JPH0412220Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is used to construct the walls of architectural and civil engineering structures, and also to control vibrations caused in these structures due to external forces such as earthquakes or wind. This relates to the structure of the damping wall that can be obtained.

"Prior Art and Its Problems" As is well known, in order to make a structure resistant to external forces such as earthquakes and wind, it is necessary to increase the rigidity of the structure and make it a rigid structure, which increases its resistance to external forces. Traditionally, the most common method was to increase In conventional rigid structures, load-bearing walls and braces are fixedly installed between columns and beams, and the load-bearing walls and braces bear part of the external force (especially horizontal force during earthquakes). Generally, the rigidity is increased.

By the way, a rigid structure with high rigidity is not necessarily desirable because the seismic force is directly transmitted to the structure, which increases the input during an earthquake.For this reason, lightweight and flexible structures are used in skyscrapers etc. (flexible structure) is becoming common. However, flexible structures have a low natural frequency and tend to have low internal vibration damping, so they can relatively easily generate vibrations with large amplitudes due to the influence of external forces. As a result, the decline in livability was sometimes considered a problem.

Therefore, in recent years, consideration has been given to vibration damping structures in which a device is installed inside the structure to absorb vibration energy, and when vibration occurs, the device absorbs the vibration energy and suppresses the vibration. . So far, for example, a liquid storage tank is installed on the roof of a building to absorb vibration energy through the vibration of the liquid, and a weight block is installed on the roof to utilize its inertia to absorb vibration energy. Various vibration damping devices have already been proposed, such as those that absorb vibrations.

However, all of the above-mentioned vibration damping devices that have been proposed to date require sufficient installation space on rooftops, etc., so they may not be applicable depending on the scale and area of the structure. This requires a large number of accessory devices such as various control devices and sensors, making the device complicated and large-scale, which poses a problem in terms of cost.

This invention was made in view of the above circumstances, and its purpose is to provide a means for controlling and effectively suppressing the vibration of a structure without using a vibration damping device as described above. It is in.

``Means for solving the problem'' This idea is a vibration damping wall structure that is installed between columns and beams of a structure to form the walls of this structure and to control vibrations of this structure. The lower part of the precast concrete wall that can bear part of the external force applied to this structure is fixed to the beam, and the piston and the piston are moved to the center position of the upper part of the wall. A cylinder containing an elastic member for braking is fixed, and one end of a connecting member extending along a beam located at the top of this wall is connected to the piston, and the other end of the connecting member is connected to the beam. By fixing the upper part of the wall to the end of the beam, the upper part of the wall is elastically connected to the beam so that it can be moved relative to the beam in its length direction.

``Function'' The structure of the damping wall of this invention is to elastically connect the upper part of the precast concrete wall body, which is an earthquake-resistant element that is fixedly installed between columns and beams, to the beam. This allows the wall to bear a portion of the external force and exhibit an earthquake resistance effect, as well as a vibration damping effect.

In other words, in this structure, when an external force acts on the structure, the upper part of the wall and the beam are displaced relative to each other, but this displacement is suppressed by the elastic force of the elastic member built into the cylinder, and this Earthquake input to structures is reduced.

``Example'' Below, an example of this invention will be shown in Figures 1 to 9.
This will be explained with reference to the figures.

Fig. 1 is a partial elevation view of a building in which the structure of this embodiment is adopted, in which reference numerals 1 and 2 are pillars standing next to each other, and numeral 3 is the pillars 1 and 2. The beam 4 spanned between them is a similar beam located on the upper floor of the beam 3. These pillars 1,
2. Both beams 3 and 4 are made of steel (H-shaped steel in this example).

In a space surrounded by these pillars 1, 2 and beams 3, 4, a wall 5 is installed which constitutes the wall of this building and bears external forces. This wall 5 is made of precast concrete and has dimensions slightly smaller than the above-mentioned space, and is installed with a slight gap secured between the columns 1 and 2 and the beams 3 and 4. ing. Note that the gap is closed with an interior material or a fireproof covering material (not shown).

