JP4162693B2 - Variable thickness shear panel type controller for bridge - Google Patents
Variable thickness shear panel type controller for bridge Download PDFInfo
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Description
本発明は、橋梁下部構造に固定した支承部材で橋梁上部構造を支持する橋梁に利用される変厚剪断パネル型制御装置に関する。 The present invention relates to a variable thickness shear panel control device used for a bridge that supports a bridge upper structure with a support member fixed to the bridge lower structure.
例えば特許文献１に開示されているように、橋梁下部構造と橋梁上部構造の間に低降伏点鋼からなる等厚剪断パネル型制御装置を設けて、橋梁の免震性能を向上させる技術は従来から知られている。
特許文献１の等厚剪断パネル型制御装置は断面Ｈ形状であり、平板状のウェブ１０と、ウェブ１０の両端部に連なりウェブ１０の変形を防止する一対のフランジ１３とを有している。
地震が起きた際に等厚剪断パネル型制御装置に水平荷重が掛かると、この水平荷重により等厚剪断パネル型制御装置が剪断変形（塑性変形）することにより、地震のエネルギーを吸収する。
The equal thickness shear panel type control device of Patent Document 1 has an H-shaped cross section, and includes a flat web 10 and a pair of flanges 13 connected to both ends of the web 10 to prevent deformation of the web 10.
When a horizontal load is applied to the equal thickness shear panel type control device when an earthquake occurs, the equal thickness shear panel type control device undergoes shear deformation (plastic deformation) due to the horizontal load, thereby absorbing the energy of the earthquake.
しかし特許文献１の等厚剪断パネル型制御装置は剪断変形（塑性変形）し難い（破断し易い）ので、十分な免震性能が得ることができない。
さらに、上記等厚剪断パネル型制御装置はウェブ１０の他に一対のフランジ１３を備える複雑な構造なので、製造コストが高くなってしまう。
However, the equal thickness shear panel type control device of Patent Document 1 is difficult to shear (plastically deform) (is easily broken), so that sufficient seismic isolation performance cannot be obtained.
Furthermore, since the said equal thickness shear panel type | mold control apparatus is a complicated structure provided with a pair of flange 13 other than the web 10, a manufacturing cost will become high.
本発明の目的は、簡単な構造でありながら十分な免震性能を発揮する橋梁用変厚剪断パネル型制御装置を提供することにある。 It is an object of the present invention to provide a bridge thickness-change shear panel type control device that exhibits sufficient seismic isolation performance with a simple structure.
本発明の橋梁用変厚剪断パネル型制御装置は、橋梁下部構造と橋梁上部構造とを連結する、低降伏点鋼からなる変厚剪断パネル型制御装置であって、上記橋梁下部構造の上記橋梁上部構造との対向部に連結される下部連結部と、上記橋梁上部構造の上記橋梁下部構造との対向部に連結される上部連結部と、上記下部連結部と上部連結部を接続する塑性変形部と、該塑性変形部の表裏両面に凹設した、正面視円形で中心部に向かうにつれて凹み量が増大する曲面状凹部と、を備えることを特徴としている。 A thickness-change shear panel type control device for a bridge according to the present invention is a thickness-change shear panel-type control device made of low yield point steel, which connects a bridge lower structure and a bridge upper structure, and includes the bridge lower structure. A lower connecting portion connected to the facing portion of the upper structure; an upper connecting portion connected to the facing portion of the bridge upper structure of the bridge lower structure; and a plastic deformation connecting the lower connecting portion and the upper connecting portion. And a curved concave portion that is recessed on both the front and back surfaces of the plastic deformation portion and has a circular shape when viewed from the front and increases toward the center portion.
上記塑性変形部における上記曲面状凹部の外側部分が、該曲面状凹部が形成された部分より板厚が大きい強度部を構成するのが好ましい。 It is preferable that an outer portion of the curved concave portion in the plastic deformation portion constitutes a strength portion having a larger plate thickness than a portion where the curved concave portion is formed.
正面視において左右対称かつ上下対称であるのが好ましい。 It is preferable that it is bilaterally symmetric and vertically symmetric in front view.
上記表面側の上記曲面状凹部と裏面側の上記曲面状凹部が同心をなすのが好ましい。 The curved concave portion on the front surface side and the curved concave portion on the back surface side are preferably concentric.
上記表面側の上記曲面状凹部と裏面側の上記曲面状凹部が同一形状であるのが好ましい。 It is preferable that the curved concave portion on the front side and the curved concave portion on the back side have the same shape.
上記低降伏点鋼として極軟鋼を利用することができる。 Extremely mild steel can be used as the low yield point steel.
