JP2000001999A - Vibration control reinforcement structure for existing building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To additionally provide a reinforcement structure surface in which a vibration control device is assembled in an opening part surrounded by columellas and beams while securing an opening for an entrance, and improve seismic performance of an existing building by additionally providing a less number of reinforcement elements by absorbing input energy of an earthquake by the vibration control device in reinforcing the existing building. SOLUTION: A stud 5 of steel is disposed in an opening part 4 surrounded by columellas 1, 1 and beams 2, 3 in an existing building. An upper end of the stud 5 is fixed to a reinforcing steel plate 7 spliced and fixed to a side surface of the upper beam 2, a lower end of the stud 5 is fixed to a floor slab 1 by a post-construction anchor 12, resin binding agent or the like, the stud 5 is separated to an upper part and a lower part, an upper and a lower studs 5-1, 5-2 are connected to each other by a vibration control element such as an elastoplastic damper 6 or the like to construct a stud type vibration control reinforcement structual surface, and openings 4a, 4b as entrances or the like are secured on both sides of the stud 5, thereby earthquake energy is absorbed by deformation of the elastoplactic damper 6 or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-seismic structure for an existing building having low seismic resistance by adding a reinforcing element incorporating a vibration control device to the existing building to control the existing building. It is.

[0002]

2. Description of the Related Art Conventionally, when an existing reinforced concrete building with low seismic resistance is seismically reinforced, a method of adding a seismic element incorporating a new wall or a steel frame brace has been adopted. .

[0003] However, in particular, when it is attempted to reinforce earthquake resistance inside a building, entrances to corridors and rooms cannot be secured in order to secure the required number of reinforcing structures, and as a result, the usability of the building is significantly reduced. There was a problem that there were many.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a reinforcement structure incorporating a vibration control device in an opening surrounded by columns and beams of an existing building. It is possible to secure additional openings for use, etc.
An object of the present invention is to provide a seismic control reinforcement structure of an existing building that can improve the seismic resistance of an existing building by adding a few reinforcing elements by absorbing energy input to the building by the earthquake with a vibration control device. .

[0005]

The present invention provides a seismic control and reinforcement structure for an existing building, in which a steel stud is arranged at an opening surrounded by columns and beams of the existing building, and a side wall of the upper beam is attached. The upper end of the stud is fixed to the reinforcing steel plate that is in contact with and fixed, and the lower end of the stud is fixed to the floor slab with a post-installed anchor or resin adhesive, and the stud is separated vertically and the upper and lower studs are Plastic damper,
Oil damper, viscous damper, viscoelastic damper, etc.)
(See claim 1: FIGS. 1 and 2).

[0006] A stud-type seismic damping reinforcement structure incorporating a damping element is formed at the center of an opening surrounded by columns and beams, and is provided on both left and right sides for entrances to corridors and rooms. An opening is easily secured. When the building itself is deformed by the earthquake, the damping element is also deformed at the same time, and this damping element absorbs vibration energy by deformation and exerts a damping effect, and even if the number of reinforcement The earthquake resistance of the building can be improved. By installing the damping element near the lower end, the bending moment at the lower end of the stud becomes smaller, so that it is possible to design post-installed anchors or resin adhesive to fix the stud to the floor slab. Can be secured in a single plane.

If the existing beam has no sufficient strength, a reinforcing steel plate having a substantially U-shaped cross section is used to shear or bend the entire side surfaces and lower surface of the upper beam over the entire length. 3), the upper part of the upper stud is fixed to this reinforcing steel plate, and the construction of a stud type seismic control structure can be realized.

Further, when the existing beams have no proof strength and it is difficult to reinforce the beams due to the existence of floor slabs, etc., stress is applied to both ends of the reinforcing steel plate attached to the entire length of the upper beams to the columns. A transmitting column fixing member is provided (refer to claim 3: FIGS. 4 and 5). In other words, the additional stress due to the damping element is processed by the reinforcing steel plate on the side of the beam, and the additional stress is transmitted directly to the column via the reinforcing steel plate and the column anchoring member, enabling the construction of a stud-type seismic control reinforcement structure. (See FIG. 6).

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 shows a basic embodiment of a vibration damping reinforcement structure in an existing reinforced concrete building of the present invention. FIG. 2 shows the details of the upper beam / lower beam joint of the seismic control reinforcement structure.

In FIG. 1, steel studs 5 are additionally provided at the center of an opening 4 surrounded by columns 1, 1 and beams 2, 3 in an existing reinforced concrete frame. Openings 4a and 4b for entrances and the like are secured, the studs 5 are vertically divided, and the upper studs 5-1 fixed to the upper beam 2 and the lower studs 5-2 fixed to the lower beam 3 are elastic-plastically damped. They are connected to absorb seismic energy.

