JP4286574B2

JP4286574B2 - Suspension control structure

Info

Publication number: JP4286574B2
Application number: JP2003105390A
Authority: JP
Inventors: 英二藤井; 信哉五十嵐
Original assignee: Takenaka Corp
Current assignee: Takenaka Corp
Priority date: 2003-04-09
Filing date: 2003-04-09
Publication date: 2009-07-01
Anticipated expiration: 2023-04-09
Also published as: JP2004308314A

Description

【０００１】
【発明の属する技術分野】
この発明は、制震構造物の全体を、複数本の吊り材を一組として構成した吊り手段を複数個使用して主構造物から下方へ吊り下げて支持する構成により、中・小規模の水平力には耐震機能を発揮し、大規模な水平力には構造物の固有振動を長周期化する制震機能に切り替わる吊り制震構造の技術分野に属する。
【０００２】
【従来の技術】
吊り制震構造は、振り子の原理を利用した制震構造であって、構造物の固有振動を長周期化することができる技術として知られている。
【０００３】
しかし、構造物の固有振動を長周期化すると云うことは、同時に当該制震構造が低剛性であることを意味し、中小の地震や風、環境振動等の中、小規模の外乱に対して構造物の水平変位が大きくなる。そのため、通例は構造物と主構造物との間に水平付加バネやダンパー等を設け、中、小規模な外乱に対して耐震機能を発揮する構成とされている。
【０００４】
ところが、（ｉ）水平付加バネやダンパー等を設置する余分なスペースや費用が必要である。（ii）大規模な外乱に対しても水平付加バネやダンパー等の剛性や減衰力が発揮され、吊り制震構造の本来の目的である固有振動の長周期化を妨げる虞がある。などの問題点が生じる。
【０００５】
そこで、本出願人らは上記（ｉ）、（ii）の問題点を解決するべく、以下の技術を開発し特許出願をするに至った。
（Ｉ）主構造物に、下部吊り点の幅よりも上部吊り点の幅が広いＶ字状に配置した２本を一組とする複数の吊り材で制震構造物を吊り下げ支持した。具体的には、前記吊り材は一例として抗圧縮性部材で構成され、制震構造物の水平変位に対して、引っ張り側の吊り材によって復元力が働き、同時に圧縮側となる吊り材の抵抗によって自己減衰力が働く構成とし、制震構造物が中小規模な外乱に対して大きく変位しない構成とした（特許文献１）。
【０００６】
【特許文献１】
特開平１１−２７０１７６号公報
【０００７】
【本発明が解決しようとする課題】
上記（Ｉ）の従来技術は、水平付加バネやダンパー等を設けないでも、中、小規模の外乱に対して耐震機能を発揮する点を注目できる。しかし、制震構造物の水平変位に対して圧縮側の吊り材が抵抗する構成であるため、大規模な外乱に対しても抵抗し、吊り制震構造の本来の目的である固有振動の長周期化を妨げる虞があり、上記（ii）の問題点を解決するに至っていない。
【０００８】
即ち、中、小規模な外乱に対して耐震機能を発揮し、大規模な外乱に対して制震機能を発揮する吊り制震構造は見聞することができない。
【０００９】
したがって、本発明の目的は、水平付加バネやダンパー等を設けないでも、中、小規模の外乱に対して所謂トリガー機構によって耐震機能を発揮し、また、大規模な外乱に対しては制震機能を発揮することができる吊り制震構造を提供することである。
【００１０】
【課題を解決するための手段】
上記従来技術の課題を解決するための手段として、請求項１に記載した発明に係る吊り制震構造は、
吊り制震構造において、
制震構造物１は、その全体が複数個の吊り手段２によって主構造物３から下方へ吊り下げて略水平に支持されており、
前記複数個の吊り手段２、２はそれぞれ、複数本の吊り材４、４’を一組として構成され、一組をなす吊り材４、４’同士は、その上部吊り点４ａ、４ａ’の間隔が下部吊り点４ｂ、４ｂ’の間隔より広いＶ字形状に、又は下部吊り点の間隔が上部吊り点の間隔より広い逆Ｖ字形状に配置されており、
前記吊り材４、４’は非抗圧縮性部材で構成され、上記制震構造物１を主構造物３から吊り下げた静止状態において前記吊り手段２を構成する一組をなす複数本の吊り材４、４’はそれぞれ弾性限度内の伸びを生じて釣り合い状態を保ち、
制震構造物１が、吊り手段２を構成する全ての吊り材４、４’に引っ張り力が残存する範囲内の水平力を受けている場合は、軸剛性を保持して耐震機能を発揮し、
同制震構造物１が、吊り手段２において水平力の作用方向前側に位置する吊り材４又は４’の引張り力が消滅して弛む以上の水平力を受けた場合は、引っ張り力が残存する他の吊り材のみで吊られて水平剛性が小さくなり、固有振動が長周期化した制震機能を発揮することを特徴とする。
【００１１】
請求項２に記載した発明に係る吊り制震構造は、
吊り制震構造において、
制震構造物１は、その全体が複数個の吊り手段２、２によって主構造物３から下方へ吊り下げて略水平に支持されており、
前記複数個の吊り手段２、２はそれぞれ、複数本の吊り材４、４’を一組として構成され、一組をなす吊り材４、４’同士は、その上部吊り点４ａ、４ａ’の間隔が下部吊り点４ｂ、４ｂ’の間隔より広いＶ字形状に、又は下部吊り点の間隔が上部吊り点の間隔より広い逆Ｖ字形状に配置されており、
前記各吊り材４、４’の上部又は下部の吊り点４ａ、４ａ’又は４ｂ、４ｂ’は吊り材４、４’が略軸線方向に逃げる移動が可能な構成とされており、