本発明の請求項１の変厚剪断パネル型制御装置は、塑性変形部の表裏両面に曲面状凹部を形成したことにより、従来の等厚剪断パネル型制御装置に比べて剪断変形（塑性変形）し易い（破断しにくい）ので、地震のエネルギーを効率的に吸収することが可能である。従って、従来の等厚剪断パネル型制御装置に比べて橋梁の免震性能を向上させることが可能である。
しかも曲面状凹部は、例えば旋盤を利用した切削加工により簡単に成形できるので、本発明の変厚剪断パネル型制御装置は低コストで製造できる。
The variable thickness shear panel type control device according to claim 1 of the present invention is formed by forming curved concave portions on both the front and back surfaces of the plastic deformation portion, so that shear deformation (plastic deformation) is achieved as compared with the conventional equal thickness shear panel type control device. Because it is easy to do (it is hard to break), it is possible to efficiently absorb the energy of the earthquake. Therefore, it is possible to improve the seismic isolation performance of the bridge as compared with the conventional equal thickness shear panel type control device.
Moreover, since the curved concave portion can be easily formed by cutting using a lathe, for example, the thickness change shear panel control device of the present invention can be manufactured at low cost.
請求項２のような強度部を構成すれば、この強度部が従来の等厚剪断パネル型制御装置のフランジと同様に変厚剪断パネル型制御装置の変形防止機能を発揮する。
しかも、強度部は変厚剪断パネル型制御装置の曲面状凹部を形成しない部分であり、特別な加工をせずに得られるので、捻り防止機能を有する変厚剪断パネル型制御装置を従来より簡単かつ低コストで製造できる。
If the strength part as in claim 2 is configured, this strength part exhibits the deformation preventing function of the variable thickness shear panel type control device in the same manner as the flange of the conventional equal thickness shear panel type control device.
In addition, the strength part is a part that does not form the curved concave portion of the variable thickness shear panel type control device, and can be obtained without special processing, so the variable thickness shear panel type control device having a twist preventing function is easier than before. And it can be manufactured at low cost.
変厚剪断パネル型制御装置を請求項３から５のように構成すれば、変厚剪断パネル型制御装置が剪断変形（塑性変形）し易くなる。従って、地震のエネルギーをより効率良く吸収できる。 If the variable thickness shear panel type control device is configured as in claims 3 to 5, the variable thickness shear panel type control device is easily sheared (plastically deformed). Therefore, the energy of the earthquake can be absorbed more efficiently.
請求項６のように、極軟鋼により変厚剪断パネル型制御装置を成形すれば、塑性変形部がより塑性変形し易くなるので、免震機能が向上する。 According to the sixth aspect of the present invention, if the variable shear panel control device is formed of extremely mild steel, the plastic deformation portion becomes more easily plastically deformed, so that the seismic isolation function is improved.
以下、本発明の一実施形態について添付図面を参照しながら説明する。なお、以下の説明中における左右方向は図１を基準とし、前後方向は図１の紙面に直交する方向とする。
本実施形態の橋梁Ａは以下の構造である。
地盤Ｇには複数の橋梁下部構造（橋脚）１０が前後方向に並べて固定してある。各橋梁下部構造１０の平坦な上面には、左右一対の可動支承部材１２の下端部が固定してある。そして、各橋梁下部構造１０に固定された左右の可動支承部材１２の上端面に前後方向に延びる橋梁上部構造（桁や床版等からなる）２０の下面が固定してある。周知のように各可動支承部材１２は橋梁下部構造１０の鉛直方向の荷重を受けるだけでなく、地震時に橋梁上部構造２０に水平方向の力が掛かった場合あるいは橋梁下部構造１０や橋梁上部構造２０に温度変化による収縮が起こった場合に、自身の一部を変形させることにより、橋梁上部構造２０を橋梁下部構造１０に対して水平方向にスライドさせる機能を有する。
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, the left-right direction is based on FIG. 1, and the front-rear direction is a direction perpendicular to the plane of FIG.
The bridge A of the present embodiment has the following structure.
A plurality of bridge lower structures (piers) 10 are fixed to the ground G side by side in the front-rear direction. On the flat upper surface of each bridge lower structure 10, the lower ends of a pair of left and right movable support members 12 are fixed. And the lower surface of the bridge upper structure 20 (comprising girder, floor slab, etc.) extending in the front-rear direction is fixed to the upper end surfaces of the left and right movable support members 12 fixed to each bridge lower structure 10. As is well known, each movable support member 12 not only receives the vertical load of the bridge lower structure 10 but also when a horizontal force is applied to the bridge upper structure 20 during an earthquake, or the bridge lower structure 10 and the bridge upper structure 20. When contraction due to temperature change occurs, the bridge upper structure 20 has a function of sliding horizontally with respect to the bridge lower structure 10 by deforming a part of itself.