As shown in FIG. 2, for example, the steel stud 5 includes a steel plate 5a having a predetermined width, an integral vertical rib 5b for reinforcing the steel plate 5a at both ends and an intermediate portion, and a horizontal rib on an upper portion of the steel plate 5a. An upper steel frame 5c made of an I-shaped steel and a lower steel frame 5d made of a T-beam or the like constituting the lower part of the steel plate 5a, and the lower steel frame 5d is separated from the upper stud 5-1 for the reason described later. The lower stud 5-2 is used. In addition, although the case where the stud 5 is made of a steel plate, a vertical rib, a steel frame material or the like is shown, it is needless to say that the present invention is not limited to this and other structures and shapes can be adopted.

The upper stud 5-1 is rigidly connected to a pair of reinforcing steel plates 7 attached to and fixed to both side surfaces of the upper beam 2. The reinforcing steel plate 7 has its upper part 7a adhered to the side surface of the upper beam 2 with a resin adhesive or mortar 8,
To the upper beam 2. The lower portion 7b of the reinforcing steel plate 7 projects downward from the lower surface of the upper beam 2, and the lower portion 7b clamps the upper steel frame 5c of the upper stud 5-1 from both sides.
b and the flange of the upper steel frame 5c are fastened with bolts 10.

The lower steel frame 5d as the lower stud 5-2 is
It is fixed to the lower beam 3 and the floor slab 11 with the post-installed anchor 12. Here, since the post-installed anchor generally has a low tensile strength, direct joining of the lower stud to the floor slab has low resistance to bending moment. Therefore, the position where the vibration damping device is incorporated, that is, the dividing position of the stud 5 is set to a position close to the lower end, and the bending moment acting on the joint of the lower stud 5-2 to the floor slab 11 is reduced.

An appropriate gap is formed between the upper stud 5-1 and the lower stud 5-2, and both are connected by an elastic-plastic damper 6 as a vibration damping device. The elasto-plastic damper 6 has, for example, a honeycomb-shaped hole 6b in the middle of a steel plate 6a (see FIG. 1), and has an upper stud 5-1.
The steel plate 5a and the web of the lower stud 5-2 are sandwiched between the steel plates 6a and fastened with bolts 13 (see FIG. 2C). Also,
The elasto-plastic dampers 6 are provided in two sets in the longitudinal direction of the beam. The vibration damping device is not limited to this, and other elasto-plastic dampers, oil dampers, viscous dampers, viscoelastic dampers, and the like can be used.

Next, in the example shown in FIG. 3, in the seismic damping reinforcement structure similar to FIGS. 1 and 2, when the strength of the existing beam is small, the beam breaks before the damper is effective. The upper beam 2 is reinforced by shearing and bending with a reinforcing steel plate 20 having a substantially U-shaped cross section over the entire length. The reinforcing steel plate 20 includes a pair of steel plates 21 adhered to both sides of the upper beam 2 with a resin adhesive or mortar 23,
A groove-shaped steel member 22 fitted between the lower portions of the steel plates 21 and fastened with bolts 24 and adhered to the lower surface of the upper beam 2 with a resin adhesive or mortar 23, and from above the floor slab 11 on the upper floor. The tie bar 25 is attached and has both ends fixed to the upper ends of the pair of steel plates 21.

The steel frame 2 below the reinforcing steel plate 20
The upper steel frame 5c of the upper stud 5-1 is inserted into 2 and fixed with bolts or the like (not shown). Other configurations are the same as those in the examples of FIGS.

The example shown in FIGS. 4 and 5 is used for treating an additional stress by a damper when the existing beam has a small proof stress and the beam cannot be sufficiently reinforced by shearing or bending due to the presence of a floor slab or the like. A steel plate is used for transmitting the stress directly to the column. The shape of the reinforcing steel plate 30 of the upper beam 2 is
It is almost the same as the above-mentioned reinforcing steel plate, and a pair of steel plates 31 and a grooved steel frame material 32 are used to make a reinforcing steel plate having a substantially U-shaped cross section.
The upper part of the reinforcing steel plate 30 is attached to both side surfaces of the upper beam 2 with a buckling anchor 35 and a resin adhesive or mortar 33, and both ends in the longitudinal direction thereof are fixed to the left and right columns 1, 1.
Other configurations are the same as those in the examples of FIGS.

The fixing of the reinforcing steel plate 30 to the columns 1 and 1 is performed, for example, by a method as shown in FIG. In Example 1 of FIG.
When viewed from a plane, an L-shaped end 40 covering the corner of the column 1 is integrally provided at an end of the steel plate 31 of the reinforcing steel plate 30, and a resin adhesive or mortar is provided between the L-shaped end 40 and the column 1. 33 are filled and fixed by the post-installed anchor 41.

In Example 2 of FIG. 5B, a steel plate 42 is provided on the surface of the column 1 on the opening 4 side, and the upper end of the steel plate 42 is attached to the reinforcing steel plate 3.
The steel plate 42 and the column 1 are fixed to the lower surface at both ends of the base member 0 by welding or the like, using a post-installed anchor 44 and a resin adhesive or mortar 45. The steel plate 42 may be partially disposed under the beam, or may extend over the floor slab. FIG.
In Example 3 of (c), a steel frame member 43 made of a shaped steel is used, and the column 1 is connected to a post-installed anchor by mortar or only mortar. Other configurations are the same as those in FIG.