As shown in FIG. 1, braces 6 and 7 made of steel plates are embedded in the wall 5 from both sides of the lower part to the center of the upper part, and a plate connects the upper ends of the braces 6 and 7. The lower part of the plate 8 is buried, and the upper part of the plate 8 is exposed in a notch 9 formed at the center of the upper part of the wall 5. And this wall body 5 is
The lower part of the wall 5 is fixed to the beam 3 by welding the lower ends of braces 6 and 7 to the upper flange 3a of the beam 3, but the upper part of the wall 5 is relative to the beam 4. They are elastically connected in a movable manner.

That is, a cylinder 10 is fixed to the upper edge of the plate 8 at the center of the wall 5. This cylinder 10, as shown in detail in FIGS. 2 to 4, has a hollow rectangular cylindrical shape, and its interior is divided into two by a partition wall 11. Pistons 12a, 12b that are movable in the length direction of this cylinder 10 are arranged, and these pistons 12a, 12b
Coil springs (elastic members) 13a, 13b are arranged between the partition wall 11 and the pistons 12a, 12b, respectively, at both ends of the coil springs 13a, 13b. Movement of the pistons 12a and 12b is braked by the piston 13b. Further, a viscous fluid 14 is sealed between the pistons 12a and 12b.
4 can flow through holes 15 formed in the partition wall 11 as the pistons 12a, 12b move.

Each piston 12a, 12 in the cylinder 10
The proximal ends of connecting members 16a and 16b are welded and connected to b, respectively. These connecting members 1
6a and 16b are long steel frames with a T-shaped cross section as shown in FIGS. 3, 5 to 7, and each extend below the beam 4 and along the beam 4, Their tips (the left end of the connecting member 16a and the right end of the connecting member 16b in FIG. 1)
In the vicinity of columns 1 and 2, fixed plates 17a,
They are each fixed to the lower flange 4a of the beam 4 via 17b. Moreover, the connecting member 16a,
The middle portion of the beam 16b is supported from the beam 4 by bolts 19 and nuts 20 at a predetermined interval through an elongated hole 18 formed in the lower flange 4a of the beam 4.

As described above, the upper part of the wall 5 has the cylinder 10 and the coil springs 13a, 13 at the central position.
b, pistons 12a, 12b, connecting member 16a,
It is elastically and relatively movably connected to the beam 4 via 16b. When an external force is applied to the columns 1, 2 and beams 3, 4, the connecting members 16a, 16b are displaced together with the beams 4 relative to the wall 5, and these connecting members 1
6a and 16b are also designed to be able to expand and contract relative to the beam 4.

By elastically connecting the upper part of the wall 5 to the beam 4 as described above, this structure can exhibit earthquake resistance and vibration damping effects at the same time.
Its operation will be explained with reference to FIG.

Figure 8A shows the normal state in which no external force is applied to this building. In this state, columns 1 and 2 are vertical, and wall 5 is in contact with columns 1 and 2 and beams 3 and 4. There is a predetermined gap between them.

From this state, if a horizontal external force such as an earthquake force or wind force is applied from the left in the figure as shown in FIG. 8B, the beams 3 and 4 will undergo interstory displacement.
Since the lower part of the wall 5 is fixed to the beam 3, there is no relative displacement between the beam 3 and the wall 5, but the upper part of the wall 5 is elastically connected to the beam 4. Therefore, the beam 4 is displaced relative to the wall 5, and the connecting members 16a and 16b, whose one ends are fixed to the beam 4, are also displaced relative to the wall 5 together with the beam 4. Displace. That is, the connecting member 16a moves so as to push the piston 12a toward the inside of the cylinder 10, and the connecting member 16b moves so as to pull the piston 12b out of the inside of the cylinder 10.