図示するように、各橋梁下部構造１０の上面の左右方向の中央部と橋梁上部構造２０の下面の左右方向の中央部の間は、以下に説明する構造の剪断変形装置３０によって連結してある。
橋梁下部構造１０の上面には平板状の下部連結板３１の下面が載置してあり、下部連結板３１の上面には前後一対の下部支持板３３が載置してある。図３に示すように、前後の下部支持板３３は互いに同一形状の断面Ｌ字形の部材であり、下部支持板３３は水平片３４と垂直片３５を具備している。下部連結板３１及び水平片３４の３箇所には互いに連通する貫通孔３２と貫通孔３６が左右方向に並べて穿設してあり、さらに橋梁下部構造１０の上面の各貫通孔３２と対応する６箇所には各貫通孔３２と連通するねじ孔１１が穿設してある。さらに、下部支持板３３の垂直片３５には３つの貫通孔３７が左右方向に並べて穿設してある。そして、互いに連通する貫通孔３２と貫通孔３６にはボルトＢ１が挿入してあり、ボルトＢ１の下端部がねじ孔１１に螺合しているので、下部連結板３１は橋梁下部構造１０の上面に固定され、前後の下部支持板３３は両者の間に前後方向の隙間を形成しつつ下部連結板３１の上面に固定されている。
一方、橋梁上部構造２０の下面には平板状の上部連結板４１の上面が当接しており、上部連結板４１の下面には前後一対の上部支持板４３の上面が当接している。図３に示すように、前後の上部支持板４３は下部支持板３３と同形状であり、水平片４４と垂直片４５を具備している。上部連結板４１及び水平片４４の３箇所には互いに連通する貫通孔４２と貫通孔４６が左右方向に並べて穿設してあり、さらに橋梁上部構造２０の下面の各貫通孔４２と対応する６箇所には各貫通孔４２と連通するねじ孔２１が穿設してある。さらに、上部支持板４３の垂直片４５には３つの貫通孔４７が左右方向に並べて穿設してある。そして、互いに連通する貫通孔４２と貫通孔４６にはボルトＢ２が挿入してあり、ボルトＢ２の上端部がねじ孔２１に螺合しているので、上部連結板４１は橋梁上部構造２０の下面に固定され、前後の上部支持板４３は両者の間に前後方向の隙間を形成しつつ上部連結板４１の下面に固定されている。
As shown in the figure, the center portion in the left-right direction of the upper surface of each bridge lower structure 10 and the center portion in the left-right direction of the lower surface of the bridge upper structure 20 are connected by a shear deformation device 30 having a structure described below. .
A lower surface of a flat lower connection plate 31 is placed on the upper surface of the bridge lower structure 10, and a pair of front and rear lower support plates 33 are placed on the upper surface of the lower connection plate 31. As shown in FIG. 3, the front and rear lower support plates 33 are L-shaped members having the same shape, and the lower support plate 33 includes a horizontal piece 34 and a vertical piece 35. A through hole 32 and a through hole 36 communicating with each other are formed side by side in the left-right direction at three locations of the lower connecting plate 31 and the horizontal piece 34, and 6 corresponding to each through hole 32 on the upper surface of the bridge lower structure 10. Screw holes 11 communicating with the respective through holes 32 are formed at the locations. Furthermore, three through holes 37 are formed in the vertical piece 35 of the lower support plate 33 side by side in the left-right direction. Since the bolt B1 is inserted into the through hole 32 and the through hole 36 that communicate with each other, and the lower end portion of the bolt B1 is screwed into the screw hole 11, the lower connecting plate 31 is the upper surface of the bridge lower structure 10. The front and rear lower support plates 33 are fixed to the upper surface of the lower connecting plate 31 while forming a front-rear direction gap therebetween.
