JP2020101050A - Seismic reinforcement structure - Google Patents

Abstract

To provide a seismic reinforcement structure capable of effectively improving the seismic performance of a building while suppressing an increase in column axial force that occurs during an earthquake or the like as much as possible.SOLUTION: A seismic resistant element 10 with a gap that does not act on interlayer deformation of a predetermined gap amount or less but acts on interlayer deformation exceeding the gap amount is arranged on the vertical structure surface of a building 1. A damping mechanism 20 that applies a damping force to the interlayer deformation is arranged on a vertical structure surface different from the vertical structure surface on which the seismic resistant element 10 with a gap is arranged.SELECTED DRAWING: Figure 1

Description

The present invention relates to a seismic reinforcement structure that reinforces a building by providing a seismic element and a damping mechanism on a vertical structure surface of the building.

In Patent Document 1, stiffening braces as seismic resistant elements are arranged on the vertical construction planes of each floor except the lowest floor of the building, and an oil damper as a damping mechanism for imparting damping force to interlayer deformation is provided on the lowest floor. A seismic reinforcement structure for a building arranged on a vertical structure is disclosed.
In this seismic reinforcement structure, stiffening braces as seismic resistant elements placed on each floor except the lowest floors increase the rigidity of each floor except the lowest floors to suppress inter-story deformation, and the inter-story deformation increases correspondingly. Since the vibration can be intensively damped by the oil dampers on the floor, the cost can be reduced and the building can be reinforced efficiently compared to the case where the oil dampers as the damping mechanism are arranged on the vertical structure surface of each floor. ..

Japanese Patent Laid-Open No. 2000-087589

However, in the seismic reinforcement structure of Patent Document 1, the stiffening braces increase the rigidity of each floor except the lowest floor of the building, and the natural period of the building changes significantly. Therefore, the axial force of the column generated during an earthquake may be large, and it may be necessary to reinforce the column.

In view of this actual situation, a main object of the present invention is to provide a seismic strengthening structure capable of effectively improving the seismic performance of a building while suppressing an increase in column axial force that occurs during an earthquake or the like as much as possible.

A first characteristic configuration of the present invention is that a seismic resistant element with a gap, which does not act on inter-story deformation below a predetermined gap amount but acts on inter-story deformation exceeding the gap amount, is provided on a vertical structure surface of a plurality of floors of a building. Placed,
A damping mechanism that applies a damping force to the inter-story deformation is located on a vertical construction surface different from the vertical construction surface on which the seismic element with a gap is arranged.

According to this configuration, by adopting a combination of a seismic element with a gap and a damping mechanism, the rigidity of the building is not increased until a mid-earthquake when the inter-story deformation of each floor is less than the gap amount. The seismic energy can be absorbed by the damping mechanism.
Then, at the time of a large earthquake where the interlayer deformation of at least some floors exceeds the gap amount, seismic elements with gaps on only some floors that prevent the interlayer deformation exceed the gap amount prevent the interlayer deformation of only some floors. However, the damping mechanism can absorb the seismic energy.
Therefore, it is possible to effectively improve the seismic performance of the building while suppressing the increase in the axial force of the column that occurs during an earthquake or the like as much as possible.

According to a second characteristic configuration of the present invention, a plurality of the seismic resistant elements with the gaps are concentratedly arranged on the upper layer side of the building,
The plurality of the damping mechanisms are concentrated on the lower layer side of the building.

According to this configuration, seismic elements with gaps are centrally arranged on the upper side of the building where the input of seismic energy does not increase so much, and multiple damping mechanisms are centrally arranged on the lower side of the building with high energy absorption efficiency. The seismic element can efficiently absorb the seismic energy while suppressing the inter-layer deformation of each floor on the upper layer side to the gap amount or less, and the seismic performance can be further enhanced.

A third characteristic configuration of the present invention is that the seismic resistant element with a gap and the damping mechanism are alternately arranged on a vertical structure plane of each layer of a building.

According to this configuration, since the seismic resistant element with the gap and the damping mechanism are alternately arranged for each layer of the building, the behavior in the vertical direction of the building during an earthquake can be easily aligned, and a part of the vertical direction of the building can be easily damaged. Seismic performance can be improved more effectively while avoiding the weak point of time.

A fourth characteristic configuration of the present invention is that the seismic resistant element with a gap and the damping mechanism are arranged on the same floor of a building.

