JP4247496B2 - Seismic reinforcement structure - Google Patents

Description

  The present invention relates to a seismic reinforcement structure for an existing building, and more particularly, to a seismic reinforcement structure in which a seismic reinforcement structure is newly installed on a wife side to perform seismic reinforcement in the direction of the beam.

  As is well known, a so-called plate-like shape that is long in one direction (long side direction = digit direction) is generally used as a form of a mid-to-high-rise apartment building. As a general rule, the long side direction is a pure ramen structure with a ramen frame, and the other direction (short side direction = span direction) is a structure in which a ramen frame is combined with a seismic wall.

  By the way, in the building having the above structure in the form as described above, the seismic performance in the direction of girder, which is a pure ramen structure, is often insufficient compared to the span direction in which many seismic walls are provided. Some existing buildings may not be able to meet the current seismic standards, so such existing buildings will require seismic reinforcement in the direction of the beam.

  In general, it is not practical to apply seismic reinforcement to an existing building as described above, especially in the case of apartment buildings, because it is impossible to renovate while living. For example, a method of constructing a strong reinforcement frame on the outer wall in the longitudinal direction (in many cases, the south side where balconies are provided or the north side where shared corridors are provided) is integrated into existing buildings. ing. However, it is not preferable to install a new outer peripheral frame on the balcony surface of the apartment building because lighting to each dwelling unit is greatly hindered, and construction noise and vibration for each dwelling unit cannot be ignored. However, the renovation work is still difficult.

Therefore, for example, as shown in Patent Document 1, it has also been proposed to reinforce in the direction of the beam by providing a reinforcement frame on the wife side of an existing building. This is because the reinforcement frame consisting of the new pillar, the new beam, and the damping damper is installed on both ends of the existing building, so that these reinforcement frames function as buttresses and the deformation of the existing building is suppressed, and the damping damper This reduces the vibration during the earthquake and suppresses it, resulting in an excellent seismic control effect. According to this, it is possible to renovate while living because only the reinforcement frame is provided on both wives side, and it does not require a proper installation space, and the residential property will not be impaired after the renovation, so it is especially a collective housing It is considered effective as an application to buildings.
JP 2004-176460 A

  However, the seismic reinforcement structure shown in Patent Document 1 is based on the premise that reinforcement frames are provided on both ends of the existing building. Therefore, the reinforcement frame is installed on one side due to the restriction that sufficient installation space cannot be secured on both ends. If it can only be installed on the wife side, sufficient reinforcement and seismic control effects cannot be obtained for the entire existing building, leaving room for improvement.

  In view of the above circumstances, an object of the present invention is to provide a more effective seismic reinforcement structure capable of obtaining a sufficient seismic reinforcement effect.

  The present invention provides a seismic retrofit structure in which a seismic retrofit structure is newly installed on the side of the wife in order to perform seismic retrofit of the existing building. A main frame composed of a ramen frame extending in the beam direction, a sub-frame that stiffens the main frame from the span direction, and a vibration control damper incorporated in the main frame, wherein the main frame is at least a pair of two. The new pillar of the book and the new beam erected in each layer between the new pillars are mainly connected to the existing pillar on the wife's face of the existing building. The sub frame includes a new beam in the span direction of each layer, one end of which is joined to one new column in the main frame, and a horizontal brace installed between the new beam and the main frame. , The new beam to each of the wife face of the existing building The seismic damper is connected to the side of the existing beam provided on the entire length, and the seismic damper is connected to the new column in the main frame and the new beam in the column direction installed in each layer between them. It is characterized by being constructed in the form of braces on each layer in between.

  In the present invention, it is preferable to install two dampers on each layer side by side in a row direction so as to form a C shape or an inverted C shape. In that case, the direction of the dampers in each layer is set for each layer. It is preferable that four seismic dampers are installed in an X shape for every two layers by making the directions reverse to each other.

  In the present invention, when there is a projecting part such as an existing staircase on the wife side of an existing building, or when a new projecting part such as a staircase is newly installed, the substructure is between the frame of the projecting part and the main structure. It is conceivable to install a horizontal brace as part of the frame.

