JP3972892B2 - Seismic retrofit method for existing buildings - Google Patents

Seismic retrofit method for existing buildings Download PDF

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JP3972892B2
JP3972892B2 JP2003377031A JP2003377031A JP3972892B2 JP 3972892 B2 JP3972892 B2 JP 3972892B2 JP 2003377031 A JP2003377031 A JP 2003377031A JP 2003377031 A JP2003377031 A JP 2003377031A JP 3972892 B2 JP3972892 B2 JP 3972892B2
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JP2005139722A (en
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和浩 金田
澄夫 前沢
実 小山
裕美 鈴木
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大成建設株式会社
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本発明は、既存建物に制震装置を増設することにより、当該建物の耐震性能を向上させる既存建物の制震改修方法に関するものである。   The present invention relates to a seismic retrofitting method for an existing building that improves seismic performance of the building by adding a damping device to the existing building.
近年、各種の既存の建物において、地震時における安全性を確保するために、柱と梁とによって構成された架構に、ブレースを対角方向やV字状、逆V字状等に増設して当該架構の剛性を高める耐震補強が行われている。
ところが、上記既存建物に対する耐震補強においては、ブレースの軸方向強度によって、架構の耐震性を高めることはできるものの、地震時等に建物に発生する振動に対する減衰効果を有していないために、制震効果を期待することはできない。
In recent years, in various existing buildings, in order to ensure safety in the event of an earthquake, braces have been added diagonally, V-shaped, inverted V-shaped, etc. to a frame constructed of columns and beams. Seismic reinforcement is performed to increase the rigidity of the frame.
However, in the seismic reinforcement for existing buildings, although the seismic strength of the frame can be increased by the axial strength of the braces, it does not have a damping effect on the vibration generated in the building during an earthquake, etc. The earthquake effect cannot be expected.
このため、従来より、制震効果を利用した耐震改修を行う場合には、既存建物の架構に、オイルダンパ、粘性ダンパ、粘弾性ダンパまたは極低降伏点鋼を用いた弾塑性ダンパ等の制震部材を組み込んだブレースや壁を設けることにより、既存建物に作用する応答振動を抑制しようとする構造が採用されている。   For this reason, in the past, when performing seismic retrofitting using the seismic control effect, oil dampers, viscous dampers, viscoelastic dampers, or elasto-plastic dampers using extremely low yield point steel, etc., are used for the existing building frame. By providing braces and walls incorporating seismic members, a structure that attempts to suppress response vibrations acting on existing buildings has been adopted.
しかしながら、このような既存建物に制震部材を組み込んだブレース等を増設する制震改修方法にあっては、上記制震部材における制震効果が、もっぱら地震時に既存建物の架構に生じる相対変位の量に依存するために、当該既存建物の架構自他の変形能が小さい場合には、所望の制震効果を得ることができないという問題点があった。   However, in such a seismic retrofitting method that adds a brace or the like that incorporates a seismic control member into an existing building, the seismic control effect of the seismic control member is not limited to the relative displacement that occurs in the frame of the existing building. Since it depends on the amount, there is a problem that a desired seismic control effect cannot be obtained when the deformability of the frame of the existing building is small.
そこで、柱・梁のフレームの変形能力を高め、かつ制震装置を用いることにより建物を耐震補強する従来の既存建物の耐震補強方法として、下記特許文献1に示すような技術が提案されている。
この耐震補強方法は、既存建物内の柱とそれに接続する壁の境界部分を斫り、柱と壁間に縦方向にスリットを形成し、柱と壁を実質的に分離させることにより、柱・梁のフレームの変形能力を高めるとともに、両者間の相対水平変位時に減衰性を発揮する制震装置を設置したものである。
特許第3421493号公報
Therefore, a technique as shown in Patent Document 1 below has been proposed as a conventional seismic reinforcement method for an existing building that enhances the deformability of the column / beam frame and uses a vibration control device to seismically strengthen the building. .
This seismic retrofitting method struck the boundary between a pillar in an existing building and the wall connected to it, formed a slit in the vertical direction between the pillar and the wall, and separated the pillar and the wall substantially. It is equipped with a vibration control device that enhances the deformability of the frame of the beam and exhibits damping when the relative horizontal displacement between them.
