JPH08277872A - Energy absorber for structure - Google Patents

Abstract

PURPOSE: To absorb the vibrational energy of a structure by composing an energy absorber of a rod reciprocated by the vibration of the structure and provided with a rack gear, a rotor provided in lead and connected to a pinion gear meshed with the rack gear, and a casing for accommodating and constraining the lead and the rotor. CONSTITUTION: When a structure is vibrated, a rod 1 is reciprocated, and a pinion gear 2 meshed with a rack gear 1a provided at the rod 1 is rotated. A rotor 5 is thereby rotated in lead 6 in the void of a casing 4. The lead 6 constrained in the void of the casing 4 is shear-deformed by the rotation of the rotor 5, and the periodic vibrational energy of the structure is absorbed by the consumption of energy at this time. Even in the case of the displacement of the structure being large, there is no need to enlarge the weight and volume of the whole device, and the long stroke of the reciprocating rod 1 is made possible, so that vibrational energy can be absorbed effectively, and resistance to the vibration can be adjusted easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called energy absorbing device for a structure, which absorbs periodic vibration energy such as an earthquake acting on a structure such as a building or a pipe, and more specifically, a plastic deformation of lead. The invention relates to an energy absorption device.

[0002]

2. Description of the Related Art An energy absorbing device utilizing plastic deformation of lead, a so-called lead damper, which is called a cylinder type lead damper, is known, for example, from Japanese Patent Publication No. 58-30470 (Japanese Patent Laid-Open No. 48-72941). Further, what is called an oscillating lead damper is disclosed in JP-A-2-26.
It is known from Japanese Patent No. 332.

As shown in FIG. 3, a conventional cylinder type lead damper includes a cylinder 7, a rod 8 having a protrusion inserted through the cylinder 7 in the axial direction, and the cylinder 7. And lead 8 enclosed in the space between rod 8 and rod 6, and lead 6 is sheared and deformed by passing through the reduced cross-section formed in the space by the relative movement of cylinder 7 and rod 8. , The periodic energy is absorbed by the energy consumption at this time.

As shown in FIG. 4, a conventional swing-type lead damper has a casing 4, a deformed rotor 5 placed in the center of the casing 4, and a casing 4 and the rotor 5 enclosed in a space. It is composed of lead 6 that has been removed, a rotor arm 9 that is fixed to rotor 5, and a connecting rod 10 that is attached to a vibration suppression target.
The reciprocating motion of the connecting rod 10 is caused by the rotor arm 9 to rotate the rotor 5
However, when the rotor 5 rotates in the casing 4, the lead 6 is sheared and deformed, and the energy consumption at this time absorbs the periodic energy.

[0005]

For damping an earthquake such as a large-scale suspended ceiling during an earthquake, a damping device having a small stroke but a large stroke is required. In order to increase the stroke in the conventional cylinder type lead damper, it is necessary to lengthen the cylinder 7 and the rod 8, which increases the amount of lead 6 and increases the wall thickness of the cylinder in terms of strength. There is a problem that the weight of the device is larger than the resistance force. In order to increase the stroke in the conventional swing-type lead damper, it is necessary to increase the length of the rotor arm 9 and there is a problem that the device cannot be made compact.

Further, since the lead damper absorbs energy by utilizing plastic deformation due to shear deformation of lead, it is difficult to design an individual lead damper having arbitrary resistance. There is.

The present invention is intended to provide an energy absorbing device for a structure which can solve the above problems.

[0008]

[Means for Solving the Problems]

(1) The energy absorbing device for a structure according to the present invention is connected to a rod attached to a structure to be damped and provided with a rack gear that reciprocates by vibration of the structure, and a pinion gear that meshes with the rack gear. And a rotation energy absorbing part formed of a casing for accommodating the lead and the rotor and constraining them. (2) Also, the energy absorbing device for a structure of the present invention is
In the invention of (1) above, the rod is provided with a plurality of the rotational energy absorbing portions.

[0009]

In the present invention (1), the rod reciprocates due to the vibration of the structure, and the rotor rotates in the lead through the pinion gear that meshes with the rack gear provided on the rod.
As a result, the lead is shear-deformed in the casing that restrains the rotor and lead, and the periodic vibration energy of the structure is absorbed by the energy consumption at this time.

