JP2000129932A - Earthquake resistant reinforcement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earthquake resistant reinforcement method, allowing the execution while the building is in use, and providing the sure earthquake resistant strength without impairing any appearance or openings of a building. SOLUTION: This earthquake resistant reinforcement method is applicable for an earthquake resistant reinforcement in an existing building. In the method, a steel plate earthquake resistant wall 1 provided with a plurality of slits 12... extending in the vertical direction is directly or indirectly and rigidly joined with upper and lower beams 2a, 2b to form a skeleton of the building, and the upper and lower beams 2a, 2b are connected to each other by the steel plate earthquake resistant wall 1 having slits.

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 retrofitting an existing building.

[0002]

2. Description of the Related Art Conventionally, as an anti-seismic reinforcement method for providing an anti-seismic reinforcement to an existing building, for example, construction of an external brace structure,
Increasing RC shear walls and reinforcing steel columns and carbon fiber winding. As shown in FIG. 7 (FIG. 7 (a) is a front view of a building, and FIG. 7 (b) is a plan view thereof), an external brace structure is provided with an external frame P2 for seismic reinforcement around the building P1, These external frames P2 ... and building P1
And the external frame P
The structure is reinforced by installing braces (or vibration control braces) P3 in 2.

[0003]

However, the above-mentioned conventional seismic retrofitting method has several problems as follows. First, in the construction of an external brace structure, a large construction yard and site are required to install the external frame, and the foundation of the external frame depends on the magnitude of the shearing force that the seismic elements such as braces bear. Is too large. In addition, there is a problem that the view of the building is impaired by the brace structure, and the opening required for the building is closed by the brace. In addition, it is difficult to add RC shear walls and reinforce columns with steel plate and carbon fiber winding while using a building, and special techniques are required for reinforcing columns with carbon fiber winding. There is a problem that quality control is also difficult.

The applicant of the present invention has developed a shear wall which is very useful for enhancing the earthquake resistance of a structure.
5740, JP-A-9-203241, Japanese Patent Application No. 9-1
No. 91,535. This earthquake-resistant wall has a configuration in which a steel plate with slits provided with a plurality of slits extending in the vertical direction is joined to the upper and lower beams that constitute the framework of the building, and the upper and lower beams are connected by the steel plate with slits. ing. According to such an earthquake-resistant wall, the steel plate with the slits bears the shear force of the layer against the shaking of the building along the plate surface of the steel plate with the slits, thereby improving the earthquake resistance of the building. Also, by changing the arrangement and number of the slits of the steel plate shear wall with slits, the rigidity and strength of the shear wall can be adjusted, and the rigidity and strength suitable for the structure of the building can be easily obtained.

The present invention has been made in view of the above situation, and provides a seismic retrofitting method capable of performing construction while using a building without deteriorating the scenery and opening of the building and obtaining a reliable seismic strength. It is intended to be.

[0006]

In order to solve the above-mentioned problems, an invention according to claim 1 is an earthquake-resistant reinforcing method for providing an existing building with an earthquake-resistant reinforcement, wherein upper and lower beams constituting a frame of the building are provided with: A method of directly or indirectly rigidly joining a steel plate with slits provided with a plurality of slits extending in the vertical direction, and connecting the upper and lower beams by the steel plate with slits.

According to the first aspect of the present invention, since the construction is performed only by rigidly connecting the steel plate with slits to the upper and lower beams, the construction is simple, and the construction can be performed while using the building. In addition, steel plate shear walls with slits can be easily adjusted for rigidity and proof strength depending on how slits are provided,
With this adjustment, it is possible to provide seismic reinforcement of rigidity and strength suitable for the installation location. Further, no special technique is required for manufacturing and constructing the slit steel plate earthquake-resistant wall, and a reliable earthquake-resistant strength can be obtained with high reliability. In addition, since the steel plate with slits can be produced at the factory, the quality can be easily controlled.

This seismic retrofitting method is applicable to buildings having a steel structure, a steel reinforced concrete structure, a reinforced concrete structure, a wooden structure, and various composite structures. Also,
The indirect rigid connection is, for example, a connection through a member (joint member such as a cut T-shaped steel, an angle, a gusset plate, or concrete) rigidly joined to a beam.

According to a second aspect of the present invention, there is provided the seismic retrofitting method according to the first aspect, wherein a rigidity value of the slit steel plate shear wall is determined in accordance with the strength of the seismic reinforcement applied to each floor of the building.
Alternatively, at least one of the number of joints of the steel plate with slits is changed.

