JP3369387B2 - Seismic retrofit of existing buildings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic retrofitting method for an existing building, in which an earthquake resistant frame is added to the existing building to reinforce the existing building.

[0002]

2. Description of the Related Art As a method of retrofitting an existing building against earthquakes, a method of adding a seismic resistant element such as a steel brace or a bearing wall to the existing building, a method of increasing the wall thickness of the bearing wall, A method of increasing the cross-section of columns / beams, or a method of combining these can be considered.

Methods for increasing the cross-sections of columns and beams include a method involving addition of reinforcing bars, a method of winding a steel plate, a method of winding reinforcing fibers, and a method of welding a cover plate in the case of steel frame construction.

According to the above-mentioned reinforcement work, since excessive stress is concentrated on the reinforced portion, the existing pillar / beam frame structure around it cannot withstand the stress concentration. Therefore, the peripheral frame is reinforced. The need arises, resulting in expansion of the reinforced object. For this reason, the reinforcement target covers a wide range on all floors of the existing building and has a great influence on the inside of the existing building.

[0005] In particular, since the opening is closed in the construction work, after the reinforcement, the evacuation route and the evacuation distance in the building are secured, and the use plan is restricted.

Further, since any of the above-mentioned constructions is a reinforcement construction in the building, it is necessary to secure a flow line and a working space for carrying in the construction materials, so that the resident in the building must be relocated. It is almost impossible to carry out the construction with the building in use.

From the above background, the present invention proposes a method of applying seismic reinforcement to an existing building while keeping the building in use.

[0008]

According to the present invention, a plane frame structure which is independent of an existing building in a plane where it does not interfere with the existing building, is parallel to the outer peripheral surface of the existing building, and is located outside the structure of the existing building, Or the seismic frame of the three-dimensional frame without the floor ,
Seismic frame is bypassed, existing building and earthquake frame are horizontal
By constructing to share the power and connecting the seismic frame to the existing building, no reinforcement work is required for the existing building and it is possible to carry out the construction while the building is in use.

When the plane shape of the existing building is closed, the seismic frame is constructed on the outer peripheral part of the existing building, and when it is open or has a hollow part, it is connected to the inner peripheral part of the existing building. It is constructed on either or both of the outer peripheries.

When the existing building has a basement floor, the earthquake-resistant frame is constructed in the ground floor portion and the basement floor portion of the existing building, and is connected to the existing building in each of them.

If the existing building has a basement floor, the seismic frame is as described in claim 3, and the ground floor part of the existing building is
In some cases, the existing building is an earthquake-resistant structure constructed only on the ground floor or an earthquake-resistant structure constructed on the ground floor and basement. Connected with.

The earthquake-resistant frame is connected to each floor of the existing building as described in claim 4 or only in any floor as described in claim 6.

When there is a difference in height between the top of the existing building and the top of the earthquake-resistant frame, as described in claim 5, either one of the tops having a relatively low top and a height equivalent to that height. The other is connected at.

As described in claim 6, the earthquake-resistant frame is connected to the existing building at any position on the plane, on the elevation, and at any height, but the connection position of the earthquake-resistant frame and the existing building is the existing building. In addition, it is determined according to the distribution of rigidity and proof stress on the plane or the elevation of the frame where the earthquake-resistant frame is integrated, and the structural characteristics and vibration characteristics of the frame are determined to be optimal.

Since the newly constructed seismic frame and the existing building are connected, the connecting portion becomes a bypass for flowing the horizontal force acting on the existing building to the seismic frame, and the existing building and the seismic frame share the horizontal force. , It is possible to avoid stress concentration on the frame of the existing building and eliminate the need to reinforce the existing building.

Since the reinforcing work for the existing building is not necessary, there is no restriction on the usage plan in the building even if the seismic frame is constructed. Moreover, since the earthquake-resistant frame is constructed outside the existing building, it is possible to carry out the construction while the building is in use, and it is not necessary to move out the residents in the building.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show a case where a seismic frame 2 is constructed on the outer peripheral portions of four corners of an existing building 1.
Shows the case where the earthquake-resistant frame 2 is constructed along the short side on both sides of the existing building 1 in the long side direction. 5 and 6 show the case where the seismic frame 2 is partially constructed on both sides of the existing building 1 in the short side direction.

The earthquake-resistant frame 2 is parallel to the outer peripheral surface of the existing building 1 as shown in FIGS. 1 and 2, and is a flat frame structure located outside the structure of the existing building, or a floor as shown in FIGS. 3 to 6. It is constructed with a three-dimensional frame that does not accompany it. Although the drawing shows the case where the seismic frame 2 is composed of trusses, it may be a frame with only columns and beams, or a structure in which walls and braces are connected to it, as long as the structure is seismic resistant.

FIGS. 7, 8 and 9 are construction examples when the height of the earthquake-resistant frame 2 is lower than the height of the existing building 1, and correspond to the construction examples of FIGS. 1, 3 and 5, respectively.

FIG. 10 and FIG. 11 are construction examples in the case where the center portion of the existing building 1 on the plane is hollow, and are cases where the seismic frame 2 is constructed in the inner peripheral portion of the existing building 1. Existing building 1 is shown in Figure 1
In the case of the plane shape shown in Fig. 0 and Fig. 11, the seismic frame 2 can be constructed on the outer periphery of the existing building 1.

12 and 13 show the seismic frame 2 shown in FIGS. 10 and 11.
Shows the case of a flat frame.

