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Title: 振動台模型実験による杭基礎一体型鋼管集成橋脚の耐震性能評価
Other Titles: Seismic performance of a multiple steel pipes bridge pier integrated by pile foundation without a footing using shaking table tests
Authors: 磯部, 公一1 Browse this author →KAKEN DB
澤村, 康生2 Browse this author
杉山, 裕樹3 Browse this author
篠原, 聖二4 Browse this author
曽我, 恭匡5 Browse this author
小林, 寛6 Browse this author
木村, 亮7 Browse this author
Authors(alt): Isobe, Koichi1
Sawamura, Yasuo2
Sugiyama, Hiroki3
Shinohara, Masatsugu4
Soga, Yasumasa5
Kobayashi, Hiroshi6
Kimura, Makoto7
Keywords: multiple steel pipes bridge pier integrated with pile foundation
damage control design
pile foundation
shaking table test
hysteretic shear damper
Issue Date: 2016
Publisher: 土木学会
Journal Title: 土木学会論文集C(地圏工学)
Journal Title(alt): Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)
Volume: 72
Issue: 4
Start Page: 327
End Page: 338
Publisher DOI: 10.2208/jscejge.72.327
Abstract: 損傷制御設計を適用した新しい橋脚形式の鋼管集成橋脚に対し,基礎を合理化した杭基礎一体型鋼管集成橋脚を提案し,従来のフーチング形式と地震時挙動を比較することで構造成立性を検討している.本稿では,杭基礎一体型の利点である橋脚と基礎の剛性差の解消による柱基部のひずみの緩和,フーチングの省略による杭基礎の負担重量の軽減,ならびに地中梁の設置による杭体の応答ひずみや杭頭変位の抑制効果を実験的に確認するために,1/20サイズで作製した模型に対し振動台実験を実施した.その結果,上述の利点に加え,杭基礎一体型鋼管集成橋脚はせん断パネルの塑性変形に伴うエネルギー吸収機能がより長く有効に働き,せん断パネル降伏後も主部材に大きな残存耐力を保持したことから,優れた変形性能を有していることを確認した.
A multiple steel pipes bridge pier integrated by pile foundation without a footing has been proposed to design a rational foundation of the bridge pier structure. Based on the past achievements, the proposed substructures possess an excellent advantage of reduction of strain at the column through strain decentralization at footing point. In addition, reduction in footing weight contributes to decrease pile strain. On the other hand, the proposed substructure has some disadvantages i.e. increase in strain and displacement of piles. But it has been revealed that the strain generated at piles can be minimized by using underground beams around pile heads in the ground. In this paper, the seismic performance of the proposed bridge pier structure grounded in dry sand and liquefiable sand is evaluated based on the large-scale shaking table tests using bridge pier and foundation models with the scale of 1/20. As with the past achievements, the proposed structure has advantages of strain reduction of column by strain decentralization at footing point. It is recognized that it has high seismic performance and high toughness in view of the fact that the main members (columns and piles) hold a large residual strength after yielding of the shear panels.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 磯部 公一

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