Generally, when an existing building is subjected to seismic reinforcement, the required strength of the seismic reinforcement differs depending on the floor of the building. Therefore, according to the invention of claim 2, by changing the rigidity value or the number of joints of the steel plate with slits to be installed or the number of joints for each floor of the building, it is possible to realize the seismic reinforcement strength suitable for each floor of the building. . Therefore, it is possible to provide ideal seismic reinforcement for the entire building with the minimum necessary materials and construction, and to keep construction costs low.

Here, the rigidity value of the steel plate with a slit includes, for example, the thickness of the steel plate, the interval between the slits, the length of the slits, the arrangement of the slits, and the steps of forming the slits. Etc.), and can be easily changed and adjusted by changing the width of the steel plate with slits.

According to a third aspect of the present invention, in the aseismic reinforcement method according to the first or second aspect, the steel plate with slits is provided on the building as viewed in a direction perpendicular to a longitudinal direction of the beam and in a horizontal direction. The construction method was to be installed in the area that overlaps the pillars that make up the skeleton.

In general, there is an opening area such as a window or a veranda between the upper beam and the lower beam, and when a steel plate with slits is installed, the opening is closed, which is not convenient. There is no such opening area in the direction perpendicular to the longitudinal direction and in the range that overlaps with the column when viewed in the horizontal direction). Therefore, according to the invention of claim 3, since the steel plate with slits is installed on the side of the column, the seismic reinforcement can be performed without blocking the opening area between the upper beam and the lower beam. . In addition, the steel plate with slits has almost the same rigidity and strength as the building frame regardless of whether it is installed on the side of the pillar or between the pillars. Even if it is installed in a location, reliable seismic reinforcement can be obtained.

According to a fourth aspect of the present invention, in the seismic retrofitting method according to the first or second aspect, when there is an installation-impossible area where the slit steel plate earthquake-resistant wall cannot be installed between the upper and lower beams due to the existing optional material, 1 to be joined to 1 installation area
The slit-type steel plate with slits of the unit was vertically divided into a plurality of pieces, and each of the split steel plate with slits was joined so as to avoid the installation impossible area.

According to the fourth aspect of the present invention, even if there is a non-installable area between the upper and lower beams, the above-mentioned non-installable area is avoided by dividing the steel plate with slits and joining them together. It is possible to install a steel plate shear wall with slits of a predetermined width. In addition, even if the steel plate with slits is installed integrally or divided into multiple parts and joined separately, it is possible to obtain almost the same strength and rigidity as a whole. It is possible to surely obtain the predetermined earthquake-resistant reinforcement while avoiding the non-installable area.

Here, the above-mentioned existing optional items may be various items such as, for example, openings such as windows, pipes and ventilation holes.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. FIG.
1A and 1B show a steel plate shear wall with slits constructed by the seismic retrofitting method according to the embodiment of the present invention, wherein FIG. 1A is a front view thereof, FIG. 1B is a sectional view taken along arrow X1-X1 of FIG. (c) is a sectional view taken along the arrow X2-X2 in (a). According to the seismic retrofitting method of this embodiment, the upper and lower beams 2a and 2b of an existing building are rigidly joined to the slit steel plate shear wall 1 and the upper and lower beams 2a and 2b are connected by the slit steel plate shear wall 1. It is a construction method.

The steel plate with slits 1 has a unit configuration having a constant width and can be produced in a factory. The steel plate with slits 1 is provided with a plurality of slits 12 extending vertically in the steel plates 10a and 10b having a predetermined thickness, and further provided on the side edges of the steel plates 10a and 10b to prevent out-of-plane deformation of the steel plates 10a and 10b. The rigid members 11 are joined together. Bolt holes for bolt connection to the beams 2a, 2b are provided at the upper and lower ends of the steel plates 10a, 10b. Furthermore, in this embodiment, the steel plate with slits 1 is composed of two steel plates 10a and 10b which are divided into two parts vertically (in a direction different from the division described in claim 4). 10b are joined by bolts 17 through a splice plate (attachment plate) 15. According to this configuration, for example, the steel plate with slits 1 can be reduced to half in size during transportation, and the transportation can be facilitated. Also, the splice plate 15
A case where two steel plates 10a and 10b are joined through
In the case where the steel plates are integrally provided without being divided into the two steel plates 10a and 10b, the rigidity and the proof strength of the slit steel plate earthquake-resistant wall are substantially the same. Note that the steel plate with a slit used for the seismic retrofitting method of the present invention is not a steel plate with a slit formed by joining the steel plates 10a and 10b divided into upper and lower parts as described above, but one sheet from the beginning. It is good also as a steel plate earthquake-resistant wall with a slit formed by the steel plate of this.