Japanese Patent No. 3421493
上記従来の既存建物の耐震補強方法によれば、柱と壁を実質的に分離させることにより、壁に発生したひび割れが柱まで貫通することを防止して、柱の体力低下を回避することにより、既存建物の耐震性を向上させることができる。
ところが、上記耐震補強方法によっては、壁の存在を前提としているために、既存建物の壁が存在しない架構には適用することができない。また、変形能力の向上は、柱と壁との境界部分に上記斫りによって形成されたスリットの幅寸法が限度であるために、地震時における大きな変位の増加効果を期待することができず、仮に上記斫りを大きくしてスリットの幅を大きく確保しようとすると、逆に架構としての耐力が低下して所望の耐震効果が得られなくなるという問題点がある。
According to the conventional seismic reinforcement method for existing buildings, by substantially separating the column and the wall, the crack generated in the wall is prevented from penetrating to the column, thereby avoiding a decrease in the physical strength of the column. The earthquake resistance of existing buildings can be improved.
However, since the above-mentioned seismic reinforcement method assumes the existence of a wall, it cannot be applied to a frame in which an existing building wall does not exist. In addition, the improvement of the deformation capacity is limited by the width dimension of the slit formed by the above-mentioned turning at the boundary between the column and the wall, so it cannot be expected to increase the large displacement during the earthquake, If an attempt is made to secure a large slit width by enlarging the above-described curvature, there is a problem that the proof strength of the frame is reduced and a desired seismic effect cannot be obtained.
この発明は、かかる事情に鑑みてなされたもので、地震時における架構の変形能が低い既存建物に対しても、増設した制震装置による制震効果を発揮させることができ、よって優れた耐震性能の向上効果を得ることができる既存建物の制震改修方法を提供することを課題とするものである。   The present invention has been made in view of such circumstances, and can exert the seismic control effect of the installed seismic control device even on an existing building having a low deformability of the frame at the time of the earthquake. It is an object to provide a method for seismic retrofitting of an existing building that can improve performance.
上記課題を解決するために、請求項1に記載の発明は、既存建物の全層数の1/3以下の階層に対して、当該階層の架構を構成する既存の梁を撤去することにより当該架構の地震時の変形量増加するようにし、次いで上記梁が撤去された後の複数の階層の柱および梁によって構成される架構の構面内に、当該複数の階層にわたる制震装置を集中的に配置することを特徴とするものである。なお、既存の部材を撤去する際に、必要である場合には、上記架構に対して、別途靭性補強を施す。 In order to solve the above-mentioned problem, the invention described in claim 1 is directed to removing the existing beams constituting the frame of the hierarchy for a hierarchy of 1/3 or less of the total number of layers of the existing building. as deformation amount during earthquake Frames increases, then into Plane of Frames constituted by posts and beams of the plurality of hierarchy after the beam has been removed, concentrating the vibration control device across the plurality of hierarchies It arrange | positions in a pattern. In addition, when removing an existing member, toughness reinforcement is performed separately with respect to the said frame, if necessary.
さらに、請求項2に記載の発明は、上記制震装置が、上記既存建物の垂直荷重を支承可能であるとともに水平方向に変位可能なブレースと、上記ブレースの水平方向の振動エネルギーを吸収する制震部材とを備えてなることを特徴とするものである。 Further, the invention according to claim 2 is characterized in that the vibration control device is capable of supporting the vertical load of the existing building and horizontally displacing the brace, and the vibration absorbing energy of the brace in the horizontal direction. And a seismic member.
請求項1または2に記載の発明によれば、既存建物において変形を許容できる複数の階層に対して、既存の架構構成部材を撤去して地震時に所望の変形量が生じるようにするとともに、当該階層の架構に制震装置を集中的に配置することにより、地震時に当該階層に生じる大きな変形によって、上記制震装置による制震効果を有効に発揮させることができる。この際に、特定の階層に、変形を集中させているために、一層制震効果を高めることが可能となる。ここで、制震装置を配置する階層を、全層数の1/3以下としたのは、これを超える階層に制震装置を配置した場合には、上述した特定の階層にのみ大きな変形を生じさせて制震効果を高めるという機能が十分に得られなくなるからである。 According to the invention described in claim 1 or 2 , for a plurality of floors that can allow deformation in an existing building, the existing frame structural member is removed so that a desired amount of deformation occurs during an earthquake. By intensively arranging the vibration control device on the frame of the hierarchy, the vibration control effect by the vibration control device can be effectively exhibited by the large deformation that occurs in the hierarchy during the earthquake. At this time, since the deformation is concentrated on a specific level, the vibration control effect can be further enhanced. Here, the level where the vibration control device is arranged is set to 1/3 or less of the total number of layers. When the vibration control device is arranged in a layer exceeding this level, a large deformation is applied only to the specific layer described above. This is because the function of increasing the vibration control effect is not obtained.
