JPH04108757U - building steel bar damper - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a steel rod damper for buildings that does not require maintenance, does not generate nonlinear vibrations, and is inexpensive. [Configuration] Upper fixed base 3 installed on superstructure 1
A lower fixed base 12 is installed on a foundation 10, with a tension rod 5 loosely passing through each of the opposing side plates 4, and a compression bomb 9 interposed between the end of each tension rod 5 and the side plate 4. The upper end of the steel rod 13 erected upright was connected to the opposing ends of both the tension rods 5, 5 via a pin joint 14.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a steel rod damper for seismic isolation or damping buildings.

0002

[Conventional technology]

Figure 5 shows a steel rod damper in a conventional seismically isolated building, with building foundation A and soil foundation B. A steel rod C is installed between the building foundation and the ground foundation through a spherical bearing D. When an inter-story displacement δ occurs during the process, the steel rod undergoes plastic deformation and bends, which absorbs the vibration energy of the building. Energy is consumed by the plastic deformation of the steel bar as hysteresis absorbed energy, and the steel bar is used as a damper. This means that he worked as a

0003 This steel rod damper maintains a constant distance between the building foundation and the soil foundation, so When the steel bar is deformed, the steel bar will be in the installed state shown in Figure 6 at the spherical bearing part. By sliding as shown in Fig. 7, there is no axial deformation. It is configured so that only bending deformation occurs.

0004

[Problem that the idea aims to solve]

The conventional steel rod damper mentioned above uses spherical bearings to slide the steel rod, so it is difficult to build. In order for the spherical bearing to function satisfactorily during the life of the product, it is necessary to prevent rust from forming. There is no need to carry out maintenance, and also for installing steel rods and spherical bearings. requires precise processing and is costly. Also, there is some gap between the steel rod and the spherical bearing. This creates a gap between the steel rod and the spherical bearing due to the vibration at the micro-vibration level. This causes a state of neither contact nor collision, resulting in nonlinear vibration, which is undesirable.

[0005] The present invention was proposed in view of the problems of the above-mentioned prior art, and its purpose is There are no parts that require maintenance, and there is no nonlinear vibration. The purpose of the present invention is to provide a steel rod damper for buildings that is also highly economical.

[0006]

[Means to solve the problem]

In order to achieve the above object, the steel bar damper for buildings according to the present invention A tension rod is loosely inserted through the opposing side plates of the upper fixed base installed on the When a compression bullet is interposed between the end portion passing through each side plate of the end portion and each side plate, , the upper end of the steel rod erected from the lower fixed base installed on the foundation and each of the above-mentioned tension rods. The opposing end portions are pin-jointed.

[0007]

[Effect]

Figure 4 shows the correlated deformation of the lower fixed base and the upper end pin joint of the steel rod, that is, the deformation of the steel rod. The relationship between the shape and shear force of the steel bar, and the correlation between the pin joint part of the steel bar and the upper fixed base. This figure shows the relationship between the shape (mostly the deformation of compression springs) and the axial force generated in the tension rod. As is clearer, a steel bar yields when shear force is applied above a certain level, and then The increase in shear force is small. Therefore, the figure is schematically shown bilinearly. By tightening the opposing compression rods, the tension rod introduces a small amount of tension force as an initial stress. However, in FIG. 4, this initial stress is removed. Then a steel rod The shear force entering and the axial force entering the tension rod are equal, and the lower fixed base and the upper fixed base The interlayer deformation of is the sum of the deformation of the steel rod and the deformation of the compression spring. So, with the lower fixed base The relationship between the correlated deformation of the upper fixed base and the shear force entering the steel rod is obtained as shown in Figure 4. It will be done.

[0008] When correlated deformation occurs between the lower fixed base and the upper fixed base, the tension on one side The rod is pulled and the compression bullet is compressed, causing bending deformation of the steel rod. Furthermore, interlayer deformation When this occurs, the steel rod begins to undergo plastic deformation, so the increase in force entering the steel rod becomes smaller. the Therefore, the force entering the tension rod does not increase much. The steel bar moves vertically while undergoing horizontal deformation. However, this deformation is caused by the compression bullet being oblique to the axis of the tension rod. It follows by deforming itself.

