JPH1037481A - Damping reinforced construction of existing building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide reinforced construction favorable for promoting earthquake resistance of the existing unfair building. SOLUTION: A steel frame body 4 constituted of a pair of right and left vertical frame members 7a and 7b along columns and a pair of up and down horizontal members 8a and 8b along beams 2 is connected and fixed to the inside of a frame 3 formed of the columns 1 and beams 2 of the existing building through fasteners 9. One side is fixed to one horizontal frame member 8b inside the frame body 4, the other side provides a joint member in a state capable of making relative displacement to the other horizontal member 8a, a damper 6 absorbing vibration energy is provided between the joint member and at least one vertical frame member 7b. As the joint member, a precast concrete earthquake resistant wall 5 or a steel brace or a steel bent column is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping reinforcement structure for improving the seismic performance of an existing building.

[0002]

2. Description of the Related Art In recent years, buildings have been required to have a higher level of seismic performance, and newly-built buildings are to be considered more fully with respect to earthquake resistance. That is natural. However, existing buildings that were constructed in the past and are still in use today are considered to have a problem with earthquake resistance at the moment even if they were considered to have sufficient earthquake resistance at the time of construction. There are many existing ineligible buildings, and some reinforcement is required to improve the earthquake resistance in order to continue using such existing ineligible buildings.

[0003]

As a method for improving the seismic performance of an existing building, there is a method of reinforcing the existing building, especially in the case of a large earthquake, by reinforcing columns or adding earthquake-resistant walls or braces at important points. To increase the resistance to horizontal forces at
Conventionally, the method based on the concept of seismic reinforcement was generally used. However, this involves large-scale renovation work on almost the entire existing building, so not only must the renovation cost and construction period burden be large, but also the lower floors usually require a greater capacity increase. Therefore, the use of existing buildings is often greatly impaired, and it cannot be applied to any existing buildings.

[0004] Further, instead of increasing the strength of existing buildings as described above, a damping device such as a vibration damper is provided in the building to absorb seismic energy to reduce vibration and to quickly attenuate. There is also a method of improving seismic resistance based on the concept of a damping structure. The installation location of the damping device is not particularly limited in the case of such a vibration suppression reinforcement, and therefore, it is not necessary to perform the repair work on the lower floor which is difficult to repair on the convenience of use as in the case of the above-described seismic reinforcement. Despite the advantages, the current practice is that no effective method has been established for installing such damping devices on existing buildings.

[0005]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides an effective vibration damping reinforcement structure for improving the seismic resistance of an existing building. On the inside of the frame constituted by, a steel frame composed of a pair of left and right vertical frame members along the pillar and a pair of upper and lower horizontal frame members along the beam, and disposes the frame body with respect to the frame. The connection member is fixedly connected via a fastener, and a connection member is provided inside the frame body in a state where one side is fixed to one of the horizontal frame members and the other side is relatively displaceable with respect to the other horizontal frame member. The upper and lower horizontal frame members operate together with the upper and lower beams between the other side of the connecting member and at least one of the vertical frame members when interlayer displacement occurs to absorb the vibration energy thereof. A damping device is interposed along the other horizontal frame member. Be Te is characterized in. As the above-mentioned connecting member, a precast concrete earthquake-resistant wall, a steel brace, or a steel bent column can be used.

[0006]

Embodiments of the present invention will be described below. FIG. 1 shows a first embodiment, in which reference numeral 1 denotes a column constituting an existing steel-framed building, and 2 denotes a beam. In the first embodiment, in order to improve the seismic performance of the existing building, a steel frame 4 is provided inside the frame 3 formed by the columns 1 and the beams 2 and the frame 4 is provided. 4, a precast concrete shear wall 5 as a connecting member and a damper 6 as a damping device are provided.
The interlayer displacement between the upper and lower beams on this floor during an earthquake is damped by the damper 6.

That is, inside the above-mentioned frame 3,
A rectangular frame-shaped frame 4 is disposed, which is composed of a pair of left and right vertical frame members 7a and 7b along each column 1 and a pair of upper and lower horizontal frame members 8a and 8b along each beam 2. The horizontal frame member 8 is firmly fixed to the frame 3 by being connected to each beam 2 by a fastener 9, and when the frame 3 deforms during an earthquake and causes interlayer displacement, the frame 4 Are also to be deformed similarly.