前記吊り材４、４’は抗圧縮性部材で構成され、上記制震構造物１を主構造物３から吊り下げた静止状態において前記吊り手段２を構成する一組をなす複数本の吊り材４、４’はそれぞれ弾性限度内の伸びを生じて釣り合い状態を保ち、
制震構造物１が、吊り手段２を構成する全ての吊り材４、４’に引っ張り力が残存する範囲内の水平力を受けている場合は、軸剛性を保持して耐震機能を発揮し、
同制震構造物１が、吊り手段２において水平力の作用方向前側に位置する吊り材４又は４’の引張り力が消滅する以上の水平力を受けた場合は、引っ張り力が残存する他の吊り材のみで吊られて水平剛性が小さくなり、固有振動が長周期化した制震機能を発揮することを特徴とする。
【００１２】
請求項３に記載した発明は、請求項１又は２に記載した吊り制震構造において、
吊り手段２，２を構成する一組をなす複数本の吊り材４，４’は多角錐形状に配置されていることを特徴とする。
【００１３】
請求項４に記載した発明は、請求項２又は３に記載した吊り制震構造において、
吊り手段２，２を構成する各吊り材４，４’の上部は主構造物３を貫通させ、又は同吊り材４，４’の下部は制震構造物１を貫通させ、各々の端部に設けられた係止部４ｃによって主構造物３又は制震構造物１へ軸線方向に逃げる移動が可能に係止されていること、
前記係止部４ｃと主構造物３又は制震構造物１との間に、弾性体及びダンパー等によるエネルギー吸収機構８が設けられていることを特徴とする。
【００１４】
【本発明の実施形態、及び実施例】
以下に、請求項１〜４に記載した発明に係る吊り制震構造の実施形態を、図１〜図８に基づいて説明する。
【００１５】
図１（Ａ）〜（Ｃ）は、請求項１に記載した発明に係る吊り制震構造の動作を概略的に示している。
図１の吊り制震構造は、（Ａ）に示すように、制震構造物１の全体が２組の吊り手段２、２によって主構造物３から下方へ略水平に吊り下げ支持されている。前記吊り手段２は、それぞれ２本の吊り材４、４’を一組として構成され、その上端部は主構造物３に間隔を開けて設けられた連結用ブラケット５ａ、５ａ’へそれぞれ連結されている。吊り材４、４’の下端部は、制震構造物１に設けられた連結用ブラケット５ｂを共通に使用して連結されている。その結果、吊り材４と４’の上部吊り点４ａと４ａ’の間隔は、下部吊り点４ｂ（４ｂ’）の間隔より広いＶ字形状に配置されている。
【００１６】
前記吊り材４、４’はワイヤー等の非抗圧縮性部材で構成されている。上記のように制震構造物１を吊り下げ支持すると、当該吊り材４、４’は前記制震構造物１を略水平に吊り下げた静止状態において、弾性限度内で伸び釣り合い状態を保つ。本発明の吊り制震構造は、前記弾性限度内の伸びを積極的に生じさせ、中、小規模の外乱に対して耐震機能を発揮させ、また、大規模な外乱に対しては制震機能を発揮する構成としている。
【００１７】
図２は、本発明の吊り制震構造の原理図を示している。本発明の吊り制震構造は振り子の原理に基づいていることを、以下に説明する。
図２の「状態Ａ」は、制震構造物１と見立てたおもり６を吊り材４、４’に吊り下げる前の状態を示している。「状態Ｂ」はおもり６を吊り下げた後の状態を示している。おもり６が吊り下げられた２本の吊り材４、４’にそれぞれ、引張力Ｔ_１、Ｔ_２が生じ、弾性限度内の変位λだけ鉛直下方に伸びる。このとき吊り材４と４’には、引張力Ｔ_１とＴ_２がそれぞれ生じている。すなわち、軸剛性を保持した状態であり、２本の吊り材４と４’の軸剛性が系全体の水平剛性に寄与している。
【００１８】
「状態Ｂ」のおもり６に、中、小規模の外乱に相当する比較的小さな水平力Ｐが加わると、水平力Ｐの作用方向前側（図２では右側）の吊り材４は弛み側となって引張力Ｔ_１は減少し、伸びは収束に向かう。前記引張力Ｔ_１は減少しながらも、吊り材４に生じているので、吊り材４’はもとより吊り材４の軸剛性も保持されたままである。従って、両方の吊り材４と４’の軸剛性が系全体の水平剛性に寄与している。
【００１９】
前記水平力Ｐの作用方向前側の吊り材４の引張力Ｔ_１は、水平力Ｐが大きくなるにつれて消滅し、伸びは収束する。すなわち、上記の状態は水平力Ｐが、吊り材４の引張力Ｔ_１が消滅し伸びが収束する大きさの水平力Ｐ_１（そのときの水平変位ｕ_１、図３を参照）と等しくなるまで続く。したがって、吊り材４の引張力Ｔ_１が消滅するまでの比較的小さな水平力Ｐに対しては、両方の吊り材４と４’の軸剛性が系全体の水平剛性に寄与するので、おもり６の水平変位ｕは抑制される。つまり、吊り制震構造では耐震機能を発揮することを意味する。上記の状態は図２の「状態Ｃ」として示し、吊り材４の引張力Ｔ_１が消滅し伸びが収束した状態を図２の「状態Ｄ」として示している。
【００２０】
一方、「状態Ｂ」のおもり６に、大規模な外乱を想定して上記水平力Ｐ_１よりも大きな水平力Ｐを加えると、おもり６は一気に「状態Ｄ」となり、水平力Ｐの作用方向前側の吊り材４の引張力Ｔ_１が消滅し伸びが収束する。その後、前記吊り材４は弛みを生じ、おもり６は他方側の吊り材４’のみで吊られ、いわゆる振り子状態となる。即ち、系全体の水平剛性が小さくなるので固有振動が長周期化する。つまり、吊り制震構造では制震機能を発揮することを意味する。上記の状態は図２の「状態Ｅ」として示している。
【００２１】
図３は、上記状態Ａ〜Ｅまでの水平力Ｐと水平変位ｕとの関係を示している。図３に示すように、水平力Ｐが「状態Ｄ」での水平力Ｐ_１より小さい場合、又は水平変位ｕが「状態Ｄ」での水平変位ｕ_１より小さい場合は所謂トリガー機構によって耐震機能を発揮し、水平力ＰがＰ_１より大きい場合、又は水平変位ｕがｕ_１より大きい場合は制震機能を発揮することが確認できる。
