JPH0578618B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an elastoplastic damper device that is interposed at a joint between structures and absorbs vibration energy generated in the structures due to an earthquake or the like.

[Conventional technology and problems]

Expansion joints are usually provided between structurally separated structures to prevent thermal deformation and to prevent excessive stress from being generated locally during an earthquake. Since the vibration characteristics of the structures separated by the expansion joints are different from each other, the difference in the movement of each structure during an earthquake becomes large. Therefore, conventionally, an oil damper or the like is interposed in a joint member that connects structures to absorb vibration energy by utilizing the difference in movement when the structures vibrate.

However, since the oil damper only acts on force in one direction, the movement of the structure must be carefully considered when arranging the damper, making it extremely difficult to determine the mounting direction. Another disadvantage is that the seismic attenuation effect is low when vibrations occur simultaneously in multiple directions.

Furthermore, in recent years, for the purpose of seismic isolation of structures, a seismic isolation device that serves as both a support and a damper is often installed between the lower end of the structure and the foundation. As an example of a seismic isolation device, as shown in Fig. 23, a steel rod 23 is attached to a reinforced concrete block 24 in a cantilevered manner, and the surrounding area is formed into a morning glory shape, so that when a large horizontal force is applied, the steel rod 23 is supported by surrounding reinforced concrete blocks 24 has been developed.

However, since the damper portion of this seismic isolation device is made of a steel rod, there is a problem in that the yield load is small and a large resistance moment cannot be obtained.

This invention was devised to solve the above problems, and can be applied to both seismic attenuation devices and seismic isolation devices, eliminates the need to determine the installation direction, and is suitable for use in structures with extremely large plastic deformation capabilities. It is an object of the present invention to provide an elastic-plastic damper device arranged.

[Means for solving problems]

The elastoplastic damper of the present invention has a hollow, cylindrical or substantially cylindrical damper body, and a base plate is integrally provided around the bottom of the damper body, and the thickness of the damper body is tapered so that the thickness of the damper body becomes sequentially thicker on the base plate side. It is characterized by
Installed between structures. The top of the damper body is pin-jointed to prevent bending moment from occurring at the joint.

Further, base plates may be integrally provided around the bottom and top of the damper body, respectively, and the damper body may be formed in a tapered shape so that the base plates become thicker in sequence than the middle part of the body.

A plurality of bolt insertion holes are formed in the base plate, and the bolts are passed through the holes and fastened with nuts.

Note that the elastoplastic damper is made of steel, metal, synthetic resin such as plastic, or the like.

〔Example〕

The present invention will be explained below based on embodiments shown in the drawings.

Fig. 1 shows an elastoplastic damper A of the present invention applied to an expansion joint 3 between adjacent structures 1 and 2, in which a plurality of elastoplastic dampers A are applied along the sides of the structures 1 and 2. It is arranged.

In FIG. 2, an elastoplastic damper A is disposed between a receiving portion 4 provided on one structure and the lower end surface of the distal end of a sliding portion 5 of an expansion joint, and is used as a directly coupled damper.

3 and 5 show a first embodiment of the elastic-plastic damper A. FIG.

The elastic-plastic damper A is composed of a cylindrical or substantially cylindrical damper body 12 and a base plate 13, and the damper body 12 and the base plate 13 around the bottom of the damper body 12 are integrally formed. The damper body 12 has a hollow structure, and the thickness of the damper body 12 is determined by the base plate 1.
The third side is formed so that the thickness becomes sequentially thicker. That is, in FIG. 3, the inner peripheral surface of the damper body 12 is tapered, and in FIG. 5, the outer peripheral surface is tapered.

In the elastoplastic damper A shown in FIGS. 3 and 5, a plate 19 is attached to the top of the damper body 12 to close the hollow portion.

4 shows a bending moment diagram of the elastoplastic damper A of FIG. 3, and FIG. 6 shows a bending moment diagram of the elastoplastic damper A of FIG. 5. The horizontal line in the figure indicates the yield region.

A plurality of bolt insertion holes 15 are bored in the base plate 13 in accordance with the mounting positions of the anchor bolts 14. The anchor bolts 14 are inserted into each bolt insertion hole 15, and the nuts 16 are screwed from above the anchor bolts 14. By wearing and concluding the
The base plate 13 is fixed to the upper surface of the receiving part 4 of the structure.

A connecting plate 17 is located at the tip of the damper body 12. A fitting part 18 is bored in the center of the connecting plate 17, and the fitting part 18 fits into the top of the damper main body 12 and is connected with a pin. The connecting plate 17 is fixed to the lower surface of the expansion joint 3 with anchor bolts 14, nuts 16, etc.