The above-described earthquake-resistant wall 5 is provided inside the frame body 4 with its lower edge fixed by being bolted to the lower horizontal frame member 8b. A slight clearance 10 is secured between the upper edge of the upper frame member 8a and the upper horizontal frame member 8a. It is assumed that relative displacement occurs with the member 8a. In addition, between the upper edge part of the earthquake-resistant wall 5 and the upper horizontal frame member 8a, the earthquake-resistant wall 5 is provided.
There is provided a steadying member 11 that restrains the overturn of the outside in the out-of-plane direction and allows the relative displacement described above.

The upper edge of the earthquake-resistant wall 5 is partially cut out to form a notch 12, in which the damper 6 is disposed, and both ends of the damper 6 are connected to the earthquake-resistant wall 5 and one of the vertical portions. Each is connected and fixed to the frame member 7b. This damper 6 operates when the frame 3 and the frame body 4 are deformed during the earthquake and the interlayer displacement occurs, and the interlayer displacement is transmitted through the earthquake-resistant wall 5 to absorb the vibration energy and quickly attenuate. It is to make it. The type of the damper 6 is not particularly limited. For example, a well-known vibration damper such as an oil damper, a friction damper, and a viscoelastic damper can be used. If a viscous damper is employed, vibrations caused by wind can be effectively attenuated, thereby improving comfort.

In order to apply the above structure to an existing building, the vertical frame member 7 corresponding to the dimensions of each part of the installation target location is required.
a, 7b, horizontal frame members 8a, 8b, earthquake-resistant wall 5, damper 6
Are prepared in advance, and they are carried into the installation target position. First, the horizontal frame members 8a and 8b are fixed to the beam 2 by welding via a fastener 9. Next, the vertical frame members 7a, 7b are welded to the ends of the horizontal frame members 8a, 8b to form the frame 4, and the lower part of the earthquake-resistant wall 5 is bolted to the lower horizontal frame member 8b. And secure the upper part with a steady rest 1
1, the both ends of the damper 6 may be appropriately connected to the earthquake-resistant wall 5 and the vertical frame member 7b.

According to the above structure, when the frame 3 of the existing building is deformed during an earthquake and interlayer displacement occurs, the frame 4
Is similarly deformed, and the deformation causes the damper 6 to operate, thereby absorbing vibration energy and rapidly attenuating the vibration. That is, a vibration damping reinforcement structure is realized. According to the present embodiment, the renovation work for strengthening the entire existing building, particularly the renovation work for the lower floors, is not required as in the case of conventional conventional seismic reinforcement by strengthening the strength, and therefore the construction cost and It is advantageous in terms of the construction period and can avoid a great loss of usability, and therefore is suitable for application to existing ineligible buildings.

Particularly, in the present embodiment, the damper 6 is not directly attached to the frame 3 but is attached via the frame 4 and the earthquake-resistant wall 5. Since the frame 4 is fixed to the beam 2 through the joint, the work of joining the frame 4 to the beam 2 can be easily performed, and the repair work required for the joining can be minimized. That is, the beam 2 and the frame 4
By limiting the arrangement to only the position of the fastener 9, it is possible to reduce the places requiring complicated arrangements,
As a result, not only can the removal and restoration work of the finishing material be minimized, but also the construction period can be shortened and the quality of the joint can be ensured. Note that the position of the fastener 9 may be set to a position that does not interfere with them according to the joint position of the beam 2 or the position of a through hole provided in the beam 2.

Further, in the present embodiment, the horizontal frame members 8a,
8b is fixed to the beam 2 along with the fastener 9 so that when the reaction force from the damper 6 is received, the horizontal frame member 8
a, 8b and the beam 2 function integrally as a beam,
Therefore, there is an advantage that the stress of the beam 2 is reduced, and it is also possible to control the stress generated in the beam 2 by adjusting the position of the fastener 9.

FIG. 2 shows a second embodiment of the present invention. This uses a steel brace 20 as a connecting member instead of the earthquake-resistant wall 5 in the first embodiment. That is, in the second embodiment, two steel materials 21,
Brace 20 by combining 21 in the shape of a mountain
The lower end is fixed to both ends of the lower horizontal frame member 8b, and the upper end is
1 only restricts the fall in the out-of-plane direction, and does not restrict the relative displacement with respect to the upper horizontal frame member 8a.
The damper 6 is interposed between the upper end of the brace 20 and the upper end of the vertical frame member 7b.