The steel plate with slits 1 has a steel plate 10
a, 10b, the length of the slits 12, the distance between the slits 12 in the horizontal direction, the number of formed slits 12, and the distance between the upper slit 12 and the lower slit 12 are changed. Thereby, the rigidity value and the proof stress value can be adjusted. The details of these adjustments are disclosed in JP-A-9-203241.
The stiffeners 11 are for improving the maximum strength of the steel plate with slits 1 and for obtaining a stable restoring force. For details of the configuration and operation, refer to Japanese Patent Application No. 9-191535. Is disclosed.

FIG. 2 is a longitudinal sectional view showing one example of a connection structure of the slit steel plate earthquake-resistant wall 1, and FIGS. 2A to 2C show first to third examples. In this embodiment, a case will be described in which the steel plate with slits 1 is constructed in a building having a reinforced concrete structure. As shown in FIG. 2A, a first example of a connection structure of the steel plate with slits 1 is as follows.
A post-cast concrete 20 is cast on the side of the beam 2, and the upper end of the slit steel plate shear wall 1 is joined to the post-cast concrete 20 via a mold steel (for example, a cut T-beam or angle) 34. The lower end of the steel plate with slits 1 is provided with a slab 5 and a post-cast concrete 2 through a mold steel (for example, a cut T-shaped steel or an angle) 31.
0. The base portions are joined to the post-cast concrete 20 (or the slab 5 and the post-cast concrete 20) by anchor bolts 33, 33, 36, and 36, and the plate portions are connected to the high-strength bolts 32, 3.
5 is joined to the slit steel plate shear wall 1. According to such a joint, the steel plate with slits 1 having slits is firmly and rigidly joined to the beam 2 via the shape steels 31 and 34, the post-cast concrete 20 and the anchor bolts 33, 33, 36 and 36, and a large shear force. Can be fully tolerated.

In the second example of the connection structure, as shown in FIG. 2 (b), first, a post-cast concrete 21 is cast on the upper side of the beam 2, and the lower end of the slit steel plate shear wall 1 is anchored. Post-cast concrete 2 via bolts 39
1, the upper end of the steel plate with slits 1 is joined to the beam 2 via anchor bolts 41, 41. In order to prevent the steel plate with slits 1 from abutting on the column 3, a filler plate (scissors) 3 is used.
Offsets are provided via 8, 40. According to such joining, the steel plate with slits 1 with slits is firmly and rigidly joined to the beam 2 via the post-cast concrete 21 and the anchor bolts 39, 39, 40, 40. Can withstand.

In the third example of the connection structure, as shown in FIG. 2 (c), the upper and lower ends of the steel plate with slits 1 are joined to the slab 5 near the beam 2 via the shape steels 43 and 47. is there. The shape steels 43 and 47 have their base portions bolted 45 and 47
The plate is joined to the slab 5 by 45, and the plate portion is joined to the steel plate shear wall 1 with slits by high-strength bolts 44 and 48. According to such joining, the steel plate earthquake-resistant wall 1 with a slit is rigidly joined to the beam 2 via the shape steels 43 and 47, the bolts 45 and 45, the high-strength bolts 44 and 48, and the slab 5. The strength of this rigid joint depends on the joint strength between the beam 2 and the slab 5, and cannot withstand a relatively large shear force. However, since the construction is easy, it is effective in a place where only a small shear force is applied. It is.

FIGS. 3A and 3B show locations where the steel plate with slits 1 is installed. FIG. 3A is a floor plan of the eleventh floor of a building 80 to be subjected to seismic reinforcement, and FIG. It is. FIG. 4 is an enlarged view showing one section of the building 80. In these figures, 80 is a building, 81 is a passage, 83 is a veranda, 84 is an elevator passage, 85 is each dwelling unit, 8.
Numeral 6 denotes an entrance, 3 ... columns, and C denotes a location where the slit steel plate shear wall 1 is installed. In FIG. 3, reference numerals of the dwelling unit 85, the entrance 86, and the pillar 3 are not all attached to avoid complication. As shown in FIG. 4, the steel plate with slits 1 is installed on the side of the columns 3 (in a direction orthogonal to the longitudinal direction of the beam 2 and in a range overlapping with the columns 3 when viewed in the horizontal direction). The width of the slit steel plate earthquake-resistant wall 1 is slightly shorter than the sleeve walls 3a, 3a across the columns 3, and
Do not narrow the opening on the third side.