On the other hand, the upper surface of the flat upper connection plate 41 is in contact with the lower surface of the bridge upper structure 20, and the upper surfaces of the pair of front and rear upper support plates 43 are in contact with the lower surface of the upper connection plate 41. As shown in FIG. 3, the front and rear upper support plates 43 have the same shape as the lower support plate 33 and include a horizontal piece 44 and a vertical piece 45. A through-hole 42 and a through-hole 46 communicating with each other are formed side by side in the left-right direction at three locations of the upper connecting plate 41 and the horizontal piece 44, and 6 corresponding to each through-hole 42 on the lower surface of the bridge upper structure 20. Screw holes 21 communicating with the respective through holes 42 are formed at the locations. Further, three through holes 47 are formed in the vertical piece 45 of the upper support plate 43 side by side in the left-right direction. The bolt B2 is inserted into the through hole 42 and the through hole 46 that communicate with each other, and the upper end portion of the bolt B2 is screwed into the screw hole 21, so that the upper connecting plate 41 is the lower surface of the bridge upper structure 20. The upper and lower upper support plates 43 are fixed to the lower surface of the upper connecting plate 41 while forming a gap in the front-rear direction therebetween.
前後の下部支持板３３と前後の上部支持板４３は変厚剪断パネル型制御装置５０によって連結されている。
変厚剪断パネル型制御装置５０は、上下対称かつ左右対称な正面視略Ｈ字形状の板材であり、低降伏点鋼の一種である極軟鋼によって成形してある。極軟鋼は低降伏点鋼の中でも特に降伏点が低い（１００Ｎ／ｍｍ2以下）鋼材であり、ＳＳ４００やＳＭ４００等の普通鋼に比べて降伏点が低く、かつ普通鋼に比べて大きな伸び性能を有する。
変厚剪断パネル型制御装置５０は、正面視略矩形の塑性変形部５１と、塑性変形部５１の上下両端に連続し塑性変形部５１より左右幅が大きい下部連結部５２及び上部連結部５３を備えている。塑性変形部５１の左右両側部と下部連結部５２の接続部はＲ面となっており、塑性変形部５１の左右両側部と上部連結部５３の接続部もＲ面となっている。下部連結部５２には３つの貫通孔５４が左右方向に並べて穿設してあり、上部連結部５３には３つの貫通孔５５が左右方向に並べて穿設してある。
さらに、塑性変形部５１の前後両面の中心部には正面視円形の曲面状凹部５６と曲面状凹部５７が凹設してある。曲面状凹部５６と曲面状凹部５７は同一形状の凹部であり、両者の中心点は互いに同心をなしている。曲面状凹部５６と曲面状凹部５７は、例えば旋盤を利用した切削加工により凹設可能である。曲面状凹部５６と曲面状凹部５７は、その外周側から中心に向かうにつれて凹み量が徐々に増大する、断面形状が放物線をなす凹部である。図４に示すように、塑性変形部５１の曲面状凹部５６及び曲面状凹部５７を除いた部分は強度部５８を構成している。図４に示すように強度部５８、下部連結部５２及び上部連結部５３の板厚は一定であり、これらの部分は曲面状凹部５６及び曲面状凹部５７が形成された部分より板厚が大きい。
The front and rear lower support plates 33 and the front and rear upper support plates 43 are connected by a variable shear panel control device 50.
The variable shear panel type control device 50 is a plate material having a substantially H-shape in front view that is vertically and laterally symmetric, and is formed of extremely mild steel that is a kind of low yield point steel. Extremely mild steel is a steel material that has a particularly low yield point (less than 100 N / mm 2 ) among low yield point steels, has a lower yield point than ordinary steels such as SS400 and SM400, and has a higher elongation performance than ordinary steels. Have.
The thickness change shear panel type control device 50 includes a plastic deformation portion 51 having a substantially rectangular shape when viewed from the front, and a lower connection portion 52 and an upper connection portion 53 that are continuous with the upper and lower ends of the plastic deformation portion 51 and have a lateral width larger than that of the plastic deformation portion 51. I have. The left and right side portions of the plastic deformation portion 51 and the connection portion of the lower connection portion 52 are R surfaces, and the left and right side portions of the plastic deformation portion 51 and the connection portion of the upper connection portion 53 are also R surfaces. The lower connecting portion 52 has three through holes 54 aligned in the left-right direction, and the upper connecting portion 53 has three through holes 55 aligned in the left-right direction.
Further, a curved concave portion 56 and a curved concave portion 57 that are circular in front view are provided in the center of both front and rear surfaces of the plastic deformation portion 51. The curved concave portion 56 and the curved concave portion 57 are concave portions having the same shape, and their center points are concentric with each other. The curved concave portion 56 and the curved concave portion 57 can be recessed by, for example, cutting using a lathe. The curved concave portion 56 and the curved concave portion 57 are concave portions whose cross-sectional shape forms a parabola, and the amount of the concave portion gradually increases from the outer peripheral side toward the center. As shown in FIG. 4, the portion of the plastic deformation portion 51 excluding the curved concave portion 56 and the curved concave portion 57 constitutes a strength portion 58. As shown in FIG. 4, the plate thickness of the strength portion 58, the lower connecting portion 52 and the upper connecting portion 53 is constant, and these portions are thicker than the portions where the curved concave portions 56 and the curved concave portions 57 are formed. .