さらに、特定の階層に対してのみ、部材の撤去や制震装置の増設を行えば良いために、施工範囲が狭くなり、よって既存建物の他の階層における日常業務に大きな支障を与えることなく、居ながらにしての施工が可能となる。
加えて、施工範囲が狭くて済む結果、耐震改修費用の低減化も図ることができる。
Furthermore, because it is only necessary to remove members or add vibration control devices to a specific level, the construction range is narrowed, so that there is no major hindrance to daily work in other levels of the existing building, Construction can be done without leaving the house.
In addition, as a result of the narrow construction range, it is possible to reduce the cost of seismic retrofit.
なお、上記制震装置を集中配置する階層として、特に上記全層数の1/3以下の階層のうち最も変形能の高い階層を選択すれば、少ない既存部材の撤去によって、所望とする高い変形能を得ることができて好適である。 In addition, if a layer having the highest deformability is selected as a layer on which the seismic control device is centrally arranged, particularly a layer having the highest deformability among the layers of 1/3 or less of the total number of layers, a desired high deformation can be achieved by removing a small number of existing members. Performance can be obtained.
さらに、請求項2に記載の発明によれば、地震時に架構が変形した際に、上記ブレースが水平方向に変位し、その振動エネルギーを制震部材が吸収することにより、制震効果を発揮することができる。加えて、万一大きな変形が生じて、既存の柱による軸力支承を失った場合においても、上記ブレースによって当該軸力を支承する、いわゆるフェイルセーフ機能が発揮されることにより、建物の崩壊を防ぐことができる。 Furthermore, according to the invention described in claim 2 , when the frame is deformed at the time of the earthquake, the brace is displaced in the horizontal direction, and the vibration damping member absorbs the vibration energy, thereby exhibiting the vibration control effect. be able to. In addition, in the unlikely event that a large deformation occurs and the axial force support by the existing pillars is lost, the so-called fail-safe function that supports the axial force by the brace is exerted, so that the building collapses. Can be prevented.
図1〜図5は、本発明に係る既存建物の制震改修方法の一実施形態を説明するためのもので、図5が当該耐震改修を施工する前の既存建物1の構造を示す縦断面図である。なお、改修前の2階の平面図は、例えば図3に示す階のものと同様である。
このような既存建物1に対して、制震装置を増設する耐震改修を施す場合には、先ず既存建物1において変形を許容できる複数の階層(但し、全層数の1/3以下の階層)を選択する。因みに、本実施形態の場合には、2階の階高が大きく、よって他の階層よりも変形能が高い等の理由から、1、2階に上述する制震装置を増設する。
FIGS. 1-5 is for demonstrating one Embodiment of the seismic retrofit method of the existing building which concerns on this invention, FIG. 5 is a longitudinal cross-section which shows the structure of the existing building 1 before constructing the said seismic retrofit FIG. The plan view of the second floor before the repair is the same as that of the floor shown in FIG. 3, for example.
When such an existing building 1 is subjected to seismic retrofitting to add seismic control devices, first, a plurality of hierarchies that can be deformed in the existing building 1 (however, no more than 1/3 of the total number of hierarchies) Select. Incidentally, in the case of the present embodiment, the above-described seismic control devices are added to the first and second floors because the floor height of the second floor is large and hence the deformability is higher than other floors.
次いで、上記1、2階間の梁2aを撤去することにより、地震時に1、2階間の架構に所望の変形量が生じるようにする。そして、図1〜図4に示すように、梁2が撤去された後の1、2階の柱3および梁2によって構成される架構の構面内に、制震装置4を取り付ける。   Next, by removing the beam 2a between the first and second floors, a desired amount of deformation is generated in the frame between the first and second floors during an earthquake. Then, as shown in FIGS. 1 to 4, the vibration control device 4 is attached in the frame of the frame constituted by the first and second floor columns 3 and the beams 2 after the beams 2 are removed.
この制震装置4は、図4に示すように、柱3および梁2に添う矩形状の形成された枠体5と、この枠体5の中央部に一体に水平に架け渡された横架部材6と、この横架部材6の上下に配されたV字状のブレース7と、各々のブレース7に設けられたダンパー(制震部材)8とから構成されたものであり、枠体5は、それぞれアンカーボルトを介して、柱3および梁2に固定されている。   As shown in FIG. 4, the vibration control device 4 includes a rectangular frame 5 that follows the pillar 3 and the beam 2, and a horizontal frame that is integrally and horizontally stretched around the center of the frame 5. The frame 6 is composed of a member 6, V-shaped braces 7 arranged above and below the horizontal member 6, and dampers (damping members) 8 provided on each brace 7. Are fixed to the column 3 and the beam 2 via anchor bolts, respectively.