7 to 9 show other embodiments of the present invention. In this embodiment, a plurality of fins 20 protrude horizontally or vertically around the damper body 12 to strengthen the damper body 12 against elastic and plastic buckling and to dissipate heat generated by plasticization. are provided integrally. The fins 20 may be provided on the outer peripheral surface of the damper main body 12 as shown in FIG. 7, or may be provided on the inner peripheral surface as shown in FIGS. 8 and 9. Further, it may be provided on both the inner and outer circumferences.

FIG. 10 shows another embodiment of the invention. In this embodiment, the hollow part of the damper body 12 is filled with concrete 21 (or lead 22) to increase the buckling strength of the damper body 12, and to absorb the heat generated by the plasticization of the damper body 12. Crack and post-crack friction (or plastic deformation of lead) improve energy absorption capacity.

In each of the embodiments described above, there is a hole in the center of the base plate 13, but this is a hole in the manufacturing process, and it may be closed later, or a base plate without a hole may be used. do not have. (See FIG. 11) FIGS. 12 to 22 show an embodiment of the second invention. A base plate 12 is provided around both the bottom and top of the damper body 12.
are integrated into one. As in the embodiment described above, the damper body 12 has a hollow structure, and the thickness of the damper body 12 is thicker on both base plate sides than in the middle part of the body 12. In other words, in FIGS. 12, 14, etc., the damper body 1
The outer circumferential surface of 2 is tapered, and in FIG. 16, the inner circumferential surface is tapered. In addition, the 13th
15 and 17 are bending moment diagrams of the elastoplastic damper A shown in FIGS. 12, 14, and 16, respectively, and the horizontal lines in the figures indicate the yield region.

Also in this embodiment, the damper body 12
Fins 20 may be provided on the outer or inner circumferential surface of the damper body 12 (see FIGS. 18 to 20), or concrete 21 or lead 22 may be filled in the hollow part of the damper body 12 (see FIG. 21). Further, as shown in FIG. 22, the upper and lower base plates 13 may have no holes.

[Effects of the Invention] Since the damper body has a cylindrical or substantially cylindrical shape, there is no need to determine the mounting direction.

It has extremely large plastic deformation capacity and high energy absorption capacity.

Since the thickness of the damper body is tapered so that it becomes thicker on the base plate side, the bending strength is increased at the maximum moment part, which is reasonable.

By providing the base plate around the bottom of the damper body, or around the bottom and top, you can choose where to use it as appropriate, and furthermore, by appropriately selecting the taper shape and plate thickness of the damper body, you can freely set the size of the yield load. It is possible and easy to manufacture.

It can be applied to both seismic attenuation devices and seismic isolation devices.

Since the damper body and the base plate are integrated, it is compact and easy to replace.

Since it can be manufactured in one piece by casting or forging, it is easy to manufacture and inexpensive.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an example of application of this invention;
The figure is a side view showing another application example, FIGS. 3 and 5 are sectional views showing the first embodiment of the invention, FIGS. 4 and 6 are bending moment diagrams, and FIGS. 7 to 9 is the second
10 is a sectional view showing the third embodiment, FIG. 11 is a sectional view of an elastic-plastic damper using a base plate without holes, FIGS. 12, 14, 16, and 18 to 22 are cross-sectional views showing the fourth embodiment, FIGS. 13, 15, and 17 are bending moment diagrams, and FIG. 23 is a cross-sectional view showing a conventional example. A... Elastoplastic damper, 1, 2... Building, 3...
...expansion joint, 4...receiving part,
5...Slide part, 12...Damper body, 13
... Base plate, 14 ... Anchor bolt,
15... Bolt insertion hole, 16... Nut, 17...
...Connecting plate, 18... Fitting portion, 19... Plate,
20...Fin, 21...Concrete, 22...
...lead, 23...steel rod, 24...reinforced concrete block.

Claims (1)

[Claims] 1. A hollow, cylindrical or substantially cylindrical damper body, with a base plate integrally provided around the bottom, and the thickness of the damper body tapered so that it becomes thicker on the base plate side. An elastoplastic damper device in which a damper is placed between structures. 2. A hollow cylindrical or substantially cylindrical damper body is integrally provided with a base plate around the bottom and the top, and the thickness of the damper body is tapered so that it becomes thicker on both the base plate sides than the middle part of the body. An elasto-plastic damper device in which a damper formed by the above structure is placed between structures.