JPH0425500Y2 - - Google Patents

Description

[Detailed explanation 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 large earthquakes, it is necessary to increase the rigidity of the structure to make it a rigid structure and increase its resistance to earthquakes. has traditionally been the most common. 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 horizontal force during a major earthquake, thereby increasing rigidity. It is common that

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, although flexible structures can withstand large earthquakes, their natural frequencies are low and internal vibration damping tends to be low, so they are sensitive to strong winds and small to medium earthquakes, making them difficult to compare. Vibrations with large amplitudes can easily occur, causing a problem of reduced comfort.

This idea was created in view of the above circumstances, and its purpose is to suppress vibrations by providing sufficient rigidity to cope with strong winds and small to medium earthquakes, and to provide sufficient rigidity to suppress vibrations in the event of large earthquakes. The object of the present invention is to provide an effective damping wall structure that can reduce the input to the structure by lowering the vibration.

``Means to solve the problem'' This idea is installed between the columns and beams of a structure.
The structure of the damping wall that constitutes the wall of this structure and controls the vibration of this structure includes a flat steel plate and a steel plate that is attached to both sides of the steel plate in a relatively displaceable state. The wall consists of a precast concrete plate covering the
The steel plate is attached between the pillar and the beam by fixing the upper and lower parts to the beam, respectively, and the steel plate is provided with a plurality of parallel slits along the vertical direction, A belt-shaped portion is formed between the slits and on the side edge of the steel plate, and the width of at least some of the belt-shaped portions is different from the width of the other belt-shaped portions. There is.

``Function'' In the structure of the damping wall of this invention, the steel plates that make up the wall resist relatively small external forces such as those caused by strong winds or small to medium-sized earthquakes due to their rigidity, suppressing vibrations. At the same time, since slits are formed in the steel plate, the steel plate yields against large external forces during a major earthquake, reducing the input to the structure.

Since strips of different width dimensions are formed in the steel plate by the slits, when the steel plate is subjected to a large external force, those strips do not yield at the same time but one after another.
The initial stiffness of the steel plate is increased compared to the case where the width dimensions of the band-shaped portions are all the same, and the stiffness of the steel plate exhibits behavior that gradually decreases as deformation progresses.

"Embodiments" Examples of this invention will be described below, but first, the structure of the damping wall, which is the basis of this invention, will be explained with reference to FIGS. 5 to 9.

Figure 5 is a partial elevation view of a building in which the vibration damping wall of this structure is adopted, and symbols 1 and 2 in the figure are columns;
3 and 4 are beams, and 5 is a wall 5 that is installed in the space surrounded by the columns 1 and 2 and the beams 3 and 4 and constitutes the wall of this building. This wall 5 is
A steel plate 6 and two precast concrete plates attached to both the front and back sides of the steel plate 6 (hereinafter referred to as
It is composed of 7 and 7 (referred to as PC version).

The above-mentioned steel plate 6 is a flat plate with dimensions slightly smaller than the space between the columns 1 and 2 and the beams 3 and 4, and has a plurality of (10) slits 8 parallel to each other along the vertical direction. The slits 8 are formed by cutting at intervals, and between the slits 8 and the steel plate 6.
Eleven strips 9, all of which have the same width b, are formed on both side edges of the strip. The upper and lower parts of the steel plate 6 are welded and fixed to the beams 3 and 4 via fixing plates 10, respectively.

As shown in FIG. 6, the above-mentioned PC plates 7, 7 are attached to both sides of the above-mentioned steel plate 6, respectively.
Both sides of the steel plate 6 are completely covered by these PC plates 7, 7. These PC versions 7,7
prevents out-of-plane buckling of the steel plate 6, and
This serves as a fireproof coating for the steel plate 6. The attachment of these PC plates 7, 7 to the steel plate 6 is as follows:
Bolts 13 are inserted into horizontally long holes 11 provided at the upper and lower edges of the steel plate 6, respectively, and holes 12 provided at the center of the steel plate 6 in the height direction. This is done by letting As a result, the steel plate 6 and the PC plates 7, 7 can be relatively displaced, and even when the wall 5 is subjected to horizontal force and the steel plate 6 is deformed, as will be described later.
No external force is applied to the PC versions 7, 7, so that the PC versions 7, 7 are not deformed or destroyed.