  As the damping damper in the present invention, a damper main body made of a strip-shaped steel plate that functions as a brace and yields in the axial direction and also functions as a steel damper, and is attached to the outside of the damper main body and buckled. A brace damper including a restraining member for restraining can be suitably used.

  According to the present invention, the seismic reinforcement frame is composed of the main frame and the sub frame, and the new column and the new beam in the main frame are integrally bonded to the existing column and the existing beam in the existing building, respectively. Therefore, the seismic reinforcement frame functions in the same way as a buttress, and the deformation of the existing building in the direction of the beam is effectively suppressed, and the vibration during the earthquake is effectively suppressed and attenuated by the seismic damper incorporated in the earthquake resistance frame. As a result, excellent seismic reinforcement and seismic control effects can be obtained.

  In particular, by installing two seismic dampers in each layer in a C-shape or reverse C-shape, a large number of seismic dampers can be installed without hindrance, and the seismic reinforcement frame can be installed on one wife side. Even if it is installed only in the building, it is possible to obtain an excellent seismic control effect for the entire existing building. In that case, by installing the damping damper as a whole in an X shape for every two layers, it is possible to omit the intermediate pillars that are usually provided at the intersections, and it is also bold in design. A preferable appearance can be obtained.

  In addition, by using the frame of the projecting portion such as an existing or new staircase as a part of the sub frame, the rigidity in the span direction of the main frame can be reasonably ensured.

  Furthermore, by adopting the brace damper as the seismic damper, it can be easily installed in the form of braces with respect to the main frame, and an excellent reinforcing effect and a seismic effect can be obtained.

  An embodiment of the present invention will be described with reference to FIGS. The existing building to be reinforced in this embodiment is a 10-story apartment building with a balcony on the south side and a shared corridor on the north side, and has a plate shape as a whole, although it is coasting in the middle. The structure is based on a reinforced concrete ramen structure and the girder direction is a pure ramen structure, and the span direction is a seismic wall structure, and the seismic performance in the girder direction is not sufficient compared to the span direction. The seismic reinforcement structure of the present invention is applied in order to improve the seismic performance in the beam direction.

  In addition, in a building having such a lame portion, both sides of the lame portion behave substantially as independent buildings structurally. The reinforcing frame 1 (1A, 1B) is provided. The seismic reinforcement frames 1A and 1B basically have the same structure, but the seismic reinforcement frame 1B provided on the east side (right side in the figure) is the seismic reinforcement frame provided on the west side (left side in the figure) as described later. Since it is somewhat simplified as compared with 1A, the following will describe the seismic reinforcing frame 1A in detail, and for the seismic reinforcing frame 1B, the same components will be assigned the same reference numerals to simplify the description. .

  The seismic strengthening frame 1A consists of a main frame 2 in the form in which the existing frame in the beam direction on the south side (balcony side) of the existing building is extended to the wife side, a sub frame 3 provided behind the main frame 2, and a main frame 1 It consists of a built-in seismic damper 4.

  As shown in detail in FIGS. 3 to 4, the main frame 2 is composed of a pair of two new columns 5 (5 a, 5 b) made of steel reinforced concrete, and in the direction of the columns installed between the new columns 5 a, 5 b. The main structure is a one-way rigid frame with a steel-framed new beam 6, and of these two new columns 5a and 5b, the new column 5a on the existing building side is reinforced concrete provided on the end face of the existing building. The existing pillar 7 is integrally fastened with a number of post-installed anchors 8 over the entire length, and the other new pillar 5b is installed as an independent pillar independent from the new foundation 9 (see FIG. 1). It should be noted that the post-installed anchor 8 does not generate a large noise or vibration at the time of construction, and the new pillar 5a and the existing pillar 7 can be reliably integrated by a simple method, but when the new pillar 5a is constructed, By performing roughening on the surface layer portion of the existing pillar 7, their integrated strength can be further increased.