図２、図３及び図６に示すように、変厚剪断パネル型制御装置５０の下部連結部５２は前後の下部支持板３３の垂直片３５の間に挿入されている（下部連結部５２の板厚は前後の下部支持板３３の間の隙間寸法と略同一である）。３つの貫通孔５４は前後の垂直片３５の３つの貫通孔３７とそれぞれ連通しており、互いに連通する前側の下部支持板３３の貫通孔３７、貫通孔５４及び後側の下部支持板３３の貫通孔３７には、前後方向に延びるボルトＢ３がそれぞれ前方から挿入してある。さらに、後側の下部支持板３３の垂直片３５の後方に突出するボルトＢ３の後端部にはナット６０が螺合しており、各ナット６０は後側の下部支持板３３の垂直片３５に当接している。このように変厚剪断パネル型制御装置５０の下部連結部５２は前後の垂直片３５に移動不能に固定されている。
同様に変厚剪断パネル型制御装置５０の上部連結部５３は前後の上部支持板４３の垂直片４５の間に挿入されている（上部連結部５３の板厚は前後の上部支持板４３の間の隙間寸法と略同一である）。３つの貫通孔５５は前後の垂直片４５の３つの貫通孔４７とそれぞれ連通しており、互いに連通する前側の上部支持板４３の貫通孔４７、貫通孔５５及び後側の上部支持板４３の貫通孔４７には前後方向に延びるボルトＢ４がそれぞれ前方から挿入してある。さらに、後側の上部支持板４３の垂直片４５の後方に突出するボルトＢ４の後端部にはナット６１が螺合しており、各ナット６１は上部支持板４３の垂直片４５に当接している。このように変厚剪断パネル型制御装置５０の上部連結部５３は前後の垂直片４５に移動不能に固定されている。
以上説明した下部連結板３１、下部支持板３３、上部連結板４１、上部支持板４３、変厚剪断パネル型制御装置５０、ボルトＢ１、ボルトＢ２、ボルトＢ３、ボルトＢ４、ナット６０及びナット６１が剪断変形装置３０の構成要素である。
As shown in FIGS. 2, 3, and 6, the lower connection portion 52 of the thickness change shear panel type control device 50 is inserted between the vertical pieces 35 of the front and rear lower support plates 33 (of the lower connection portion 52. The plate thickness is substantially the same as the gap size between the front and rear lower support plates 33). The three through holes 54 communicate with the three through holes 37 of the front and rear vertical pieces 35, respectively. The through holes 37, the through holes 54, and the rear lower support plate 33 of the front lower support plate 33 communicate with each other. Bolts B3 extending in the front-rear direction are inserted into the through holes 37 from the front. Further, a nut 60 is screwed to the rear end portion of the bolt B3 protruding rearward of the vertical piece 35 of the rear lower support plate 33, and each nut 60 is a vertical piece 35 of the lower lower support plate 33. Abut. As described above, the lower connecting portion 52 of the variable shear panel control device 50 is fixed to the front and rear vertical pieces 35 so as not to move.
Similarly, the upper connecting portion 53 of the variable thickness shear panel type control device 50 is inserted between the vertical pieces 45 of the front and rear upper support plates 43 (the thickness of the upper connecting portion 53 is between the front and rear upper support plates 43. Is substantially the same as the gap dimension of The three through-holes 55 communicate with the three through-holes 47 of the front and rear vertical pieces 45, and the through-hole 47, the through-hole 55, and the rear upper support plate 43 of the front upper support plate 43 that communicate with each other. Bolts B4 extending in the front-rear direction are inserted into the through holes 47 from the front. Further, nuts 61 are screwed into the rear ends of the bolts B4 protruding rearward of the vertical pieces 45 of the upper support plate 43 on the rear side, and each nut 61 abuts on the vertical pieces 45 of the upper support plate 43. ing. As described above, the upper connecting portion 53 of the variable shear panel control device 50 is fixed to the front and rear vertical pieces 45 so as not to move.
The lower connecting plate 31, the lower supporting plate 33, the upper connecting plate 41, the upper supporting plate 43, the variable shear panel control device 50, the bolt B1, the bolt B2, the bolt B3, the bolt B4, the nut 60, and the nut 61 described above. It is a component of the shear deformation device 30.