For damping walls with the above structure, beam 2 or beam 4
When a horizontal external force is applied to the steel plate 6 and they are relatively displaced, the steel plate 6 is deformed as shown in FIG. 7, for example.
The behavior is as follows. That is, the eighth
As schematically shown in the figure, the belt-shaped portion 9 responds to the external force P.
When the amount of displacement (that is, the amount of deformation of the steel plate 6) is δ, the P-δ curve (stress-strain curve) representing the relationship between the external force P and the amount of displacement δ is as shown in FIG. As is clear from FIG. 9, until the external force P reaches a predetermined magnitude, the steel plate 6 is elastically deformed while exhibiting a certain rigidity, and the amount of displacement δ is
gradually increases, but the steel plate 6 will yield to an external force greater than that and will no longer be able to exhibit its proof strength.

Therefore, according to the wall as described above, when a relatively small external force such as a small to medium earthquake or wind is applied to the building, the initial rigidity of the steel plate 6 sufficiently resists the external force. In addition to being able to suppress vibrations in buildings, steel plates yield and reduce their rigidity when extremely large external forces, such as those caused by large earthquakes, are applied.

The structure of the damping wall, which is the basis of this invention, has been explained above. Next, we will explain the first embodiment of this invention with reference to Figs. 1 and 2, and Figs. 3 and 4. The second embodiment will be explained with reference to the following. In addition,
In both the first and second embodiments, the rigidity of the steel plate against external forces is adjusted by setting the number and spacing of the slits formed in the steel plate of the wall described above. Since the other configurations are the same as those described above, FIG. 1 shows only the steel plate 20 in the first embodiment, and FIG. 3 only shows the steel plate 30 in the second embodiment. to simplify the explanation.
In addition, the broken lines in FIGS. 1 and 3 indicate the steel plates 20 and 3.
0 is deformed by external force P.

First, the steel plate 20 in the first embodiment has a first
As shown in the figure, eight slits 21 are formed at regular intervals, and seven first strips 22 having the same width are formed between the slits. Two second band-shaped parts 23, 23, which are wider than the first band-shaped part 22, are formed on both side edges of. 1st
The width dimension b ₁ of the strip-shaped portion 21 is equivalent to the width dimension b of the strip-shaped portion 9 in the above steel plate 6, but the width dimension b ₂ of the second strip-shaped portion 23 is the width dimension of the first strip-shaped portion 22.
It is said to be about twice that of _b1 .

In this way, two types of belt-like parts 2 with different width dimensions are created.
2 and 23, the external force P applied to this steel plate 20 and the displacement amount δ of the steel plate 20
The P-δ curve representing the relationship with is shown in FIG. In FIG. 2, the broken line represents the P-δ curve of only the wide second band-like portions 23 located on both sides, and the dashed-dotted line represents the P-δ curve of only the first wide band-like portion 22 located on the inside. , and the thick solid line indicates the P-δ curve of the entire steel plate 20 as the sum of them.
In addition, the thin solid line is the P-δ curve in FIG.
For comparison, the P-δ curve is shown for the case where all the width dimensions are the same.

As is clear from FIG. 2, when an external force P is applied to the steel plate 20, the second wide band 23 yields first, and then the first band 22 yields. However, this steel plate 20
The initial stiffness of the entire steel plate 20 is larger than that in the case where the widths of the strips are all the same, and the stiffness of the steel plate 20 decreases in two stages as the deformation progresses. This will further enhance the vibration suppression effect during earthquakes and small to medium earthquakes. Moreover, the magnitude of the external force at the time when the entire steel plate 20 finally yields is the same as in the above case. Therefore, when receiving a large external force during a large earthquake, This makes it possible to effectively reduce input into buildings.

The first embodiment has been described above, and next the second embodiment will be described. Steel plate 30 in this second embodiment
As shown in Fig. 3, a total of eight slits 31 are formed, four each excluding the central part.
The six first strip portions 32 with the same width dimension b ₃ between the slits are also connected to the steel plate 30.
Two second strip portions 33, 33 wider than the first strip portion 32 (width dimension b ₄ ) are provided on both sides of the
Furthermore, a second strip portion 33 is provided at the center of the steel plate 30.
The third band-shaped portion 34 is even wider (width dimension b ₅ )
are said to have been formed respectively.

In this way, there are three types of belt-shaped parts 3 with different width dimensions.
By forming 2, 33, 34,
The P-δ curve of this steel plate 30 is as shown in FIG. In FIG. 4, the broken line is the P-δ curve of the third widest band 34 in the center of the steel plate, and the dashed-dotted line is the P-δ curve of only the second band 33 located on both sides. The dashed dotted line shows the P-delta curve of only the first strip portion 32, and the thick solid line shows the P-delta curve of the entire steel plate 30 as the sum of these curves. In addition, the two thin solid lines compare the P-δ curve in FIG. 9 (the P-δ curve when all the width dimensions of the strip parts are equal) and the P-δ curve of the entire steel plate 20 of the first example. This is what was shown for.