【００２２】
以上より、本発明の吊り制震構造は、水平力Ｐが図３中の水平力Ｐ _１よりも小さい場合、言い換えると水平変位ｕが図３中の水平変位ｕ _１よりも小さい場合にはダンパー等を設けなくても、中小地震や風、環境振動等の中、小規模の外乱に対しては、所謂トリガー機能によって耐震機能を発揮し、制震建物としては、振動の少ない良好な居住環境を維持できる（図１（Ｂ）を参照）。一方、水平力Ｐが図３中の水平力Ｐ _１よりも大きい場合、言い換えると水平変位ｕが図３中の水平変位ｕ _１よりも大きい大規模な外乱に対しては、自動的に耐震構造から制震構造に切り替わり、制震機能を発揮できる（図１（Ｃ）を参照）。
【００２３】
また、吊り材４の材質、長さ、断面寸法、Ｖ字（逆Ｖ字）の角度などを適宜選択し、「状態Ｂ」での鉛直変位λを変えることによって、簡単に耐震構造から制震構造に切り替わる水平力Ｐ_１又は水平変位ｕ_１の大きさを設定することができ、構造物に応じた特性を創り出すことができる。
【００２４】
図４及び図５は、図１に示した吊り制震構造の異なる実施形態を示している。図１に示した吊り制震構造の一組の吊り材４、４’はＶ字形状に配置しているが、図４に示すように、逆ハ字形状に配置しても略同様に実施できる。また、図５に示すように、下部吊り点４ｂ、４ｂ’の幅が上部吊り点４ａ、４ａ’の幅より広い逆Ｖ字形状に配置しても略同様に実施できる。
【００２５】
図６は、図１に示した吊り制震構造の更に異なる実施形態を示している。
図６に示す吊り制震構造は、図１に示した吊り制震構造と略同様に、制震構造物１が２組の吊り手段２、２によって主構造物３から略水平に吊り支持されている。前記吊り手段２は２本の吊り材４、４’を一組として構成され、上部吊り点４ａ、４ａ’の間隔が下部吊り点４ｂ、４ｂ’の間隔より広いＶ字形状に配置されている。そして、上記制震構造物１を略水平に吊り下げた状態において前記吊り材４、４’が弾性限度内で伸びて釣り合い状態を保つ。
【００２６】
但し、図６の吊り材４、４’は抗圧縮性部材で構成され、上記一組の吊り材４、４’それぞれの上部吊り点４ａ、４ａ’は略軸線方向に逃げる移動が可能な構成とされている（請求項２記載の発明）。具体的には、前記吊り材４、４’それぞれの上端部に係止部４ｃが設けられている。主構造物３には、前記係止部４ｃが略上下方向に移動できる縦孔７が形成され、前記縦孔７の下端部に係止部４ｃの引っ掛け片３ａが形成されている。すなわち、吊り材４、４’それぞれの係止部４ｃは、主構造物３の引っ掛け片３ａに引っ掛けられ主構造物３の縦孔７内を略上下方向に移動可能な構成とされている。
【００２７】
上記吊り制震構造も、制震構造物１に加わる水平力が、同水平力の作用方向前側の吊り材４の引張り力が消滅する大きさの水平力（図３中のＰ _１）より小さい場合は、図１に示した吊り制震構造と同様に耐震機能の動きをする。一方、前記水平力が、吊り材４の引張り力が消滅する大きさの水平力より大きい場合は、水平力の作用方向前側に位置する吊り材４の係止部４ｃが縦孔７の側面に沿って迫り上がって逃げ、吊り材４は水平力に対して抵抗しないから系全体の水平剛性が小さくなり固有振動が長周期化し制震機能を発揮する。かくして、図１に示した吊り制震構造と同様に、ダンパー等を設けなくても、中小地震、風、環境振動等の中、小規模な外乱に対しては耐震機能を発揮し、制震建物として振動の少ない良好な居住環境を維持できる。一方、大規模な外乱に対しては、自動的に耐震構造から制震構造に切り替わり、制震機能を発揮できる。
【００２８】
また、吊り材４、４’の材質、長さ、断面寸法、Ｖ字（逆Ｖ字）の角度などを適宜選択し、静止状態での鉛直変位を変えることによって、簡単に耐震構造から制震構造に切り替わる水平力又は水平変位の大きさを設定することができ、構造物に応じた特性を創り出すことができる。
【００２９】
図７は、図６に示した上部吊り点の構造と異なる構造を示している。
図７に示す吊り材４、４’の上部は主構造物３の貫通孔３ｂへ通され、その端部に設けられた係止部４ｃによって主構造物３に係止されている。そして、前記係止部４ｃと主構造物３との間にバネ等の弾性体及びダンパー等のエネルギー吸収機構８（以下、エネルギー吸収機構等８と省略する。）が設けられている（請求項４記載の発明）。制震構造物１が復元する際に前記エネルギー吸収機構等８が減衰力を発揮するので、制震構造物１の固有振動を好適に収束させることができる。
【００３０】
なお、図６及び図７に示した吊り材４、４’はＶ字形状に配置されているが、この限りでない。前記吊り材４、４’は逆Ｖ字形状に配置されても良く、下部吊り点４ｂ、４ｂ’は制震構造物１を貫通させ、その端部に設けられた係止部によって制震構造物１に係止される（請求項２及び４記載の発明）。
【００３１】
図８（Ａ）〜（Ｃ）は、吊り手段２を構成する一組の複数本の吊り材４…の異なる配置の態様を示している。図８（Ａ）は３本の吊り材４‥が三角錐形状に配置されている。図８（Ｂ）は４本の吊り材４…が四角錐形状に配置されている。図８（Ｃ）は６本の吊り材４…が六角錐形状に配置されている。吊り手段２を構成する一組の複数本の吊り材４を立体的に配置することで、図８のＸ方向だけでなく、Ｙ方向への水平力に対しても耐震、制震機能を発揮することができる。
【００３２】
なお、図１及び図４から図６に示した吊り制震構造は、制震構造物と主構造物との間にエネルギー吸収機構等が設けられていないが、エネルギー吸収機能を上げるためにエネルギー吸収機構等が設けられても良い。
【００３３】
【本発明の奏する効果】