また、V字状のブレース7は、枠体5の水平方向の2箇所の角隅部から横架部材6の中央部へと延出するように形成されており、その中央部7aは、横架部材6に対して水平方向へ移動自在に設けられている。そして、この中央部7aの横架部材6との対向面には、滑り材が設けられている。   Further, the V-shaped brace 7 is formed so as to extend from two corners in the horizontal direction of the frame 5 to the center of the horizontal member 6, and the center 7 a It is provided so as to be movable in the horizontal direction with respect to the frame member 6. A sliding material is provided on the surface of the central portion 7a facing the horizontal member 6.
さらに、上記中央部7aと横架部材6との間には、地震時に発生するブレース7の中央部7aと横架部材6との間の水平方向への相対変位による振動エネルギーを吸収する上記ダンパー8が設けられている。
そして、これら制震装置4の取付が終了することにより、既存建物1の1、2階に、多数の制震装置4を集中的に配置した制震改修工事が完了する。
Further, between the central portion 7a and the horizontal member 6, the damper that absorbs vibration energy due to the relative displacement in the horizontal direction between the central portion 7a of the brace 7 and the horizontal member 6 generated during an earthquake. 8 is provided.
And the installation of these damping devices 4 is complete | finished, and the damping control repair work which arranged many damping devices 4 intensively on the 1st and 2nd floors of the existing building 1 is completed.
上記構成からなる制震改修方法によれば、既存建物1の1、2階間の既存の梁2aを撤去して、地震時に所望の変形量が生じるようにするとともに、上記梁2を撤去した後の柱3および梁2からなる架構に制震装置4を集中的に配置しているので、地震時に1、2階に大きな変形が生じると、制震装置4のブレース7の中央部7aと横架部材6との間に水平方向の相対変位が生じる。そして、この変位に基づく振動エネルギーが、ダンパー8によって吸収されることにより制震効果が発揮される。   According to the seismic retrofit method comprising the above configuration, the existing beam 2a between the first and second floors of the existing building 1 is removed so that a desired amount of deformation is generated during the earthquake, and the beam 2 is removed. Since the seismic control device 4 is centrally arranged on the frame composed of the post 3 and the beam 2, if a large deformation occurs on the first or second floor during the earthquake, the central portion 7a of the brace 7 of the seismic control device 4 and A horizontal relative displacement occurs between the horizontal member 6 and the horizontal member 6. And the vibration energy based on this displacement is absorbed by the damper 8, and the damping effect is exhibited.
この際に、特に地震時に大きな変形が生じる1、2階に、上記制震装置4を集中配置しているので、極めて効果的な制震機能を発揮させることができる。   At this time, since the vibration control device 4 is centrally arranged on the first and second floors where a large deformation occurs particularly during an earthquake, a very effective vibration control function can be exhibited.
また、この制震改修方法にあっては、1、2階に対してのみ、梁2の撤去や制震装置4の取付作業を行えば良く、例えば図3に示すように、他の階層は何等手を加える必要がないために施工範囲が狭くなり、よって既存建物1の他の階層における日常業務に大きな支障を与えることない。加えて、施工範囲が狭くて済む結果、耐震改修費用の低減化も図ることができる。   Moreover, in this seismic retrofit method, it is only necessary to remove the beam 2 and attach the seismic control device 4 to the first and second floors. For example, as shown in FIG. Since it is not necessary to make any changes, the construction range is narrowed, so that the daily work at the other levels of the existing building 1 is not greatly hindered. In addition, as a result of the narrow construction range, it is possible to reduce the cost of seismic retrofit.
さらに、制震装置4として、既存建物1の垂直荷重を支承可能であるとともに水平方向に変位可能なブレース7と、このブレース7の水平方向の振動エネルギーを吸収するダンパー8とを備えたものを用いているので、地震時に架構が変形した際に、ブレース7の水平方向の振動エネルギーをダンパー8で吸収することにより、制震効果を発揮することができるとともに、万一大きな変形が生じて、既存の柱3による軸力支承を失った場合においても、図4中に矢印で示すように建物の軸力をブレース7を介して支承する、いわゆるフェイルセーフ機能を発揮することができる。この結果、大地震時においても、上記既存建物1の崩壊を防ぐことができる。   Further, as the vibration control device 4, a device including a brace 7 that can support the vertical load of the existing building 1 and can be displaced in the horizontal direction, and a damper 8 that absorbs vibration energy in the horizontal direction of the brace 7. Because it is used, when the frame is deformed at the time of earthquake, the damper 8 can absorb the vibration energy in the horizontal direction of the brace 7 and can exert a vibration control effect. Even when the axial force support by the existing pillar 3 is lost, a so-called fail-safe function of supporting the building's axial force via the brace 7 as shown by the arrow in FIG. 4 can be exhibited. As a result, the existing building 1 can be prevented from collapsing even during a large earthquake.