As is clear from FIG. 4, in this second embodiment as well, the steel plate 3
When external force P is applied to
Next, the first belt-like portions 32 yield in order, and therefore the rigidity of the entire steel plate 30 is lower than that of the steel plate 30.
As the deformation progresses, it will decrease in three stages. As a result, the effect of suppressing vibrations during strong winds and small to medium earthquakes is further enhanced than in the first embodiment. Also, in this second embodiment, the magnitude of the external force at the time when the entire steel plate 30 finally yields is the same as that in the case where the slits are provided at equal intervals and in the first embodiment, and in the case of a large earthquake. When a large external force is applied to a building, the input to the building can be effectively reduced.

As explained above, the damping walls of the structures of the first and second embodiments have slits in the steel plate, so that they can suppress vibrations during strong winds and small to medium earthquakes, and suppress vibrations during large earthquakes. It is possible to obtain both input reduction effects at the same time, and by setting the number of slits and the spacing between them to provide strips with different widths, it is possible to obtain both effects when the width dimensions of the strips are all equal. In comparison, the above effects are even more enhanced.

Note that this invention is not limited to the above-mentioned embodiments, and may be modified as appropriate depending on the design conditions, for example, by making the width dimensions of the strip parts more diverse, or by making the width dimensions of the strip parts all different. Of course it's fine to do so.

In addition, in the above embodiment, the slits were formed by cutting the steel plate, but by arranging a plurality of strip steel plates with a slight gap and welding only the upper and lower parts, the slits can be formed by cutting the steel plates. It is also possible to form slits between the shaped steel plates.

``Effects of the invention'' As explained in detail above, the structure of the damping wall of this invention has slits in the steel plates and strips between the slits and on the sides of the steel plates. The rigidity of the steel plate provides a sufficient vibration suppression effect against relatively small external forces during an earthquake, and the steel plate yields and provides an input reduction effect against large external forces during a large earthquake. Moreover, by providing the strips with different width dimensions, the above effect can be further enhanced compared to the case where the width dimensions of the strips are all the same, which is extremely effective. be.

[Brief explanation of drawings]

1 to 4 are diagrams showing an embodiment of this invention. Figures 1 and 2 show the first embodiment. Figure 1 is a front view of the steel plate in the first embodiment, and Figure 2 is a diagram showing the relationship between the external force applied to the steel plate and the amount of displacement. be. Figures 3 and 4 show the second embodiment. Figure 3 is a front view of the steel plate in the second embodiment, and Figure 4 is a diagram showing the relationship between the external force applied to the steel plate and the amount of displacement. It is. Fifth
Figures 9 to 9 show the structure of the damping wall that is the basis of this invention. Figure 5 is a front view showing the general structure of the wall, Figure 6 is a side sectional view, and Figure 7 is this wall. A front view showing a state in which the steel plate in the wall is deformed,
FIG. 8 is a diagram schematically showing the deformation of the steel plate, and FIG. 9 is a diagram showing the relationship between the external force applied to the steel plate and the amount of displacement. 1, 2...Column, 3, 4...Beam, 5...Wall, 7
...Precast concrete version (PC version), 20
... steel plate, 21 ... slit, 22, 23 ... band-shaped part, b ₁ , b ₂ ... width dimension of band-shaped part, 30 ... steel plate, 31 ... slit, 32, 33, 34 ... band-shaped part, b ₃ , b ₄ , b ₅ ...Width dimension of the strip.

Claims (1)

[Scope of utility model registration request] This vibration damping wall structure is installed between the columns and beams of a structure to form the walls of the structure and to control vibrations of the structure, and is made of a flat steel plate and both sides of the steel plate. By fixing the upper and lower portions of the steel plate to the beam, respectively, a wall consisting of a precast concrete plate that is attached so as to be relatively displaceable and covers the steel plate can be installed between the column and the beam. It becomes attached to,
The steel plate is provided with a plurality of slits parallel to each other along the vertical direction, thereby forming strips between the slits and on the side edges of the steel plate, and at least one of the strips is formed in the steel plate. A structure of a damping wall characterized in that the width of one band is different from the width of other band-shaped parts.