請求項１〜４に記載した発明に係る吊り制震構造は、ダンパー等を設けなくても、中小地震や風、環境振動等の中、小規模の外乱に対しては、所謂トリガー機構によって耐震機能を発揮し、制震建物として構成すると、振動の少ない良好な居住環境を維持できる。また、大規模な外乱に対しては、自動的に耐震構造から制震構造に切り替わり、制震機能を発揮できる。
【００３４】
また、吊り材の材質、長さ、断面寸法、Ｖ字（逆Ｖ字）の角度などを適宜選択し、静止状態での前記吊り材の伸びを変えることによって、簡単に耐震構造から制震構造に切り替わる水平力又は水平変位の大きさを設定することができ、構造物に応じた特性を創り出すことができる。
【図面の簡単な説明】
【図１】（Ａ）〜（Ｃ）は、本発明の吊り制震構造の実施形態を概念的に示した立面図である。
【図２】本発明の吊り制震構造の原理図を示している。
【図３】図２の水平力と水平変位との関係を示した図である。
【図４】本発明の吊り制震構造の異なる実施形態を示した立面図である。
【図５】本発明の吊り制震構造の更に異なる実施形態を示した立面図である。
【図６】本発明の吊り制震構造の更に異なる実施形態を示した立面図である。
【図７】図６の吊り材の上部吊り点の異なる構成を示した図である。
【図８】（Ａ）〜（Ｃ）は、吊り材の配置例を示した図である。
【符号の説明】
３主構造物
２吊り手段
１制振構造物
４、４吊り材
４ａ、４ａ’上部吊り点
４ｂ、４ｂ’下部吊り点
７縦孔
８エネルギー吸収機構[0001]
BACKGROUND OF THE INVENTION
According to the present invention, the entire structure of the damping structure is supported by being suspended downward from the main structure by using a plurality of suspension means constituted by a plurality of suspension members. It belongs to the technical field of suspension seismic control structure that exhibits seismic function for horizontal force and switches to seismic control function that makes the natural vibration of the structure longer for large horizontal force.
[0002]
[Prior art]
The suspended vibration control structure is a vibration control structure that uses the principle of a pendulum, and is known as a technique that can lengthen the natural vibration of a structure.
[0003]
However, the longer period of the natural vibration of the structure means that the damping structure is also less rigid, and it is suitable for medium and small-scale disturbances such as small and medium earthquakes, winds, and environmental vibrations. The horizontal displacement of the structure increases. For this reason, a horizontal additional spring, a damper, or the like is usually provided between the structure and the main structure so as to exhibit a seismic function against medium and small-scale disturbances.
[0004]
However, (i) extra space and cost for installing a horizontal additional spring, a damper and the like are necessary. (Ii) The rigidity and damping force of the horizontal additional springs and dampers are exerted even for large-scale disturbances, and there is a possibility that the natural vibration, which is the original purpose of the suspension vibration control structure, is prevented from becoming longer. This causes problems.
[0005]
Accordingly, the present applicants have developed the following technique and filed a patent application in order to solve the problems (i) and (ii).