以上構成の剪断変形装置３０は橋梁下部構造１０と橋梁上部構造２０を連結しているが、剪断変形装置３０には橋梁上部構造２０を支承する（橋梁上部構造２０の荷重を受ける）機能はなく、剪断変形装置３０は地震により橋梁Ａが振動したときに機能する。
即ち、地震のエネルギーにより橋梁上部構造２０が橋梁下部構造１０に対して左右方向にスライドしようとすると、この動き（エネルギー）が橋梁上部構造２０から上部連結板４１及び上部支持板４３を介して変厚剪断パネル型制御装置５０に伝わる。すると、変厚剪断パネル型制御装置５０は最初に弾性変形を起こし、次いで板厚が最も薄い曲面状凹部５６及び曲面状凹部５７が形成された部分の中心から塑性変形（剪断変形）を起こす。この塑性変形は曲面状凹部５６及び曲面状凹部５７の中心から徐々に外周側に放射状に拡がり、やがて曲面状凹部５６及び曲面状凹部５７の外周縁部に達する。さらにこの塑性変形は、強度部５８側に放射状に拡大するので、変厚剪断パネル型制御装置５０は図６のような形状となる（塑性変形部５１は略平行四辺形となり、曲面状凹部５６及び曲面状凹部５７は楕円形となる）。変厚剪断パネル型制御装置５０は、このような塑性変形を起こす過程で降伏点に達する。降伏点に達すると塑性変形部５１の弾塑性変形量が急激に増大し、やがて塑性変形部５１全体が歪硬化を起こし、さらに変形が進行すると塑性変形部５１の荷重に対する抵抗力が低下する。また、塑性変形部５１にこのような変形が生じると、曲面状凹部５６は変形前に比べて僅かに板厚が増し、強度部５８は変形前に比べて僅かに板厚が減少する。
The shear deformation device 30 configured as described above connects the bridge lower structure 10 and the bridge upper structure 20, but the shear deformation device 30 does not have a function of supporting the bridge upper structure 20 (receiving the load of the bridge upper structure 20). The shear deformation device 30 functions when the bridge A vibrates due to an earthquake.
That is, when the bridge upper structure 20 tries to slide in the left-right direction with respect to the bridge lower structure 10 due to the energy of the earthquake, this movement (energy) changes from the bridge upper structure 20 via the upper connecting plate 41 and the upper support plate 43. It is transmitted to the thickness shear panel type control device 50. Then, the thickness change shear panel type control device 50 first causes elastic deformation, and then causes plastic deformation (shear deformation) from the center of the portion where the curved concave portion 56 and the curved concave portion 57 having the smallest thickness are formed. This plastic deformation gradually spreads radially outward from the center of the curved concave portion 56 and the curved concave portion 57, and eventually reaches the outer peripheral edge of the curved concave portion 56 and the curved concave portion 57. Further, since this plastic deformation expands radially toward the strength portion 58 side, the thickness change shear panel type control device 50 has a shape as shown in FIG. 6 (the plastic deformation portion 51 has a substantially parallelogram shape and has a curved concave portion 56. And the curved recess 57 is oval). The thickness change shear panel type control device 50 reaches the yield point in the process of causing such plastic deformation. When the yield point is reached, the amount of elasto-plastic deformation of the plastic deformation portion 51 increases rapidly, eventually the entire plastic deformation portion 51 undergoes strain hardening, and when the deformation proceeds further, the resistance of the plastic deformation portion 51 to the load decreases. When such deformation occurs in the plastic deformation portion 51, the curved concave portion 56 slightly increases in thickness compared to before deformation, and the strength portion 58 slightly decreases in thickness compared to before deformation.
本実施形態の変厚剪断パネル型制御装置５０は曲面状凹部５６及び曲面状凹部５７を形成したことにより、従来の等厚剪断パネル型制御装置に比べて剪断変形（塑性変形）し易くなっている（破断しにくくなっている）ので、地震のエネルギーを効率的に吸収することが可能である。従って、従来の等厚剪断パネル型制御装置に比べて橋梁Ａの免震性能を向上させることができる。
さらに、変厚剪断パネル型制御装置５０は低降伏点鋼からなる板材に曲面状凹部５６及び曲面状凹部５７を成形するだけで製造できるので、従来の等厚剪断パネル型制御装置に比べて製造が簡単であり、しかも製造コストを抑えることが可能である。
また、本実施形態の変厚剪断パネル型制御装置５０は強度部５８を具備するので、フランジを具備する従来の等厚剪断パネル型制御装置と同様に変厚剪断パネル型制御装置５０の変形を防止できる。しかも、強度部５８は、塑性変形部５１の曲面状凹部５６及び曲面状凹部５７を除いた部分であり、なんら加工を施さずに得られるので、この点においても本実施形態の変厚剪断パネル型制御装置５０は製造が簡単である。
The variable thickness shear panel type control device 50 of the present embodiment is more easily sheared (plastically deformed) than the conventional equal thickness shear panel type control device by forming the curved concave portion 56 and the curved concave portion 57. It is possible to absorb the earthquake energy efficiently. Therefore, the seismic isolation performance of the bridge A can be improved as compared with the conventional equal thickness shear panel type control device.
