JP4640672B2 - Anti-seismic reinforcement structure for existing buildings - Google Patents

Description

  The present invention relates to a seismic reinforcement structure for an existing building, and more particularly to a seismic control structure for an existing building using an existing wall.

When an existing building is seismically reinforced, a seismic wall is newly installed in a place where there is no hindrance or a seismic control device is added so that the seismic wall will not be sheared and destroyed during a large earthquake. For example, Patent Document 1 discloses a seismic damping reinforcement structure for an existing building in which a reinforcement frame is installed along an opening surrounded by columns and beams, and a damping device is incorporated in the reinforcement frame.
In addition, if there is not enough space to install a seismic wall or a vibration control device, it is possible to prevent shear failure and improve proof stress by increasing the number of existing seismic walls that may cause shear failure. Has been done. For example, in Patent Document 2, a plurality of anchors are driven into pillars and beams around the existing seismic wall, and anchors with a plurality of spacers are driven into the surface of the existing seismic wall, and a welding wire mesh is fixed to the protruding spacer. A method for increasing the thickness of an existing seismic wall by spraying mortar on the surface of a welded wire mesh is disclosed.
JP 11-350777 A JP-A-8-49329

However, in the conventional seismic reinforcement method, in order to ensure the required seismic performance, it may be necessary to install a large number of seismic walls and vibration control devices, which increases the weight of the building and impairs the effective space. There's a problem .
On the other hand, increasing the number of existing seismic walls increases the weight of the building and requires a lot of time-consuming work.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a seismic reinforcement structure for an existing building that does not increase the weight of the building and does not impair the effective space.

  In order to achieve the above object, the present invention provides a boundary between an existing wall in which at least one wall surface is flush with a side surface of an upper floor beam, a column integrated with the existing wall, and an upper floor beam. In addition, a slit is provided in each portion, and an oblique notch portion is provided in an elevational cross-sectional view on the upper edge portion of the one wall surface and the lower edge portion of the side surface of the beam. A seismic retrofit structure for an existing building having a seismic device installed, wherein the seismic control device has substantially the same inclination angle as the inclined surface formed in the notch, and is fixed to the inclined surface, respectively. A pair of flange plates and a panel portion extending between the pair of flange plates.

  The present invention provides a slit at the boundary between the existing wall and the column to improve the tough performance of the column and prevent the column from shear failure, and provide a slit between the existing wall and the upper floor beam. A seismic control device using the shear deformation of the panel (hereinafter also referred to as a panel damper) is installed between the existing wall and the beam on the upper floor, and the relative relationship between the existing wall and the beam on the upper floor is The panel portion is plastically deformed by the displacement, and the energy generated in the building is absorbed by the panel portion.

  In particular, when at least one wall surface and the side of the upper floor beam are flush with each other, the upper edge of the existing wall on the side that is flush with the lower edge of the upper floor beam, In each sectional view (when viewed in the direction in which the beam on the upper floor extends), an oblique cutout is provided, and a panel damper is installed in the cutout, so the slit width between the existing wall and the beam on the upper floor Can be minimized, and the construction becomes easy.

In the present invention, the panel portion may be made of extremely low yield point steel, and a stiffening rib may be disposed between the pair of flange plates.
In the present invention, a panel damper having a large energy absorption performance can be realized by using an extremely low yield point steel having a low yield point and a large elongation performance as compared with ordinary steel for the panel portion. Further, by arranging the stiffening rib between the pair of flange plates, the local buckling of the panel portion can be prevented.