According to this configuration, since the seismic element with a gap and the damping mechanism are arranged on the same floor of the building, the seismic element with a gap and the damping mechanism are separated when the influence of higher-order modes on the building response is large. On each floor to be placed, it is possible to enjoy both the seismic action by the seismic element with a gap and the seismic action by the damping mechanism, and the seismic performance can be further enhanced.

Sectional drawing which shows the seismic-proof reinforcement structure of 1st Embodiment typically. Sectional view showing seismic element with gap Sectional drawing which shows the seismic-proof reinforcement structure of 2nd Embodiment typically. Sectional drawing which shows the seismic-proof reinforcement structure of 3rd Embodiment typically.

An embodiment of a seismic reinforcement structure of the present invention will be described with reference to the drawings.
[First Embodiment]
As shown in FIG. 1, this seismic retrofit structure does not act on interlayer deformation below a predetermined gap amount G (see FIG. 2) but acts on interlayer deformation exceeding the gap amount G. The elements 10 are arranged on the vertical floors of the building 1 on multiple floors. Further, the damping mechanism 20 that applies a damping force to the inter-story deformation of the building 1 is arranged on a vertical joint surface different from the vertical joint surface on which the seismic element with a gap 10 in the building 1 is arranged. The vertical construction plane of the building 1 is a vertical construction surrounded by a pair of columns 2 that are adjacent in the left-right direction (horizontal direction in the construction plane) and a pair of beams 3 that are adjacent in the vertical direction (vertical direction in the construction plane). It is a rectangular surface.

As shown in FIG. 1, the damping mechanism 20, for example, installs a V-shaped frame 21 made of steel material on one side or the like of vertically adjacent beams 3 in the vertical construction plane of the building 1 and A damper 22 and the like are installed between the tip portion and the like of the body 21 and the pillar 2. The damper 22 is a velocity-dependent oil damper or viscous damper that applies a damping force to the deformation speed of the building 1 between layers, or a displacement-dependent hysteresis system damper (a damper that applies a damping force to the displacement of the building 1 during the layer deformation). Various materials such as lead dampers) can be appropriately used.

The details of the seismic resistant element with a gap 10 will be described later. For example, one end side of a brace member 11 made of steel or the like, which is obliquely arranged on the vertical structure surface of the building 1, is left or right within a predetermined range corresponding to the gap amount G. It can be mounted so as to be movable in any direction.

In this way, by combining the seismic resistant element 10 with a gap and the damping mechanism 20, the rigidity of the building 1 is increased until a middle earthquake when the interlayer deformation of each floor of the building 1 is the gap amount G (see FIG. 2) or less. The seismic energy can be absorbed by the damping mechanism 20 in the absence state (the state in which the natural period is not changed). Then, at the time of a large earthquake in which the interlayer deformation of at least some floors exceeds the gap amount G, the seismic resistant elements with gaps 10 of only some floors in which the interlayer deformation exceeds the gap amount G are made to act, and only those floors By preventing the inter-layer deformation of the column, the damping mechanism 20 can absorb the seismic energy while suppressing the increase in the column axial force generated in the column 2.
Therefore, the seismic performance of the building 1 can be effectively improved while suppressing the increase of the column axial force generated at the time of an earthquake or the like as much as possible.

The building 1 targeted for seismic retrofitting may be either an existing building or a new building, but this seismic retrofitting structure, as described above, suppresses an increase in column axial force that occurs during an earthquake as much as possible. Since the damping mechanism 20 can absorb the seismic energy, it is suitable for use in a seismic retrofitting method for seismically reinforcing an existing building by additionally disposing the seismic resistant element 10 with a gap and the damping mechanism 20 to the existing building. be able to.