Further, the variable thickness shear panel type control device 50 can be manufactured by simply forming the curved concave portion 56 and the curved concave portion 57 on a plate made of low yield point steel, and therefore, manufactured in comparison with the conventional equal thickness shear panel type control device. Is simple, and the manufacturing cost can be reduced.
Moreover, since the thickness change shear panel type control apparatus 50 of this embodiment is equipped with the intensity | strength part 58, the deformation | transformation of the thickness change shear panel type control apparatus 50 is carried out similarly to the conventional equal thickness shear panel type control apparatus provided with a flange. Can be prevented. Moreover, the strength portion 58 is a portion excluding the curved concave portion 56 and the curved concave portion 57 of the plastic deformation portion 51, and is obtained without any processing. In this respect as well, the thickness change shear panel of this embodiment is used. The mold controller 50 is easy to manufacture.
また、変厚剪断パネル型制御装置５０の下部連結部５２と下部支持板３３を前後方向に延びるボルトＢ３（及びナット６０）で連結し、かつ変厚剪断パネル型制御装置５０の上部連結部５３と上部支持板４３を前後方向に延びるボルトＢ４（及びナット６１）で連結しているので、変厚剪断パネル型制御装置５０は下部支持板３３に対してボルトＢ３回り及びボルトＢ４回りに僅かに回転可能である。従って、地震によって橋梁上部構造２０が橋梁下部構造１０に対して左右方向にスライドしようとすると、変厚剪断パネル型制御装置５０が下部支持板３３と上部支持板４３に対して僅かに回転することにより地震のエネルギーを吸収するので、下部連結部５２と下部支持板３３及び上部連結部５３と上部支持板４３を溶接により固定する場合に比べて地震のエネルギーを効率的に吸収できる。
さらに、変厚剪断パネル型制御装置５０は上下対称かつ左右対称形状であり、しかも曲面状凹部５６と曲面状凹部５７が互いに同心をなす同一形状なので、変厚剪断パネル型制御装置５０は剪断変形し易く、地震のエネルギーを効率良く吸収できる。
Further, the lower connecting portion 52 of the variable thickness shear panel type control device 50 and the lower support plate 33 are connected by bolts B3 (and nuts 60) extending in the front-rear direction, and the upper connecting portion 53 of the variable thickness shear panel type control device 50. And the upper support plate 43 are connected by bolts B4 (and nuts 61) extending in the front-rear direction, so that the thickness change shear panel type control device 50 is slightly around the bolts B3 and B4 with respect to the lower support plate 33. It can be rotated. Therefore, when the bridge upper structure 20 tries to slide in the left-right direction with respect to the bridge lower structure 10 due to the earthquake, the thickness change shear panel control device 50 slightly rotates with respect to the lower support plate 33 and the upper support plate 43. Therefore, the energy of the earthquake can be absorbed more efficiently than the case where the lower connecting portion 52 and the lower support plate 33 and the upper connecting portion 53 and the upper support plate 43 are fixed by welding.
Further, the thickness change shear panel type control device 50 is vertically symmetrical and bilaterally symmetric, and the curved concave portion 56 and the curved concave portion 57 have the same shape concentric with each other. It is easy to do and can absorb the energy of earthquake efficiently.
以上、上記実施形態を利用して本発明を説明したが、本発明は本実施形態に限定されるものではなく、様々な変更を施しながら実施可能である。
例えば、曲面状凹部５６及び曲面状凹部５７を断面形状が放物線をなす形状としてあるが、曲面状凹部５６及び曲面状凹部５７は球面の一部をなす形状であってもよい。
変厚剪断パネル型制御装置５０を、極軟鋼ではない低降伏点鋼（降伏点が２２５Ｎ／ｍｍ2以下の鋼材）によって成形してもよい。
As mentioned above, although this invention was demonstrated using the said embodiment, this invention is not limited to this embodiment, It can implement, giving various changes.