In the seismic reinforcement structure for an existing building according to the present invention, a slit is provided in each boundary portion between the existing wall, the pillar integrated with the existing wall, and the beam on the upper floor, Panel dampers are installed between the two so that the weight of the building does not increase and the effective space is not impaired. In particular, as a target the case where the side surface of the beam of at least one of the wall and the upper floor are flush, the upper edge portion and lower edge portion of the beam of the upper floor of the existing wall of the side that is flush with In addition, each of them is provided with an oblique notch in an elevational cross-sectional view, and a panel damper is installed in the notch, so that the slit width between the existing wall and the beam on the upper floor can be minimized and construction is easy. Become.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, what is described in paragraphs 0016 to 0019 (FIGS. 5 to 7) is a reference example related to the present invention and is not inherently included in the embodiment of the present invention. The second embodiment will be described.
[First embodiment]
FIG. 1 shows an overview of the present embodiment, FIG. 2 shows an enlarged view of a panel damper (seismic control device) portion, and FIG. FIG. 4 is a perspective view of the panel damper.
The target existing wall 12 is formed in a construction surface surrounded by the adjacent columns 14 and 14 and the upper-floor beam 13 installed therebetween, and one wall surface 12b is a side surface of the upper-floor beam 13. It is flush with 13b.

  In the present invention, slits 15 and 15 are provided at the boundary between the existing wall 12 and the columns 14 and 14 on both sides thereof to cut the edges of the existing wall 12 and the columns 14 and 14, and A slit 16 is also provided at the boundary with the beam 13 to cut the edge with the beam 13 on the upper floor, and the existing wall 12 is a wall body independent of the pillar and the beam.

  Further, the upper edge of the existing side wall 12 on the same side and the lower edge of the beam 13 on the upper floor are cut out to provide a cutout 17, and the panel damper 11 is installed in the cutout 17. Yes. Specifically, the upper edge portion of the existing wall 12 and the lower edge portion of the upper floor beam 13 are the same as the length of the panel damper 11 in the sectional view (in the direction in which the upper floor beam 13 extends). (See) A triangular cutout 17 is formed by cutting it at an angle of 45 degrees, and the formed inclined surfaces 12a and 13a are leveled by the mortars 18 and 18, and then the panel damper 11 is installed on the mortars 18 and 18. The anchor bolts 19 are fixed to the inclined surfaces 12a and 13a (see FIG. 3).

The panel damper 11 includes a pair of strip-like flange plates 11b and 11c having substantially the same inclination angle as the inclined surfaces 12a and 13a formed in the notch 17, and a band extending between the pair of flange plates 11b and 11c. It is schematically configured from a plate-like panel portion 11a (see FIG. 4). A plurality of stiffening ribs 11d are arranged between the pair of flange plates 11b and 11c with a predetermined spacing in the longitudinal direction of the panel damper 11 in order to prevent local buckling of the panel portion 11a. Yes.
Extremely low yield point steel is used for the panel part 11a, and large energy can be absorbed when the panel part 11a yields early.
The flange plates 11b and 11c each have a plurality of bolt holes 11e for the anchor bolts 19. The flange plate 11b is formed on the inclined surface 13a, and the flange plate 11c is formed on the inclined surface 12a with the anchor bolt 19 respectively. Fixed.

  Since the pillar 14 and the beam 13 on the upper floor and the existing wall 12 are cut off at the slits 15 and 16, if seismic force acts on the existing building, the space between the beam 13 on the upper floor and the existing wall 12 Relative displacement occurs. Due to this relative displacement, the panel portion 11a undergoes shear deformation and absorbs seismic energy. As a result, the seismic force borne by the existing wall 12 is reduced, and the shear failure of the existing wall 12 is prevented.

[Second Embodiment]
FIG. 5 shows an overview of the present embodiment, FIG. 6 shows an enlarged view of the panel damper portion, and FIG. 7 shows a cross-sectional view taken along line BB in FIG.
The present embodiment is different from the first embodiment in that beam shapes are formed on both sides of the existing wall 22 and both wall surfaces are not flush with the side surface of the beam 23 on the upper floor.
Therefore, slits 25 and 25 are provided at the boundary between the existing wall 22 and the pillars 24 and 24 on both sides thereof to cut the edges of the existing wall 22 and the pillars 24 and 24, and the existing wall 22 and the upper floor A slit 26 having a width of about 200 to 300 mm is provided at the boundary with the beam 23, and the panel damper 21 is installed between the upper end surface 22a of the existing wall 22 and the bottom surface 23a of the beam 23 on the upper floor (see FIG. 7).