FIG. 3 shows a third embodiment, in which a steel bending column 30 is employed as a connecting member. That is, in the third embodiment, the upper end of the bending column 30 is welded and fixed to the center of the upper horizontal frame member 8a, and a slight gap is formed between the lower end of the bending column 30 and the lower horizontal frame member 8b. The clearance 31 is secured to allow relative displacement there, and the damper 6 is interposed between the lower end of the bent column 30 and the lower end of the vertical frame member 7b.

The second and third embodiments are the same as the first embodiment except that the form of the connecting member is different, and both can provide the same effects as those of the first embodiment. It is.

Although the embodiment of the present invention has been described above, the present invention can further arbitrarily make various design changes. For example, even if the top and bottom and left and right of each of the above embodiments are reversed, exactly the same operation and effect can be obtained, and if necessary, in addition to joining the horizontal frame members 8a and 8b to the beam 2 with the fastener 9, or Instead, the vertical frame members 7a, 7b
May be joined to the column 1 by a similar fastener.

Although the frame 4 in each of the above embodiments has a rectangular frame shape, the form of the frame 4 is not limited to the above. For example, as shown in FIG. , 7b are joined slightly inward from both ends of the horizontal frame members 8a, 8b, or the vertical frame members 7a, 7b are vertically divided into two at the intermediate position as shown in FIG. Each of the vertical frame members 7a and 7b is attached to the column 1 with a fastener 9 using a set of three-sided frame bodies 41 having the above-described configuration.
It is also possible to join them. In FIGS. 4 and 5, the same earthquake-resistant wall 5 as in the first embodiment is provided in the frame bodies 40 and 41, but instead of the earthquake-resistant wall 5, the brace 20 and the third embodiment in the second embodiment are used. It goes without saying that a bent column 30 in the form may be provided.

Further, in each of the above embodiments, the earthquake-resistant wall 5, the brace 20, and the bending column 30 are adopted as the connecting members. However, other types of connecting members can be used as long as they can transmit the interlayer displacement to the damper 6. It can be adopted, and is not limited to installing one damper 6 on one side of the connecting member as in each of the above embodiments, but installing dampers 6 on both sides of the connecting member, and using two dampers on both sides of the connecting member. May be configured to absorb vibration energy and attenuate vibration.

In the above description, the case where the existing building is made of steel is described as an example. However, the present invention is also applicable to a case where the existing building is made of steel reinforced concrete or reinforced concrete. In such a case, the concrete of the existing frame may be cut off to expose the steel frame or the reinforcing bar, and the frame may be joined thereto via a fastener, and then the concrete may be repaired.

[0021]

As described above, in the vibration damping reinforcement structure of the present invention, the frame composed of the horizontal frame member and the vertical frame member is connected and fixed via the fastener inside the frame of the existing building, A damping device such as a damper is interposed between the connecting member and the vertical frame member by providing a connecting member consisting of an earthquake-resistant wall, braces, or bent columns, etc. Can be easily implemented, and is suitable for application to existing ineligible buildings.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a second embodiment.

FIG. 3 is a schematic configuration diagram showing a third embodiment.

FIG. 4 is a view showing another example of a frame.

FIG. 5 is a view showing still another embodiment of the frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Column 2 Beam 3 Frame 4 Frame 5 Earthquake-resistant wall (connection member) 6 Damper (damping device) 7a, 7b Vertical frame member 8a, 8b Horizontal frame member 9 Fastener 20 Brace (connection member) 30 Bending column 40, 41 Frame body

Claims (4)

[Claims] 1. Inside a frame formed by pillars and beams of an existing building, a steel made of a pair of left and right vertical frame members along the columns and a pair of upper and lower horizontal frame members along the beams. A frame is arranged and the frame is connected and fixed to the frame via a fastener, and inside the frame, one side is fixed to one of the horizontal frame members and the other side is the other horizontal frame. Providing a connecting member in a state capable of relative displacement with respect to the member,
Between the other side of the connecting member and at least one of the vertical frame members, the upper and lower beams and the upper and lower horizontal frame members actuate when interlayer displacement occurs and absorb the vibration energy thereof. A vibration damping reinforcement structure for an existing building, wherein a device is interposed along the other horizontal frame member. 2. The vibration damping reinforcement structure of an existing building according to claim 1, wherein the connecting member is a precast concrete earthquake-resistant wall. 3. The structure according to claim 1, wherein the connecting member is a steel brace. 4. The vibration damping reinforcement structure for an existing building according to claim 1, wherein said connecting member is a steel bending column.