In the first embodiment, as shown in FIG. 1, the seismic resistant elements 10 with gaps are centrally arranged on the upper layer side 1A of the building 1 where the input of seismic energy does not increase so much, and the lower layer side 1B of the building 1 having high energy absorption efficiency. The damping mechanism 20 is centrally arranged. In the illustrated example, two (a plurality of examples) seismic resistant elements with gaps 10 are arranged on each floor of the eighth floor and above as the upper layer side 1A of the building 1, and two on each floor below the seventh floor as the lower layer side 1B of the building 1 ( A plurality of examples) of damping mechanism 20 are arranged, the number of floors on the upper layer side 1A is larger than the number of floors on the lower layer side 1B, and the number of gapped seismic resistant elements 10 is larger than that of the damping mechanism 20. By the way, conversely, the damping mechanism 20 may be larger than the seismic resistant element 10 with a gap, and the damping mechanism 20 and the seismic resistant element 10 with a gap may be the same number.
With such a configuration, the seismic energy can be efficiently absorbed by the damping mechanism 20 while suppressing the interlayer deformation of each floor of the upper layer side 1A by the gap amount G or less in the seismic resistant element 10 with a gap, thereby further improving the seismic performance. Can be increased.

In the illustrated example, the seismic resistant element 10 with a gap and the damping mechanism 20 are arranged in the left-right direction on each floor so as to be at the same position in the lateral direction of the building 1, but the seismic resistant element 10 with a gap and The arrangement of the damping mechanism 20 on each floor can be appropriately changed.
For example, the seismic resistant element with a gap 10 and the damping mechanism 20 may be arranged on each floor so that the floors adjacent to each other in the vertical direction are located at different positions in the horizontal direction of the building 1, or adjacent to each other in the horizontal direction on each floor. May be arranged.
Furthermore, the number of installed seismic resistant elements 10 with damping and damping mechanisms 20 on each floor can be changed as appropriate, and the number of installed seismic resistant elements 10 with damping and damping mechanisms 20 in the entire building 1 can also be modified appropriately.
In addition, for example, the beams of some floors on the lower layer side 1B on which the damping mechanism 20 is arranged are removed to facilitate interlayer deformation at the time of an earthquake, etc. A large damping mechanism 20 may be arranged.

Next, a specific configuration of the seismic resistant element 10 with a gap will be described.
The structure of the seismic resistant element 10 with a gap described below is merely an example, and an appropriate structure can be adopted according to various circumstances such as the state of the building 1 targeted for seismic reinforcing and the seismic reinforcing level. ..

As shown in FIG. 2, in constructing the seismic resistant element 10 with a gap, the vertical construction surface side of the upper and lower intermediate portions of each pillar 2 constituting the vertical construction surface of the building 1 and the left and right intermediate portions of each beam 3 are formed. On each of the vertical structure surfaces, a steel material mounting portion 13 having a circular insertion hole (not shown) for mounting the brace material 11 with a gap by the connecting bolt 12 is formed in a protruding manner.
Then, both ends of the four brace members 11 are attached to the attaching portion 13 with connecting bolts 12 and nuts (not shown) while straddling the joint portions 4 at the four corners of the vertical construction surface of the building 1.
Therefore, in the event of an earthquake or the like, the vertical structure surface of the building 1 can be reinforced while avoiding the addition of stress due to the brace material 11 with the gap to the joint portion 4 where stress concentration is likely to occur.

A circular bolt hole 11a having a hole diameter corresponding to the bolt diameter of the connecting bolt 12 is formed at the lower end of each brace member 11, and the connecting bolt 12 and the nut are attached around an axis orthogonal to the vertical construction plane. It is rotatably connected to the portion 13.
An elongated hole 11b is formed at an upper end of each brace member 11 to allow the connecting bolt 12 to move in the left-right direction in a predetermined range corresponding to the gap amount G in the left-right direction. The upper end of each brace member 11 is connected to the mounting portion 13 by a connecting bolt 12 and a nut so as to be movable in the left-right direction within a predetermined range and rotatable about an axis orthogonal to the vertical joint surface.

Therefore, in the seismic resistant element 10 with a gap, when the interlayer deformation of the floor in which it is arranged is less than the gap amount G, the connecting bolt 12 at the upper end of each brace member 11 has a gap along the long hole 11b. By moving in the left-right direction within a predetermined range corresponding to the amount G, it is possible to appropriately allow the interlayer deformation without exerting the brace effect.
On the other hand, in the seismic resistant element with a gap 10, when the interlayer deformation of the floor on which it is arranged exceeds the gap amount G, the connecting bolt 12 at the upper end of each brace member 11 has the left and right ends of the elongated hole 11b. By abutting and pressing the portion, the brace effect can be exerted and interlayer deformation can be appropriately prevented.