(I) The vibration control structure was suspended and supported on the main structure by a plurality of suspension members, each of which is a V-shaped arrangement in which the upper suspension point is wider than the lower suspension point. Specifically, the suspension material is formed of an anti-compressible member as an example, and a restoring force is exerted by the suspension material on the pull side against the horizontal displacement of the vibration control structure, and at the same time, the resistance of the suspension material on the compression side. Therefore, the damping structure is configured not to be greatly displaced with respect to small- and medium-scale disturbances (Patent Document 1).
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-270176
[Problems to be solved by the present invention]
It can be noted that the conventional technique (I) exhibits a seismic function against medium and small-scale disturbances without providing a horizontal additional spring or a damper. However, since the suspension material on the compression side resists horizontal displacement of the vibration control structure, it resists large-scale disturbances, and the length of the natural vibration that is the original purpose of the suspension vibration control structure. There is a possibility that periodicity may be hindered, and the problem (ii) has not been solved.
[0008]
In other words, it is impossible to observe a suspended seismic control structure that exhibits a seismic function for medium and small-scale disturbances and a seismic control function for large-scale disturbances.
[0009]
Therefore, the object of the present invention is to provide a seismic function with a so-called trigger mechanism for medium and small-scale disturbances without providing a horizontal additional spring or a damper, and to control vibrations for large-scale disturbances. The objective is to provide a suspension control system that can perform its functions.
[0010]
[Means for Solving the Problems]
As means for solving the problems of the prior art, the suspension vibration control structure according to the invention described in claim 1 is:
In suspension vibration control structure,
Damping structure 1 is supported substantially horizontally hung in its entirety by a plurality of hanging means 2 from the main structure 3 downward,
Each of the plurality of suspension means 2 and 2 is configured as a set of a plurality of suspension members 4 and 4 ′, and the suspension members 4 and 4 ′ forming a set are connected to the upper suspension points 4 a and 4 a ′. The interval is arranged in a V shape wider than the interval between the lower suspension points 4b and 4b ', or the inverted V shape where the interval between the lower suspension points is wider than the interval between the upper suspension points,
The suspension members 4, 4 ′ are made of a non-compressible member, and a plurality of suspension members forming a set constituting the suspension means 2 in a stationary state where the vibration control structure 1 is suspended from the main structure 3. Each of the materials 4, 4 'produces an elongation within the elastic limit and maintains a balanced state,
When the seismic control structure 1 receives a horizontal force within the range in which the tensile force remains on all the suspension members 4, 4 ′ constituting the suspension means 2, the shaft rigidity is maintained and the earthquake resistance function is exhibited. ,
When the seismic control structure 1 receives a horizontal force that exceeds the slackness of the suspension member 4 or 4 ′ located on the front side of the horizontal force acting direction in the suspension means 2, the tensile force remains. It is characterized by having a seismic control function that is hung only by other hoisting materials and has a low horizontal rigidity and a long period of natural vibration.
[0011]
The suspension vibration control structure according to the invention described in claim 2 is:
In suspension vibration control structure,
Damping structure 1 is supported substantially horizontally hung in its entirety by a plurality of hanging means 2, 2 from the main structure 3 downward,
Each of the plurality of suspension means 2 and 2 is configured as a set of a plurality of suspension members 4 and 4 ′, and the suspension members 4 and 4 ′ forming a set are connected to the upper suspension points 4 a and 4 a ′. The interval is arranged in a V shape wider than the interval between the lower suspension points 4b and 4b ', or the inverted V shape where the interval between the lower suspension points is wider than the interval between the upper suspension points,
The upper and lower suspension points 4a, 4a 'or 4b, 4b' of the suspension members 4, 4 'are configured such that the suspension members 4, 4' can move in a substantially axial direction.
The suspension members 4, 4 ′ are made of an anti-compressible member, and a plurality of suspension members forming a set constituting the suspension means 2 in a stationary state in which the damping structure 1 is suspended from the main structure 3. 4 and 4 'are each stretched within the elastic limit and kept in balance,
When the seismic control structure 1 receives a horizontal force within the range in which the tensile force remains on all the suspension members 4, 4 ′ constituting the suspension means 2, the shaft rigidity is maintained and the earthquake resistance function is exhibited. ,
When the damping structure 1 receives a horizontal force that exceeds the tensile force of the suspension member 4 or 4 ′ located on the front side of the horizontal force acting direction in the suspension means 2, other tensile force remains. It is characterized by a seismic control function that is hung only by a suspension material and has a low horizontal rigidity and a long period of natural vibration.
[0012]
The invention described in claim 3 is the suspension vibration control structure described in claim 1 or 2,
A plurality of suspension members 4 and 4 ′ constituting a set constituting the suspension means 2 and 2 are arranged in a polygonal pyramid shape.
[0013]
The invention described in claim 4 is the suspension vibration control structure according to claim 2 or 3,
Hanging the hanging members 4,4 which constitute the means 2,2 'top of passed through the main structure 3, or the hanging members 4,4' bottom of passed through a vibration control structure 1, each of the ends Is locked to the main structure 3 or the damping structure 1 so as to be able to move in the axial direction by the locking portion 4c provided in
Between the locking portion 4c and the main structure 3 or seismic damping structure 1, characterized in that the energy-absorbing mechanism 8 by the elastic member and the damper or the like are provided.