[0009]

【Example】

FIG. 1 shows an embodiment of the present invention, in which an upper part is fixed to an upper structure 1 with bolts 2, etc. A pair of opposing side plates 4 vertically installed on the fixed base 3 are provided with a transparent material having a diameter larger than that of the tension rod 5. A hole 6 is bored, and a tension rod 5 is loosely inserted into the through hole 6 of each side plate 4. Between the seat plate 8 and the side plate 4, which are fitted into the end threaded portion and supported by the nut 7. A compression bullet 9 is interposed.

0010 On the other hand, a steel rod 13 is attached to a lower fixed base 12 fixed to the lower foundation 10 with bolts 11 etc. is erected, and the upper end of the steel bar 13 and the opposing ends of the pair of tension bars 5 are pin-connected. They are joined by a portion 14 and are rotatable. The illustrated embodiment is configured as described above, so that in the event of an earthquake, etc. As shown, when interlayer displacement occurs between the upper fixed base 3 and the lower fixed base, the piece The tension rod 5 on the side pulls the steel rod 13 while compressing the compression bullet 9, and the steel rod 13 is bent. Ru. At this time, the steel rod 13 is deformed downward, but the compression bullet 9 is deformed diagonally. By making the tension rod 5 oblique, it is possible to follow the deformation of the steel rod 13. Then When the steel bar 13 undergoes plastic deformation, the hysteresis absorbed energy at that time is consumed and the steel rod 13 undergoes plastic deformation. You will be working as a manager.

[0011] Note that the tension rod 5 may be constructed of a wire, and the steel rod damper may be constructed as shown in FIG. In addition to the ones shown in Figure 2, a tension rod is also placed in the direction perpendicular to the page, and the tension rod is connected in all four directions. It is also possible to attach it in both directions so that it can follow deformation in two directions. FIG. 3 shows an example of using the steel rod damper in a seismically isolated building, where the upper building 15 is connected to the foundation 1. The steel rod damper is supported by a laminated rubber 17 on top of the upper fixed base 3. A lower fixed base 12 is attached to a foundation 16 in a building 15.

0012

[Effect of the idea]

Since the steel rod damper according to the present invention is constructed as described above, it is different from the conventional steel rod damper. There are no parts like dampers that rust and require maintenance, and there is no rattling. Since there are no parts that cause vibration, non-linear vibrations at the micro-vibration level do not occur. Furthermore, since there are no parts that require precision machining, costs are reduced.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of a steel rod damper according to the present invention.

FIG. 2 is a front view showing the operating state of the steel rod damper.

FIG. 3 is a front view showing the steel rod damper in use.

FIG. 4 is a diagram showing the relationship between deformation and force of each part of the steel bar damper.

FIG. 5 is a longitudinal sectional view showing a conventional steel rod damper.

FIG. 6 is a longitudinal cross-sectional view showing a spherical bearing portion of the conventional steel rod damper.

FIG. 7 is a longitudinal cross-sectional view showing the state of the spherical bearing portion when the steel rod damper is deformed.

[Explanation of symbols]

1 Superstructure 2 Upper fixed base 4 Side plate 5 Tension rod 6 Through hole 9 Compressed ammunition 10 Basics 12 Lower fixed base 13 Steel rod 14 Pin joint

Claims (1)

[Scope of utility model registration request] Claim 1: A tension rod is inserted loosely through opposing side plates of an upper fixed base provided in an upper structure, and a tension rod is compressed between an end of each tension rod passing through each side plate and each side plate. A steel rod for a building, which is equipped with an ammunition and is formed by pin-joining the upper end of the steel rod erected from a lower fixed base provided in the foundation and the opposite end of each of the tension rods. damper.