  The main frame 2 described above is a rigid frame frame and can sufficiently secure horizontal rigidity in the direction of the beam. However, it is difficult to secure the rigidity in the span direction by itself. A sub-frame 3 is attached. As shown in FIGS. 4 to 5, the sub-frame 3 in the present embodiment includes a steel-framed reinforced concrete span-direction new beam 11 having one end joined to the new column 5 a, and an intermediate portion of the new beam 11. The main frame 2 is mainly composed of a horizontal brace 12 made of steel frame that is obliquely installed between the main beam 2 and an intermediate portion of the new beam 6 in the direction of the beam. Similar to the above-described new pillars 5a, the new beams 11 are integrally joined to the side portions of the existing beams 13 in the span direction provided in each layer of the end face of the existing building by a large number of post-installed anchors 14 over the entire length. When the new beam 11 is constructed, it is preferable that the surface layer portion of the existing beam 13 is roughed so as to be surely integrated.

  In addition, in the present embodiment, as shown in FIG. 2, the existing staircase 15 is provided so as to protrude from the wife surface, so that the space between the frame of the staircase 15 and the main frame 2 and the subframe 3 is not provided. In addition, by installing the horizontal braces 16, the horizontal braces 16 and the frame of the staircase 15 are used as a part of the sub-frame 3. In that case, a stiffening effect on the main frame 2 can be effectively obtained by installing the horizontal brace 16 so as to be as orthogonal as possible to the main frame 2.

  As shown in FIGS. 1 and 3, a large number of damping dampers 4 are incorporated in the main frame 2 so as to form an X shape as a whole. That is, as shown in FIG. 3, two seismic dampers 4 on each layer are in the shape of a cage or reverse on the inner side of the frame surrounded by both the new pillars 5 a and 5 b and the new beam 6 in each layer in the main frame 2. They are arranged so as to form a C-shape, one end of which is joined to the joint between the new pillars 5a, 5b and the new beam 6 via the gusset plate 20, and the other end is the new beam 6 on the upper floor or the lower floor. It is joined to the central part of the through a gusset plate 21. Then, the direction of the damping dampers 4 of each layer is alternately reversed in every layer, so that the four damping dampers 4 form an X shape around the gusset plate 21 around every two layers. It has been built in. In this embodiment, as shown in FIG. 1, two damping dampers 4 for each layer are installed in an inverted C shape on the odd floors and in a C shape on the even floors, so that four pieces for two layers are provided. Each damping damper 4 is constructed so as to form a 5-stage X-shape as a whole.

  In the present embodiment, a so-called brace damper having a structure shown in FIG. The damping damper 4 includes a damper main body 30 made of a strip-like flat steel plate, and a restraining member 31 that is attached to the outside and restrains buckling. The damper body 30 functions as a brace by being bolted to the main frame 2 via the gusset plates 20 and 21 as described above. Yield portion 30a with a reduced size is formed, and when it receives a predetermined axial force, yield portion 30a yields and plastically deforms to function as a steel damper, thereby absorbing vibration energy and being excellent The seismic control effect is obtained. In addition, as a material of the damper main body 30, low-yield point steel can be suitably used in addition to ordinary steel, and in any case, the material, thickness, length, shape of the yielding part, etc. of the damper main body 30 are set. By doing so, a desired vibration control effect can be obtained.

  As shown in FIG. 6B, the restraining member 31 is attached to a pair of channel steel members 32 that sandwich the damper main body 30 from both sides, and is fastened to the flanges of the channel steel members 32, so that both channel steel members 32 are fastened. It consists of a pair of cover plates 33 connected in an H-shape as a whole, and this restraining member 31 restrains in-plane deformation and out-of-plane deformation while allowing axial deformation of the damper main body 30 and reliably prevents buckling. It has become a thing.

  According to the earthquake-proof reinforcement structure of the present embodiment described above, the earthquake-proof reinforcement frame 1A can be made into a buttress only by providing the earthquake-proof reinforcement frame 1A as described above on the wife side of an existing building that does not have sufficient earthquake resistance in the direction of the beam. It functions in the same way as above and effectively suppresses the deformation of the existing building in the direction of the beam, resulting in excellent seismic reinforcement.

  In particular, the new column 5a of the main frame 2 is not only tightly coupled to the existing column 7 over the entire height, but also a sub frame 3 for stiffening the main frame 2 is provided, and the new beam 11 of the sub frame 3 is also an existing beam. Since the entire seismic strengthening frame 1A is structurally and firmly integrated with the existing building, the seismic force of the existing building is reliably transmitted to the seismic strengthening frame 1A. The seismic damper 4 incorporated in the main frame 2 can be effectively operated to ensure an excellent seismic control effect.