[0014]
[Embodiments and Examples of the Present Invention]
Below, embodiment of the suspension damping structure which concerns on the invention described in Claims 1-4 is demonstrated based on FIGS.
[0015]
1 (A) to 1 (C) schematically show the operation of the suspension vibration control structure according to the invention described in claim 1.
Hanging Seismic structure of FIG. 1 is supported hanging (A), a substantially horizontally from the main structure 3 downward overall seismic damping structure 1 by two pairs of hanging means 2, 2 . The suspension means 2 is composed of two suspension members 4 and 4 'as a set, and the upper ends thereof are connected to connection brackets 5a and 5a' provided at intervals in the main structure 3, respectively. ing. The lower ends of the suspension members 4, 4 ′ are connected using a connection bracket 5 b provided on the vibration control structure 1 in common. As a result, the interval between the upper suspension points 4a and 4a 'of the suspension members 4 and 4' is arranged in a V shape wider than the interval between the lower suspension points 4b (4b ').
[0016]
The suspension members 4, 4 ′ are made of a non-compressible member such as a wire. When the vibration control structure 1 is suspended and supported as described above, the suspension members 4 and 4 ′ are stretched and kept within an elastic limit in a stationary state in which the vibration control structure 1 is suspended substantially horizontally. The suspended vibration control structure of the present invention positively generates elongation within the elastic limit, exerts a seismic function for medium and small-scale disturbances, and provides a vibration control function for large-scale disturbances. It is set as the structure which demonstrates.
[0017]
FIG. 2 shows a principle diagram of the suspended vibration control structure of the present invention. It will be described below that the suspended vibration control structure of the present invention is based on the principle of a pendulum.
“State A” in FIG. 2 shows a state before the weight 6 regarded as the vibration control structure 1 is suspended from the suspension members 4, 4 ′. “State B” indicates a state after the weight 6 is suspended. Tensile forces T ₁ and T ₂ are generated in the _two suspension members 4 and 4 ′ on which the weight 6 is suspended, respectively, and extend vertically downward by a displacement λ within the elastic limit. And 4 in the 'hanging member 4 this time, a tensile force T ₁ and T ₂ is generated respectively. That is, the shaft rigidity is maintained, and the shaft rigidity of the two suspension members 4 and 4 'contributes to the horizontal rigidity of the entire system.
[0018]
When a relatively small horizontal force P corresponding to a medium or small-scale disturbance is applied to the weight 6 of “state B”, the suspension material 4 on the front side (right side in FIG. 2) of the horizontal force P acts on the slack side. As a result, the tensile force T ₁ decreases and the elongation tends to converge. While the tensile force T ₁ decreases, since the occurring hanging member 4, the hanging member 4 'remains also retained the axial stiffness of the suspension member 4 as well. Therefore, the axial rigidity of both suspension members 4 and 4 'contributes to the horizontal rigidity of the entire system.
[0019]
Tension T ₁ of the said horizontal force acting direction front side of the hanging member 4 P is extinguished as the horizontal force P is large, the elongation is converged. That is, in the above state, the horizontal force P is equal to the horizontal force P ₁ (the horizontal displacement u _{1 at} that time, see FIG. 3) having such a magnitude that the tensile force T ₁ of the suspension member 4 disappears and the elongation converges. It continues until. Thus, for a relatively small horizontal force P to the tensile force T ₁ of the hanging member 4 is eliminated, since the axial rigidity of both the suspension member 4 and 4 'contributes to the horizontal rigidity of the entire system, weight 6 The horizontal displacement u is suppressed. In other words, it means that the seismic function is exhibited in the suspended seismic control structure. The above state is shown as "state C" in FIG. 2 shows a state in which tensile force T ₁ of the hanging member 4 has converged elongation disappears as the "state D" in FIG. 2.
[0020]
On the other hand, when a horizontal force P larger than the horizontal force P ₁ is applied to the weight 6 of the “state B” assuming a large-scale disturbance, the weight 6 immediately becomes the “state D”, and the acting direction of the horizontal force P tensile elongation force T ₁ of the front side of the hanging material 4 disappears converge. Thereafter, the hanger 4 is slackened , and the weight 6 is hung only by the hanger 4 'on the other side to be in a so-called pendulum state. That is, since the horizontal rigidity of the entire system is reduced, the natural vibration becomes longer. In other words, it means that the suspension damping structure exerts the damping function. The above state is shown as “state E” in FIG.
[0021]
FIG. 3 shows the relationship between the horizontal force P and the horizontal displacement u in the states A to E. As shown in FIG. 3, when the horizontal force P is smaller than the horizontal force P ₁ in the “state D”, or when the horizontal displacement u is smaller than the horizontal displacement u ₁ in the “state D”, the so-called trigger mechanism is used for the earthquake resistance function. When the horizontal force P is greater than P ₁ or when the horizontal displacement u is greater than u _1, it can be confirmed that the seismic control function is exhibited.
[0022]
As described above, the suspension vibration control structure of the present invention has a damper when the horizontal force P is smaller than the horizontal force P _{1 in} FIG. 3 , in other words, when the horizontal displacement u is smaller than the horizontal displacement u _{1 in} FIG. there is no need to provide and the like, small and medium-sized earthquake and wind, in the environment vibration, etc., for the small-scale disturbance, to demonstrate the seismic function by a so-called trigger function, as the vibration control building, vibration less favorable living environment Can be maintained (see FIG. 1B). On the other hand, if the horizontal force P is greater than the horizontal force P ₁ in FIG. 3, for the other words horizontal displacement u is large disturbance larger than the horizontal displacement u ₁ in FIG. 3, automatically seismic structure It can be switched to a seismic control structure to exhibit the seismic control function (see Fig. 1 (C)).
