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1991 Fiscal Year Final Research Report Summary

Study on Servceability Limit States of Reinforced Concrete Structure

Research Project

Project/Area Number 01460194
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Building structures/materials
Research InstitutionOsaka University

Principal Investigator

SUZUKI Kazuo  Osaka University Faculty of Engineering, Professor, 工学部, 教授 (60028991)

Co-Investigator(Kenkyū-buntansha) OHNO Yoshiteru  Osaka University Faculty of Engineering, Associate Professor, 工学部, 助教授 (30029194)
Project Period (FY) 1989 – 1990
KeywordsSustained loading / Repeated loading / deflection / cracking / creep / Shrinkage / Relaxation of Bond Stress / PRC
Research Abstract

1. Under Sustained Loading
(1) Relation between bond stress and slip of reinforcement in concrete under sustained loading was understood. (2) Additional deflection due to slip of reinforcement from anchor zone was larger than flexural deflection on cantilever beam. The slip of reinforcement could be predicted by use of proposed bond stress - slip model. (3) Delay of loading time after prestress transfer resulted in increase of long-term crack width and decrease of long-term deflections. (4) Crack width could be predicted by the proposed method. The ACI method for predicting deflections underestimated long-term deflections in beams.
2. Under Repeated Loading
Reinforced concrete beams and partially prestressed concrete beams were repeatedly loaded for 20 or 200000 cycles at two load levels which correspond to 1000 and 2000 kgf/cm^2 of steel stress. The results obtained were as follow : (1) Increase in crack width and deflections under repeated loading after 2 or 3 cycles was extremely little at the lower load level. At the higher load level, however, deformations increase linearly with number of cycle on a semi-loga scale. (2) Increase of deformation due to repeated load was caused by relaxation of bond stress and increase of compression strain of concrete.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 鈴木 計夫,大野 義照,白井 敏彦: "高強度鉄筋を用いてプレストレスを導入したPRCはりの持続荷重下における曲げ性状" 第12回コンクリ-ト工学年次講演会論文集. No.12. 173-178 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 鈴木 計夫,大野 義照,中川 隆夫,西永 雅一: "PRCはりの繰返しおよび持続荷重下における曲げ性状" 日本建築学会近畿支部研究報告集. 30. 25-28 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 鈴木 計夫,大野 義照,中川 隆夫,西永 雅一: "PRCはりの繰返し荷重下における曲げ性状" 日本建築学会大学学術講演梗概集. 7-8 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 鈴木 計夫,大野 義照,堀 裕弘,李 振宝: "持続荷重下における付着応力ーすべり関係と片持梁の長期たわみ" 日本建築学会近畿支部研究報告集. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 鈴木 計夫,大野 義照,堀 裕弘,李 振宝: "持続荷重下における付着応力ーすべり関係と片持梁の長期たわみ" 日本建築学会大学学術講演梗概集. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 鈴木 計夫,大野 義照,中川 隆夫,西永 雅一: "PRCはりの繰返しおよび持続荷重下における曲げ性状(その2 20万回の繰返しと2年間の持続載荷)" 日本建築学会大学学術講演梗概集. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Suzuki, Y. Ohno and T. Shirai: "Flexural Behavior of Concrete Beams Prestressed with High Strength Deformed Bars under Sustained Loading" Transactions of the Japan Concrete Institute. 12. 453-460 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Suzuki, Y. Ohno, T. Nakagawa and M. Nishinaga: "Flexural Behavior of Partially Prestressed Concrete Beams under Repeated Loading and Sustained Loading" Annual Report of Kinki Branch of Architectural Institute of Japan. 30. 25-28 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Suzuki, Y. Ohno, T. Nakagawa and M. Nishinaga: "Flexural Behavior of Partially Prestressed Concrete Beams under Repeated Loading" Summaries of Technical Papers of Annual Meeting of Architectural Institute of Japan. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Suzuki, Y. Ohno, Y. Hori and S. Ree: "Bond-Slip Relationships and Deflection of Cantilever Beams under Sustained Loading" Annual Report of Kinki Branch of Architectural Institute of Japan. 31. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Suzuki, Y. Ohno, Y. Hori and S. Ree: "Bond-Slip Relationships and Deflection of Cantilever Beams under Sustained Loading" Summaries of Technical Papers of Annual Meeting of Architectural Institute of Japan. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Suzuki, Y. Ohno, T. Nakagawa and M. Nishinaga: "Flexural Behavior of Partially Prestressed Concrete Beams under Repeated and Sustained Loading (Part. 2)" Summaries of Technical Papers of Annual Meeting of Architectural Institute of Japan. (1992)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-16  

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