Further, in the present invention (2), a rotor that is connected to a pinion gear that meshes with a rack gear provided on a rod that reciprocates due to vibration of a structure and that rotates in lead, the lead, and the rotor. Since the rod is provided with a plurality of rotational energy absorbing portions each of which includes a casing that accommodates the two and restrains the two, the wobble of the reciprocating rod can be prevented, and the rotor can be reliably rotated. The resistance of the energy absorbing device for a structure according to the present invention can be adjusted by appropriately selecting the number of the above.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. Reference numeral 1 denotes a rod which is attached to a vibrating structure (not shown) and reciprocates by the vibration of the structure. A rack gear 1a is provided on the upper surface of the rod 1. Reference numeral 2 denotes a pinion gear that meshes with the rack gear 1a, and a substantially hexagonal deformed rotor 5 is connected to the pinion gear 2 so as to rotate together with the pinion gear 2. Reference numeral 4 denotes a casing in which the rotor 5 is housed in a circular space having a substantially cross section. Lead 6 is enclosed between the space of the casing 4 and the rotor 5, and the rotor 5 and the lead 6 are It is restrained by the casing 4. The pinion gear 2, the rotor 5,
The lead 6 and the casing 4 allow the rotational energy absorption portion 3
Is configured.

In this embodiment, when the structure vibrates, the rod 1 reciprocates, and the pinion gear 2 meshing with the rack gear 1a provided on the rod 1 rotates, which causes the rotor 5 to rotate.
Rotate in the lead 6 in the cavity of the casing 4. As the rotor 5 rotates in the lead 6 in the void of the casing 4, the lead 6 constrained in the void of the casing 4 undergoes shear deformation, and the energy consumption at this time causes periodic vibration energy of the structure. Is absorbed.

In the present embodiment, as described above, the vibration of the structure to be damped is rotated through the rack gear and the pinion gear to be transmitted to the rotational energy absorbing portion 3 so that the lead 6 is sheared and deformed. Therefore, even if the displacement of the structure is large, it is not necessary to increase the weight and volume of the entire apparatus, and a long stroke of the rod 1 that reciprocates due to the vibration of the structure is enabled to effectively absorb the vibration energy. can do.

A second embodiment of the present invention will be described with reference to FIG. In this embodiment, rack gears 1a are provided on both upper and lower surfaces of the rod 1 of the first embodiment, and two rotational energy absorbing parts 3 having the same structure as the first embodiment are vertically arranged so as to sandwich the rod 1. The pair of pinion gears 2 of the two rotational energy absorbing portions 3 are meshed with the rack gears 1a on the upper and lower surfaces of the rod 1, respectively, and
Two pairs of such rotational energy absorbing portions 3 are arranged at intervals in the axial direction of the rod 1.

In this embodiment, when a structure (not shown) vibrates, the rod 1 reciprocates, and the rotor 5 rotates through the pinion gear 2 in each rotational energy absorbing portion 3, whereby the first embodiment described above. The vibration energy is absorbed in the same manner as in.

Further, two pairs of rotational energy absorbing portions 3 are arranged so that the rod 1 is vertically sandwiched, and two pairs of such two rotational energy absorbing portions 3 are connected to the rod 1. Since the rods 1 are arranged at intervals in the axial direction, wobbling of the rod 1 in the vertical direction can be prevented, and the reciprocating motion of the rod 1 can be smoothly converted into the rotational motion of the pinion gear 2.

The resistance of the structure to vibration in this embodiment can be adjusted by the number of the rotational energy absorbing parts 3.

[0018]

Since the present invention has the structure described in claims 1 and 2 of the claims, even if the displacement of the structure to be damped is large, the weight and volume of the entire device are increased. It is possible to make the stroke of the rod compact and long without increasing the size, to effectively absorb the vibration energy, and to easily adjust the resistance force against the vibration. Therefore, according to the present invention, it is possible to ensure structural safety during an earthquake such as a large-scale suspended ceiling provided in a structure of a baseball field with a roof that undergoes large displacement.

[Brief description of drawings]

1 shows a first embodiment of the present invention, FIG. 1 (a) is an elevational view thereof, and FIG. 1 (b) is a sectional view showing its casing, rotor and lead.

FIG. 2 is an elevational view of a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of a conventional cylinder type lead damper.

FIG. 4 is an explanatory diagram of a conventional swing-type lead damper.

[Explanation of symbols]

 1 Rod 1a Rack Gear 2 Pinion Gear 3 Rotational Energy Absorber 4 Casing 5 Rotor 6 Lead

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hamamura recommended 1-1-1, Wadasaki-cho, Hyogo-ku, Kobe Sanryo Heavy Industries Ltd. Kobe Shipyard

Claims (2)

[Claims] 1. A rod which is attached to a structure to be damped and which reciprocates by vibration of the structure and which is provided with a rack gear, and a rotor which is connected to a pinion gear meshing with the rack gear and rotates in lead, and An energy absorbing device for a structure, comprising: a rotational energy absorbing portion including a casing that accommodates lead and the rotor and restrains both of them. 2. The energy absorbing device for a structure according to claim 1, wherein the rod is provided with a plurality of the rotational energy absorbing portions.