[0023]
In addition, the material, length, cross-sectional dimensions, V-shaped (reverse V-shaped) angle, etc. of the suspension material 4 are selected as appropriate, and the vertical displacement λ in “state B” is changed to easily control the vibration from the earthquake-resistant structure. The magnitude of the horizontal force P ₁ or the horizontal displacement u ₁ for switching to the structure can be set, and characteristics according to the structure can be created.
[0024]
4 and 5 show different embodiments of the suspension vibration control structure shown in FIG. A pair of suspension members 4, 4 'shown in Fig. 1 are arranged in a V shape, but they are implemented in the same way even if they are arranged in an inverted C shape as shown in Fig. 4. it can. Moreover, as shown in FIG. 5, even if it arrange | positions in the reverse V shape where the width | variety of lower suspension point 4b, 4b 'is wider than the width | variety of upper suspension point 4a, 4a', it can implement substantially similarly.
[0025]
FIG. 6 shows still another embodiment of the suspension vibration control structure shown in FIG.
In the suspension damping structure shown in FIG. 6, the damping structure 1 is suspended and supported substantially horizontally from the main structure 3 by two sets of suspension means 2 and 2 in the same manner as the suspension damping structure shown in FIG. ing. The hanging means 2 'is configured as a pair, upper suspension point 4a, 4a' hanging member 4, 4 of the two has the spacing is arranged in a wide V-shape than the distance of the lower suspension points 4b, 4b ' . And in the state which suspended the said damping structure 1 substantially horizontally, the said suspension materials 4 and 4 'extend within an elastic limit, and maintain a balanced state.
[0026]
However, hanging member 4,4 'of FIG. 6 is constituted by an anti-compressible members, the pair of hanging members 4,4' respectively of the upper hanging point 4a, 4a 'are capable of moving to escape generally axially configuration (Invention of claim 2). Specifically, a locking portion 4c is provided at the upper end of each of the suspension members 4, 4 ′. The main structure 3 is formed with a vertical hole 7 in which the locking portion 4 c can move in a substantially vertical direction, and a hook piece 3 a of the locking portion 4 c is formed at the lower end of the vertical hole 7. That is, the engaging portions 4 c of the suspension members 4 and 4 ′ are configured to be hooked on the hook pieces 3 a of the main structure 3 and move substantially vertically in the vertical holes 7 of the main structure 3.
[0027]
The suspended vibration control structure also, the horizontal force applied to the vibration control structure 1, the horizontal force having a magnitude tensile force of the suspension member 4 of the working direction the front of the same horizontal force disappears (P ₁ in FIG. 3) When it is small , the seismic function moves in the same manner as the suspension vibration control structure shown in FIG. On the other hand, when the horizontal force is larger than the horizontal force with which the tensile force of the suspension member 4 disappears, the engaging portion 4c of the suspension member 4 located on the front side of the horizontal force acting direction is on the side surface of the vertical hole 7. along escape What above approaching it, the hanging member 4 exhibits with natural vibration long period of horizontal stiffness do not resist the entire system is reduced with respect to the horizontal force seismic control function. Thus , as with the suspension vibration control structure shown in Fig. 1, even if a damper is not provided, it will exhibit an earthquake resistance function for small and medium disturbances such as small and medium earthquakes, winds, and environmental vibrations. less favorable living environment of vibration as a building can be maintained. On the other hand, for large-scale disturbances, the seismic structure can be automatically switched to a seismic structure, and the seismic control function can be demonstrated.
[0028]
In addition, the material of the suspension members 4, 4 ′, length, cross-sectional dimensions, V-shaped (reverse V-shaped) angle, etc. are selected as appropriate, and the vertical displacement in a stationary state is changed to easily control the vibration from the earthquake resistant structure. The magnitude of the horizontal force or horizontal displacement that switches to the structure can be set, and the characteristics corresponding to the structure can be created.
[0029]
FIG. 7 shows a structure different from the structure of the upper suspension point shown in FIG.
7 is passed through the through hole 3b of the main structure 3 and is locked to the main structure 3 by a locking portion 4c provided at the end thereof. An elastic body such as a spring and an energy absorbing mechanism 8 such as a damper (hereinafter abbreviated as “energy absorbing mechanism 8”) are provided between the locking portion 4c and the main structure 3 (claims). 4). When the damping structure 1 is restored, the energy absorbing mechanism 8 exhibits a damping force, so that the natural vibration of the damping structure 1 can be suitably converged.
[0030]
6 and 7 are arranged in a V shape, this is not restrictive. The suspension members 4, 4 'may be arranged in an inverted V shape, and the lower suspension points 4b, 4b' penetrate the vibration control structure 1, and the vibration control structure is provided by a locking portion provided at the end thereof. It is locked to the object 1 (the invention according to claims 2 and 4).
