances such as earthquake and wind, and more particularly, to a combination of a damping method, structure and materials, which do not need any special damping device, and which provide high damping effects by applying effective resistance to a slight deformation between upper and lower layers with a simple improvement in construction. In a multi-layered structure such as buildings, comprising columns (1), beams (2) and floors, which bear various loads exerted on a skeleton, as main structural members, and earthquake resisting walls (3) or braces (4), which bear vertical loads and horizontal loads but do not deform horizontally, as auxiliary structural members, a damping structure is such that an upper end or lower end of the auxiliary structural member is fixed to a floor diaphragm (surface constituted by beams and a floor) of the main structural members, and the other end not fixed is joined to another floor diaphragm with a damping element (5) therebetween, which element bears a load and has a damping property. A damping method comprises converting a slight horizontal shearing deformation produced between the layers into a large shearing strain of a thin damping element portion to permit the damping element to absorb vibrational energy when a disturbance vibrates the multi-layered structure. The use of materials such as a highly damping rubber for the damping element enables simultaneous energy absorption and load bearing.

Description

Description Passive vibration suppression system Technical field

The present invention provides a so-called passive vibration damping system (damping method) that attenuates interstory deformation vibration generated in a layered structure due to disturbance such as an earthquake or wind by a method that does not require vibration control by external force or the like. Vibration method, vibration control structure and system including materials).

This vibration damping system can be applied to a wide range of fields, such as civil engineering, construction, machinery, etc., as long as it is a layered structure, regardless of whether it is a multi-layer or single-layer structure. It is effective for multi-story high-rise buildings composed of beams, floors and floors. Background art

There are two types of conventional seismic structures for buildings: a rigid structure that has strong seismic resistance against all types of seismic motion, and a flexible structure that has a natural period longer than the predominant period of seismic motion and flexibly receives seismic force. Yes, these structures have been used differently depending on the height and type of building. For example, low-rise buildings and nuclear power plant buildings are designed to have a rigid structure to receive seismic force robustly, while skyscrapers, high-rise towers, and long bridges are designed to have a soft structure to receive seismic force softly. I have. However, high-rise structures such as flexible skyscrapers are susceptible to the effects of wind loads and are subject to resonance vibrations due to wind loads.

On the other hand, as a new seismic structure, seismic isolation A seismic isolation structure that temporarily cuts off the flow of seismic force transmitted from the ground, and a structure against external forces such as earthquakes and wind, using vibration damping devices installed inside or outside the structure. Vibration control structures that try to reduce the size of objects have been put to practical use or proposed for structures such as buildings and bridges.

The vibration damping structure is based on the difference in the method of damping the vibration response of the structure, and it is possible to control the vibration variably and independently according to the response state. Passive vibration suppression, which attempts to attenuate vibrations, is divided into two types. Regardless of the method of damping, in the structure proposed in the past, a new damping device was installed at a main part of the vibration mode such as a building or a tower, or a reaction force of a different damping from the main structure was applied. Auxiliary structure must be set, and there is a major cost disadvantage that the space and load of the vibration damping device increase, and there is no relation to the structure that supports the frame, and the extra structure increases. In addition to the above methods, vibration suppression methods have been proposed to control the deformation stiffness between layers.However, the amount of interlayer deformation of multilayer structures caused by earthquakes, winds, etc. is small compared to the height of the layers. Therefore, it is considered difficult to obtain a sufficient damping effect even if the rigidity is suppressed between layers. Disclosure of the invention

The present invention is a vibration damping structure that attenuates deformation vibration caused by external forces such as earthquakes and winds without installing new additional devices or additional structures by replacing part of the main structure that supports the frame with auxiliary structures. is there. The damping method is to use a relatively rigid floor diaphragm for the entire structure.

In a multi-story building composed of (a surface composed of beams and floors) and relatively soft columns, a small amount of space is created between the upper diaphragm and the lower diaphragm. The Kana horizontal interlayer deformation is concentrated in the narrow part between the layers, and high damping synthetic rubber is installed between them to absorb the vibration energy inside the structure and reduce the vibration at an early stage. Brief description of figures

Fig. 1 shows a case where earthquake-resistant walls are used as auxiliary structural members. FIG. 2 is a diagram when a brace is used as an auxiliary structural member. FIG. 3 is a diagram illustrating the principle of how a vibration damping structure absorbs shear deformation. Fig. 4 is a diagram of an example of a member for attaching a damping element between a beam and a shear wall. BEST MODE FOR CARRYING OUT THE INVENTION

The system proposed in the present invention is a type of passive vibration suppression that attempts to suppress vibration due to interlayer deformation.However, the main structure that supports the frame without any extra devices or extra structures such as vibration suppression devices is provided. In this method, a slight deformation between layers is increased by applying damping force by replacing a part with an auxiliary structural member containing a damping material, thereby obtaining a damping effect. The auxiliary structural members used here support the load of the skeleton similarly to the main structural members.

In order to explain the present invention in more detail, this will be described with reference to the accompanying drawings.

