JPS622037A - Device for absorbing vibration energy - Google Patents

Abstract

PURPOSE:To maintain a function for a long time by allowing an elastic plastic material to be subjected to plastic torsional deformation in accordance with the relatively displaced positions between members, and eliminating a phenomenon of constriction of said elastic plastic material. CONSTITUTION:An elastic plastic material 5 having a bore on its center part, is closely interposed in between a fixing board 3 and a fixing board 4 which have bores on their center parts respectively, and a pin 6 is inserted into the bore parts. Arms 7, 8 each having a bore near its end, are installed to the two fixing boards 3, 4 respectively. Accordingly, when relative displacement takes place between structure members 1, 2 due to vibration, since repeated plastic torsional deformation occurs in the elastic plastic material 5, the vibration energy can be stably absorbed for a long time.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to vibration isolation or seismic isolation of structures, and utilizes the oily properties of materials to reduce the vibration response of structures during vibrations or earthquakes. The present invention relates to a perturbation energy absorption device.

[Background technology of the invention and its problems]

In order to prevent structures from being destroyed by earthquakes, various vibration energy absorbing devices have been considered. These vibration energy absorbing devices can be broadly classified into viscous dampers that utilize the viscosity of a fluid or viscoelastic body, friction dampers that utilize the friction of the same material, and moldable dampers that utilize the shape deformation of a material.

Among these dampers, many layered dampers utilize plastic deformation of metal materials, and are thought to be structurally simpler and more durable than other dampers, resulting in lower costs. Metal materials used for layered dampers include iron,
Lead or lead-based alloys are used, but lead-based materials in particular have excellent ear shape properties, have sufficient followability even in vibrations that involve large displacements, and have a strong plasticity. It is a damper member.

The basic structure of a plastic damper that utilizes the external shape characteristics of a lead-based material due to shear deformation is as shown in FIG. 3(a), in which the damper is joined and connected to each fixed plate fixed between members.

In these layered dampers, when a structure vibrates due to an earthquake or the like and relative displacement occurs between certain members of the structure, the plastic damper attached between the members undergoes strong displacement.

At this time, when the elastic material undergoes plastic deformation, an energy loss equal to the amount of work required for the plastic deformation occurs, so as a result, it absorbs the vibration energy between the members and reduces the vibration response of the entire structure. reduce

However, in the case shown in Figures 3 and 4,
When the elastic-plastic member 19 is repeatedly deformed in the lateral direction due to the relative displacement of the members 15 and 16 in the lateral direction in the figure, the fixed plate 1
7.Bending force between the part near the fixed plate 17.18 and the central part due to local restraint between 18 and the elastic-plastic member 19,
Due to the difference in the tensile forces, the elastic-plastic member 19 assumes a shape in which the portion X near the fixing plate 17, 18 is constricted and the central portion Y is bulged, as shown in FIG. 5, in a relatively short period of time. For this reason,
The resistance force required for plastic deformation becomes smaller and the energy absorption capacity decreases. Then, there is a problem in that the outer layer member 19 eventually breaks at the constricted portion and loses its function as an energy absorbing device. In such a case, the energy absorbing device loses its function, and the vibration response of the structure increases again, leading to damage to the structure and creating problems in the safety of the structure during vibration.

[Purpose of the invention]

The present invention was made in view of these circumstances, and eliminates the drawbacks of conventional layered dampers by utilizing torsional deformation of elastoplastic materials, and provides vibration dampers that can maintain stable function for a longer period of time. An object of the present invention is to provide an absorbing energy device.

[Summary of the invention]

According to the present invention, an elastoplastic material having a hole in the center is closely attached on both end surfaces to two fixing plates having a hole in the center, and the holes are connected with pins, and the two fixing plates has a structure in which an arm having a hole or a convex part near the tip is installed, and these have a hole or a convex part near the tip of the arm in a convex or concave part separately installed on two vibrating members. They are connected by pins and installed by fitting them.

〔Effect of the invention〕

According to the above configuration, the energy absorbing device of the present invention, which is attached between structural members that cause relative displacement when the structure vibrates during an earthquake, undergoes repeated plastic torsional deformation in accordance with the relative displacement between the members. Since the repeated deformation of the elasto-plastic material is torsional deformation, the constriction phenomenon of the elasto-plastic material, which is a drawback of conventional structures that utilize shear deformation, does not occur, so it maintains stable function for a longer period of time compared to conventional structures. can.

[Embodiments of the invention]

The present invention will be explained in detail below.

FIG. 1(b) is a sectional view of one embodiment of the present invention, and FIG. 1(b) is a plan view. Elastic material 5 with a hole in the center
is closely attached between fixing plates 3 and 4 having a hole in the center, and a pin 6 is inserted into the hole.

Furthermore, each of the two fixing plates has a structure in which an arm 7.8 having a hole near its tip is installed.

On the other hand, the vibrating structural members 1 and 2 are provided with a convex portion 9 and a convex portion 10, and the energy absorbing device is installed between the structural members by fitting the hole at the tip of the arm into these convex portions. Ru.

Note that FIG. 1(b) shows an example in which the opening angle of the arms 7 and 8 is about 45 degrees. Opening angle is 0 degrees or 1
When the opening angle is 80 degrees, there is a risk that a tensile load will be applied to the entire device due to the relative displacement of the structural members, and the larger the opening angle, the smaller the allowable relative displacement, so the general optimum angle is 90 to 45 degrees. There is a range of degrees. However, the opening angle is not particularly limited because it can be used at opening angles outside this range. Furthermore, lead and lead-based alloys are excellent as elastic-plastic materials, but other materials may also be used.

In such a vibration energy absorbing device according to the present invention, when a relative displacement occurs between the structural members 1 and 2 due to vibration, repeated plastic torsional deformation occurs in the elastic-plastic member 5, so that vibration energy can be stably absorbed for a long time. can do.

[Other Examples]

As shown in Figure 2, as a method of installing it on a structural member,
Convex portions 11 and 12 are provided near the tip of the arm 7.8, while concave portions 13 and 14 are provided in the structural members 1 and 2, and this device is installed between the structural members by pin connection using these convex portions and concave portions. You may.

[Brief explanation of the drawing]

1 and 2 are diagrams showing a vibration energy absorbing device of the present invention, and FIGS. 3 to 5 are sectional views explaining a conventional energy absorbing device. 1... Structural member (1) 9... Convex part (1) 2... Structural member (2110... Convex part (2) 3... Fixing plate (1)
111...Protrusion (3) 4...Fixing plate f2+
12... Convex portion (4) 5... Elastoplastic material 13
... Recess (1) 6 ... Pin 14 ...
・Concavity (2) 7...Arm (1) 8...Arm (2) Agent Patent attorney Noriyuki Chika (and 1 other person) (a) (b) Figure 1 Figure 2 Figure 1 5 figure

Claims (1)

[Claims] In order to absorb the kinetic energy generated between two structural members, an elastoplastic body with a hole in the center and two fixing plates each having a hole in the center, with the center aligned with both end faces of this elastoplastic body. are in close contact with each other and their holes are pin-coupled, and each of the two fixing plates is provided with an arm, which is pin-coupled to the two structural members near the ends of the arms. Vibration energy absorption device.