As shown in FIG. 3, the installation locations C of the steel plate with slits 1 are not at the side of all the columns 3 but at all.
It is the side of the pillars 3... Suitable for each floor. For example, 11
On the floor (a) of the floor, the installation locations C are four places because the strength of the seismic reinforcement required is relatively small, and the installation places C on the fifth floor (b) because the strength of the seismic reinforcement required is relatively large. ... are 19 places. The rigidity and proof strength of the steel plate with slits 1 differ depending on the floor on which the steel plate 1 with slits is installed, and the stiffness and proof strength suitable for the strength of seismic reinforcement required for each floor are selected.

As described above, according to the seismic retrofitting method of this embodiment, since the steel plate with slits 1 is only rigidly connected to the upper and lower beams 2 (2a, 2b), the construction is simple and the building is simple. The construction can be carried out while using 80.
In addition, the rigidity and strength of the steel plate with slits 1 can be easily adjusted by providing slits 12.
With this adjustment, it is possible to provide seismic reinforcement of rigidity and strength suitable for the installation location. Further, no special technique is required for manufacturing and constructing the steel plate earthquake-resistant wall 1 with slits, and a reliable earthquake-resistant strength can be obtained with high reliability. In addition, since the steel plate with slits 1 is manufactured at the factory, quality control can be easily performed.

When an existing building is subjected to seismic reinforcement,
Although the required strength of the seismic retrofit differs depending on the floor of the building, according to the seismic retrofitting method of this embodiment, the rigidity value and the number of joints of the slit steel plate shear wall 1 to be installed are determined by the building 80.
, The strength of the seismic reinforcement suitable for each floor of the building 80 is realized. Therefore, it is possible to provide ideal seismic reinforcement for the entire building 80 with the minimum necessary materials and construction, and to keep construction costs low.

In general, there is an opening area such as a window or a veranda 83 between the upper beam 2a and the lower beam 2b. However, according to the seismic retrofitting method of this embodiment, the steel plate with slits 1 Since it is installed on the side of the columns 3, the seismic reinforcement can be performed without closing the opening area between the upper beam 2a and the lower beam 2b. Also, the steel plate with slits 1 exerts substantially the same rigidity and strength on the frame of the building 80 regardless of whether the installation location is near the columns 3 or between the columns 3 and 3. Even if it is installed in the vicinity of 3 ..., reliable seismic reinforcement can be obtained.

The present invention is not limited to the seismic retrofitting method according to this embodiment. For example, the seismic retrofitting method of the present invention can be applied not only to a building having a reinforced concrete structure or a steel reinforced concrete structure, but also to a building having a steel structure or a wooden structure. The specific details such as the configuration of the steel plate with slits, the joint structure, and the installation location can be appropriately changed without departing from the gist of the invention.

[Other Embodiments] FIG. 5 shows a construction variation of a steel plate shear wall with a slit.
(A) to (c) show first to third examples thereof. In the figure,
2a and 2b are beams, 3 and 3 are columns, and 1A to 1D are slit steel plate shear walls. Slitted steel plate shear walls are divided vertically and divided into multiple parts, and the same is true whether these divided steel plate sheared walls with slits are individually joined or joined together without being divided. Rigidity and proof stress are obtained. Therefore, as shown in FIG. 5, as shown in FIG. 5C, one unit (predetermined width) of a steel plate shear wall 1 </ b> D having slits is usually installed between the two columns 3 and 3. , As shown in FIGS.
If there is an existing object such as a window, a ventilation hole, a pipe hole, or the like between the pillars 3 and 3 and there is a non-installable area 90 or 91 where the steel plate with slits 1D cannot be installed, the steel plate with slits is vertically extended. The steel plate with slits 1A, 1B, 1C divided into a plurality and divided into a plurality of pieces are joined to the beams 2a, 2b avoiding the non-installable areas 90, 91. According to this construction method, seismic reinforcement with a predetermined strength and rigidity can be performed while avoiding the non-installable areas 90 and 91 between the upper and lower beams 2a and 2b. In addition, it is good to divide | segment the steel plate with a slit at a factory normally, and to provide a stiffener at the side edge part of the steel plate with a slit after the division.

[Other Embodiments] FIGS. 6A to 6C show a variation of a connection structure when a steel plate with slits is installed in a steel frame building. FIGS. This is a third example. As shown in the figure, the steel plate with slits 1 can be installed in a steel frame building. For example, as shown in FIG. 3A, the connection structure is provided with a high strength through a splice plate 132 to gusset plates 130, 131 provided on H-shaped steels 120, 120 constituting the beams of the building. The steel plate with slits 1 with slits is joined by bolts 133. Further, for example, as shown in FIG. 2B, the steel beams 135 and 135 are joined to the H-shaped steel 120 constituting the beam by bolts 137 and 137, and the steel plate sheared wall 1 with slits is attached to the steel beams 135 and 135. Joined by bolts 136. For example, as shown in FIG. 3C, the steel plate shear wall 1 with slits is directly joined to the channel steel 121 constituting the beam of the building by bolts 139.

