JP3988259B2 - Building vibration control structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration damping structure for a building, and more particularly, to effectively use a space for arranging stairs to significantly improve the earthquake resistance of the whole building without reducing the original space for use. Concerning structure.
[0002]
[Prior art]
Conventionally, building damping structures using Y-shaped braces and damping studs are known. Small yield strength members built into these braces and studs are quickly yielded, and vibration energy such as earthquakes is plasticized. The building is converted to energy to control the building. However, since these Y-shaped braces and damping damping columns are incorporated between the upper and lower beams, the layout of openings such as doorways and passages becomes difficult.
[0003]
In view of this, the present applicant has proposed, as Japanese Patent Application Laid-Open No. 10-102682, a damping structure that can facilitate the layout of the opening by configuring a part of the length of the steel beam with a small strength member. did.
[0004]
[Problems to be solved by the invention]
However, in the vibration damping structure of a building in which a part of the length direction of the conventional steel beam is composed of a small strength member, the four corners of the building are considered in consideration of the exchangeability of the small strength member deformed after the occurrence of an earthquake. A steel beam provided with the small strength member is aligned and arranged in the hole portion. However, although the low-strength members can be easily replaced by the atrium part in this way, the aerial part becomes a major limitation in the plan plan and the effective floor area is reduced, and the original utilization space such as a living space or office space is reduced. There was a problem that would become narrower.
[0005]
Therefore, in view of the conventional problems, the present invention provides a building damping structure that effectively absorbs vibration without reducing the original space for using the building even when a small strength member is used. The purpose is to do.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a vibration damping structure for a building according to claim 1 of the present invention exposes a steel beam surrounding a stairs provided in a portion facing the outside of the building from the building, and A small strength member is interposed in a part of the beam, and vibration energy input to the building is converted into plastic energy of the small strength member.
[0007]
In the building damping structure according to claim 2 of the present invention, the staircase is formed integrally with a staircase body and a landing, and at least one of the landings facing each other with the staircase body interposed therebetween is provided via an expansion joint. It is characterized by being connected to the building frame.
[0009]
The operation of the present invention will be described below with the above configuration. Claim 1 converts vibration energy input to the building into plastic energy by a small strength member provided on the steel beam, and the vibration energy is effectively absorbed during this conversion. Therefore, the vibration of the building can be attenuated, and the vibration control function of the building can be significantly improved. At this time, since the steel beam provided with the small strength member surrounds the stairs provided in the building, the steel beam can be easily exposed using the installation space of the stairs. . Therefore, it is easy to replace the small strength member deformed by vibration.
[0010]
Further, when the steel beam is exposed and provided so as to facilitate the replacement of the small strength member in this way, the steel beam is used for the stairs that are naturally provided in the building, that is, using the stairs installation space necessary for the building. Since it can be installed, there is no need to provide an extra space for installing the small strength member, and the use space of the original building, that is, the living space and office space should be reduced. In addition, the vibration of the building can be effectively absorbed.
[0011]
Here, when the stress is generated in the building frame due to the input of vibration caused by earthquakes, strong winds, etc. with the above small strength member, it yields earlier than other materials and the stress exceeds the yield strength, A member with small proof strength that produces hysteresis damping performance due to elasto-plastic behavior and exhibits a damping effect.
[0012]
Examples of the small yield strength member include low yield point steel. As the recommended low yield point steel, for example, BT-LYP100 or BT-LYP235 (both trade names manufactured by Nippon Steel Corporation) and equivalents thereof can be employed. Incidentally, the former yield stress σy is 1.0 (t / cm ² ), the breaking stress σu is 2.4 (t / cm ² ), and the latter yield stress σy is 2.4 (t / cm ² ), The breaking stress σu is 3.5 (t / cm ² ). In addition to the low yield point steel, a metal such as ordinary steel or aluminum can be used as the material for the small strength member.
[0013]
In addition , since the steel beam that provides the small strength member is exposed from the building, the staircase is provided in a portion facing the outside of the building, so that the small strength member provided on the steel beam is also exposed. In combination with the fact that the stairs face the outside, the small strength member can be exchanged from the outside of the building. Accordingly, the replacement work of the small strength member is simplified and can be replaced in a short time, so that the repair work can be shortened and labor can be saved.
