塑性ヒンジ領域にゴム層を有する鉄筋コンクリート橋脚の開発  [in Japanese] DEVELOPMENT OF A REINFORCED CONCRETE PIER WITH A RUBBER LAYER IN THE PLASTIC HINGE REGION  [in Japanese]

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Abstract

鉄筋コンクリート橋脚では変形性能の向上が重要であるが, いかに塑性ヒンジ区間で横拘束を高めてもコアコンクリートが損傷すれば地震後に大規模な復旧は避けられない. 本研究は, 塑性ヒンジ領域におけるコンクリートをゴム等の塑性変形の繰り返しに耐える材料で代替することにより, ドリフトで4%程度の変形に追従でき, かつコアコンクリートに大きな損傷を受けない新型橋脚を提案し, この実現性を繰り返し載荷実験, ファイバー要素解析から検討するものである. この結果, ゴム層の上下に鋼板を加硫接着し, これを橋脚躯体及びフーチングにアンカー筋で定着することによって開発目標を達成できる可能性があることを明らかにした.

No matter how the plastic hinge region is confined by ties, a reinforced concrete pier that suffered flexural damage in an extreme earthquake has to be repaired after the earthquake. Since failure of core concrete occurs only at the plastic hinge region, if a stable material under cyclic load excursions could replace the concrete at this region, the pier could perform satisfactorily without failure of concrete. Thus, repair after an earthquake could be eliminated. Based on such a concept, this paper proposes a new pier with a rubber layer at the bottom. Cyclic loading tests for 5 specimens with a 400mm×400mm section was conducted to clarify the performance. Various factors including the effect of confinement of rubber by steel plates and shear key were studied. Fiber element analysis was also conducted to reveal the performance of the new pier. It was found that it is feasible to construct a reinforced concrete pier that has stable hysteresis up to 4% drift without significant damage in the core concrete.

Journal

  • Doboku Gakkai Ronbunshu

    Doboku Gakkai Ronbunshu 703, 113-128, 2002-04-21

    Japan Society of Civil Engineers

References:  15

Cited by:  2

Codes

  • NII Article ID (NAID)
    10008219845
  • NII NACSIS-CAT ID (NCID)
    AN10014020
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    02897806
  • NDL Article ID
    6155483
  • NDL Source Classification
    ZN1(科学技術--建設工学・建設業)
  • NDL Call No.
    Z16-6
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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