A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
PEDESTAL STRUCTURE
PROBLEM TO BE SOLVED: To realize a pedestal structure capable of restraining excessively resonating.SOLUTION: A pedestal structure 100 has excellent load holding performance by having rigidity for properly supporting a superstructure 1 for making a railroad and a vehicle travel, by connecting a core column 10 and a cylindrical outer column 20 by a yielding fuse member 30 in normal time or L1 earthquake occurrence time. The pedestal structure 100 broken in the yielding fuse member 30 in L2 earthquake occurrence time being earthquake motion of a size of exceeding a predetermined limit, has excellent earthquake time load resistance performance for preventing excessive displacement of the core column 10 and the cylindrical outer column 20 by changing to a flexible structure for periodically lengthening its natural period by elastically deforming an elastic deformation body 40, and also comprises the resonance self-avoiding function of restraining the pedestal structure 100 from excessively resonating by switching an elastic modulus of the elastic deformation body 40 when swinging of the pedestal structure 100 is amplified since a resonance phenomenon is caused when a natural period of the ground and the natural period of the pedestal structure 100 coincide.SELECTED DRAWING: Figure 1
【課題】過度に共振するのを抑制できる脚柱構造体を実現する。【解決手段】脚柱構造体１００は、通常時あるいはＬ１地震発生時には、降伏ヒューズ部材３０によって芯柱１０と筒状外柱２０とが繋がれており、鉄道や車両が走行する上部工１を適切に支持する剛性を有し優れた荷重保持性能を備えている。また所定の限度を超える大きさの地震動であるＬ２地震発生時に降伏ヒューズ部材３０が破壊された脚柱構造体１００は、弾性変形体４０が弾性変形することによってその固有周期を長周期化する柔構造に変化することで、芯柱１０および筒状外柱２０の過大変位を防止する優れた地震時耐荷性能を備えている。更に地盤の固有周期と脚柱構造体１００の固有周期とが一致して共振現象が起こり脚柱構造体１００の揺れが増幅されてしまった場合に、弾性変形体４０の弾性係数が切り替わることで脚柱構造体１００が過度に共振するのを抑制する共振自己回避機能を備えている。【選択図】図１
PEDESTAL STRUCTURE
PROBLEM TO BE SOLVED: To realize a pedestal structure capable of restraining excessively resonating.SOLUTION: A pedestal structure 100 has excellent load holding performance by having rigidity for properly supporting a superstructure 1 for making a railroad and a vehicle travel, by connecting a core column 10 and a cylindrical outer column 20 by a yielding fuse member 30 in normal time or L1 earthquake occurrence time. The pedestal structure 100 broken in the yielding fuse member 30 in L2 earthquake occurrence time being earthquake motion of a size of exceeding a predetermined limit, has excellent earthquake time load resistance performance for preventing excessive displacement of the core column 10 and the cylindrical outer column 20 by changing to a flexible structure for periodically lengthening its natural period by elastically deforming an elastic deformation body 40, and also comprises the resonance self-avoiding function of restraining the pedestal structure 100 from excessively resonating by switching an elastic modulus of the elastic deformation body 40 when swinging of the pedestal structure 100 is amplified since a resonance phenomenon is caused when a natural period of the ground and the natural period of the pedestal structure 100 coincide.SELECTED DRAWING: Figure 1
【課題】過度に共振するのを抑制できる脚柱構造体を実現する。【解決手段】脚柱構造体１００は、通常時あるいはＬ１地震発生時には、降伏ヒューズ部材３０によって芯柱１０と筒状外柱２０とが繋がれており、鉄道や車両が走行する上部工１を適切に支持する剛性を有し優れた荷重保持性能を備えている。また所定の限度を超える大きさの地震動であるＬ２地震発生時に降伏ヒューズ部材３０が破壊された脚柱構造体１００は、弾性変形体４０が弾性変形することによってその固有周期を長周期化する柔構造に変化することで、芯柱１０および筒状外柱２０の過大変位を防止する優れた地震時耐荷性能を備えている。更に地盤の固有周期と脚柱構造体１００の固有周期とが一致して共振現象が起こり脚柱構造体１００の揺れが増幅されてしまった場合に、弾性変形体４０の弾性係数が切り替わることで脚柱構造体１００が過度に共振するのを抑制する共振自己回避機能を備えている。【選択図】図１
PEDESTAL STRUCTURE
脚柱構造体
KOBAYASHI KAORU (author) / ITO YUKA (author)
2017-06-01
Patent
Electronic Resource
Japanese
IPC:
E01D
BRIDGES
,
Brücken