JP2003184926A - Elasto-plastic damper coated with paint - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent the occurrence of defects after installing a steel damper, which affects the energy absorption capacity and inspection frequency, by performing a surface treatment on the steel elasto-plastic damper. A plastically deformable portion of a steel elasto-plastic damper such as a honeycomb damper 1 is coated with a highly durable paint film that does not cause damage such as cracks following the deformation during plastic deformation having elongation performance. A coating is formed by enclosing or applying a paint having the above-mentioned properties to this portion. The coating film of the paint is formed by an undercoat as a primary treatment for rust prevention and a topcoat as a secondary treatment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel elasto-plastic damper coated with a paint.

[0002]

2. Description of the Related Art Steel elasto-plastic dampers include those disclosed in Patent Documents 1 and 2, for example. All of these are installed in a structure, and one end is attached to a structure frame such as a pillar or a beam, and the other end is attached to a seismic resistant member such as a brace or an earthquake resistant wall.

Vibration during an earthquake causes relative displacement between the ends of the attached steel elasto-plastic damper. Corresponding to this relative displacement, the damper causes plastic deformation having a hysteresis characteristic for each vibration cycle, and absorbs the vibration energy by an amount of energy corresponding to the area surrounded by the hysteresis curve on the hysteresis curve.

FIG. 1 (a) shows an example of a steel elastic-plastic damper called a honeycomb damper in which hexagonal holes are arranged side by side in a steel plate. FIG. 1 (b) shows a state in which seismic resistant walls 4 are provided on the upper and lower sides of a column-beam structure composed of columns 2 and beams 3, and the honeycomb damper 1 of FIG. 1 (a) is attached between the upper and lower seismic resistant walls 4. There is.

FIG. 2 (a) shows an example of an elasto-plastic damper called a punching metal damper in which a long hole is punched in a steel plate, and FIG. 2 (b) shows this punching metal damper. The state where 5 is attached to the brace 6 in the column-beam frame is shown.

FIG. 3 shows an extremely soft steel damping wall 7 as a steel elastic-plastic damper, and the thickness of the damping wall 7 is 6 to 6.
In order to prevent buckling due to a small stress at 25 mm, stiffeners 8 are put in the vertical and horizontal directions for stiffening. (a) is an elevation view and (b) is a plan view.

FIG. 4 shows an example of a steel elasto-plastic damper called a steel pipe twist type damper, in which (a) is a front view and (b) is a side view. The twisted damper 9 of the steel pipe is installed in the column-beam frame, and the vibration is absorbed by the twisted deformation of the steel pipe.

FIG. 5 shows an example of a steel elasto-plastic damper called a Y-shaped brace damper, in which a Y-shaped brace damper 11 is arranged between the beam 3 and the brace 12.

FIG. 6 shows an example of a steel elasto-plastic damper called a vibration control panel made of a plate member of extremely low yield point steel, in which the vibration control panel 13 is arranged at the column 2 portion. ing.

FIG. 7 shows a slit type damper (reference numeral 1 in the figure).
4) shows an example of a steel elasto-plastic damper.

[0011]

[Patent Document 1] Japanese Patent No. 2508244

[Patent Document 2] Japanese Patent Publication No. 08-026687

[Patent Document 3] Japanese Patent Application No. 05-060270 (No.
7-025160) microfilm

[Patent Document 4] Japanese Patent Application No. 05-068816 (No.
7-034159) microfilm

[Patent Document 5] Japanese Patent Laid-Open No. 08-277651

[Patent Document 6] Japanese Patent Laid-Open No. 07-003145

[Patent Document 7] Japanese Patent Laid-Open No. 04-108573

[Patent Document 8] Japanese Patent Laid-Open No. 62-152570

[0012]

The conventional coating of a steel elasto-plastic damper is only a simple coating with a rust preventive paint or the like, like the steel frame member of a column or beam.

On the other hand, the energy absorption capacity of these steel elasto-plastic dampers depends on the cyclic plastic deformation capacity, and this cyclic plastic deformation capacity is greatly affected by the surface roughness of the steel material and defects such as notches. Due to the deterioration of durability against this repetition, the steel material is fractured early and the planned energy absorption capacity cannot be exhibited.

In view of this situation, when the damper is deformed due to a small-to-medium earthquake, the rust stopper is unable to follow the extension amount and is damaged only by coating with only the rust stopper as before, and the rust developed there. It is feared that the defect due to the above causes a decrease in the energy absorption capability as described above.

In order to prevent this, regular inspections and extraordinary inspections after an earthquake are carried out, but the advantages of steel elasto-plastic dampers, which are originally maintenance-free, are lost. It will be.

The object of the present invention is to prevent the occurrence of defects after the installation of the steel damper, which affects the energy absorption capacity and the inspection frequency, by subjecting the steel elastic-plastic damper to the surface treatment. .

[0017]

A steel elasto-plastic damper coated with a paint according to claim 1 of the present application has a plastically deformable portion which is cracked or the like by following its modification during plastic deformation having elongation performance. It is characterized in that it is not damaged, is wrapped by a coating film of highly durable paint, or is coated with the paint.

As the paint having the above properties, for example, a modified acrylic silicone elastic type resin paint (trade name: Power Silicon # 230) can be used.

The coating with the paint is not necessarily limited to the plastically deformable portion, and other portions may be coated.

According to a second aspect of the invention, in the steel elasto-plastic damper coated with the paint according to the first aspect, the gusset plate portion for mounting the steel elasto-plastic damper also follows its modification during plastic deformation having elongation performance. This is the case where the coating is coated with a highly durable paint that does not cause damage such as cracks, or is covered with the paint.