  In addition, by installing two brace dampers as seismic dampers 4 in each layer in a C-shape or reverse C-shape, a large number of seismic dampers 4 can be installed without any trouble, By installing the damping damper 4 as a whole in an X shape every two layers, an intermediate pillar is not required, and a bold and preferable appearance can be obtained in terms of design.

  Of course, the seismic reinforcement structure of the present embodiment is merely provided with the seismic reinforcement frame 1A as described above on the wife side of the existing building. Since it requires no space and can be renovated in a short period of time while living, it is particularly suitable for use in apartment buildings.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and of course, as long as the seismic reinforcement frame 1 is newly provided on the wife side, various types as listed below, for example, Variations and applications are possible.

  In the above embodiment, since the existing building to be reinforced is coasting, the above-mentioned seismic reinforcement frame 1A is provided on one wife side, and the slightly simplified earthquake-proof reinforcement frame 1B is provided on the other side. However, for example, for a simple plate-like existing building as shown in FIGS. 7 to 8, it is sufficient to provide the seismic reinforcement frame 1 </ b> C only on one wife side. In any case, the seismic reinforcement frame 1 may be designed according to the form and scale of the existing building to be reinforced and the required seismic reinforcement performance.

  For example, the seismic strengthening frame 1B described above is a structure in which the distance between the new columns 5a and 5b is made smaller than that of the seismic strengthening frame 1A, and one seismic damper 4 is installed as a brace for each layer. Further, the seismic reinforcing frame 1C shown in FIGS. 7 to 8 is the same as the seismic reinforcing frame 1A with respect to the main frame 2 and the vibration control damper 4, but the sub frame 3 is further strengthened. As shown in FIG. 10, by installing a new column 40, a new beam 41, and a horizontal brace 42 as the sub-frame 3, the entire seismic reinforcement frame 1C itself is configured as a bi-directional frame. In addition, in this earthquake-proof reinforcement frame 1C, the frame of the staircase 15 is not particularly used.

  Further, in the case where two damping dampers 4 are provided in each layer in the shape of C or reverse like the seismic reinforcement frames 1A and 1C in the above embodiment, it is conceivable to provide an intermediate column at the intersection of these. That is, an intermediate column, which is another newly installed column, is provided between the two newly installed columns 5a and 5b in the seismic reinforcing frames 1A and 1C of the above embodiment, and one unit is controlled between these three newly installed columns. Although it is conceivable to provide a damper 4 and the present invention does not prevent such a configuration, the design is such that the stresses of two damping dampers arranged in parallel in each layer are balanced with each other, or every two layers. If the four seismic dampers having the X shape are balanced with each other, the intermediate column is not provided intentionally, and it is more rational to omit the intermediate column as in the above embodiment.

  In the above embodiment, each new column 5 in the main frame 2 is made of steel reinforced concrete, the new beam 6 is made of steel, the new beam 11 in the sub frame 3 is made of steel reinforced concrete, and the horizontal brace 12 is made of steel. The structure of the reinforced frame 1 is arbitrary, and a reinforced concrete structure, a concrete-filled steel pipe structure, a precast concrete structure, and other structures may be employed alone or in any combination as long as desired rigidity and proof stress can be obtained. Is possible.

  In the above embodiment, the new column 5a of the main frame 2 and the new beam 11 of the sub frame are fastened to the existing column 7 and the existing beam 13 by the post-installed anchors 8 and 14, respectively. It is effective because it can be reliably integrated and does not generate large noise or vibration during construction, but it is not limited to this, depending on the structure of the new pillar 5a and the new beam 11 and the structure of the existing building. In order to reliably and firmly integrate them structurally, an optimal method may be adopted as appropriate.

  In the above embodiment, the existing frame of the staircase 15 is used as a part of the sub-frame 3. However, if there is no staircase, it may be newly installed. It is also possible to construct a new structure with a built-in staircase, or to use a frame that combines both frames. Of course, not only the staircase but also the equipment machine room, the equipment shaft, the elevator room, or the core part where these are centrally arranged are provided as protrusions on the wife side, or when the housing is newly installed, It can be used as a part of the frame 3.