The panel damper 21 is H-shaped in cross-section, and extends between a pair of opposed flange plates 21b and 21c in the form of strips and the pair of flange plates 21b and 21c, and is formed of extremely low yield point steel. It is comprised roughly from the strip-shaped panel part 21a. A plurality of stiffening ribs 21d are arranged between the pair of flange plates 21b and 21c with a predetermined spacing in the longitudinal direction of the panel damper 21 in order to prevent local buckling of the panel portion 21a. Yes.
The panel damper 21 is installed on the upper surface 22a of the existing wall 22 and the bottom surface 23a of the beam 23 on the upper floor with mortars 28 and 28, respectively, and the flange plates 21b and 21c are connected to the upper surface 22a of the existing wall 22 Each of the beams 23 is fixed to the bottom surface 23a of the beam 23 with an anchor bolt 29.

  In the seismic retrofit structure of an existing building according to the present embodiment, the boundary between the existing walls 12 and 22 and the columns 14 and 24 integrated with the existing walls 12 and 22 and the beams 13 and 23 on the upper floor is respectively provided. Slits 15, 16, 25 and 26 are provided, and panel dampers 11 and 21 are installed between the existing walls 12 and 22 and the upper floor beams 13 and 23, so that the weight of the building does not increase and effective space is increased. It will not be damaged. In particular, when one of the wall surfaces 12b and the side surface 13b of the upper floor beam 13 are flush with each other, the upper edge of the existing side wall 12 on the side and the upper floor beam 13 below Since the notches 17 of 45 degrees obliquely in the sectional view are provided at the edges, and the panel damper 11 is installed in the notches 17, the width of the slit 16 between the existing wall 12 and the beam 13 on the upper floor is increased. Construction can be done easily because it can be minimized. In addition, since the notch portion 17 has the inclined surfaces 12a and 13a having an inclination angle of 45 degrees, the anchor bolt 19 can be easily driven.

  The panel dampers 11 and 21 can freely adjust the resistance by changing the area of the panel portions 11a and 21a. Thereby, the burden of the existing walls 12 and 22 can be reduced, and the shear failure of the existing walls 12 and 22 can be prevented.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit thereof. For example, in the first embodiment, only one surface of the existing wall and the upper floor beam is flush, but the wall thickness of the existing wall and the beam width of the upper floor beam are the same, and both surfaces are flush. It goes without saying. In the second embodiment, a slit having an equal width (about 200 to 300 mm) is provided between the existing wall and the beam on the upper floor, but only a portion where the panel damper is installed has a width of about 200 to 300 mm. It is good also as a slit and it is good also as a slit of a slight clearance gap in other parts. In short, it is only necessary to obtain the desired function in the present invention.

It is a general-view figure which shows 1st embodiment of the damping control structure of the existing building which concerns on this invention. It is an enlarged view of the panel damper part in FIG. It is AA arrow sectional drawing in FIG. It is a perspective view of a panel damper. It is a general-view figure which shows 2nd embodiment of the damping control structure of the existing building which concerns on this invention. It is an enlarged view of the panel damper part in FIG. It is BB arrow sectional drawing in FIG.

Explanation of symbols

11, 21 Panel damper (damping device)
12, 22 Existing walls 13, 23 Upper floor beams 14, 24 Pillars 15, 16, 25, 26 Slit 17 Notch 18, 28 Mortar 19, 29 Anchor bolt

Claims (2)

A slit is provided at each boundary between the existing wall in which at least one wall surface is flush with the side of the beam on the upper floor, the pillar integrated with the existing wall, and the beam on the upper floor. In the existing building, the upper edge of the one wall surface and the lower edge of the side surface of the beam are provided with oblique notches in an elevational cross-sectional view, and a vibration control device is installed in the notches. A damping control structure,
The damping device has a substantially same inclination angle as the inclined surface formed in the notch, and a pair of flange plates fixed to the inclined surface, respectively, and a panel portion extending between the pair of flange plates An anti-seismic reinforcement structure for existing buildings. The seismic reinforcement structure for an existing building according to claim 1 , wherein the panel portion is made of extremely low yield point steel, and a stiffening rib is disposed between the pair of flange plates.

Images