A third aspect of the invention is a steel elasto-plastic damper coated with the paint according to the first or second aspect, wherein the coating film of the paint is formed by an undercoat as a primary treatment for rust prevention and an overcoat as a secondary treatment. It is characterized by being present.

The surface of the steel elasto-plastic damper cannot be painted in a completely rust-free state by subjecting it to shot blasting or the like in order to ensure finishing accuracy. An undercoat is applied, and then a paint having conformability to deformation is overcoated.

In this case, the undercoat paint having a rust preventive function is, for example, a polyurethane resin anticorrosive primer (trade name: urethane primer PC), and the topcoat paint is the above-mentioned modified acrylic silicone elastic type resin paint (commodity). Name: Power Silicon # 230) can be used.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 8 shows a variation of a coating range of a honeycomb damper 1 as an elasto-plastic damper (which may be wrapped by a coating or may be formed by coating). is there.

FIG. 8 (a) is limited to the plastically deformable portion of the honeycomb damper 1 and follows the modification during plastic deformation having elongation performance of, for example, the above-mentioned modified acrylic silicone elastic type resin coating material. Does not cause damage such as cracks,
This is the case where a coating film with high durability is formed.

FIG. 8 (b) is not limited to the plastically deformable portion, and the range excluding the portion to be attached to the gusset plate (see FIGS. 8 (c) and 8 (d)) for attaching the honeycomb damper 1 is as follows. This is the case where the range of the coating film of the paint is expanded.

FIGS. 8 (c) and 8 (d) show the case where a coating film of the above-mentioned paint is further formed on the mounting portion to the gusset plate 15. However, the coating surface is not applied to the contact surface between the gusset plate 15 and the honeycomb damper 1.

FIG. 9 shows a honeycomb damper 1 used in an experiment for confirming the effect of the present invention, in which the shaded portion in the drawing is covered. The specifications of the coating are as follows: urethane primer PC (trade name) is applied once as an undercoat,
As a top coat, Power Silicon # 230 (trade name) was applied once.

FIG. 10 shows the honeycomb damper 1 in the experiment.
When the upper part of the honeycomb damper 1 is deformed to the left side, which corresponds to the-cycle of Fig. 11,
When it is transformed to the right, it corresponds to + cycle.

FIG. 11 shows a cycle until cracks are generated in the honeycomb damper when a load is repeatedly applied to the honeycomb damper as a test piece.

As a result, the deformation followability in the selected coating specifications is high even for repeated large plastic deformation, and although the coating is lifted up (wrinkles) after the damper cracks, the coating is applied until the damper is broken. No cracks in the material were confirmed.

[0032]

According to the present invention, the plastic deformation capability can be guaranteed by preventing the occurrence of surface defects such as rust that affect the energy absorption capability of the steel elastic-plastic damper. This is especially effective when a damper is attached to the outside when reinforcing the seismic control.

Therefore, the frequency of inspections can be reduced, and in some cases, maintenance can be completely released.

[Brief description of drawings]

FIG. 1 shows a honeycomb damper as an elasto-plastic damper, wherein (a) is a front view and (b) is a front view showing a state of being mounted in a column / beam frame.

FIG. 2 shows a punching metal damper as an elasto-plastic damper, (a) is a front view, and (b) is a front view showing a mounting state in a column / beam frame.

[Fig. 3] Fig. 3 shows an extremely soft steel damping wall as an elasto-plastic damper, (a) is a front view and (b) is a horizontal sectional view.

4A and 4B show a steel pipe twist type damper as an elastic-plastic damper, wherein FIG. 4A is a front view and FIG. 4B is a side view.

FIG. 5 is a front view showing a mounted state of a Y-shaped brace damper as an elastic-plastic damper.

FIG. 6 is an elevation view showing a state where a vibration control panel as an elasto-plastic damper is incorporated in a column.

FIG. 7 is a front view showing a slit type damper as an elastic-plastic damper.

[Fig. 8] Fig. 8 is a perspective view showing a variation of a coating range of a honeycomb damper as an elasto-plastic damper.

FIG. 9 is a front view of the honeycomb damper used for the experiment.

FIG. 10 is a front view showing a deformed state of the honeycomb damper of FIG.

FIG. 11 is a graph showing a cycle until cracks occur in the honeycomb damper when a repeated load is applied to the honeycomb damper of FIG.

[Explanation of Codes] 1 ... Honeycomb damper, 2 ... Column, 3 ... Beam, 4 ... Seismic wall, 5
… Punching metal damper, 6… Brace, 7… Extremely mild steel damping wall, 8… Stiffener, 9… Twisted steel pipe damper, 1
0 ... Steel pipe, 11 ... Y type brace damper, 12 ... Brace, 13 ... Vibration control panel, 14 ... Slit type damper, 15
… Gusset plate

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) F16F 15/02 F16F 15/02 Z (72) Inventor Nobuyuki Miyagawa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Ken Incorporated Co., Ltd. (72) Inventor Tadashi Nasu 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. F-term (Reference) 3J048 AA02 AC06 BC08 BC09 BD01 EA38 3J066 AA01 AA26 BA04 BB01 BC03 BC07 BD05 BE06 BE08

Claims (3)

[Claims] 1. A plastic-deformable portion of a steel elasto-plastic damper is wrapped with a coating film of highly durable paint that does not cause damage such as cracks following plastic deformation during plastic deformation having elongation performance. Alternatively, a steel elasto-plastic damper covered with a paint, characterized in that the paint is applied to the portion. 2. The mounting portion of the steel elasto-plastic damper to the gusset plate is also wrapped with the coating film of the coating, or the coating is applied to the portion as well. Steel elasto-plastic damper coated with paint. 3. The steel bullet coated with the paint according to claim 1, wherein the coating film is formed by an undercoat as a primary treatment for rust prevention and an overcoat as a secondary treatment. Plastic damper.