  As in the above embodiment, it is preferable to arrange the damping damper 4 in each layer in a C shape or an inverted C shape, and as a whole, it is preferably arranged in an X shape. However, the present invention is not limited to this, and a desired damping effect can be obtained. Thus, it is only necessary to arrange the appropriate number of damping dampers 4 at the appropriate positions. If necessary, the damping dampers 4 may be incorporated not only in the main frame 2 but also in the secondary frame 3. In addition, the brace damper as employed in the above embodiment is suitable as the damping damper, but is not limited thereto, and other types of dampers can be adopted as long as a desired damping effect can be obtained. is there.

  The existing building to be reinforced in the above embodiment is a reinforced concrete 10-story apartment house, but it goes without saying that the present invention can be widely applied to buildings of various structures, scales, and uses.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the seismic reinforcement structure of the present invention, and is an overall elevation view showing an existing building in which a seismic reinforcement frame is installed at a wife part. FIG. FIG. 3 is a partial elevation view showing details of the seismic reinforcement frame. FIG. FIG. 5 is a cross-sectional view of the relevant part (enlarged view taken along line VV in FIG. 4). It is a figure which shows an example of a damping damper same as the above. The other embodiment of the earthquake-proof reinforcement structure of this invention is shown, Comprising: It is the whole elevation view which shows the existing building which installed the earthquake-proof reinforcement frame in the wife part. FIG. FIG. 3 is a partial elevation view showing details of the seismic reinforcement frame. FIG.

Explanation of symbols

1 (1A, 1B, 1C) Seismic reinforcement frame 2 Main frame 3 Sub frame 4 Damping damper (brace damper)
5 (5a, 5b) New column 6 New beam 7 Existing column 8 Post-construction anchor 11 New beam 12 Horizontal brace 13 Existing beam 14 Post-construction anchor 15 Staircase (projection)
16 Horizontal brace 20, 21 Gusset plate 30 Damper body 31 Restraint member 32 Channel steel 33 Cover plate 40 New pillar 41 New beam 42 Horizontal brace

Claims (5)

A seismic retrofit structure with a seismic retrofit frame installed on the side of the wife to perform seismic retrofit of existing buildings
The seismic strengthening frame includes a main frame composed of a ramen frame in the direction of the beam extending the existing frame in the direction of the beam of the existing building to the wife side, a sub frame that stiffens the main frame from the span direction, and the main frame. Consisting of seismic dampers incorporated in the
The main frame is mainly composed of at least one pair of two new columns and new beams installed in each layer between the new columns, and one of the new columns is provided with respect to the existing columns provided on the end face of the existing building. Tightly united throughout the height,
The sub-frame has a new beam in the span direction of each layer in which one end is joined to one new column in the main frame, and a horizontal brace installed between the new beam and the main frame, The new beam is integrally bonded over the entire length to the side of the existing beam provided in each layer of the end face of the existing building,
A seismic retrofit structure characterized in that the seismic damper is constructed in the form of braces on each layer between the new pillars in the main frame and the new beams installed in each layer between them. The earthquake-proof reinforcement structure according to claim 1,
A seismic reinforcement structure, wherein two seismic dampers are laid in a row direction so as to form two or two in each layer. The earthquake-proof reinforcement structure according to claim 2,
The seismic resistance is characterized in that four seismic dampers are installed in an X-shape for each two layers by alternating the direction of the seismic dampers installed two on each layer alternately in each layer. Reinforced structure. A seismic reinforcement structure according to claim 1, 2 or 3,
A seismic reinforcement structure characterized by comprising a horizontal brace that is a part of the sub frame between a frame of an existing or new projecting portion located on the wife side of an existing building and the main frame. The seismic reinforcement structure according to claim 1, 2, 3 or 4,
The seismic damper is a damper body made of a strip-shaped steel plate that functions as a brace and yields in the axial direction and also functions as a steel damper, and a restraint that is attached to the outside of the damper body to restrain its buckling. Seismic reinforcement structure characterized by being a brace damper made of members.

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