At this time, the piston 12a compresses the coil spring 13a, and the piston 12b stretches the coil spring 13b, so those coil springs 13a, 13
The connecting member 16a contracts and the connecting member 16b expands in response to the reaction force due to the elastic force b. At the same time, the coil springs 13a and 13b also elastically deform and expand and contract, so that the load-bearing wall is directly and fixedly fixed to the beam 4. The rigidity is moderately weakened compared to the conventional case where the building is provided with a wall, and the input of external force to the building is reduced. Furthermore, the piston 12a,
12b is braked, and the coil spring 13
The vibrations of a and 13b are quickly attenuated, and therefore, the vibrations caused by external forces in this building are effectively suppressed and absorbed, resulting in a vibration damping effect.

By designing the connecting members 16a and 16b to yield before the shear yielding of the wall 5, this structure can maintain its proof strength even after yielding and can follow large deformations, allowing sufficient It also has an earthquake-resistant effect. This will be explained with reference to FIG. 9, which shows the restoring force characteristics of this structure. In FIG. 9, the broken line is the P-delta curve of a conventional load-bearing wall that is simply fixedly provided, and the solid line is the P-delta curve of the above structure. Point Qy in the figure is the yield point of the connecting members 16a, 16b in this structure. This figure shows that while conventional load-bearing walls are destroyed early after yielding (x points in the figure), this structure has a spring constant (i.e., stiffness) that is moderate compared to conventional load-bearing walls. It can be seen that even after yielding, although it undergoes significant deformation, it does not lose its yield strength.

In the above embodiment, the coil springs 13a and 13b are provided in the cylinder 10, but a disc spring or other elastic member may be used instead of the coil spring. When a plurality of disc springs are used in a stacked manner, the viscous fluid 14 may be omitted because a damping effect occurs due to the friction between the disc springs.

Moreover, in the above, the inside of one cylinder 10 is divided into two parts by the partition wall 11, and two pistons 12a, 1
2b, the cylinder itself may be divided into two parts and each part may be separately fixed to the wall 5.

``Effects of the invention'' As explained in detail above, the structure of the damping wall of this invention has a structure in which the upper part of the wall is elastically connected to the beam, so that the input to the structure during an earthquake is reduced. is reduced, and vibrations are effectively suppressed, so that a sufficient seismic resistance effect can be exhibited, and at the same time, a vibration damping effect can also be exhibited. Therefore, a vibration damping structure can be easily realized without requiring a special installation space unlike when using a conventional vibration damping device, and without significantly increasing costs.
There is an advantage.

[Brief explanation of drawings]

Figures 1 to 9 are diagrams showing an embodiment of this invention, in which Figure 1 is a partial elevation view of a building with the structure of this embodiment, and Figure 2 is an enlarged view of the part shown in Figure 1. , FIG. 3 is a view taken along the - line in FIG. 2, FIG. 4 is a view taken along the - line in FIG. Fig. 7 is a view taken along the - line in Fig. 6, and Fig. 8 is a diagram for explaining the operation of this structure. FIG. 9 is a diagram showing the state in which an external force is applied, and FIG. 9 is a diagram showing the restoring force characteristics of this structure. 1, 2...Column, 3, 4...Beam, 5...Wall, 1
0...Cylinder, 12a, 12b...Piston,
13a, 13b...Coil spring (elastic member), 1
6a, 16b...Connection members.

Claims (1)

[Scope of utility model registration request] A damping wall structure that is installed between the columns and beams of a structure to form the walls of the structure and to control the vibrations of the structure. The lower part of a wall made of precast concrete that can bear the load is fixed to the beam, and a cylinder containing a piston and an elastic member that brakes the movement of the piston is fixed at the center of the upper part of the wall. By connecting one end of a connecting member extending along a beam located at the top of the wall to the piston, and fixing the other end of the connecting member to the end of the beam, the wall can be connected to the piston. A damping wall structure characterized in that an upper part of the beam is elastically connected to the beam so as to be relatively displaceable in the longitudinal direction thereof.