[Second Embodiment]
FIG. 3 shows a seismic reinforcement structure of the second embodiment. The seismic reinforcement structure of the second embodiment is another embodiment of the arrangement pattern of the seismic resistant element 10 with a gap and the damping mechanism 20.
In the seismic reinforcement structure of the second embodiment, the seismic resistant element 10 with a gap and the damping mechanism 20 are alternately arranged for each layer of the building 1. In the illustrated example, two (a plurality of examples) damping mechanisms 20 are arranged on the odd floors 1C of the building 1, and two (a plurality of examples) seismic resistant elements 10 with gaps are arranged on the even floors 1D of the building 1. ..
Therefore, the behavior of the building 1 in the vertical direction is easily aligned during an earthquake or the like, and it is possible to effectively improve the seismic performance while avoiding a part of the building 1 in the vertical direction from becoming a weak point.
Contrary to the above configuration, the seismic resistant element 10 with a gap may be arranged on the odd floor 1C of the building 1 and the damping mechanism 20 may be arranged on the even floor 1D of the building 1. Further, the number of installed seismic resistant elements with a gap 10 or damping mechanism 20 on each floor can be changed as appropriate, and the number of installed seismic resistant elements 10 with a gap or damping mechanism 20 in the entire building 1 can also be changed appropriately.
Since other configurations are the same as the configurations described in the first embodiment, the same components will be denoted by the same reference numerals, and the description thereof will be omitted.

[Third Embodiment]
FIG. 4 shows the seismic retrofit structure of the third embodiment. The seismic retrofit structure of this 3rd Embodiment is another embodiment of the arrangement pattern of the seismic resistant element 10 with a gap, and the damping mechanism 20.
In the seismic retrofit structure of the third embodiment, the seismic resistant element with gap 10 and the damping mechanism 20 are arranged on the same floor of the building 1. In the illustrated example, one seismic element with a gap 10 and one damping mechanism 20 are arranged on different vertical structures in the left and right directions on each floor of the building 1.
Therefore, in the case where the influence of the higher-order mode on the building response is large, etc., the seismic action of the seismic element 10 with a gap and the damping mechanism 20 are used in each floor of the building 1 where the seismic element with a gap 10 and the damping mechanism 20 are arranged. It is possible to enjoy both seismic resistance, and it is possible to further enhance seismic performance.
The number of the seismic resistant elements 10 with gaps and the damping mechanism 20 installed on each floor can be appropriately changed to a plurality or different numbers other than the same number. Further, the number of installed seismic resistant elements with gaps 10 and damping mechanisms 20 in the entire building 1 can be changed as appropriate.
Since other configurations are the same as the configurations described in the first embodiment, the same components will be denoted by the same reference numerals, and the description thereof will be omitted.

[Another embodiment]
Another embodiment of the present invention will be described. The configurations of the respective embodiments described below are not limited to being applied individually, but may be applied in combination with the configurations of other embodiments.

(1) In the above-described embodiment, the case where the seismic resistant element with gap 10 and the damping mechanism 20 are arranged on each floor of the building 1 has been described as an example, but the upper and lower sides of the building 1 such as the upper layer side, the lower layer side, and the upper and lower middles. The seismic resistant element 10 with a gap and the damping mechanism 20 may be arranged on some floors in the direction.

(2) The specific configurations and arrangements of the seismic resistant element 10 with a gap and the damping mechanism 20 are not limited to the configurations and arrangements shown in the above-described embodiment, and various configurations and arrangements can be appropriately adopted. ..

1 Building 10 Seismic element with a gap 20 Damping mechanism B Building

Claims (4)

A seismic resistant element with a gap that does not act on interlayer deformation below a predetermined gap amount but acts on interlayer deformation exceeding the gap amount is arranged on the vertical construction plane of the building,
A seismic strengthening structure in which a damping mechanism for imparting damping force to interlayer deformation is arranged on a vertical structure surface different from the vertical structure surface on which the gap-resistant seismic element is arranged. A plurality of the seismic resistant elements with the gaps are centrally arranged on the upper layer side of the building,
The seismic reinforcement structure according to claim 1, wherein the plurality of damping mechanisms are concentratedly arranged on a lower layer side of a building. The seismic reinforcement structure for a building according to claim 1, wherein the seismic element with a gap and the damping mechanism are alternately arranged for each layer of the building. The seismic reinforcement structure according to claim 1, wherein the seismic element with a gap and the damping mechanism are arranged on the same floor of a building.

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