For example, although the curved concave portion 56 and the curved concave portion 57 have a cross-sectional shape that forms a parabola, the curved concave portion 56 and the curved concave portion 57 may have a shape that forms part of a spherical surface.
The variable shear panel type control device 50 may be formed of low yield point steel (steel material having a yield point of 225 N / mm 2 or less) that is not extremely mild steel.
１０ 橋梁下部構造
１１ ねじ孔
１２ 可動支承部材
２０ 橋梁上部構造
２１ ねじ孔
３０ 剪断変形装置
３１ 下部連結板
３２ 貫通孔
３３ 下部支持板
３４ 水平片
３５ 垂直片
３６ ３７ 貫通孔
４１ 上部連結板
４２ 貫通孔
４３ 上部支持板
４４ 水平片
４５ 垂直片
４６ ４７ 貫通孔
５０ 変厚剪断パネル型制御装置
５１ 塑性変形部
５２ 下部連結部
５３ 上部連結部
５４ ５５ 貫通孔
５６ ５７ 曲面状凹部
５８ 強度部
６０ ６１ ナット
Ａ 橋梁
Ｂ１ Ｂ２ Ｂ３ Ｂ４ 固定ボルト
DESCRIPTION OF SYMBOLS 10 Bridge lower structure 11 Screw hole 12 Movable support member 20 Bridge upper structure 21 Screw hole 30 Shear deformation apparatus 31 Lower connection plate 32 Through hole 33 Lower support plate 34 Horizontal piece 35 Vertical piece 36 37 Through hole 41 Upper connection plate 42 Through hole 43 Upper support plate 44 Horizontal piece 45 Vertical piece 46 47 Through hole 50 Variable shear panel control device 51 Plastic deformation part 52 Lower connection part 53 Upper connection part 54 55 Through hole 56 57 Curved concave part 58 Strength part 60 61 Nut A Bridge B1 B2 B3 B4 Fixing bolt
Claims (6)
上記橋梁下部構造の上記橋梁上部構造との対向部に連結される下部連結部と、
上記橋梁上部構造の上記橋梁下部構造との対向部に連結される上部連結部と、
上記下部連結部と上部連結部を接続する塑性変形部と、
該塑性変形部の表裏両面に凹設した、正面視円形で中心部に向かうにつれて凹み量が増大する曲面状凹部と、
を備えることを特徴とする橋梁用変厚剪断パネル型制御装置。 A variable shear panel control device made of low yield point steel that connects the bridge substructure and the bridge superstructure,
A lower connecting portion connected to a portion of the bridge lower structure facing the bridge upper structure;
An upper connecting portion connected to a portion of the bridge upper structure facing the bridge lower structure;
A plastic deformation portion connecting the lower connecting portion and the upper connecting portion;
Concave portions on both the front and back surfaces of the plastic deformation portion, and a curved concave portion in which the dent amount increases toward the center portion in a circular shape in front view;
A variable thickness shear panel type control device for bridges.
上記塑性変形部における上記曲面状凹部の外側部分が、該曲面状凹部が形成された部分より板厚が大きい強度部を構成する橋梁用変厚剪断パネル型制御装置。 In the thickness change shear panel type control device for bridge according to claim 1,
A variable thickness shear panel type control device for a bridge in which an outer portion of the curved concave portion in the plastic deformation portion constitutes a strength portion having a larger plate thickness than a portion where the curved concave portion is formed.
正面視において左右対称かつ上下対称である橋梁用変厚剪断パネル型制御装置。 In the thickness change shear panel type control apparatus for bridges of Claim 1 or 2,
A thickness-change shear panel type control device for bridges that is symmetrical in the left and right direction when viewed from the front.
上記表面側の上記曲面状凹部と裏面側の上記曲面状凹部が同心をなす橋梁用変厚剪断パネル型制御装置。 In the thickness-change shear panel type control apparatus for bridges of any one of Claim 1 to 3,
A bridge thickness-change shear panel control device in which the curved concave portion on the front surface side and the curved concave portion on the back surface side are concentric.
上記表面側の上記曲面状凹部と裏面側の上記曲面状凹部が同一形状である橋梁用変厚剪断パネル型制御装置。 In the thickness-change shear panel type control apparatus for bridges of any one of Claim 1 to 4,
The bridge thickness-change shear panel control device, wherein the curved concave portion on the front side and the curved concave portion on the back side have the same shape.
上記低降伏点鋼が極軟鋼である橋梁用変厚剪断パネル型制御装置。 In the thickness-change shear panel type control apparatus for bridges of any one of Claim 1 to 5,
A variable thickness shear panel type control device for bridges, wherein the low yield point steel is extra soft steel.
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