[0031]
FIGS. 8A to 8C show different arrangements of a set of a plurality of suspension members 4 constituting the suspension means 2 . In FIG. 8A, three suspension members 4 are arranged in a triangular pyramid shape. In FIG. 8B, four suspension members 4 are arranged in a quadrangular pyramid shape. In FIG. 8C, six suspension members 4 are arranged in a hexagonal pyramid shape. By arranging a set of a plurality of suspension members 4 constituting the suspension means 2 in a three-dimensional manner, not only the X direction of FIG. 8 but also the horizontal force in the Y direction exhibits an earthquake resistance and vibration control function. can do.
[0032]
1 and 4 to 6 are not provided with an energy absorption mechanism or the like between the vibration control structure and the main structure. However, in order to improve the energy absorption function, the suspension vibration control structure shown in FIGS. An absorption mechanism or the like may be provided.
[0033]
[Effects of the present invention]
The suspension vibration control structure according to the first to fourth aspects of the present invention provides a seismic resistance by a so-called trigger mechanism against small-scale disturbances such as small and medium-sized earthquakes, winds, and environmental vibrations without providing a damper. If it functions and is constructed as a seismic control building, it can maintain a good living environment with little vibration. In addition, for large-scale disturbances, the seismic structure can be automatically switched to a damping structure, and the damping function can be demonstrated.
[0034]
Moreover, by selecting the material, length, cross-sectional dimensions, V-shaped (reverse V-shaped) angle, etc. of the suspension material as appropriate and changing the elongation of the suspension material in a stationary state, it is possible to easily change from a seismic structure to a damping structure. It is possible to set the horizontal force or horizontal displacement level to be switched to, and to create characteristics according to the structure.
[Brief description of the drawings]
FIGS. 1A to 1C are elevational views conceptually showing an embodiment of a suspended vibration control structure of the present invention.
FIG. 2 shows a principle diagram of the suspended vibration control structure of the present invention.
FIG. 3 is a diagram showing the relationship between the horizontal force and the horizontal displacement in FIG. 2;
FIG. 4 is an elevational view showing a different embodiment of the suspension vibration control structure of the present invention.
FIG. 5 is an elevational view showing still another embodiment of the suspension vibration control structure of the present invention.
FIG. 6 is an elevational view showing still another embodiment of the suspension vibration control structure of the present invention.
7 is a view showing a different configuration of the upper suspension point of the suspension member of FIG. 6. FIG.
FIGS. 8A to 8C are diagrams showing examples of arrangement of suspension members.
[Explanation of symbols]
3 main structure 2 suspension means
1 Damping structure 4, 4 Suspension material 4a, 4a 'Upper suspension point 4b, 4b' Lower suspension point 7 Vertical hole 8 Energy absorption mechanism

Claims

In suspension vibration control structure,
Damping structures are supported substantially horizontally hung downward from the main structure by its entirety a plurality of hanging means,
Each of the plurality of suspension means is configured as a set of a plurality of suspension members, and the suspension members forming a set have a V-shape in which the interval between the upper suspension points is wider than the interval between the lower suspension points, or The lower suspension points are arranged in an inverted V shape with a wider interval than the upper suspension points.
The suspension member is composed of a non-compressible member, and a plurality of suspension members constituting the suspension means in a stationary state in which the vibration control structure is suspended from the main structure, each within the elastic limit. To stretch and maintain a balanced state,
When the seismic control structure receives a horizontal force within the range in which the tensile force remains in all the suspension members that constitute the suspension means, it maintains the shaft rigidity and exhibits the earthquake resistance function.
If the seismic control structure receives a horizontal force that exceeds the slack of the suspension material located on the front side of the horizontal force acting direction in the suspension means, it will be loosened. A suspended seismic control structure that is suspended and has a structure that exhibits a seismic control function with reduced horizontal rigidity and a long period of natural vibration.

In suspension vibration control structure,
Damping structures are supported substantially horizontally hung downward from the main structure by its entirety a plurality of hanging means,
Each of the plurality of suspension means is configured as a set of a plurality of suspension members, and the suspension members forming a set have a V-shape in which the interval between the upper suspension points is wider than the interval between the lower suspension points, or The lower suspension points are arranged in an inverted V shape with a wider interval than the upper suspension points.
The upper or lower suspension point of each suspension member is configured such that the suspension member can move in a substantially axial direction,
The suspension member is composed of an anti-compressible member, and the plurality of suspension members constituting the suspension means in the stationary state where the vibration control structure is suspended from the main structure, each extend within an elastic limit. To maintain a balanced state,
When the seismic control structure receives a horizontal force within the range in which the tensile force remains in all the suspension members that constitute the suspension means, it maintains the shaft rigidity and exhibits the earthquake resistance function.
If the seismic control structure receives a horizontal force that exceeds the tensile force of the suspension material located on the front side of the horizontal force acting direction in the suspension means, it is suspended only by the other suspension material with the remaining tensile force. Suspended seismic control structure, which has a structure that exhibits a seismic control function with reduced horizontal rigidity and a long period of natural vibration.

The suspension vibration control structure according to claim 1 or 2, wherein a plurality of suspension members forming a set constituting the suspension means are arranged in a polygonal pyramid shape.

The upper part of each suspension member constituting the suspension means penetrates the main structure, or the lower part of the suspension member penetrates the vibration control structure, and the main structure or the control member is provided by a locking portion provided at each end. It is locked so that it can move to the seismic structure in the axial direction.
The suspended vibration control structure according to claim 2 or 3, wherein an energy absorption mechanism such as an elastic body and a damper is provided between the locking portion and the main structure or the vibration control structure. .