[0014]
Furthermore, in claim 2 , the staircase is integrally formed with a staircase body and a landing, and at least one of the landings facing each other across the staircase body is coupled to the building frame via an expansion joint. Thus, relative movement between the building and the stairs is allowed, and it is possible to prevent the swing of the building from being input to the stairs and destroying the stairs. Therefore, it is possible to secure a stairway as an evacuation passage even when an earthquake occurs.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 5 show a vibration control structure of a building according to an embodiment of the present invention. FIG. 1 is a longitudinal front view of the building, FIG. 2 is a cross-sectional plan view of the building, FIG. FIG. 5 is an enlarged sectional view of a portion A in FIG. 4.
[0016]
That is, the building 10 to which the vibration damping structure of the present embodiment is applied includes a ground frame 10a and an underground frame 10b as shown in FIG. 1, and the ground frame 10a is constructed as an S structure and the underground frame 10b. Is constructed as SRC or RC. The vibration damping structure of the present embodiment is used for the above-mentioned ground frame 10a, and is configured by providing a link member 14 as a small strength member on the steel beam 12 at a specific portion of the frame 10a. The link material 14 is formed of a metal capable of plastic deformation such as low yield point steel, ordinary steel material, and aluminum, and has a function of converting vibration energy input to the building 10 into plastic energy of the link material 14; It exhibits a damper performance that yields hysteresis damping performance due to elastoplastic behavior from the time when the yield surpasses other materials and the stress exceeds the yield strength. The link member 14 is shown as a black triangle in FIGS.
[0017]
The building 10 is formed in a rectangular shape in plan view, and evacuation stairs 16 facing the outside of the building 10 are provided at the four corners of the ground frame 10a of the building 10 as shown in FIG. That is, as shown in FIG. 3, flat rectangular staircase installation spaces S formed by being fitted into the housing by dimensions corresponding to one span of the steel beam 12 are provided at the four corners of the ground frame 10a. An evacuation staircase 16 is installed in S. Therefore, in the stair installation space S, the steel beams 12a and 12b for one span are exposed in the vertical and horizontal directions so as to surround the two outer surfaces of the space S and are directly connected to each other.
[0018]
Here, the exposed steel beams 12a and 12b are used as the above-described specific portions of the steel beams 12a, 12b in a part in the length direction, that is, in this embodiment, as shown in FIG. The link member 14 is inserted into the central portion of 12a and 12b and joined together.
[0019]
The evacuation staircase 16 is composed of a staircase body 18 and landings 20 and 20a, and one landing 20 that is in an opposing relationship across the staircase body 18 corresponds to the floor 22 of each floor, that is, the staircase of the ground frame 10a is installed. The other landing 20a is fixed to a steel beam 12b disposed in the middle of the floor, provided corresponding to the steel beam 12 facing the space S.
[0020]
As shown in FIG. 5, the one landing 20 is connected to the ground frame 10 a via an expansion joint 24. The expansion joint 24 includes a coil spring 24c interposed between the mounting end of the landing 20 and the brackets 24a and 24b fixed to the ground frame 10a, and the two considering the relative movement of the landing 20 with respect to the ground frame 10a. And a cover 24d covering the gap. In FIG. 5, an evacuation door 28 is provided above the landing 20 on the frame wall to which the landing 20 is attached.
[0021]
With the above structure of the vibration damping structure for a building according to the present embodiment, the link material 14 is provided in a part of the steel beams 12a and 12b exposed in the staircase installation space S of the building 10, and the link material 14 inputs the link material 14. Therefore, the vibration energy can be effectively absorbed to attenuate the vibration of the building 10, and thus the building 10 can be damped.
[0022]
At this time, the steel beams 12a and 12b provided with the link member 14 surround the evacuation staircase 16 provided in the building 10. Therefore, the steel beams 12a and 12b are used by utilizing the installation space of the staircase. 12b can be reasonably exposed. Therefore, it becomes easy to replace the link member 14 deformed by vibration.
[0023]
Further, when the steel beam 12 is provided so as to facilitate the replacement of the link member 14 as described above, the steel beam 12 uses the evacuation stairs 16 provided in the building 10, that is, the stair installation space S necessary for the building 10. Therefore, it is not necessary to provide an extra space for installing the link member 14 and, in turn, reduce the original use space such as the living space and office space of the building 10. Therefore, the vibration of the building 10 can be effectively absorbed.
[0024]
Further, in the present embodiment, the evacuation stairs 16 are provided at the four corners facing the outside of the building 10 and the steel beams 12a and 12b on which the link material 14 is provided are exposed from the building 10, so that the steel beam The link material 14 provided in 12a and 12b can also be left exposed, and in combination with the escape stairs 16 facing outward, the link material 14 can be replaced from the outside of the building 10. Can be done. As described above, the replacement work of the link member 14 is simplified and can be replaced in a short time, so that the construction period of the repair work can be shortened and the labor can be saved.