FIG. 6 shows the stress distribution of each member on the seismic control reinforcement surface shown in FIGS. 4 and 5, and the additional stress from the elasto-plastic damper 6 is used to reinforce the studs 5 and the side surfaces of the beam. The beam is transmitted to the column 1 by the steel plate 30 and is added to the stress distribution of the existing frame, whereby a stud-type seismic control structure having the stress distribution shown in the upper part of FIG. 6 is obtained.

[0021]

According to the present invention, the seismic control and reinforcement structure of an existing building is
A steel stud is placed in the opening surrounded by the pillars and beams of the existing building, and the upper end of the stud is fixed to the reinforcing steel plate attached to the side of the upper beam and fixed to the floor slab. Since the studs are fixed vertically with a construction anchor, a resin adhesive, or the like, and the studs are vertically separated from each other, and the upper and lower studs are connected by a damping element, the following effects are obtained. (1) A stud-type seismic control reinforcement structure incorporating a vibration control element is formed at the center of the opening surrounded by columns and beams, etc., on both left and right sides for entrances to corridors and rooms. Since the opening is easily secured, it is possible to prevent a decrease in the usability of the conventional building. (2) When the building itself is deformed by the earthquake, the damping element is also deformed at the same time, and this damping element absorbs vibration energy by the deformation and exerts the damping effect, and the number of additional reinforcement structures is small. Also, since the seismic resistance of the existing building can be improved, the usability of the building is improved, and a relatively inexpensive reinforcing structure for the existing building can be obtained. (3) It is possible to easily cope with the case where the strength of existing beams is not enough and it is difficult to reinforce the shearing or bending of beams.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of a vibration damping reinforcement structure for an existing building according to the present invention.

FIG. 2 (a) is a front view showing details of an upper beam joint of FIG. 1,
(b) is a sectional view taken along the line IIb-IIb in FIG. 1, and (c) is a sectional view taken along the line IIc-II in FIG.
It is IIc sectional drawing.

FIG. 3 is a second embodiment of the seismic control and reinforcement structure for an existing building according to the present invention, wherein (a) is a front view and (b) is a cross-sectional view taken along the line bb of (a).

FIG. 4 is a third embodiment of the seismic control and reinforcement structure for an existing building according to the present invention, in which (a) is a front view and (b) is a cross-sectional view taken along line bb of (a).

5A and 5B are various examples of a method of fixing a steel plate to a column at a beam end portion in FIG. 4, in which FIG. 5A is a plan view, and FIGS. 5B and 5C are front views.

FIG. 6 is a schematic diagram showing a stress distribution on the seismic control reinforcement surface of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Column 2 ... Upper beam 3 ... Lower beam 4 ... Opening 4a ... Opening 4b ... Opening 5 ... Stud 5-1 ... Upper stud 5-2 ... Lower stud 6 ... Elastic-plastic damper (vibration control Element) 7 Reinforced steel plate 8 Resin adhesive or mortar 9 Penetration bolt 10 Bolt 11 Floor slab 12 Post-installed anchor 13 Bolt 20 Reinforced steel plate 21 Steel plate 22 ... Steel frame material 23 ... Resin adhesive or mortar 24 ... Bolt 25 ... Tie bar 30 ... Reinforced steel plate 31 ... Steel plate 32 ... Steel frame material 33 ... Resin adhesive or mortar 34 ... Bolt 35 ... Buckling Stop anchor 40 L end 41 41 Post-installed anchor 42 Steel plate 43 Steel frame 44 Post-installed anchor 45 Resin adhesive or mortar

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shunichi Yamada 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Tomohiko Arita 1-2-7 Moto-Akasaka, Minato-ku, Tokyo No. Kashima Construction Co., Ltd. (72) Inventor Norio Suzuki 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Yasushi Kurokawa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo No. Kashima Construction Co., Ltd. (72) Inventor Akihiro Kunimatsu 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. F-term (reference) 2E176 AA00 BB28

Claims (3)

[Claims] 1. A steel stud is placed in an opening surrounded by pillars and beams of an existing building, and the upper end of the stud is fixed to a reinforcing steel plate attached to and fixed to the side surface of the upper beam, and the lower end of the stud Is a seismic control reinforcement structure for existing buildings, which is fixed to a floor slab, this stud is separated vertically, and the upper and lower studs are connected by a damping element. 2. The seismic control and reinforcement structure for an existing building according to claim 1, wherein the reinforcing steel plate has a substantially U-shaped cross section for reinforcing both sides and a lower surface of the upper beam over the entire length. 3. The seismic control reinforcement of an existing building according to claim 1, wherein a column anchoring member for transmitting stress to the column is provided at both ends of the reinforcing steel plate attached to the entire length of the upper beam. Construction.