The connection structure when the steel plate with slits is installed in a steel-framed building is not limited to the above-described specific example, and can be changed as appropriate without departing from the gist of the invention. Needless to say.

[0032]

According to the first aspect of the present invention, the construction of the seismic reinforcement is easy and the construction can be carried out while using the building. Further, the rigidity and strength of the steel plate shear wall with slits can be easily adjusted, and by this adjustment, seismic reinforcement with strength and rigidity suitable for the installation location is possible. In addition, no special technology is required for the manufacture and construction of the steel plate with slits, and a reliable earthquake resistance can be obtained with high reliability, and quality control can be easily performed.

According to the second aspect of the present invention, ideal seismic reinforcement can be applied to the entire building with the minimum necessary materials and construction. Therefore, the construction cost can be kept low. According to the third aspect of the present invention, by installing the steel plate with slits on the side of the column, it is possible to perform seismic reinforcement without impairing the opening area between the upper beam and the lower beam.

According to the fourth aspect of the present invention, by dividing and joining the steel plate with slits, the seismic reinforcement with a predetermined strength and rigidity is performed while avoiding the area where the upper and lower beams cannot be installed. I can do it.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a steel plate shear wall with slits constructed by a seismic retrofitting method according to an embodiment of the present invention, wherein FIG. ,
(C) is an arrow X2-X2 sectional view of (a).

FIG. 2 is a vertical cross-sectional view showing an example of a connection structure of a steel plate with slits provided with slits, and (a) to (c) are first to third examples thereof.

FIG. 3 shows a place where a steel plate shear wall with a slit is installed, (a) is a floor plan of an eleventh floor of a building to be subjected to seismic reinforcement,
(B) is a floor plan of the fifth floor of the same building.

FIG. 4 is an enlarged view showing one section of the building.

FIG. 5 shows construction variations of a steel plate shear wall with a slit, and (a) to (c) are first to third examples thereof.

FIG. 6 shows a variation of the connection structure of the steel plate with slits provided with slits, wherein FIGS.
This is an example.

7A and 7B show an external brace structure as an example of a conventional seismic retrofitting method. FIG. 7A is a front view of a building provided with the external brace structure, and FIG. 7B is a plan view of the building. is there.

[Explanation of symbols]

1, 1D Slitted steel plate wall 1A-1C Slitted steel plate wall (one unit is divided into a plurality) 2a, 2b Beam 3 Column 11 Stiffener 12 Slit 80 Building 81 Passage 83 Veranda 90 , 91 Non-installable area 120, 121 Beam (H-shaped steel, grooved steel) C ... Installation location of steel plate with slits

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Terutake Imamura 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. (72) Inventor Shigeru Yoshino 2- 10-26 Fujimi 2-chome, Chiyoda-ku, Tokyo Maeda Construction Industries Co., Ltd. (72) Naohiro Yoshida, Inventor 2--10-2, Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industries Co., Ltd., (72) Keizo Higashima, 2--10-2, Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. F-term (reference) 2E176 AA02 AA04 AA07 AA09 BB21 BB28

Claims (4)

[Claims] 1. A seismic retrofitting method for providing seismic retrofit to an existing building, wherein upper and lower beams constituting a frame of the building are directly or indirectly connected with a slit steel plate shear wall having a plurality of slits extending vertically. Characterized in that the upper and lower beams are connected to each other by the slit-shaped steel plate shear wall. 2. The rigidity value of the steel plate with slits according to the strength required for seismic reinforcement applied to each floor of the building,
The seismic retrofitting method according to claim 1, wherein at least one of the number of joints of the steel plate with slits is changed. 3. The steel plate shear wall with slits is installed in a range overlapping with a pillar constituting a framework of the building when viewed in a direction perpendicular to a longitudinal direction of the beam and in a horizontal direction. Item 3. The seismic retrofitting method according to item 1 or 2. 4. When there is a non-installable area where the slit steel plate is not installed between the upper and lower beams due to an existing article, one unit of the slit steel plate shear wall to be joined to one installation area is vertically divided. The seismic retrofitting method according to claim 1 or 2, wherein each of the plurality of slit steel plates with slits is joined while avoiding the installation impossible area.