14 and 15 show a case where the seismic frame 2 is constructed so as to straddle the existing building 1 in the short side direction.

The connecting position of the earthquake-resistant frame 2 and the existing building 1 is determined by the balance of rigidity and proof stress on the plane and the elevation of the new building completed by adding the earthquake-resistant frame 2, and it is not always necessary to connect all floors. .

The left side of the broken line in FIG. 16 is the case where the seismic frame 2 and the existing building 1 are connected on all floors, and the right side is the case where they are connected only on the top floor. This is the case when they are connected only on the floor. Figure 16,
In FIG. 17, circles indicate connected parts.

[0025]

[Effects of the Invention] A plane frame structure which is independent of the existing building and is parallel to the outer peripheral surface of the existing building and located outside the structure of the existing building, or a three-dimensional frame structure without a floor, in a region that does not interfere with the existing building in the plane The seismic frame is used as a bypass.
It is a method of constructing the existing building and the earthquake-resistant frame so that the horizontal force is shared , and connecting the earthquake-resistant frame to the existing building to reinforce the existing building against earthquakes, thus avoiding stress concentration on the frame of the existing building. This eliminates the need for reinforcement of existing buildings.

As a result of eliminating the need for reinforcement work on the existing building, the construction of the earthquake-resistant frame does not impose any restrictions on the usage plan in the building.

Further, since the seismic frame is constructed outside the existing building, it is possible to carry out the construction while the building is in use, and it is not necessary to move out the resident in the building.

In the case of a three-dimensional frame, since the floor area is not increased due to the absence of floors, the building is not expanded in accordance with the Building Standards Law, so there is no increase in the building coverage ratio or floor area ratio, and retrospective of existing buildings can be avoided. There is also an effect.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example in which an earthquake-resistant frame is constructed at four corners of an existing building.

FIG. 2 is a plan view of FIG.

FIG. 3 is a perspective view showing an example in which earthquake-resistant frames are constructed on both sides of an existing building.

FIG. 4 is a plan view of FIG.

FIG. 5 is a perspective view showing an example of constructing a seismic frame on both sides of an existing building.

FIG. 6 is a plan view of FIG.

FIG. 7 is a perspective view showing a construction example when the height of the earthquake-resistant frame shown in FIG. 1 is lower than that of an existing building.

FIG. 8 is a perspective view showing a construction example when the height of the earthquake-resistant frame shown in FIG. 3 is lower than that of an existing building.

9 is a perspective view showing a construction example in which the height of the earthquake-resistant frame shown in FIG. 5 is lower than that of an existing building.

FIG. 10 is a perspective view showing an example in which an earthquake-resistant frame is constructed on an inner peripheral portion of an existing building having a hollow central portion on a plane.

11 is a plan view of FIG.

FIG. 12 is a perspective view showing an example in which an earthquake-resistant frame is constructed on an inner peripheral portion of an existing building having a hollow central portion on a plane.

FIG. 13 is a plan view of FIG.

FIG. 14 is a perspective view showing an example in which a seismic frame is constructed across an existing building.

FIG. 15 is a plan view of FIG.

FIG. 16 is an elevational view showing a case where the existing building and the earthquake-resistant frame are connected on all floors and a case where they are connected only on the top floor.

FIG. 17 is an elevational view showing a case where the existing building and the earthquake-resistant frame are connected only on some floors.

[Explanation of symbols]

1 …… Existing building, 2 …… Seismic frame.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shunichi Yamada               Kashima, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo               Construction Co., Ltd. (72) Inventor Kenji Tomioka               Kashima, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo               Construction Co., Ltd.                (56) References "Nikkei Architecture" (June 1979)               May 11th, p42-48                 Supervised by the Building Guidance Division, Housing Bureau, Ministry of Construction, "Revised               Version of existing reinforced concrete building               Seismic Rehabilitation Design Guide Same Comment, 4th Edition,               Japan Building Disaster Prevention Association, July 1995               15th p24-25 p171-177

Claims (6)

(57) [Claims] 1. A three-dimensional frame structure that is independent of the existing building in a region that does not interfere with the existing building and is parallel to the outer peripheral surface of the existing building and is located outside the structure of the existing building, or a floor structure without a floor. The seismic frame is used as a bypass.
A method of seismic retrofitting an existing building that connects the seismic frame to the existing building by building the existing structure and the seismic frame so that the horizontal force is shared . 2. The method for seismic retrofitting an existing building according to claim 1, wherein the earthquake-resistant frame structure is constructed on a ground floor portion and a basement floor portion of the existing building, and each is connected to the existing building. 3. The earthquake-resistant frame is only on the ground floor of the existing building ,
Or it is built on the ground floor and basement respectively, and the existing building is connected to the seismic frame constructed only on the ground floor , or the earthquake-resistant frame constructed on the ground floor and basement. The method for earthquake-proofing an existing building according to claim 1. 4. The seismic strengthening method for an existing building according to claim 1, wherein the seismic frame is connected to each floor of the existing building. 5. There is a difference in height between the top of the existing building and the top of the earthquake-resistant frame, and one of the tops having a relatively lower top is connected to the other at a height equal to the height. The seismic retrofitting method for an existing building according to any one of claims 1 to 3. 6. The seismic resistance of the existing building according to claim 1, wherein the seismic-resistant frame and the existing building are connected in a plane, at an arbitrary position, on an elevation, and at an arbitrary height. Reinforcement method.