In Fig. 1 and Fig. 2, columns 1 and beams 2 are basic main structural members that support the load of the skeleton, and are the parts that deform and vibrate due to disturbances such as earthquakes and wind. In the present invention, the earthquake-resistant wall 3 and the brace 4 are auxiliary structural members. In principle, the upper end or lower end of the auxiliary structural part is fixed to the floor diaphragm of the main structural part, and the other end not fixed sandwiches the damping element 5. It is joined with another floor diaphragm. The damping element supports the load It is joined to another floor diaphragm with a material such as high-damping rubber having damping properties. Therefore, the auxiliary structural members can support part of the vertical and horizontal loads of the building.

The same damping effect can be expected in the auxiliary structure where a damping element is sandwiched between the upper and lower ends, or a structure where the upper and lower ends are fixed to the floor diaphragm and the damping element is sandwiched between the upper and lower ends. In addition, it is preferable that the left and right ends of the auxiliary structural parts such as braces and earthquake-resistant walls are not in contact with the main structural members so as not to be deformed by the deformation and vibration of the skeleton.

The operation of the present invention will be described with reference to FIG. When a multi-layered structure such as a building vibrates due to an earthquake or wind, horizontal deformation of the frame mainly appears as shear deformation between the upper and lower diaphragms 6 as shown in the figure. The slight shear deformation between the layers is concentrated on the thin damping element 5 using an auxiliary structural member that is not easily deformed, and a large shear strain is applied to the damping element as shown in the figure to exhibit high damping performance. This is the method of damping.

The feature of the present invention is that the vertical load and the horizontal load of the skeleton can be supported also on the auxiliary structure portion by using the high damping rubber, and the structure can be rationalized.

Fig. 4 shows an example of a member structure for connecting a beam 2 that is a part of the floor diaphragm to a shear wall via a damping element 5, and the beam 2 is connected to a shear wall by a stud 8 fixed to a flange 7. You.

The damping performance between the layers can be arbitrarily given by changing the thickness and the effective area of the damping element, in addition to the inherent properties of the material used as the damping element. The amount of damping performance between the layers may be determined in consideration of the vibration characteristics of the entire structure.

The damping element is a high damping rubber that is a synthetic rubber with a damping constant of 10% or more. Is considered appropriate. However, what kind of member should be used should be selected in accordance with conditions such as the availability of the structure and whether the structure of the skeleton is a reinforced concrete structure or a steel frame structure. Industrial applicability

In particular, this vibration control system is difficult to have a seismic isolation structure like a skyscraper, it is difficult to suppress vibration externally, it has a long natural period and internal damping / J \ Are suitable.

This vibration control system does not require a special vibration control device, is a simple structure and has no waste in attenuating slight distortion between layers. It is expected that this system can be realized at a small cost.

In particular, by sharing the load on the auxiliary structural members, the columnar amount of the main structural members can be reduced, and therefore, the effect of reducing the seismic load applied to the structure by lengthening the natural period of the frame can be expected. The above advantages and seismic resistance can be improved at the same time.

Claims

The scope of the claims

1. A system for damping the horizontal vibration of a layered structure. In addition to the main structural members that support vertical and horizontal loads, they support vertical and horizontal loads but are not easily deformed in the horizontal direction. Auxiliary structural members are provided to increase the level of horizontal shear deformation while supporting the load, and to join the main structural members and the auxiliary structural members via a damping material (damping element). A vibration control method that converts the interlayer displacement difference caused by vibration into shear deformation of the damping element between the main structural member and the auxiliary structural member to absorb the vibration energy and attenuate the vibration of the structure And its structure.

2. In the description of claim 1, a high damping rubber damping device made of a synthetic rubber having a damping constant of〗 0% or more is used as the damping element.

3. The damping method and structure according to Claims 1 and 2, wherein the auxiliary structural member does not support a vertical load.

Claims of amendment

[1 May 05, 1998] Accepted by the International Bureau: Claims 1 originally filed have been amended; other claims remain unchanged. (1 page)]

1. (After correction) Regarding the system that dampens horizontal vibration of layered structures, in addition to the main structural members that support vertical and horizontal loads, they also support vertical and horizontal loads, but The main structure is not easily deformed, and is provided with an auxiliary structural member such as a brace. By joining the auxiliary structural sound, the difference in interlayer displacement caused by horizontal vibration of the structure is converted into shear deformation of the damping element between the main structural member and the auxiliary structural member to absorb vibration energy. A damping method for damping vibration of a structure and its structure.

2. In the description of Claim 1, a high-damping rubber made of synthetic rubber having a damping constant of 10% or more is used for the damping element.

3. The method according to Claims 1 and 2, wherein the auxiliary structural member does not support a vertical load, and the vibration damping method and its structure.

Amended paper (Article 19 of the Convention) Description based on Article 19 (1) of the Convention The present invention is intended to partially apply a static load, such as a layer shear force, applied to an earthquake-resistant design of a building structure to a damping element having a strong adhesive force. However, the load on the main structural member is reduced accordingly.

There are already inventions that use oil dampers and polymer compounds to dampen the vibrations of structures, but conventional inventions only aim at damping dynamic vibrations and use a static load damping device. It is not assumed that the burden will be placed on the part. However, materials such as synthetic rubber exhibit a strong adhesive force when vulcanized and pressed, and can withstand large shear loads and high surface pressures. It is also possible to support a part of the load of the main structure part to the auxiliary structure part.

However, it was found that there was a method of combining the earthquake-resistant wall and the high damping rubber in the prior patent, so in the description of claim 1, the scope was limited to the use of a structure such as a brace as an auxiliary structural member.