[0025]
Here, the escaping stairs 16 are arranged such that the landings 20 and 20a face each other, and one of the landings 20 is coupled to the ground frame 10a via the expansion joint 24. Therefore, the expansion joint 24 and the evacuation stairs 16 Relative movement is allowed. For this reason, even when the building 10 is largely swung due to the occurrence of an earthquake, it is possible to prevent a large load from being input to the evacuation staircase 16 due to the swinging on the building 10 side to be destroyed. Therefore, even when evacuating from the building 10 in the event of an earthquake, it is possible to secure a staircase as an evacuation passage.
[0026]
By the way, in this embodiment, the said evacuation staircase 16 is provided in the four corner parts of the building 10, and the link material 14 is provided in the steel beam 12a, 12b exposed to the installation space S of these evacuation staircases 16, and a staircase part is controlled. Although the structure is disclosed, the staircase having the vibration damping structure is not limited to this, and it is of course desirable to install the staircase in the corner portion in this way, but the formation is made according to the shape and scale of the building 10. The part can be changed as appropriate. For example, when the building 10 is relatively large as shown in FIG. 6, it is installed at six locations including the case where it is formed at the center of both sides, and the building 10 is relatively small as shown in FIG. In such a case, two places may be provided at both ends thereof. Of course, the stairs may be formed inside the building 10. Moreover, although the case where the ground frame 10a to which the above-described vibration damping structure is applied is an S structure, it is disclosed, but other structure types such as an SRC structure may be used.
[0027]
【The invention's effect】
As described above, in the vibration control structure for a building according to claim 1 of the present invention, a small strength member is interposed in a part of the steel beam surrounding the stairs, and this small strength member adds to the building. The vibration energy that is input is converted into plastic energy, and at the time of this conversion, vibration energy is effectively absorbed to attenuate the vibration of the building, and the vibration control function of the building can be significantly improved. At this time, since the steel beam provided with the small strength member surrounds the stairs provided in the building, the steel beam is easily exposed using the installation space of the stairs. be able to. Therefore, the replacement work of the small strength member deformed by the vibration can be facilitated.
[0028]
And, since the steel beam is exposed and provided so as to facilitate the replacement of the small strength member in this way, it can be installed using the installation space of the stairs necessary for the building, so the small strength member is installed. Therefore, it is not necessary to provide an extra special space, and thus, vibrations of the building can be effectively absorbed without reducing the original use space of the building.
[0029]
Further , the staircase is provided in a portion facing the outside of the building, the replacement work of the small strength member can be performed from the outside of the building, and the steel beam provided with the small strength member is exposed from the building. Therefore, the small strength member provided on the steel beam can be exposed. In this way, by exposing the small strength member, coupled with the fact that the stairs face the outside, the replacement work of the small strength member is further simplified and can be replaced in a short time. This makes it possible to shorten the repair work period and save labor.
[0030]
Furthermore, in claim 2 , the staircase is integrally formed with a staircase body and a landing, and at least one of the landings facing each other across the staircase body is coupled to the building frame via an expansion joint. Allows relative movement between the building and the stairs. For this reason, it is possible to prevent the swinging of the building from being directly input to the stairs, and it is possible to secure the stairs as an evacuation passage even when evacuating from the building.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view of a building to which a vibration damping structure of the present invention is applied.
FIG. 2 is a cross-sectional plan view of the building of FIG.
FIG. 3 is a three-dimensional view showing a staircase portion of the building of FIG. 1;
4 is a cross-sectional front view of the staircase portion of FIG. 3;
5 is an enlarged cross-sectional view of a portion A in FIG.
FIG. 6 is a plan view of a building showing another embodiment of the vibration damping structure of the present invention.
FIG. 7 is a plan view of a building showing still another embodiment of the vibration damping structure of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Building 12, 12a, 12b Steel beam 14 Link material 16 Evacuation stairs 18 Stair body 20, 20a Landing place 24 Expansion joint

Claims (2)

A steel beam surrounding the stairs provided on the outside facing part of the building is exposed from the building, and a small strength member is interposed in a part of the steel beam, and vibration energy input to the building is A vibration control structure for a building characterized by converting into plastic energy of a small strength member. The staircase forms a stairway body and landing together, at least one of landing to be opposed relationship across the stairs body, according to claim 1, characterized in that attached to the building skeleton via expansion joints building Vibration suppression structure.

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