なお、上記実施の形態においては、制震装置4を配置する1、2階の架構について、その地震時の変形量を増加させるべく、梁2aを撤去した場合についてのみ説明したが、これに限定されるものではなく、既存建物の構造上、変形を許容できる複数の階層が1、2階ではない場合には、他の複数の階層に対して、同様に既存の架構部材を撤去した上で制震装置4を増設するようにしてもよい。 In the above embodiment, only the case where the beam 2a is removed to increase the deformation amount of the first and second floor frames where the vibration control device 4 is arranged has been described. However, the present invention is not limited to this. However, if the number of floors that can be deformed is not 1 or 2 due to the structure of the existing building, the existing frame members must be removed from the other floors in the same way. You may make it add the damping device 4. FIG.
また、上記実施の形態においては、既存建物の2階の階高が大きいことから、制震装置4として、横架部材6を備えたものを用いたが、これに限るものではなく、階高等が他の階層と変わりがない場合等、当該横架部材6が不要な場合には、上下部のブレース7の中央部7a間に直接ダンパー8を取り付けることもできる。さらに、上下部のブレース7のうちの一方のみを用いて、当該一のブレース7の中央部7aと枠体5との間にダンパー8を取り付けるようにしても良い。   Moreover, in the said embodiment, since the floor height of the 2nd floor of the existing building was large, although the thing provided with the horizontal member 6 was used as the damping device 4, it is not restricted to this, Floor height etc. When the horizontal member 6 is not required, such as when there is no difference from other levels, the damper 8 can be directly attached between the central portions 7a of the upper and lower braces 7. Furthermore, you may make it attach the damper 8 between the center part 7a and the frame 5 of the said one brace 7 using only one of the braces 7 of the upper and lower parts.
本発明の一実施形態を施工した後の建物の構造を示す縦断面図である。It is a longitudinal cross-sectional view which shows the structure of the building after constructing one Embodiment of this invention. 図1のII−II線視断面図である。It is the II-II sectional view taken on the line of FIG. 図1のIII−III線視断面図である。It is the III-III sectional view taken on the line of FIG. 図1の制震装置の取付構造を示す部分拡大図である。It is the elements on larger scale which show the attachment structure of the damping device of FIG. 本発明の一実施形態を施工する前の既存建物の構造を示す縦断面図である。It is a longitudinal cross-sectional view which shows the structure of the existing building before constructing one Embodiment of this invention.
符号の説明Explanation of symbols
1 既存建物
2 梁
3 柱
4 制震装置
7 ブレース
8 ダンパー(制震部材)
DESCRIPTION OF SYMBOLS 1 Existing building 2 Beam 3 Column 4 Damping device 7 Brace 8 Damper (damping member)

Claims (2)

  1. 既存建物の全層数の1/3以下の階層に対して、当該階層の架構を構成する既存の梁を撤去することにより当該架構の地震時の変形量増加するようにし、次いで上記梁が撤去された後の複数の階層の柱および梁によって構成される架構の構面内に、当該複数の階層にわたる制震装置を集中的に配置することを特徴とする既存建物の制震改修方法。 The total number of layers of 1/3 or less of the hierarchy of existing buildings, as the deformation amount at the time of an earthquake of the Frame is increased by removing the existing beams constituting the Frame of the hierarchy, and then is the beam A seismic retrofitting method for an existing building, characterized in that seismic control devices extending over a plurality of floors are intensively arranged in a frame of a frame composed of columns and beams of a plurality of floors after being removed .
  2. 上記制震装置は、上記既存建物の垂直荷重を支承可能であるとともに水平方向に変位可能なブレースと、上記ブレースの水平方向の振動エネルギーを吸収する制震部材とを備えてなることを特徴とする請求項1に記載の既存建物の制震改修方法。   The vibration control device includes a brace capable of supporting the vertical load of the existing building and being horizontally displaceable, and a vibration control member that absorbs vibration energy in the horizontal direction of the brace. The seismic retrofit method for an existing building according to claim 1.
JP2003377031A 2003-11-06 2003-11-06 Seismic retrofit method for existing buildings Expired - Fee Related JP3972892B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010261240A (en) * 2009-05-08 2010-11-18 Shimizu Corp Vibration control renovation construction method of existing multistory building

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6237847B1 (en) * 2016-08-31 2017-11-29 積水ハウス株式会社 Vibration control reform method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010261240A (en) * 2009-05-08 2010-11-18 Shimizu Corp Vibration control renovation construction method of existing multistory building

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