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Deterioration Process and Evaluation of Strengthening Methods for Reinforced Concrete Bridge Deck

Research Project

Project/Area Number 09650505
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 土木材料・力学一般
Research InstitutionGifu University

Principal Investigator

KOYANAGI Wataru  Gifu University, Dept.of Civil Eng., Professor, 工学部, 教授 (30025928)

Co-Investigator(Kenkyū-buntansha) KURIHARA Norihiko  Musashi Institute of Technology, Dept.of Civil Eng., Associate, 工学部, 助手 (50262746)
UCHIDA Yuichi  Gifu University, Dept.of Civil Eng., Associate Professor, 工学部, 助教授 (20213449)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1998: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1997: ¥1,900,000 (Direct Cost: ¥1,900,000)
Keywordsreinforced concrete / bridge deck slab / punching shear / degradation / surface strengthening / bottom face strengthening / 押抜きせん断
Research Abstract

The heavier the traffic becomes, the more cases of damaged bridge deck slabs are reported year by year. It is basically important to clarify the mechanism of punching shear failure. In addition, various strengthening methods for damaged bridge deck slabs have been proposed and they can be divided into two. One is so-called surface strengthening method. SFRC surfacing and D-RAP method are included in this category. The other is so-called bottom surface strengthening method. In this case, steel plates or carbon-fiber sheets (CFRP) are glued on the lower face of slab by epoxy resin. Experimental studies were made to clarify the mechanism of punching shear failure and to evaluate the strengthening methods stated the above.
Principal conclusions derived are as follows ;
1) During loading tests, surface compression strain of slabs in radial direction near loading position increased at first and it turned to decrease fairly before punching shear failure occurred and even became tension at final stage, though strain in circumferential direction increased monotonously. The fact suggests that the changing of stress flow occurred in the internal structure of slab near loading position during loading.
2) Punching shear cracking spread abruptly irrespective to the existing bending cracks at final stage.
3) The effectiveness of surface strengthening method showed just as the same level as the slabs with same depth.
4) In case of bottom surface strengthening flexural rigidity increased largely. The increase is caused by the arresting effect of crack re-opening with the glued materials.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 小柳洽,内田裕市他: "RCスラブの押技きせん断破壊機構に関する基礎的研究" コンクリート工学年次論文報告集. 21予定. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Koyanagi, W., Uchida, Y.et.al.: "Studies on the Mechanism of Punching Shear Failiure" Proc.of the Japan Concrete Institute. V.21 (to be published). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 小柳洽, 内田裕市 他: "RCスラブの押抜きせん断破壊機構に関する基礎的研究" コンクリート工学年次論文報告集. 21巻(予定). (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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